DEFENSE LOGISTICS AGENCY LAND AND MARITIME P.O. BOX 3990 COLUMBUS, OHIO

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1 DEFENSE LOGISTICS AGENCY LAND AND MARITIME P.O. BOX 990 COLUMBUS, OHIO January 0, 207 MEMORANDUM FOR MILITARY/INDUSTRY DISTRIBUTION SUBJECT: Initial Draft of Amendment, MIL-PRF-27/205D Amendment, MIL-PRF-27/240C Amendment, MIL-PRF-27/24B Amendment, MIL-PRF-27/286C Amendment, MIL-PRF-27/290C Amendment ; Project Numbers , -05, -06, -07, , The proposed initial drafts are being amended to add a dimension table to Figure instead of dimensions on the figures. This change will help to expedite further document actions. The initial drafts for the subject documents, dated 0 January 207, are now available for viewing and downloading from the DLA Land and Maritime-VA Web site: Concurrence or comments are required at this Center within 0 days from the date of this letter. Late comments will be held for the next coordination of the document. Any further coordination concerning these documents will be circulated only to firms and organizations that furnish comments or reply that they have an interest. Comments from military departments must be identified as either "Essential" or "Suggested". Essential comments must be justified with supporting data. Military review activities should forward comments to their custodians of this office, as applicable, in sufficient time to allow for consolidating the department reply The point of contact for this document is Mr. Ken Beymer, DLA Land and Maritime, VAT, Post Office Box 990, Columbus, OH Mr. Beymer can also be reached at / , or by facsimile / , or by to: ken.beymer@dla.mil MICHAEL A. RADECKI Chief Electronics Component Team

2 NOTE: This draft dated, 0 January 207, prepared by DLA-CC has not been approved and is subject to modification. DO NOT USE FOR ACQUISITION PURPOSES. INCH-POUND DRAFT SUPERSEDING MIL-PRF-27/72D 22 April 20 PERFORMANCE SPECIFICATION SHEET TRANSFORMERS, AUDIO FREQUENCY, MICRO-MINIATURE This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the products described herein shall consist of this specification and MIL-PRF-27. NOTES:. Dimensions are in inches. 2. Metric equivalents are given for general information only.. Marking shall be on the side of the case. 4. Primary and secondary electrical values shall be marked as specified in table I, as applicable. FIGURE. Dimensions and configurations. AMSC N/A FSC 5950

3 Dim Inches mm A.469 MAX..9 MAX. B.44 DIA MAX DIA MAX. C.50 ± ±6.4 D.00 MAX MAX. E AWG NO.26 (.0) FIGURE. Dimensions and configurations continued. REQUIREMENTS: (When colors is parentheses, i.e., are used, they indicate the winding and the extreme terminals of the winding. When the extreme terminals of two windings are used, i.e. (Grn-Yel), the windings are connected in series.) Electrical ratings: See table I. Working voltage (peak): 50 V. Frequency range: 00 Hz to 00 khz. Design and construction: Dimensions and configurations: See figure. Duty cycle: Continuous. Terminals: Solid wire, insulated. Insulation shall not be polyvinyl chloride. Composition: D in accordance with MIL-STD-276. Diameter: 0.0 inch. Length:.50 inches ±0.25. Final finish: Tinned. Weight: 4.50 grams, maximum. Altitude: 50,000 feet, maximum. Operating temperature range: -55 C to +05 C Terminal strength: MIL-STD-202-2, test condition A, 2.0 pounds. Vibration (high frequency): MIL-STD , test condition B. Dielectric withstanding voltage: At sea level: 00 V rms. At barometric pressure: 00 V rms. 2

4 Electrical characteristics: See table II. No load (center tap unbalance): ± percent at V, 5 khz across the primary. Harmonic distortion: Total harmonic content of the output shall be a maximum of 5 percent at the specified power level and primary dc current (see table I) at khz to 00 khz. Insertion loss: At the specified power level (see table I), the insertion loss shall be a maximum of.0 db at khz. Frequency response: ± db at the rated source and load impedances (see table II) with.0 mw level output and a reference frequency of khz. Self-resonant frequency: Measured with secondaries carrying specified loads, with the secondary voltage observed (see table II).. Marking location: See figure.

