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Vishay General Semiconductor - Diodes Division SMCJ20A-M3/57T
- Part No.:
- SMCJ20A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20A-M3/57T.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,602
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Product details
Overview
SMCJ20A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V clamping voltage (VC) at 46.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ20A-M3/57T datasheet, SMCJ20A-M3/57T pinout, SMCJ20A-M3/57T application, or SMCJ20A-M3/57T equivalent, this page delivers verified electrical parameters, thermal derating behavior, junction-to-lead thermal resistance, polarity marking convention, and halogen-free RoHS-compliant sourcing status per Vishay's M3 suffix specification.
Technical Context
The SMCJ20A-M3/57T operates as a unidirectional avalanche diode, leveraging glass-passivated silicon junction technology to achieve sub-nanosecond response time and low incremental surge resistance. Its clamping action begins at VBR ≥ 22.2 V and limits transient voltages to ≤ 32.4 V under 46.3 A 10/1000 µs surges, with thermal resistance RθJL = 15 °C/W enabling effective heat transfer to PCB copper pads.
Designed for mounting on 8.0 mm × 8.0 mm copper pads per terminal, it supports operation from –55 °C to +150 °C junction temperature and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The cathode band marking identifies polarity, and its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above nominal rail. |
| VC @ IPPM | 32.4 V at IPPM = 46.3 A - Clamped voltage during 1500 W transient; protects downstream ICs rated ≤ 33 V absolute max. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; suitable for ISO 7637-2 Pulse 1/2/5a automotive transients. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with proper PCB thermal design. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; allows direct conduction path to PCB copper for surge energy dissipation. |
| ID @ VWM | 1.0 µA - Reverse leakage at 20 V; negligible power loss in standby, critical for battery-powered sensor nodes. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant (M3 suffix), with matte tin-plated leads and cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for unidirectional TVS configuration | Connected to protected line (e.g., 24 V rail); clamps positive transients to ground when voltage exceeds VBR. |
| Anode | Ground reference terminal | Connected to system ground plane; completes clamping path during overvoltage events; requires low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Withstands high-energy transients like ISO 7637-2 Pulse 5a without degradation, supporting automotive-grade reliability. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic inputs within safe margins during clamping. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with automated assembly lines using 260 °C peak profile. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance requirements for EU, China RoHS, and automotive OEM sustainability mandates. |
| 150 °C maximum junction temperature | Supports operation in high-ambient environments such as engine control units and industrial motor drives. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 24 V battery-fed ECU power input exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input rail and ground. Use Value: Limits transients to ≤32.4 V during 1500 W surges, preventing damage to upstream DC/DC converters and microcontrollers. |
Use Scenario: Analog output line (e.g., 4–20 mA loop) in factory automation sensors subject to ESD and cable coupling. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp on signal path to protect ADC front-end and isolation amplifiers. Use Value: Sub-nanosecond response and <1 µA leakage preserve signal integrity while suppressing ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Inputs |
Use Scenario: -48 V telecom rectifier output feeding base station backplane with lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage suppression stage before secondary regulation and hot-swap controllers. Use Value: 1500 W PPPM rating handles repetitive surges up to 46.3 A, meeting GR-1089-CORE Level 3 immunity requirements. |
Use Scenario: Brushed DC motor driver board in smart home appliances experiencing inductive kickback during PWM switching. IC Role / Device Role / Timing Role: Snubber-style TVS across H-bridge supply rail to absorb flyback energy. Use Value: Low RθJL (15 °C/W) and 200 A IFSM enable repeated surge absorption without thermal runaway or bond wire failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (100 °C/W) | Restricted to lower-energy transients (e.g., IEC 61000-4-5 Level 2); unsuitable for automotive load dump. | Select only for space-constrained consumer electronics where 1500 W capability is unnecessary. |
| SMCJ20CA-M3/57T | Bidirectional variant; same VWM (20 V), symmetric clamping in both polarities; identical PPPM and package | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where negative transients occur. | Choose when protecting bidirectional data lines or ungrounded circuits - not a drop-in replacement for unidirectional use. |
Compared with SMAJ20A-E3/57T, the SMCJ20A-M3/57T delivers 3.75× higher surge power handling and superior thermal performance via SMC packaging; versus SMCJ20CA-M3/57T, it offers optimized unidirectional clamping with lower leakage and simpler grounding, ideal for DC rail protection.
