Year: 2025

STPS40H100CW Diode – 100V, 20A, Schottky Rectifier ( PDF )

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Part Number: STPS40H100CW

Function: 100V, 20A, High voltage power Schottky Rectifier

Package: TO-247 Type

Manufacturer: STMicroelectronics

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STPS40H100CW datasheet pdf

 

Description

The STPS40H100CW is a dual center-tap Schottky rectifier rated at 100V and 40A total (2 × 20A), designed for high-efficiency power conversion in high-frequency applications. Fabricated using advanced Schottky barrier technology, it offers very low forward voltage drop and negligible reverse recovery losses, making it highly suitable for switch-mode power supplies (SMPS), DC-DC converters, and inverter systems. The device is housed in a TO-247 package for effective thermal management and high current capability.

Features

  • Dual center-tap configuration (2 × 20A)
  • Negligible switching losses due to Schottky operation (no reverse recovery)
  • Low forward voltage drop (VF) for improved efficiency
  • Low reverse leakage current
  • Optimized trade-off between leakage and conduction loss
  • Low thermal resistance package (TO-247)
  • Avalanche capability specified for robustness
  • Suitable for high-frequency operation

Pinout

STPS40H100CW datasheet

Absolute Maximum Ratings (Tc = 25 °C)

Parameter Symbol Value Unit
Repetitive Peak Reverse Voltage VRRM 100 V
Average Forward Current (per diode) IF(AV) 20 A
Surge Forward Current IFSM (Typically high, consult datasheet) A
Operating Junction Temperature Tj 150 °C
Storage Temperature Tstg -55 to 150 °C

Design Notes

  • Schottky structure eliminates reverse recovery charge (Qrr ≈ 0), significantly reducing switching loss in high-frequency converters
  • Forward voltage typically ranges ~0.5–0.85V depending on current and temperature, improving efficiency over PN diodes
  • Thermal design is critical: TO-247 allows mounting to heatsink for high current operation
  • Leakage current increases with temperature — consider thermal derating in high ambient conditions
  • Center-tap configuration is ideal for full-wave rectification in push-pull or half-bridge topologies

Typical Circuit Usage

  • Output rectification stage in SMPS (flyback, forward, half-bridge)
  • Freewheeling diode in buck converters
  • High-frequency DC-DC converter rectifier
  • Secondary-side rectification in isolated converters
  • Inverter output rectification

How to Choose This Part

  • Select for applications requiring fast switching and low loss at ≤100V
  • Ensure average and surge current margins are sufficient
  • Prefer for high-frequency (>50kHz) operation where PN diode losses are significant
  • Evaluate thermal resistance and heatsinking requirements carefully
  • Consider leakage characteristics in high-temperature environments

Applications

  • Switch-mode power supplies (SMPS)
  • High-frequency DC-DC converters
  • Power inverters
  • UPS systems
  • Industrial power conversion systems

Alternative / Equivalent Products

  • MBR40200CT (200V higher voltage alternative)
  • STPS60L100CW (higher current variant)
  • VS-40CPQ100 (Vishay equivalent)
  • BYV32 series (ultrafast alternative, not Schottky)
  • STPS30H100CT (lower current option)

Other data sheets are available within the file: STPS40H100, STPS40H100C

 

STPS40H100CW Datasheet PDF Download


STPS40H100CW pdf

20D101 Datasheet – 100V, Metal Oxide Varistor ( PDF )

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20D101 is a 20 mm radial leaded metal oxide varistor (MOV) from the MOV-20DxxxK series, designed for robust overvoltage transient suppression.

Function: 20mm, 100V, Metal Oxide Varistor

Package: Disk Type

Manufacturer: Bourns, Inc

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Varistor 20D101 datasheet

Description

The MOV-20D101 Series of 20 mm radial leaded varistor devices protects against overvoltage transients such as lightning, power contact and power induction.

The metal oxide varistors offer a choice of varistor voltages from 18 V to 1800 V and Vrms voltages from 11 V to 1100 V. The devices have a high current handling, high energy absorption capability and fast response times to protect against transient faults up to rated limits.

It provides bidirectional protection against high-energy surges such as lightning strikes, switching transients, and inductive load disturbances. With high surge current capability and fast response time, it is commonly used in power line protection circuits.

Features

  • Nominal varistor voltage: ~100 V (code “101”)
  • Large 20 mm disc for high energy absorption
  • High surge current handling capability
  • Fast response time (nanosecond range)
  • Bidirectional clamping characteristics
  • Wide voltage range across series (18 V to 1800 V)
  • Suitable for AC and DC transient suppression

Functional Description

  • Acts as a voltage-dependent resistor: high resistance at normal voltage, low resistance during overvoltage
  • Clamps transient voltages by rapidly conducting surge current
  • Returns to high impedance after transient event

Design Notes

  • Select MOV voltage rating above normal operating voltage to avoid premature conduction
  • Use in conjunction with fuses or thermal protection to prevent failure under sustained overvoltage
  • Place close to input power lines for optimal surge suppression
  • Consider degradation over repeated surge events (aging effect)
  • Ensure proper spacing and insulation for high-energy applications

Typical Applications

  • AC/DC power line surge protection
  • Switching power supplies
  • Industrial equipment protection
  • Consumer electronics (TVs, appliances)
  • Motor drives and relay circuits

How to Choose This Part

  • Select based on working voltage (AC/DC) and required clamping level
  • Choose disc size (20 mm here) based on surge energy requirements
  • Ensure surge current rating matches expected transient levels
  • Consider environmental and reliability requirements

Alternative / Equivalent Products

  • 14D101 (smaller size, lower energy)
  • 20D151 (higher voltage variant)
  • S14K100 (EPCOS equivalent)
  • V20E100 (Littelfuse equivalent)

Other data sheets are available within the file: 20D102, 20D112, 20D121, 20D151

20D101 Datasheet PDF Download


20D101 pdf