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Vishay General Semiconductor - Diodes Division SMCJ45AHE3/57T
- Part No.:
- SMCJ45AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45AHE3/57T.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,973
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Product details
Overview
SMCJ45AHE3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), and clamps transients to ≤72.7 V at 20.6 A. It is widely deployed in automotive ECUs and industrial motor drives to protect MOSFETs and microcontrollers from inductive switching surges.
For engineers reviewing the SMCJ45AHE3/57T datasheet, SMCJ45AHE3/57T pinout, SMCJ45AHE3/57T application, or SMCJ45AHE3/57T equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AB (SMC) package with cathode band polarity marking, 150 °C max junction temperature, and low 0.102 %/°C VBR temperature coefficient - critical for stable clamping in thermally varying environments.
Technical Context
The SMCJ45AHE3/57T operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response to ESD and lightning-induced transients. Its unidirectional configuration provides forward conduction only during reverse overvoltage events, with VF = 3.5 V at 100 A (forward surge).
It is rated for 200 A non-repetitive peak forward surge current (8.3 ms half-sine), 6.5 W steady-state power dissipation at TA = 50 °C, and exhibits RθJA = 75 °C/W and RθJL = 15 °C/W thermal resistance - confirming suitability for surface-mount PCB layouts with minimal copper pad area (8.0 mm × 8.0 mm per terminal).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse operating voltage before clamping initiates; defines safe working range for protected circuitry. |
| VBR min/max | 50.0 V / 55.3 V at IT = 1 mA - ensures reliable avalanche turn-on within tight tolerance, critical for predictable protection threshold. |
| VC @ IPPM | ≤72.7 V at 20.6 A - clamping voltage under full 1500 W surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W (10/1000 µs waveform) - peak transient energy handling capacity; supports IEC 61000-4-5 Level 4 compliance when properly laid out. |
| ID @ VWM | ≤1.0 µA - ultra-low leakage at rated standoff, minimizing standby power loss and avoiding false triggering in high-impedance sensor lines. |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial ambient conditions without derating. |
| Temp. coeff. of VBR | 0.102 %/°C - low drift ensures stable clamping across temperature; essential for precision protection in wide-range environments. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, RoHS-compliant, AEC-Q101 qualified, matte tin-plated leads solderable per J-STD-002. Cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse surge return path | Connected to ground or low-impedance return plane; must handle 200 A surge without trace fusing. |
| Cathode | Reverse-biased terminal / clamping node | Connected to protected line (e.g., 45 V supply rail); band-marked end defines polarity for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for ECU, ADAS, and body control modules. |
| Glass-passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives, improving field lifetime in humid industrial settings. |
| Low incremental surge resistance | Enables tighter VC vs. IPPM relationship - reduces voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a). |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk during assembly. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets fire-safety requirements for industrial and transportation equipment enclosures. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed gate drivers and CAN transceivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VDD and GND rails to clamp transients exceeding 45 V. Use Value: Limits voltage excursion to ≤72.7 V during 120 V/400 ms load dump events, preventing latch-up or oxide breakdown in 65 nm MCU I/O cells. |
Use Scenario: Safeguarding PWM input pins of isolated gate drivers in servo inverters subjected to IGBT switching noise. IC Role / Device Role / Timing Role: Clamping device on low-voltage logic side of optocoupler-isolated feedback path. Use Value: Sub-1 ns response suppresses <100 ns ringing spikes from parasitic inductance, maintaining clean timing margins for 20 kHz PWM signals. |
| Telecom DC Power Feeds | Consumer Appliance Mainboard Protection |
|
Use Scenario: Shielding PoE-powered Ethernet PHYs and PMICs from induced surges on 57 V DC feed lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on midspan injector output, upstream of DC-DC converter input. Use Value: 1500 W rating handles combined lightning + switching surge energy per IEC 61000-4-5 Combination Wave (1.2/50 µs + 8/20 µs), preserving PHY link integrity. |
Use Scenario: Guarding microcontroller reset and UART lines in smart washing machine mainboards against relay contact bounce. IC Role / Device Role / Timing Role: Point-of-load TVS on 3.3 V/5 V rails feeding MCU peripherals. Use Value: 1.0 µA max leakage avoids pull-up resistor loading, ensuring reliable reset assertion and UART idle-state detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45AHE3/52T | Lower PPPM (600 W), SMB (DO-214AA) package, same VWM/VBR specs | Limited to lower-energy transients (e.g., ESD-only); unsuitable for load dump or IEC 61000-4-5 Level 3+ | Select when board space is constrained and surge threat level is defined as IEC 61000-4-2 only. |
| SMCJ45CAHE3/57T | Bidirectional variant; identical VWM/VBR but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD differential pairs) | Choose for bidirectional protection where polarity reversal or AC transients are present. |
Compared with SMBJ45AHE3/52T, the SMCJ45AHE3/57T delivers 2.5× higher surge energy handling and superior thermal dissipation via larger SMC footprint; compared with SMCJ45CAHE3/57T, it offers lower capacitance and optimized forward conduction for DC rail protection - making it the preferred choice for unidirectional 45 V power line hardening.
