www.TriadMagnetics.com

Audio Transformers

M il-T-27E

Power

Max. Ma DC

Overall

Type

Mil Type

Level

Matching Impedance

Unbalanced

DC Resistance

Turns

Figure

Section

No.

No.

in mW

Primary

Secondary

in Primary

Primary

Secondary

Ratio

No.

A

SP-4

TF5S21ZZ

10

200,000 CT

1,000 CT

0.0

5,300.0

100.0

14.1:1.0

3

B

SP-5

TF5S21ZZ

25

50,000 CT

1,000 CT

0.0

3,800.0

75.0

7.1:1.0

3

C

SP-13

TF5S21ZZ

40

25,000 CT/20,000 CT

1,000/800 CT

0.5

1,700.0

115.0

5.0:1.0

3

SP-20

TF5S21ZZ

50

10,000 CT

1,200 CT

1.0

1,050.0

200.0

2.88:1.0

3

SP-21

TF5S21ZZ

50

10,000 CT

2,000 CT

1.0

1,050.0

330.0

2.24:1.0

3

SP-22

TF5S21ZZ

50

10,000

2,000 CT/500§

1.0

1,050.0

146.0/168.0§

4.48:1.0:1.0

4

SP-29

TF5S21ZZ

50

10,000 CT

500 CT

1.0

1,050.0

80.0

4:47:1.0

3

SP-33

TF5S21ZZ

50

1,000

50

3.0

145.0

8.0

4.4:1.0

1

SP-42

TF5S21ZZ

50

150 CT

12

10.0

18.0

2.7

3.54:1.0

2

D

SP-48

TF5S21ZZ

50

7,500 CT

12

1.0

796.0

2.9

25.0:1.0

2

SP-49

TF5S21ZZ

50

300 CT

600

7.0

41.0

98.0

1.0:1.42

2

SP-50

TF5S21ZZ

50

500 CT

600

3.0

67.0

98.0

1.0:1.1

2

SP-51

TF5S21ZZ

50

900 CT

600

4.0

104.0

96.0

1.22:1.0

2

SP-52

TF5S21ZZ

50

1,500 CT

600

3.0

168.0

92.0

1.58:1.0

2

SP-66

TF5S21ZZ

50

10,000 CT

10,000 CT

1.0

1,000.0

1,300.0

1.0:1.0

3

SP-67

TF5S21ZZ

50

600 CT

600 CT

3.0

72.0

92.0

1.0:1.0

3

SP-68

TF5S21ZZ

50

10,000

10,000 CT/2,500§

1.0

1,000.0

565.0/650.0§

2.1:1.0

4

SP-69

TF5S21ZZ

50

600

600 CT/150§

3.0

72.0

40.0/45.0§

2.0:1.0:1.0

4

SP-70

TF5S21ZZ

50

600

600

3.0

72.0

92.0

1.0:1.0

1

E

SP-128

TF5S21ZZ

•

0.1H

•

5.0

15.0

••

5

SP-310

Shield Only

CT = Center Tap

§ Split secondary

T echnical Notes

1. Plug-in terminals are precision spaced to provide

fixed mounting centers.

Triad high reliability audio transformers provide the durability and precision required in today’s

demanding designs. These transformers are available for a wide variety of applications. The line

of Red Spec audio transformers is designed and constructed to meet the rigid requirements of

MIL-T-27E. These transformers feature an epoxy molded case, gold plated leads and exceptional

operation from 300 Hz to 100 kHz.

Frequency Response Ranges: 300 Hz to 100 kHz

Red Spec

(M iL-T-27E)

F igur e 1

F igur e 2

F igur e 3

F igur e 4

F igur e 5

4. Red Spec transformers feature small footprint

base dimensions of .310 by .410 inch.

5. Pin diameter = .020 inch.

2. Red Spec transformers are hi-pot tested at 1,000 VRMS.

3. 150 VDC working voltage.

CT Primary

Tap Primary - Tap Secondary

Split Windings

Inductor