TDK EPCOS Code B59154U1135B140 Alternative
PTC Thermistor for Telecom Overload Proection,
Leaded Disk Coated 650V 50 Ohm 3A

AMWEI Ordering Code: AMZ23-50RM075

Appearance and Dimension

Telecom PTC Leaded Disk Coated Appearance Engineering Drawing

Telecom PTC Leaded Disk Coated Appearance Engineering Drawing

  • Silicon resin coated ceramic body, grey color
  • Coated ceramic body outer diameter D : 9.5mm max.
  • Coated ceramic body thickness T: 5.5mm max.
  • Pin wire diameter d: 0.6mm

Application

Overcurrent overload protection for telecom applications
Suitable for line card applications e.g. POTS, access networks,
customer premises equipment (CPE) or integrated voice data (IVD)

Features

Compliant with ITU-T standards

  • basic-level lightning surges (10/700 µs)
  • basic-level power induction (600 V, 1 A, 0.2 s)
  • power contact criteria A/B (230 V, 15 min.)

Matching available with narrow resistance tolerance.
Tight resistance matching maintained after switching.
Negligible resistance drift after soldering or switching.

Electrical Specifications

  • Resistance @25C  R25 : 50Ω,
  • Standard R25 tolerance +/-  20%, tight tolerance +/-  15% can be supplied upon request.
  • R25 resistance matching per packing unit can be supplied upon request.
  • Rated voltage (RMS) : 230 V
  • Maximum operating voltage Vmax: 650 V
  • Maximum permissible repetitive turn over current Imax: 3 A
  • Non-trip Current at +25C : 75 mA
  • Non-trip Current at +40C:  60 mA
  • PTC Thermistor Trip Current, Operating Current at +25℃ It : 150 mA
  • Tripping time at +25C:
    1A→ 0.5A: 0.35~0.65 seconds.
    0.5A→0.15A, 3 seconds
    0.35A→0.15, 6 seconds
  • Tripping time at max. current 3A: <0.2 seconds,
  • Operating ambient temperature range (V=0): -40~+125C
  • Operating ambient temperature range (V=230V) :  0~60C

Reliability Data

Test Item Standard Test conditions |ΔR25/R25|
Electrical endurance,
cycling
IEC 60738-1 Room temperature, 3A; 230V
Number of cycles: 10
<20%
Electrical endurance,
constant
IEC 60738-1 storage at Voltage: 230V
Ambient temperature: +60C
Test duration: 1000 h
<25%
Damp heat IEC 60738-1 Temperature of air: 40℃,
Relative humidity of air: 93%,
Duration: 56 days
Test according to IEC  60068-2-78
<10%
Lead wire tensile IEC60068-2-21 Test Ua: pull strength 10N, 10 seconds,
Test Ub: bending 90°, pull strength 5N,
successively twice.
Test Uc: revolving 180°,
successively twice.
<20%
Rapid change
of temperature
IEC 60738-1 T1 = Top,min (0 V), T2 = Top,max (0 V)
Number of cycles: 5
Test duration: 30 min
Test according to IEC 60068-2-14, test Na
<10%
Climatic sequence IEC 60738-1 Dry heat: T = Top,max (0 V)
Test duration: 16 h
Damp heat first cycle
Cold: T = Top,min (0 V)
Test duration: 2 h
Damp heat 5 cycles
Tests performed according to
IEC 60068-2-30
<10%

ITU Performance

Test Item Condition Test Method Performance Requirement
Over Current Withstanding 220V/3A,
20 cycles
Max. voltage of supply: 220VAC,
Initial current: 3A.
ON 60S, OFF 600S ,
Cycle:20 times,
No damage, 4 hours after the conditioning
then re-test Rn. Zero power resistance at 25℃
ΔR/Rn≤20%.
Lightning Surge Current Withstanding 10/1000μs,
30 cycles
Duration: 30 times, Temperature: 25℃
Short circuit current wave:10/1000μs,  Minimum open voltage: 4 KV
Short circuit current peak value: 25A
Interval time: 3min
No damage, 4 hours after the conditioning
then re-test Rn. Zero power resistance at 25℃
ΔR/Rn≤20%.
Power Line Contact
(Over Voltage Withstanding)
250V/3A,
15 minutes
Duration: 1 cycle
Ambient Temperature: 25 ± 2 ℃
Voltage: 250 Vrms Frequency: 50Hz
Current: 3A, 15 minutes On
No damage, 4 hours after the conditioning
then re-test Rn. Zero power resistance at 25℃
ΔR/Rn≤20%.
Induction  Voltage
Withstanding
650V/1.1A,
20 cycles
Duration: 20 cycles
Voltage: 650Vdc
Temperature: 25℃
Current: 1.1A
Cycle: 1 sec ON/60sec. OFF
No damage, 4 hours after the conditioning
then re-test Rn. Zero power resistance at 25℃
ΔR/Rn≤20%.
Fail Model 650V/10A,
30 minutes
Voltage of power supply: 650VAC. Initial current: 10Arms.
Energized time: 30min.
High resistance or open circuit is allowable. Low resistance state or firing is not allowed

Packaging Information

Loose bulk in plastic package.

Technical Knowledge