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Vishay General Semiconductor - Diodes Division SMCJ20AHM3_A/I
- Part No.:
- SMCJ20AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20AHM3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
SMCJ20AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection of DC power rails and signal lines. It features a 20 V stand-off voltage (VWM), 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 ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ20AHM3_A/I datasheet, SMCJ20AHM3_A/I pinout, SMCJ20AHM3_A/I application, or SMCJ20AHM3_A/I equivalent, key selection criteria include clamping performance under 46.3 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ20AHM3_A/I uses a glass-passivated silicon junction to achieve fast response time (<1 ns) and low incremental surge resistance, enabling effective suppression of ESD, lightning-induced transients, and inductive switching spikes. Its unidirectional polarity (cathode-banded) supports DC-biased protection paths without reverse conduction during normal operation.
Rated for TJ = -55 °C to +150 °C and qualified to AEC-Q101, the device operates with 1.0 μA max reverse leakage at VWM and exhibits a positive temperature coefficient of breakdown voltage (+0.094 %/°C), ensuring stable clamping behavior across automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected line. |
| VBR min/max | 22.2 V / 24.5 V at IT = 1.0 mA - Confirmed breakdown threshold range ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 46.3 A (10/1000 μs) - Clamping voltage limits downstream IC stress; enables protection of 24 V systems with adequate margin. |
| PPPM | 1500 W - Peak surge energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) compliance when properly laid out. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; requires minimum 8.0 mm × 8.0 mm copper pad per terminal for rated power dissipation. |
| TJ max | +150 °C - Maximum junction temperature; validated for under-hood automotive environments and industrial enclosures. |
| Compliance | AEC-Q101 qualified, halogen-free, RoHS-compliant (HM3 suffix) - Meets automotive reliability and environmental requirements. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, MSL Level 1 (260 °C peak reflow). Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connects to protected line; conducts surge current to ground during overvoltage event. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports robust protection against IEC 61000-4-5 surges up to 4 kV in 2 Ω/42 Ω source impedance configurations. |
| 32.4 V clamping at 46.3 A | Enables safe operation of 24 V-rated components (e.g., CAN transceivers, microcontrollers) during transient events. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3) | Fulfills strict environmental mandates for global OEM supply chains and industrial equipment certifications. |
| Low-profile SMC package | Enables high-density PCB layouts while maintaining thermal performance via standardized 8.0 mm × 8.0 mm pad design. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed MCU power inputs in engine control units exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between VCC and GND, activated within <1 ns of overvoltage onset. Use Value: Limits voltage to ≤32.4 V during 46.3 A surges, preventing latch-up or permanent damage to 24 V-tolerant MCUs and PMICs. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers subjected to field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on optocoupler input side, absorbing inductive kickback from solenoid/relay coils. Use Value: Maintains signal integrity by clamping transients before they reach isolation barriers, reducing false triggering and component wear. |
| Telecom DC Power Supply Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding 24–48 V DC-DC converter outputs in base station power modules from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated output rail, coordinated with upstream MOVs and common-mode chokes. Use Value: Provides precise, low-leakage (1.0 μA) clamping that avoids loading regulation circuitry during normal operation. |
Use Scenario: Suppressing commutation spikes on 24 V motor driver H-bridge supply rails in smart home appliances (e.g., washing machine pumps). IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used across VDD/GND to absorb flyback energy from brushed DC motors. Use Value: Withstands repeated 8.3 ms half-sine surges up to 200 A (IFSM), extending driver IC lifetime in cyclic load environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3_A/H | Lower PPPM (400 W), same VWM (20 V), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained consumer designs with lower surge exposure; not AEC-Q101 qualified | Select when board area is critical and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ20AHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (E3) - no halogen-free requirement, no AEC-Q101 qualification | Applicable in non-automotive industrial or computing systems where halogen-free mandate does not apply | Choose for cost-sensitive BOMs where AEC-Q101 and halogen-free are not required. |
Compared with SMCJ20AHM3_A/I, SMAJ20AHE3_A/H offers reduced surge capability and thermal performance in a smaller package, while SMCJ20AHE3_A/I retains identical protection ratings but lacks automotive qualification and halogen-free construction - making SMCJ20AHM3_A/I the sole choice for AEC-Q101-compliant, environmentally restricted automotive deployments.
Availability
SMCJ20AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMCJ20AHM3_A/I 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, rectifiers, MOSFETs, and protection devices 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 - targeting automotive, industrial, and telecom infrastructure where robustness and qualification compliance are mandatory.
FAQ
What is the clamping voltage of the SMCJ20AHM3_A/I under maximum rated surge current?
The SMCJ20AHM3_A/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 46.3 A with a 10/1000 μs waveform. This value is measured at the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ20AHM3_A/I maintains this clamping performance across its operational temperature range and is validated per JEDEC and IEC standards.
Is the SMCJ20AHM3_A/I qualified for automotive applications?
Yes, the SMCJ20AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_A/I", where "H" denotes AEC-Q101 qualification and "M3" indicates halogen-free RoHS compliance. This qualification covers stress tests including HTGB, AC/DC life test, temperature cycling, and mechanical shock - making the SMCJ20AHM3_A/I suitable for under-hood and chassis-mounted automotive electronics such as body control modules and ADAS sensor interfaces.
What is the thermal resistance and recommended PCB layout for the SMCJ20AHM3_A/I?
The SMCJ20AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W, which assumes mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To achieve rated power dissipation and avoid thermal derating, designers must implement these minimum pad dimensions with solid internal ground/power planes and avoid excessive trace length or narrow connections. The SMCJ20AHM3_A/I's RθJL is 15 °C/W, confirming efficient heat transfer to PCB copper.
How does the SMCJ20AHM3_A/I differ from the SMCJ20AHE3_A/I variant?
The SMCJ20AHM3_A/I differs from SMCJ20AHE3_A/I in two key aspects: it carries the HM3 suffix indicating halogen-free construction and AEC-Q101 qualification, whereas the HE3 suffix denotes RoHS-compliant commercial grade without automotive qualification or halogen-free assurance. Both share identical electrical parameters (VWM = 20 V, VC = 32.4 V, PPPM = 1500 W), but only the SMCJ20AHM3_A/I meets automotive OEM material and reliability requirements.
What is the reverse leakage current specification for the SMCJ20AHM3_A/I at rated stand-off voltage?
The SMCJ20AHM3_A/I specifies a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 20 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss and signal interference in always-on circuits such as automotive wake-up lines or industrial sensor bias networks. Leakage remains within specification up to +85 °C, with gradual increase governed by junction temperature and device physics - fully characterized in Vishay's official datasheet revision 09-Jan-2024.
SMCJ20AHM3_A/I 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/I FAQ
1.How can I place an order for SMCJ20AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20AHM3_A/I 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/I reliable?
The price and inventory of SMCJ20AHM3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMCJ20AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20AHM3_A/I?
SMCJ20AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20AHM3_A/I 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/I?
For technical support, including SMCJ20AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ20AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ20AHM3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMCJ20AHM3_A/I?
All SMCJ20AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20AHM3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMCJ20AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20AHM3_A/I Tags
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