5 TABLE I. Electrical ratings. / 2/ Primary Secondary / Primary Primary Secondary Power level impedance impedance dc current dc dc Dash Circuit at khz resistance resistance no. diagram (max) (ma) 4/ ±25% ±25% (mw) 0 G 80 CT 2 SPLIT CT 40 SPLIT 0 02 D 20 CT CT 0 0 D 50 CT CT 0 04 D 00 CT D 00 CT D 20 CT 07 G 08 G 09 G 0 E A SPLIT SPLIT 6 20 SPLIT SPLIT SPLIT SPLIT 6 4,000 CT 5,000 CT (Blu Red) 60 2 D A 600 (Blu Red) 4 D 600 CT CT 5 5 D 640 CT CT 5 D 800 CT ,000 CT 4 7 D 800 CT ,070 CT 4 8 D 900 CT A,000 (Blu ,200 Red) 60 See footnotes at end of table I. 4

6 TABLE I. Electrical ratings. / 2/ - Continued. Dash no. Circuit diagram 20 G 2 D 22 D 2 A 24 D Primary Secondary / Primary Primary Secondary Power level impedance impedance dc current dc dc at khz resistance resistance (max) (ma) 4/ ±25% ±25% (mw),000 CT,000 SPLIT ,200 CT 20,000 SPLIT.5,000 CT ,0 CT.5,060 CT ,0 CT.5,200 (Blu Red), ,000 CT 25 D, D,600 CT ,000 CT 27 G 2,000 CT 2,000 SPLIT , 2,500 SPLIT 28 G 2,000 CT 8,000 SPLIT , 0,000 SPLIT 29 D 7, D 8,000 CT A 0,000 (Blu Red) 2 C 0,000 (Blu ,000 Red) 600 CT C 0,000 (Blu-,200 CT ,500 Red), 25 4 E, ,000 CT,800 CT 25 5 G 2,000 SPLIT ,000 CT 2,400 SPLIT 6 C 0,000 (Blu- 2,000 CT ,500 Red) 2, 7 E ,75 2,000 CT 2,000 CT 25 8 A 20,000 (Blu ,000 Red), E 20,000 CT 800 CT ,000 CT,200 CT G 20,000 CT,000 SPLIT ,000 CT,500 SPLIT G 40,000 CT 400 SPLIT , ,000 CT 500 SPLIT 0.25 See footnotes at end of table I. 5

7 TABLE I. Electrical ratings. / 2/ - Continued. Primary Secondary / Primary Primary Secondary Power level impedance impedance dc current dc dc Dash Circuit at khz resistance resistance no. diagram (max) (ma) 4/ ±25% ±25% (mw) 42 E 40,000 CT 4,000 CT , ,000 CT 5,000 CT B 200,00, , F 200,000 CT,000 CT , E 600 CT 600 CT / H 4,000 CT 5,000 CT 8,000 CT / H 8,000 CT,200 CT, / H 9,000 CT 9,000 CT , / I 00,000 CT , / I 200,000 CT,000 CT , / Qualification testing and approval to M27/72-49 or M27/72-44 shall be sufficient to grant qualification approval to M27/72-0 through M27/ / Impedance values written one above the other indicates a range of matching impedances over which the parts will give satisfactory performance as long as the impedance ratio is maintained. / Where windings are listed as SPLIT, one-fourth of the listed impedance is available by paralleling the winding. 4/ Primary dc current shall be the maximum single-ended current for which the transformer will meet the specified performance requirements. For push-pull, ma dc can be any balanced value taken by.5 W transistors. 5/ Includes electrostatic shield. Shield terminal shall be white. Voltage ratio shall be 2 to at 20 khz. 6

