MIL-STD-1553 Multiplex Data Bus Transformer

Pico Electronics offers two series of MIL-STD-1553 compliant transformers designed for aerospace and military applications. The 65000 series provides a surface mount alternative to traditional through-hole MIL-PRF-21038/27 data-bus transformers, featuring gull wing terminals for easier PCB assembly. Meanwhile, the LL-68500 series, available in both through-hole (TH) and surface mount (SM) versions, focuses on minimizing leakage inductance and DC resistance. Both series ensure reliable data transmission and electrical isolation, with the LL-68500 series specifically engineered for transparent signal processing and minimal distortion. These transformers exemplify Pico’s commitment to providing compact, high-performance solutions for MIL-STD-1553 interface requirements in critical aerospace and military systems.

For more information on our qualified military products, or QPL data-bus transformers, please visit our separate page for MIL-spec partsOpens a new window.

Mounting

Turns Ratio

Impedance Ω (Min.)

Part Number SeriesMountingTurns Ratio (±3%)Primary TerminalsSecondary TerminalsDC Resistance Ω (max.)Impedance Ω (Min.)Typ. Leakage Inductance (μH)Size (L x W x H) inchesDownloads
LL-68585-THLL-68500-THThrough Hole1.41:1
2:1
1-34-8
5-7
(1-3) 2.07
(4-8) 0.98
3000(1-3)
4.5
0.40 x 0.40 x 0.28
LL-68585-SMLL-68500-SMSurface Mount1.41:1
2:1
1-34-8
5-7
(1-3) 2.07
(4-8) 0.98
3000(1-3)
4.5
0.40 x 0.40 x 0.28
LL-68580-THLL-68500-THThrough Hole2.12:1
1.5:1
4-8
5-7
1-3(1-3) 0.81
(4-8) 2.82
3000(4-8)
10.2
0.40 x 0.40 x 0.28
LL-68580-SMLL-68500-SMSurface Mount2.12:1
1.5:1
4-8
5-7
1-3(1-3) 0.81
(4-8) 2.82
3000(4-8)
10.2
0.40 x 0.40 x 0.28
LL-68575-THLL-68500-THThrough Hole1:2.5
1:1.79
1-34-8
5-7
(1-3) 0.72
(4-8) 2.75
3000(4-8)
4.2
0.40 x 0.40 x 0.28
LL-68575-SMLL-68500-SMSurface Mount1:2.5
1:1.79
1-34-8
5-7
(1-3) 0.72
(4-8) 2.75
3000(4-8)
4.2
0.40 x 0.40 x 0.28
LL-68570-THLL-68500-THThrough Hole1:1
1:0.707
1-34-8
5-7
(1-3) 2.07
(4-8) 1.32
3000(4-8)
4.2
0.40 x 0.40 x 0.28
LL-68570-SMLL-68500-SMSurface Mount1:1
1:0.707
1-34-8
5-7
(1-3) 2.07
(4-8) 1.32
3000(4-8)
4.2
0.40 x 0.40 x 0.28
LL-68565-THLL-68500-THThrough Hole1:2.51-34-6(1-3) 0.50
(4-6) 2.10
3000(4-6)
5.2
0.40 x 0.40 x 0.28
LL-68565-SMLL-68500-SMSurface Mount1:2.51-34-6(1-3) 0.50
(4-6) 2.10
3000(4-6)
5.2
0.40 x 0.40 x 0.28
LL-68560-THLL-68500-THThrough Hole1:1.791-34-6(1-3) 0.71
(4-6) 2.05
3000(4-6)
5.2
0.40 x 0.40 x 0.28
LL-68560-SMLL-68500-SMSurface Mount1:1.791-34-6(1-3) 0.71
(4-6) 2.05
3000(4-6)
5.2
0.40 x 0.40 x 0.28
LL-68555-THLL-68500-THThrough Hole1:1.51-34-6(1-3) 0.75
(4-6) 2.05
3000(4-6)
5.2
0.40 x 0.40 x 0.28
LL-68555-SMLL-68500-SMSurface Mount1:1.51-34-6(1-3) 0.75
(4-6) 2.05
3000(4-6)
5.2
0.40 x 0.40 x 0.28
LL-68550-THLL-68500-THThrough Hole1:2.5
1:1.79
1-34-8
5-7
(1-3) 0.87
(4-8) 2.52
4000(4-8)
7.1
0.625 x 0.625 x 0.32
LL-68550-SMLL-68500-SMSurface Mount1:2.5
1:1.79
1-34-8
5-7
(1-3) 0.87
(4-8) 2.52
4000(4-8)
7.1
0.625 x 0.625 x 0.32
LL-68545-THLL-68500-THThrough Hole2.12:1
1.5:1
4-8
5-7
