Switchcraft Balanced 1/4" Panel Mount Jack Littel-Jax phone jacks mate with standard commercial phone plugs and are available with .25 inch and .21 inch inside diameter bushings. MIL Littel-Jax® PHONE JACKS 2- and 3-CONDUCTOR MIL-SPEC, MIL-J-641 (E) MIL jacks mate with MIL-type phone plugs with .25 inch (6.35mm) or .21 inch (5.34mm) diameter bushings. Numbers C11 and C12B have a non-turn locating pin which keys the jack to the mounting surface. For low contact resistance applications, jack number C12A has fine silver contacts on shunts and tip springs. MOUNTING Chassis/Panel: See Mounting Data drawing below; small hole is required only for jacks numbers C11 and C12B with non-turn locating pin. Maximum Panel Thickness: .156 inch (4mm) for standard .276 inch (7mm) long bushing; .25 inch (6.35mm) for .375 inch (9.5mm) long bushing. NOTE: For panels thicker than .25 inch see Thick Panel Phone Jax. Insulated Mount: See drawing. S1028 flatwasher and Part Number S1029 shoulder washer must be ordered separately for mounting in .437 inch diameter hole. NOTE: See Hi-D Jax® for jack specifically designed for insulated mounting without additional washers. PC Board Mounting: See Recommended PC Board Layout drawing below for jacks with PC terminals. Recommended PC board thickness is .062 inches. Mounting Centers: 1.188 inch (30mm) recommended. Centers may vary with jack selected, for example, Number 11 mounts on .813 inch (20.6mm) and 14B mounts on 1.125 inch (28.6mm) minimum centers. PREFIX OPTIONS
| SERIES | CIRCUITRY | | Blank- 1/4" Commercial | Jack 1-Littel Jax®
| 1- I | C- Accepts Mill Plug
| | 2A- III | FA- .205" Faston Terminals
| | 2B- IV | FAL- .205" Faston Terminals and .375" Long Bushing
| | 3- V | L- .375" Long Bushing
| | 3A- VI | PC- PC Terminals
| | 3B- VII | S- Accepts .206 Diameter Plugs
| | 3E- IX
| | | | 4B- XII |
| TWO CONDUCTOR PART NUMBERS | Part Number
| Description
| Jack Schematic1 | Typical Mating Plug
| 11
| Open circuit
| I
| 250
| C11
| MIL Number M641/6-1
| I
| 440
| FA11
| .205 inch FASTON terminal
| I
| 250
| FAL11
| .375 inch long bushing
.205 FASTON terminal
| I
| 250
| L11
| .375 inch long bushing | I
| 250
| 12A
| Tip shunt | III
| 250
| C12A
| MILNumber M641/12-1 | III
| 440
| L12A
| .375 inch long bushing | III
| 250
| PC12A
| PC board mount | III
| 250
| 13
| Isolated "make" circuit | V
| 250
| 13A
| Transfer circuit | VI
| 250
| | 13E | Isolated "break" circuit | IX | 250 | | THREE CONDUCTOR PART NUMBERS | 12B
| Double open circuit
| IV
| 267
| L12B
| .375 inch long bushing
| IV
| 267
| C12B
| MIL number M641/5-1,
.210 inch inside diameter
| IV
| 480
| 13B
| Tip shunt
| VII
| 267
| | 14B | Double closed circuit | XII | 267 | | PART NUMBERS (.210 inch inside diameter bushing) | S11
| 2 conductor
| I | S250
| S12A
| 2 conductor
| III
| S250
| S12B
| 3 conductor
| IV
| S267
| | S13B | 3 conductor | VII | S267 | | 1 Refer to jack schematics on pages 65 and 66. Other circuits are available; contact factory. |
SPECIFICATIONS MECHANICAL Life: Commercial Jacks - 10,000 insertion/withdrawal cycles, minimum. Military Jacks - 20,000 insertions/withdrawals, minimum. Mechanical Shock: Military Jacks - Per MIL-STD 202, method 213, Test Condition H (75g). Vibration: Military Jacks - Per MIL-STD-202, method 213, (10-55 Hz). Insertion/Withdrawal Forces: (see charts below) | Commercial Jacks | Plug Diameter (inches)
| .210
| .250
| Insertion (maximum)
| 7 lb.
| 7 lb.
| | Withdrawal (minimum) | 1 lb. | 1 lb. |
| Military Jacks | Part Number
| C11
| C12A
| C12B
| Insertion (maximum)
| 6 lb.
| 7 lb.
| 6 lb.
| Withdrawal (minimum)
| 2 lb.
| 3 lb.
| 1.5 lb.
| | Withdrawal (maximum) | 7 lb. | 7 lb. | 5 lb. |
ELECTRICAL Contact Resistance: Commercial Jacks - .030 ohms maximum (initial), .050 ohms maximum (after humidity, durability exposure). Per MIL-STD-202E. Military Jacks - .010 ohms maximum (initial), .020 ohms maximum (after life), .10 ohms maximum (after salt spray). Insulation Resistance: Commercial Jacks - 10,000 M(omega) minimum (initial), 1,000 M(omega) minimum (after humidity). Military Jacks - 10,000 M(omega) minimum (initial), 1,000 M(omega) minimum (after humidity, durability exposure). Dielectric Withstanding Voltage: 500 V, 60 Hz (rms) AC. Contact Rating: 1 A, 25 V DC. ENVIRONMENTAL Thermal Range: Commercial Jacks; -55°C to 85°C (non- operating); -20°C to 65°C (operating). Military Jacks; -55°C to 85°C (non-operating); -40°C to 65°C (operating). Thermal Shock: Commercial Jacks - Per MIL-STD 202, method 107. Military Jacks - Per MIL-STD 202, method 107. Humidity: Commercial Jacks - Per MIL-STD 202, method 106. Military Jacks - 0% to 95% operating and non-operating. Salt Spray: Commercial Jacks - Per MIL-STD 202, method 101. Military Jacks - Per MIL-STD 202, method 101 (48 hours). Moisture Resistance: Military Jacks - Per MIL-STD 202, method 106 (240 hours). MATERIAL Mounting Bushing: Nickel-plated copper alloy. Insulation: Rigid plastic. Springs: Special copper alloy. Integral contacts are standard in the isolated switching circuits; fine silver contacts in C12A switching circuit. Sleeve Terminal: Copper alloy. Hardware: Supplied with one Number P10001 copper alloy nickel-plated hex nut, and one Number S1022 steel nickel-plated washer - except copper alloy nickel-plated
washer Number S10451 supplied on C11, C12A and C12B. * Commercial jacks feature integral contacts. Integral contacts should not be used where low contact resistance is a requirement.
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