Availability
SMCJ45AHE3/57T is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor drive development, and telecom power system integration requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCJ45AHE3/57T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMCJ series was engineered specifically for high-power transient suppression in harsh-environment applications, emphasizing AEC-Q101 compliance, low clamping ratio, and robust surge endurance - directly addressing design needs in modern 48 V architectures and industrial automation.
FAQ
What is the maximum clamping voltage of the SMCJ45AHE3/57T under full-rated surge current?
The SMCJ45AHE3/57T clamps to a maximum of 72.7 V when subjected to its rated peak pulse current of 20.6 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, Document Number 88394. The clamping performance ensures downstream 45 V-rated ICs remain within absolute maximum ratings during surge events.
Is the SMCJ45AHE3/57T suitable for automotive applications?
Yes, the SMCJ45AHE3/57T carries AEC-Q101 qualification (as indicated by the "HE3" suffix), validating its reliability for automotive use cases including engine control units, body electronics, and ADAS power supplies. It operates across –55 °C to +150 °C and meets MSL Level 1, supporting lead-free reflow and under-hood thermal cycling requirements.
How does the SMCJ45AHE3/57T differ from the bidirectional SMCJ45CAHE3/57T?
The SMCJ45AHE3/57T is unidirectional, with a cathode band marking and forward conduction capability (VF = 3.5 V at 100 A), while the SMCJ45CAHE3/57T is bidirectional and symmetrical in both directions. The unidirectional version offers lower junction capacitance and is optimized for DC power rail protection; the bidirectional variant is used for AC or floating signal lines like CAN or RS-485.
What is the thermal resistance from junction to ambient for the SMCJ45AHE3/57T?
The typical thermal resistance from junction to ambient (RθJA) for the SMCJ45AHE3/57T is 75 °C/W, measured on the standard 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad layout per terminal. This value assumes no additional heatsinking and is critical for calculating safe power derating above 25 °C ambient temperature.
Does the SMCJ45AHE3/57T meet UL safety standards?
Yes, the SMCJ45AHE3/57T is Underwriters Laboratories (UL) recognized under file number E136766 for both unidirectional and bidirectional devices, complying with UL 497B for signal and power line protectors. Its molding compound also meets UL 94 V-0 flammability rating, satisfying enclosure-level fire safety requirements.
SMCJ45AHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ45AHE3/57T FAQ
1.How can I place an order for SMCJ45AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45AHE3/57T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMCJ45AHE3/57T reliable?
The price and inventory of SMCJ45AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45AHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ45AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45AHE3/57T?
SMCJ45AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45AHE3/57T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMCJ45AHE3/57T?
For technical support, including SMCJ45AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45AHE3/57T requirements.
6.How does Aetrix verify that SMCJ45AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ45AHE3/57T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMCJ45AHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ45AHE3/57T?
All SMCJ45AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45AHE3/57T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMCJ45AHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ45AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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