Automotive Electrical Overvoltage Transient Suppressors Leaded - > ATH series Description Overvoltage transient suppressors are designed for applications requiring a low voltage rectifier with reverse avalanche characteristics for use as reverse power transient suppressors. Developed to suppress transients in the automotive system, these devices operate in reverse mode as power avalanche rectifier and will protect electronic equipment from overvoltage conditions Features Halogen-Free RoHS complaint Glass passivated junction for reliability Patented construction Suitable for standard ISO 7637-2 or ISO1675-2; Fasesponse time Applications Designed to protect sensitive electronics from: - Inductive Load Switching - Alternator Load Dump -GPS navigation systems Test background Excellent clamping capability Low incremental surge resistance Plastic package has Underwriters Laboratory Flammability classification 94V-O Matte Tin Lead-free plated This test is a simulation of load dump transient, occurring in the event of a discharged battery being disconnected while the alternator is generating charging current and with other loads remaining on the alternator circuit at this moment; the load dump amplitude depends on the alternator speed and on the level of the alternator field excitation at the moment the battery is disconnected. In most new alternators, the load dump amplitude is suppressed (clamped) by the addition of the limiting diodes. Maximum Ratings and Thermal Characteristics (T A =25 unless otherwise noted) Parameter Symbol Value Unit 1ms 4ms 12V system 87V.5Ω E typ. 8553 1ms 4ms 12V system 87V 1Ω 4277 1ms 35ms 24V system 174V 1Ω 14987 1ms 35ms 24V system 174V 2Ω 7493 ATH series 8 2μs waveform P PPM 15 ATH series1x1μs waveform 15 Operating Junction and Storage Temperature Range Typical Thermal Resistance Junction to lead Typical Thermal Resistance Junction to Ambient T J, T STG -5 to 15 R ujl 8. R uja 4 Note: 1*1μs peak pulse currenefer to electrical Characteristics table. Test parameters Parameter 12V system 24V system Us 65V to 87V 123V to 174V Ri.5Ω to 4Ω 1Ω to 8Ω td 4ms to 4ms 1ms to 35ms tr (1 5 ) ms Note Pulse waveform see figure 1, figure 2. J KW /W /W Revision:2-Mar-14
ISO 7637-2 24 5a Waveform Simulation Test 12V system 87V.5Ω 4mS original pulse waveform Overvoltage transient suppressors (ATH2C/ATH24C) Clamped pulse waveform ATH2C ATH24C 24V system 174V 2Ω 35mS original pulse waveform Overvoltage transient suppressors (ATH3C/ATH36C) Clamped pulse waveform ATH3C ATH36C Electrical Characteristics (T A =25 unless otherwise noted) Part Number (Bi) Reverse Reverse Maximum Peak Breakdown Voltage Test Stand-Off Leakage@ Clamping Pulse @I T Current Voltage V RWM Voltage @IPP Curren V BR MIN.(V) V BR MAX. (V) I T (ma) V RWM (V) I R (μa) Vc(V) Ipp(A) ATH16C 17. 2. 5. 16. 1. 28. 54 ATH2C 21. 25. 5. 2. 1. 34. 45 ATH24C 25. 3. 5. 24. 1. 4. 4 ATH3C 33. 38. 5. 3. 1. 51. 35 ATH36C 38. 45. 5. 36. 1. 59. 3 Part Number (Bi) Note: x representatives meets this test condition; Suitable ISO 7637-2 24 5a test waveform Maximum Voltage level Resistance Level Clamping Voltage Vc(V) 87V 4mS 174V 35mS.5Ω 1Ω 2Ω 4Ω 8Ω ATH16C 28. -- ATH2C 33. -- ATH24C 39. -- ATH3C 5. -- -- -- ATH36C 57. -- -- --
Ratings and Characteristic Curves (T A =25 unless otherwise noted) Figure 1. (Pulse 5a)without centralized load dump suppression Figure 2. (Pulse 5b)with centralized load dump suppression U U t d t d A unsuppressed.9u s.9u s B suppressed U A.1U s Us U A.1U s Us * Us t t Figure 3. Pulse Derating Curve Figure 4. Peak Pulse Power Rating Curve Peak Pulse Power (PPP) or Current (IPP) Derating in Percentage % 1 8 6 4 2 25 5 75 1 125 15 175 2 T A -Ambient Temperature () PPPM - Peak Pulse Power (kw) 1 1 1 1 15KW, 8/2µs Waveform.1 1 1 1 1 1 t d -Pulse Width (µs) Figure 5. I-V Curve Characteristics Figure 6. Pulse Waveform V C V BR V R I PP I T I R I R V R V BR V C I T V % of Peak Power Current 12 1 8 6 4 2 Peak value Ipp t d =t PP /2 Waveform Parameters: =8µs t d =2µs I PP 5 1 15 2 t-time (μs) 25 3
Soldering Parameters Reflow Condition Pre Heat - Temperature Min(T s(min)) 15 - Temperature Max(T s(max)) 2 Lead-free assembly - Time (min to max) (t s) 6~18 seconds Average ramp up rate (Liquidus Temp (T L) to peak T s(max) to T L - Ramp-up Rate Reflow - Temperature (T L) (Liquidus) 217 3/second max 3/second max - Time (min to max) (t s) 6~15 seconds Peak Temperature (T P) 26 +/-5 Time within 5 of actual peak Temperature (t P) Ramp-down Rate Time 25 to peak Temperature (T P) Do not exceed 28 2~4 seconds 6/second max 8 minutes Max. TP TL Ts(max) Ts(min) 25 ts Preheat t 25 to Peak Ramp-up Time (t) Flow/Wave Soldering (Solder Dipping) Peak Temperature: 265 Dipping Time: Soldering: 1 seconds 1 time tp tl Critical Zone TL to TP Ramp-down Dimensions H D T ATH Series Millimeters Inches Items Min. Max. Min. Max. D - 13. -.512 H - 15.5. -.61 K 3.5 T 6..23 d L L 1..393 K 3..118 F F 7.5±.8.3±.33 d.8±.1.314±.4
Part Numbering Systern ATH XX C TYPE CODE: A Uni-Directional C Bi-Directional VOLTAGE CODE (Refer to the Electrical Characteristics table) SERIES CODE Part Marking Systern YXXX ATH24C Logo Date Code Marking Code Packaging ATH series Bulk 65 Max. 185 Max. 2pcs/box 245 Max. Note: We will always keep the technical specification updates, to customers provide with better products