Hardware Description and Design-In Proposals for Single and Dual SMD Transmissive Sensors

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Bethany Martin
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1 VISHAY SMICONDUCTORS Optical Senor By Reinhard Schaar TCPT3X (SINGL), TCUT3X (DUAL) TCPT35X (SINGL), TCUT35X (DUAL) AC-Q qualified Tranmiive enor for automotive and indutrial application Gap dimenion: 3 mm and aperture width:.3 mm Typical output current under tet: I C = ma at = 5 ma mitter wavelength: 95 nm Moiture enitivity level (MSL): unlimited floor life Halogen-free Compatible with infrared reflow, vapor phae, and wave older procee according to CCC 82 and JDC STD-2C AC-Q qualified Tranmiive enor for automotive and indutrial application Gap dimenion: 3 mm and aperture width:.3 mm Typical output current under tet: I C =.6 ma at = 5 ma mitter wavelength: 95 nm Moiture enitivity level (MSL): unlimited floor life Halogen-free Releaed for high operating temperature up to 25 C Compatible with infrared reflow, vapor phae, and wave older procee according to CCC 82 and JDC STD-2C TCPT6X (SINGL), TCUT6X (DUAL) AC-Q qualified Tranmiive enor for automotive and indutrial application Gap dimenion: 3 mm and aperture width:.3 mm Typical output current under tet: I C =.6 ma at = 5 ma mitter wavelength: 95 nm Moiture enitivity level (MSL): unlimited floor life Halogen-free Taller dome, more vertical headroom Compatible with infrared reflow, vapor phae, and wave older procee according to CCC 82 and JDC STD-2C Reviion: 6-Sep-28 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

2 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Gap (in mm): 3 Coll. Pin connection top view Cath. A Aperture (in mm):.3.2 B.3 ±.5 B Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement Reviion: 6-Sep-28 2 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

3 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B.3 ±.5 B. Here (in mm): = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With = -.5 mm, nearly all emitted IR light i alo available at the detector ide. Reviion: 6-Sep-28 3 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

4 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B.3 ±.5 B. Here (in mm): = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With = mm, nearly half of emitted IR light i blocked, but half of IR light i alo available at the detector ide. Reviion: 6-Sep-28 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

5 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B.3 ±.5 B. Here (in mm): = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With = +.5 mm, nearly all emitted IR light i blocked and nearly nothing i available at the detector ide. Reviion: 6-Sep-28 5 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

6 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Tranmiive Senor: TCUT3.X Gap (in mm): 3 Pin connection top view Cath. Coll. A Aperture (in mm):.3.2 B ±.5.3 ±.5 B Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement Ditance between lot for detector (D ) and detector 2 (D 2 ) i.5 mm. Reviion: 6-Sep-28 6 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

7 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Tranmiive Senor: TCUT3.X Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B ±.5.3 ±.5 B. Here (in mm): = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With = -.5 mm, nearly all emitted IR light i alo available at both detector ide D and D 2 : U D =, U D2 = Reviion: 6-Sep-28 7 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

8 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Tranmiive Senor: TCUT3.X Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B ±.5.3 ±.5 B. Here (in mm): = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With =. mm, nearly half of emitted IR light i blocked (for D ), but half of IR light i alo available at D and all IR light i available at D 2. Reviion: 6-Sep-28 8 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

9 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Tranmiive Senor: TCUT3.X Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B ±.5.3 ±.5 B. Here (in mm): = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With = +.5 mm, nearly all IR light i blocked (for D ), but all IR light till available at D 2 : U D =, U D2 = Reviion: 6-Sep-28 9 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

10 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Tranmiive Senor: TCUT3.X Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B ±.5.3 ±.5 B Here (in mm): = +.5. Here (in mm): 2 = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With 2 = -.5 mm, nearly all emitted IR light i available at D 2. Reviion: 6-Sep-28 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

11 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Tranmiive Senor: TCUT3.X Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B ±.5.3 ±.5 B. Here (in mm): 2 = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With 2 =. mm, nearly half of emitted IR light i blocked for D 2. Reviion: 6-Sep-28 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