1-3(1-3) 0.82
(4-8) 2.12
4000(4-8)
8.0
0.625 x 0.625 x 0.32
LL-68545-SMLL-68500-SMSurface Mount2.12:1
1.5:1
4-8
5-7
1-3(1-3) 0.82
(4-8) 2.12
4000(4-8)
8.0
0.625 x 0.625 x 0.32
LL-68540-THLL-68500-THThrough Hole1:21-34-6(1-3) 0.52
(4-6) 2.05
3000(4-6)
4.5
0.40 x 0.40 x 0.28
LL-68540-SMLL-68500-SMSurface Mount1:21-34-6(1-3) 0.52
(4-6) 2.05
3000(4-6)
4.5
0.40 x 0.40 x 0.28
LL-68535-THLL-68500-THThrough Hole1:1.661-34-6(1-3) 0.72
(4-6) 2.05
3000(4-6)
2.73
0.40 x 0.40 x 0.28
LL-68535-SMLL-68500-SMSurface Mount1:1.661-34-6(1-3) 0.72
(4-6) 2.05
3000(4-6)
2.73
0.40 x 0.40 x 0.28
LL-68530-THLL-68500-THThrough Hole1:1.411-34-6(1-3) 0.80
(4-6) 2.05
3000(4-6)
2.73
0.40 x 0.40 x 0.28
LL-68530-SMLL-68500-SMSurface Mount1:1.411-34-6(1-3) 0.80
(4-6) 2.05
3000(4-6)
2.73
0.40 x 0.40 x 0.28
LL-68525-THLL-68500-THThrough Hole1:11-34-6(1-3) 2.05
(4-6) 2.14
3000(1-3)
2.73
0.40 x 0.40 x 0.28
LL-68525-SMLL-68500-SMSurface Mount1:11-34-6(1-3) 2.05
(4-6) 2.14
3000(1-3)
2.73
0.40 x 0.40 x 0.28
LL-68520-THLL-68500-THThrough Hole1:1.411-34-6(1-3) 0.82
(4-6) 1.95
3000(4-6)
2.73
0.40 x 0.40 x 0.28
LL-68520-SMLL-68500-SMSurface Mount1:1.411-34-6(1-3) 0.82
(4-6) 1.95
3000(4-6)
2.73
0.40 x 0.40 x 0.28
LL-68510-THLL-68500-THThrough Hole1.25:1
1.66:1
1-34-8
5-7
(1-3) 2.90
(4-8) 1.20
4000(1-3)
4.7
0.625 x 0.625 x 0.32
LL-68510-SMLL-68500-SMSurface Mount1.25:1
1.66:1
1-34-8
5-7
(1-3) 2.90
(4-8) 1.20
4000(1-3)
4.7
0.625 x 0.625 x 0.32
LL-68505-THLL-68500-THThrough Hole1.4:1
2:1
1-34-8
5-7
(1-3) 2.90
(4-8) 1.08
7200(1-3)
4.7
0.625 x 0.625 x 0.32
LL-68505-SMLL-68500-SMSurface Mount1.4:1
2:1
1-34-8
5-7
(1-3) 2.90
(4-8) 1.08
7200(1-3)
4.7
0.625 x 0.625 x 0.32
LL-68500-THLL-68500-THThrough Hole1:1
1:0.707
1-34-8
5-7
(1-3) 2.90
(4-8) 1.42
4000(1-3)
4.7
0.625 x 0.625 x 0.32
LL-68500-SMLL-68500-SMSurface Mount1:1
1:0.707
1-34-8
5-7
(1-3) 2.90
(4-8) 1.42
4000(1-3)
4.7
0.625 x 0.625 x 0.32
6856568500Surface Mount1:2.51-34-6(1-3) 1.0
(4-6) 2.8
30000.40 x 0.40 x 0.25
6856068500Surface Mount1:1.791-34-6(1-3) 0.9
(4-6) 2.5
30000.40 x 0.40 x 0.25
6855568500Surface Mount1:1.51-34-6(1-3) 0.9
(4-6) 2.5
30000.40 x 0.40 x 0.25
6855068500Surface Mount1:2.5
1:1.79
1-34-8
5-7
(1-3) 1.0
(4-8) 3.5
40000.625 x 0.625 x 0.315
6854568500Surface Mount2.12:1
1.5:1
4-8
5-7
1-3(1-3) 1.0
(4-8) 3.5
40000.625 x 0.625 x 0.315
6854068500Surface Mount1:21-34-6(1-3) 1.3
(4-6) 2.6
30000.40 x 0.40 x 0.25
6853568500Surface Mount1:1.661-34-6(1-3) 1.5
(4-6) 2.4
30000.40 x 0.40 x 0.25
6853068500Surface Mount1:1.411-34-6(1-3) 2.2
(4-6) 2.7
30000.40 x 0.40 x 0.25
6852568500Surface Mount1:11-34-6(1-3) 2.5
(4-6) 2.8
30000.40 x 0.40 x 0.25
6852068500Surface Mount1:1.411-34-6(1-3) 2.2
(4-6) 2.7
30000.40 x 0.40 x 0.25
6851568500Surface Mount2.3:1
3.2:1
4-8
5-7
1-3(1-3) 1.2
(4-8) 3.0
30000.625 x 0.625 x 0.315
6851068500Surface Mount1.25:1
1.66:1
1-34-8
5-7
(1-3) 3.2
(4-8) 3.0
40000.625 x 0.625 x 0.315
6850568500Surface Mount1.4:1
2:1
1-34-8
5-7
(1-3) 3.5
(4-8) 3.0
72000.625 x 0.625 x 0.315
6850068500Surface Mount1:1
1:0.707
1-34-8
5-7
(1-3) 3.0
(4-8) 3.0
40000.625 x 0.625 x 0.315