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Vishay General Semiconductor - Diodes Division SMCJ20AHM3_A/H
- Part No.:
- SMCJ20AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20AHM3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ20AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 20 V standoff voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum 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 rail protection and industrial sensor interface circuits.
For engineers reviewing the SMCJ20AHM3_A/H datasheet, SMCJ20AHM3_A/H pinout, SMCJ20AHM3_A/H application, or SMCJ20AHM3_A/H equivalent, key selection criteria include verified AEC-Q101 qualification, halogen-free RoHS compliance (HM3 suffix), unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a clamping device in reverse-biased configuration, triggering when transient voltage exceeds VBR to divert surge current away from protected ICs. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, enabling consistent clamping performance across repeated 10/1000 µs surges up to 1500 W.
The SMCJ20AHM3_A/H is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020, and supports automated SMT placement due to its low-profile SMC package. Its 1.0 µA max reverse leakage at VWM and 0.094 %/°C VBR temperature coefficient support stable operation in thermally varying environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range on protected line. |
| VBR min/max | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown threshold window; ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 32.4 V at 46.3 A - Clamped voltage during full-rated 1500 W surge; determines maximum stress imposed on downstream circuitry. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; quantifies transient energy absorption capability. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm copper pads; guides heatsinking and layout design. |
| TJ max | +150 °C - Maximum allowable junction temperature; sets upper limit for ambient + self-heating in continuous operation. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Cathode identified by molded band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or lower-potential rail; completes surge current loop during clamping event. |
| Cathode | Reverse-biased terminal / clamping node | Connected to protected line (e.g., 24 V supply); conducts only when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power electronics applications requiring extended temperature cycling and long-term reliability. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for Tier-1 automotive suppliers and industrial OEMs with strict material restrictions. |
| 1500 W peak pulse power | Handles high-energy transients from load dump or inductive switching without degradation over rated lifetime. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with 24 V systems. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; supports high-yield automated assembly in volume production. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against ISO 7637-2 Pulse 5a load dump transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤32.4 V, preventing damage to downstream 40 V-rated regulators and ensuring system-level ISO 16750-2 compliance. |
Use Scenario: Safeguarding analog outputs of pressure sensors in factory automation PLC modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Point-of-entry TVS on 4–20 mA current loop output line, mounted adjacent to connector. Use Value: Clamps 1 kV/1 Ω surge to <33 V within <1 ns, preserving 16-bit ADC reference integrity and eliminating false trip events. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Interface |
|
Use Scenario: Shielding PoE-powered network switches from induced surges on 48 V DC input derived from midspan injectors. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of hot-swap controller and primary FET gate driver. Use Value: Absorbs 1500 W surges while maintaining <1 µA leakage at 48 V nominal, avoiding standby power penalty in always-on equipment. |
Use Scenario: Suppressing commutation spikes on microcontroller GPIO lines driving brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Localized TVS on motor driver enable/control line, placed within 5 mm of MCU pin. Use Value: Prevents latch-up in 3.3 V I/O cells by clamping 60 V inductive kick to 32.4 V with sub-nanosecond response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3_A/H | Lower PPPM (400 W), same VWM/VBR/VC, SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained consumer boards with lower surge threat level; not recommended for automotive load dump. | Select when board area is critical and surge energy remains below 400 W - verify thermal margin with reduced copper area. |
| SMCJ20AHE3_A/H | Identical electrical specs and SMC package, but RoHS-compliant commercial grade (E3) without halogen-free or AEC-Q101 qualification | Acceptable for industrial non-automotive use where material compliance and automotive reliability are not mandated. | Choose for cost-sensitive industrial designs where AEC-Q101 and halogen-free requirements do not apply. |
Compared with SMCJ20AHE3_A/H, the SMCJ20AHM3_A/H adds halogen-free construction and AEC-Q101 validation - essential for automotive Tier-1 BOMs - while matching all electrical and mechanical specifications. Against SMAJ20AHE3_A/H, it delivers 3.75× higher surge power handling and superior thermal performance in the same mounting footprint.
Availability
SMCJ20AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom power inputs, and consumer appliance motor controls requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ20AHM3_A/H 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 and application-specific performance.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where robustness against ISO 7637, IEC 61000-4-5, and lightning-induced surges is mandatory.
FAQ
What is the clamping voltage of the SMCJ20AHM3_A/H under full-rated surge conditions?
The SMCJ20AHM3_A/H exhibits a maximum clamping voltage (VC) of 32.4 V when subjected to its rated 46.3 A peak pulse current (IPPM) 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 SMCJ20AHM3_A/H maintains this clamping performance across its specified operating temperature range, making it suitable for protecting 24 V systems where downstream ICs require headroom below 36 V.
Is the SMCJ20AHM3_A/H qualified for automotive applications?
Yes, the SMCJ20AHM3_A/H carries AEC-Q101 qualification, as indicated by the "HM3" suffix and documented in Vishay's official datasheet. It has undergone stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC-Q101 Rev D. The SMCJ20AHM3_A/H is explicitly intended for automotive power electronics such as body control modules, ADAS sensor supplies, and infotainment power rails where reliability under extended thermal and vibration profiles is required.
How does the SMCJ20AHM3_A/H differ from the SMCJ20AHE3_A/H variant?
The SMCJ20AHM3_A/H and SMCJ20AHE3_A/H share identical electrical parameters (VWM, VBR, VC, PPPM) and SMC package dimensions, but differ in material compliance and qualification. The SMCJ20AHM3_A/H is halogen-free and AEC-Q101 qualified, whereas the SMCJ20AHE3_A/H is RoHS-compliant (E3) without halogen-free certification or automotive qualification. The SMCJ20AHM3_A/H is therefore designated for automotive Tier-1 applications, while the SMCJ20AHE3_A/H serves commercial/industrial use cases where those specific certifications are not mandated.
What is the thermal resistance and recommended PCB layout for optimal performance of the SMCJ20AHM3_A/H?
The SMCJ20AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as defined in Vishay's datasheet. To achieve this rating, designers must implement minimum recommended pad layout with solid copper pours connected to both terminals and avoid excessive thermal isolation. The SMCJ20AHM3_A/H is not intended for operation above +150 °C junction temperature, so thermal simulation should confirm margin under worst-case power dissipation and ambient conditions.
Does the SMCJ20AHM3_A/H have polarity marking, and how is it oriented in circuit?
Yes, the SMCJ20AHM3_A/H is unidirectional and features a molded cathode band on one end of the SMC (DO-214AB) package - this band identifies the cathode terminal. In circuit, the cathode connects to the line being protected (e.g., 24 V rail), and the anode connects to ground or the return path. This orientation ensures reverse-biased operation during normal conditions and rapid forward conduction during overvoltage events. The SMCJ20AHM3_A/H must not be installed backward, as incorrect polarity eliminates clamping functionality and risks catastrophic failure under surge.
SMCJ20AHM3_A/H 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ20AHM3_A/H FAQ
1.How can I place an order for SMCJ20AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20AHM3_A/H 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 SMCJ20AHM3_A/H reliable?
The price and inventory of SMCJ20AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ20AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20AHM3_A/H?
SMCJ20AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20AHM3_A/H 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 SMCJ20AHM3_A/H?
For technical support, including SMCJ20AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20AHM3_A/H requirements.
6.How does Aetrix verify that SMCJ20AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ20AHM3_A/H 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 SMCJ20AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ20AHM3_A/H?
All SMCJ20AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20AHM3_A/H, 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 SMCJ20AHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ20AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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