12 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Tranmiive Senor: TCUT3.X Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B ±.5.3 ±.5 B. Here (in mm): 2 = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With 2 = +.5 mm, nearly all emitted IR light i now alo blocked for D 2 : U D =, U D2 = Reviion: 6-Sep-28 2 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

13 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT Tranmiive Senor: TCUT3.X Pin connection top view Coll. Cath. A Aperture (in mm):.3.2 B ±.5.3 ±.5 B. Here (in mm): 2 = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With 2 = +. mm, all emitted IR light i now alo blocked for D 2 : U D =, U D2 = Reviion: 6-Sep-28 3 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

14 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT. ±.5.3 ±.5.5 For =.5 (in mm): = Horizontal Diplacement (mm) Relative Collector Current v. Horizontal Diplacement With = ±.5 mm for cloe to % / % of the collector current, jut ±.35 mm i een a added overlapping that need to be added to that. mm total width. So,. mm + 2 x.35 mm =.8 mm for the total cloing / opening. Reviion: 6-Sep-28 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

15 RLATIV COLLCTOR CURRNT VS. HORIZONTAL DISPLACMNT.8 mm. mm mm With a.8 mm hole,.8 mm gap / balk, and a contant hift of.9 mm, all four poition will be covered well. With 6 hole and balk = 6 x 3.6 mm = 23. mm. A code wheel diameter will have with thi: d 73 mm. Smaller wheel are alo poible, but the exact high and low level will not be reached. With mm hole,.5 mm gap / balk, and with 6 hole and balk it could be jut about 22 mm, and with jut 6 poition (6 x. mm/) = 5.6 mm diameter. Reviion: 6-Sep-28 5 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

16 DTRMINING TH FORWARD CURRNT FOR TH IRD AND TH LOAD RSISTOR FOR TH PHOTOTRANSISTOR Firt of all, one need to alo ee the minimum pecified and guaranteed value within baic characteritic of the dataheet: BASIC CHARACTRISTICS (T amb = 25 C, unle otherwie pecified) TCUT3X, TCPT3X PARAMTR TST CONDITION SYMBOL MIN. TYP. MAX. UNIT COUPLR Collector current V C = 5 V, = 5 ma I C.3 - ma The TCUT3X and TCPT3X how here.3 ma (with an = 5 ma), while the TCUT35X, TCPT35X, TCUT6X, and TCPT6X how.7 ma: BASIC CHARACTRISTICS (T amb = 25 C, unle otherwie pecified) TCUT35X, TCPT35X, TCUT6X, TCPT6X PARAMTR TST CONDITION SYMBOL MIN. TYP. MAX. UNIT COUPLR Collector current V C = 5 V, = 5 ma I C ma TCUT3X, TCPT3X TCUT35X, TCPT35X, TCUT6X, TCPT6X I C - Collector Current (ma).3.. V C = 5 V I C - Collector Current (ma).6.7. V C = 5 V.. - Forward Current (ma) Fig. - Collector Current v. Forward Current Fig. 2 - Collector Current v. Forward Current Reviion: 6-Sep-28 6 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT - Forward Current (ma)

17 DTRMINING TH FORWARD CURRNT FOR TH IRD AND TH LOAD RSISTOR FOR TH PHOTOTRANSISTOR Beide thee tolerance, one alo need to ee the typical temperature behavior: TCUT3X, TCPT3X TCUT35X, TCPT35X, TCUT6X, TCPT6X I C - Collector Current (ma) V C = 5 V = 5 ma = 5 ma I C - Collector Current (ma) V C = 5 V = 5 ma = 5 ma T amb - Ambient Temperature ( C) T amb - Ambient Temperature ( C) Fig. 3 - Collector Current v. Ambient Temperature Fig. - Collector Current v. Ambient Temperature The TCUT3X and TCPT3X how for - C an I C of.5 ma. 5 ma i typical for 25 C, o thi value i about 3 % le. For pecified minimum current it would then be jut.3 ma - 3 % =.2 ma. For the TCUT35X, TCPT35X, TCUT6X, and TCPT6X thi i different. Here for - C an I C of ma i een..6 ma i typically een for 25 C, o thi value i about % le. Calculating here alo with minimum pecified data, it will lead to.7 ma - % =.2 ma. Reviion: 6-Sep-28 7 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