8 TABLE II. Electrical characteristics. Dash no Frequency response: ± db / at 00 Hz to 00 khz and mw Z S 80 CT 20 CT 50 CT 00 CT 00 CT 20 CT CT 640 CT 800 CT 800 CT 900 CT,000,000 CT,000 CT,060 CT Z L ,000 CT , Resonance, self resonant frequency (min) (khz) Polarity: Additive with terminals (below) connected,500 Blu and Yel, and,000 Blu and Blk 750 Blu and Yel 750 Red and Blk 750 Red and Blk 750 Red and Blk See footnote at end of table II. 7

9 TABLE II. Electrical characteristics - Continued. Dash no Frequency response: ± db / at 00 Hz to 00 khz and mw Z S,200, 50 CT,600 CT 2,000 CT 2,000 CT 7, 8,000 CT 0,000 0,000 0,000 0,000 20,000 20,000 CT 20,000 CT 40,000 CT 40,000 CT 200, ,000 CT Z L ,000 8, ,200 CT, 2,000 2,000 CT CT, ,000,000,000 CT Resonance, self resonant frequency (min) (khz) Polarity: Additive with terminals (below) connected 750 Red and Blk 750 Red and Blk 750 Red and Yel 750 Red and Yel 750 Blu and Yel 750 Red and Yel 500 Blu and Yel 750 Red and Blk 750 Blu and Yel 500 Blu and Yel, and 500 Blu and Yel 00 Grn and Blu 00 Blu and Yel See footnote at end of table II. 8

10 TABLE II. Electrical characteristics - Continued. Dash no Frequency response: ± db / at 00 Hz to 00 khz and mw Z S 600 CT 4,000 CT 8,000 CT 9,000 CT 00,000 CT 200,000 CT Z L 8,000 CT,200 CT 9,000 CT,000 CT Resonance, self resonant frequency (min) (khz) Polarity: Additive with terminals (below) connected 00 Blu and Yel 500 Blu and Yel 500 Blu and Yel 500 Blu and Yel 00 Blu and Yel 00 Grn and Brn / Frequency response shall be within ± db at 00 Hz to 20 khz and ±4 db at 00 Hz to 00 khz at mw for dash numbers 4, 44, 49, and 50. Part or Identifying Number (PIN): M27/72-(dash number from table I). SUPERSESSION DATA: MIL-PRF-27/72 supersedes the following MS sheets which have been cancelled: MS275 MS2407 MS24 MS277 MS2408 MS242 MS29 MS2409 MS24 MS2406 MS240 MS242 MS5228 9

11 MIL-PRF-27/72 supersedes MIL-PRF-27/28 and MIL-PRF-27/44. Supersession data are as follows: MIL-PRF-27/72 PIN M27/72-46 M27/72-47 M27/72-48 M27/72-49 M27/72-50 M27/72-0 M27/72-05 M27/72-07 M27/72-09 M27/72-0 M27/72- M27/72-2 M27/72-45 M27/72-8 M27/72-9 M27/72-2 M27/72-25 M27/72-27 M27/72-28 M27/72-2 M27/72- M27/72-4 M27/72-5 M27/72-6 M27/72-7 M27/72-8 M27/72-9 Superseded PIN M27/28-0 M27/28-02 M27/28-0 M27/28-04 M27/28-05 M27/44-0 M27/44-02 M27/44-0 M27/44-04 M27/44-05 M27/44-06 M27/44-07 M27/44-08 M27/44-09 M27/44-0 M27/44- M27/44-2 M27/44- M27/44-4 M27/44-5 M27/44- M27/44-7 M27/44-8 M27/44-9 M27/44-20 M27/44-2 M27/

12 Amendment notations. The margins of this specification are marked with vertical lines to indicate modifications generated by this amendment. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations. Referenced documents. In addition to MIL-PRF-27, this document references the following: MIL-STD , MIL-STD-202-2, MIL-STD-276 Custodians: Preparing activity: Army CR DLA CC Navy EC Air Force 85 (Project ) DLA - CC Review activities: Army AR, CR4 Navy AS, MC, OS Air Force 9, 99 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of this information above using the ASSIST Online database at