Availability
SMCJ20A-M3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, telecom power supplies, and appliance motor drive designs requiring stable component supply with halogen-free compliance and AEC-Q101-ready qualification path.
Supply support for SMCJ20A-M3/57T 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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMCJ20A-M3/57T under maximum rated surge current?
The SMCJ20A-M3/57T exhibits a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 46.3 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The SMCJ20A-M3/57T maintains this clamping performance across its specified operating temperature range, ensuring predictable protection for downstream 3.3 V, 5 V, and 24 V ICs.
Is the SMCJ20A-M3/57T suitable for automotive applications?
Yes - the SMCJ20A-M3/57T is halogen-free and RoHS-compliant (M3 suffix), and its base family is AEC-Q101 qualified (via HE3/HM3 variants). While the SMCJ20A-M3/57T itself carries commercial-grade M3 marking, its electrical specs, thermal robustness (TJ max. = +150 °C), and mechanical construction align with automotive power rail protection requirements. For certified AEC-Q101 deployment, specify SMCJ20A-HM3/57T; the SMCJ20A-M3/57T serves as a direct form-fit-function alternative with identical surge ratings.
How does the SMCJ20A-M3/57T differ from the bidirectional SMCJ20CA-M3/57T?
The SMCJ20A-M3/57T is unidirectional with cathode-band polarity marking and clamps only positive transients relative to ground, whereas the SMCJ20CA-M3/57T is bidirectional, offering symmetrical clamping for both polarities without polarity marking. Both share identical VWM (20 V), PPPM (1500 W), and SMC package, but the SMCJ20A-M3/57T has lower reverse leakage (<1 µA vs. ≤2 µA for CA version) and is preferred for DC rail protection. The SMCJ20A-M3/57T cannot replace SMCJ20CA-M3/57T in AC or floating applications.
What is the recommended PCB pad layout for optimal thermal performance of the SMCJ20A-M3/57T?
Vishay specifies mounting the SMCJ20A-M3/57T on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated PPPM and thermal derating. These pads must be directly connected to internal ground/power planes via multiple thermal vias (≥4 per pad, 0.3 mm diameter) to realize the stated RθJL of 15 °C/W. Deviation from this layout reduces surge current handling and accelerates junction temperature rise - the SMCJ20A-M3/57T's performance is validated only under these conditions.
Does the SMCJ20A-M3/57T require external series impedance for effective protection?
No - the SMCJ20A-M3/57T functions as a shunt protector and does not require series impedance to operate, but adding a small series resistor (e.g., 1–10 Ω) or ferrite bead upstream improves current limiting and reduces di/dt stress during clamping. This enhances longevity under repetitive surges and complements the SMCJ20A-M3/57T's intrinsic low incremental surge resistance. Layout best practice dictates minimizing trace inductance between the SMCJ20A-M3/57T and protected node to preserve sub-nanosecond response.
SMCJ20A-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ20A-M3/57T FAQ
1.How can I place an order for SMCJ20A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20A-M3/57T 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 SMCJ20A-M3/57T reliable?
The price and inventory of SMCJ20A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ20A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20A-M3/57T?
SMCJ20A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20A-M3/57T 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 SMCJ20A-M3/57T?
For technical support, including SMCJ20A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20A-M3/57T requirements.
6.How does Aetrix verify that SMCJ20A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ20A-M3/57T 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 SMCJ20A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ20A-M3/57T?
All SMCJ20A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20A-M3/57T, 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 SMCJ20A-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ20A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20A-M3/57T Tags
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