18 DTRMINING TH FORWARD CURRNT FOR TH IRD AND TH LOAD RSISTOR FOR TH PHOTOTRANSISTOR The degradation of the IRD alo need to be een. Dealing here with about 5 % will be ufficient for a normal operation profile over the whole lifetime of > 2 year. A typical circuit will look like the example below. The reitor defining the forward current would then be: R = (5 V -.2 V)/5 ma = 253. A bit lower normed value will be: 2. 5 V 5 V C R 2 Ω nf U F U F =.2 V U O = 5 ma R L The load reitor value i now dependant on the wanted and needed output voltage. If it need to deliver a high level to fulfill the input condition of the following circuitry, e.g. U O.6 V, it would need to be quite high-ohmic. With having all tolerance in mind, one hould jut calculate with.2 ma (for the TCUT3X and TCPT3X) and with ma for the TCUT35X, TCPT35X, TCUT6X, and TCPT6X. Thi lead to a load reitor value of:.6 V/.2 ma = 23 k, o, a R L 2 k hould be ued for the TCUT3X and TCPT3X and.6 V/ ma = k for the TCUT35X, TCPT35X, TCUT6X, and TCPT6X. Reviion: 6-Sep-28 8 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

19 TIM-CRITICAL APPLICATIONS To uppre poible ambient ditortion and alo improve witching time, it would be wie to chooe for the load reitor a value a low a poible. Output voltage of even le than V will be enough for either a following A/D input or a imple tranitor behind. So, R L could be about: R L = V/.2 ma = 5 k (for the TCUT3X and TCPT3X) and R L = V/ ma = 2.2 k (for the TCUT35X, TCPT35X, TCUT6X, and TCPT6X) 5 V 5 V C R 2 Ω nf U F U F =.2 V = 5 ma R L U O Reviion: 6-Sep-28 9 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

20 TIM-CRITICAL APPLICATIONS The TCUT3X and TCPT3X how a typical rie / fall time of 2 μ / 3 μ: SWITCHING CHARACTRISTICS PARAMTR TST CONDITION SYMBOL MIN. TYP. MAX. UNIT Rie time Fall time I C =.3 ma, V C = 5 V, R L = (ee Fig. 6) I C =.3 ma, V C = 5 V, R L = (ee Fig. 6) t r μ t f μ The TCUT35X, TCPT35X, TCUT6X, and TCPT6X are pecified with lower timing: SWITCHING CHARACTRISTICS PARAMTR TST CONDITION SYMBOL MIN. TYP. MAX. UNIT Rie time Fall time I C =.7 ma, V C = 5 V, R L = (ee Fig. 6) I C =.7 ma, V C = 5 V, R L = (ee Fig. 6) t r μ t f μ For all device thi i valid only with the tet circuit hown, typical collector current, and at T amb = 25 C. R G = 5 Ω t p T = 2 t p = m Ω Ω + 5 V I C adjuted by Channel I Ocillocope R Channel II L MΩ C L 2 pf t r / t f - Rie / Fall Time (µ) R L = Ω 6 5 t f 3 t r I C - Collector Current (µa) Fig. 5 - Tet Circuit for t r and t f Fig. 6 - Rie / Fall Time v. Collector Current For higher load reitor = lower collector current, ignificantly higher timing will be een, a alo indicated within Fig. 6. Reviion: 6-Sep-28 2 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

21 TIM-CRITICAL APPLICATIONS For higher temperature thee timing will alo increae. For a quite low load reitor of jut k, pecified typical value of 2 μ / 3 μ will alo at 25 C how already 27 μ / 3 μ, but for T amb = 8 C thee may be a high a 38 μ (t r ) and 65 μ (t f ) fall t r / t r - Rie / Fall Time (μ) Comment: average: 25 device, 2 channel collector current I C = 3 μa collector-emitter voltage V C = 5 V load reitance per channel R L = kω pule condition t pule = m, t pule /T period = T amb - Ambient Temperature ( C) rie Fig. 7 - Rie / Fall Time v. Ambient Temperature With a load reitor of 22 k the ON time will not increae that much, but the OFF time i ten time higher to about 27 μ, and thi i already at T amb = 25 C. With 7 k, again about a factor of three for fall time will be een, o, about 8 μ. For an operation temperature of 85 C thi will increae then to about m, and for lower collector current either due to a device coming with a pecified minimum value or operating with lower forward current, thi may again be doubled. Reviion: 6-Sep-28 2 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

22 OPRATING WITH LOW FORWARD CURRNTS Some application may need to deign the circuitry for the lowet-poible current conumption. All IR emitter diode hould work with a defined minimum forward current to deliver table optical output. For the reflective enor it hould be 3 ma. For lower emitter current the typical CTR may alo be different and the provided graph (I C v. ) may how different behavior. So, it i not poible to aume that a parallel line within the I C v. graph could how the correct collector current. TCUT3X, TCPT3X TCUT35X, TCPT35X, TCUT6X, TCPT6X I C - Collector Current (ma).3.. Typ.: 6 µa at = 5 ma? Min.: 3 µa at = 5 ma I C - Collector Current (ma).6.7. Typ.:.6 ma at = 5 ma? Min.:.7 ma at = 5 ma V C = 5 V Forward Current (ma). 5 - Forward Current (ma) Fig. 8 - Collector Current v. Forward Current Fig. 9 - Collector Current v. Forward Current Reviion: 6-Sep Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

23 AMBINT LIGHT DISTURBAS The enor may alo be ued under critical light condition. Some daylight or other light ource may be around and could affect the phototranitor, a thi i not equipped with any filter. Due to contruction requirement it i not poible to have a kind of daylight filter added here. A wide bandwidth will alo allow for poible ambient light ditortion. The pectral bandwidth curve will look imilar to the graph below (ame phototranitor chip): S (λ) rel - Relative Spectral Senitivity λ - Wavelength (nm) Fig. - Relative Spectral Senitivity v. Wavelength BASIC CHARACTRISTICS (T amb = 25 C, unle otherwie pecified) PARAMTR TST CONDITION SYMBOL MIN. TYP. MAX. UNIT Wavelength of peak enitivity p nm Range of pectral bandwidth. - to 7 - nm Reviion: 6-Sep Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

24 AMBINT LIGHT DISTURBAS Light with wavelength higher than 5 nm will diturb the TCUT3X, TCPT3X, TCUT35X, and TCPT35X, according to Fig. 3. ven red LD ditributing light at about 63 nm. White LD how a wide wavelength range - beide a blue peak at about 5 nm - mainly at 52 nm to 63 nm. Relative pectral enitivity of the photodetector ued within the TCUT3X, TCPT3X, TCUT35X, and TCPT35X will recognize thi with about % to 5 % of it main enitivity..2.2 I rel - Relative Intenity uper red λ - Wavelength (nm) I rel - Relative Luminou Intenity λ - Wavelength (nm) Fig. - Relative Intenity v. Wavelength (uper red) Fig. 2 - Relative Intenity v. Wavelength Fig. 3 - Relative Spectral Senitivity v. Wavelength Reviion: 6-Sep-28 2 Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT S (λ) rel - Relative Spectral Senitivity λ - Wavelength (nm)

25 AMBINT LIGHT DISTURBAS Very cloely poitioned red (or even white) LD could diturb the TCUT / TCPT detector, becaue all LD / IRD end out light to all ide and there i no filter within the TCUT / TCPT. Directing the LD traight to the TCUT / TCPT detector hould be avoided. D D One poible improvement could be to turn the TCUT / TCPT around. That would avoid the poibility that the LD reach the photodetector() (D) directly. Too wide lot of the code wheel for the TCUT / TCPT detector hould be avoided. An improvement could be with a reduced width of the opening / lot. That would avoid the poibility that the LD reach the photodetector() (D) directly. Alo, a quite high forward current for the TCUT / TCPT emitter and a low load reitor value at the detector ide would help to reduce enitivity to tray light. Reviion: 6-Sep Document Number: 8873 AR SUBJCT TO SPCIFIC DISCLAIMRS, ST FORTH AT

Tall Dome Dual Channel Transmissive Optical Sensor with Phototransistor Outputs

TCUT6X Tall Dome Dual Channel Transmissive Optical Sensor with Phototransistor Outputs DESCRIPTION The TCUT6X is a compact transmissive sensor that includes an infrared emitter and two phototransistor