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Vishay General Semiconductor - Diodes Division SMCJ20CAHM3_A/I
- Part No.:
- SMCJ20CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CAHM3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ20CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 20 V standoff 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 across automotive sensor lines, industrial I/O ports, and telecom interface circuits.
For engineers reviewing the SMCJ20CAHM3_A/I datasheet, SMCJ20CAHM3_A/I pinout, SMCJ20CAHM3_A/I application, or SMCJ20CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive switching or ESD events. Its bidirectional architecture ensures symmetrical clamping in both polarities, with breakdown voltage (VBR) specified between 22.2 V and 24.5 V at 1.0 mA test current and temperature coefficient of 0.094 %/°C.
It is rated for continuous operation from −55 °C to +150 °C junction temperature, supports 200 A non-repetitive forward surge (IFSM) only in unidirectional variants (not applicable here), and exhibits low incremental surge resistance - critical for minimizing let-through energy during fast-rising transients like ISO 7637-2 Pulse 1/2a/5a.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum reverse working voltage before clamping begins; defines safe operating margin below system rail. |
| VBR min/max | 22.2 V / 24.5 V at 1.0 mA - Ensures reliable turn-on above normal operating voltage while avoiding false triggering. |
| VC @ IPPM | 32.4 V at 46.3 A - Clamped voltage seen by protected IC during 1500 W transient; determines downstream device survivability. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform; validates immunity to severe load-dump or lightning-induced surges. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-ambient industrial enclosures without derating. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard PCB pad layout; informs heatsinking requirements. |
| Package | SMC (DO-214AB) - Surface-mount outline with 8.13 mm × 6.22 mm footprint and 2.62 mm height; compatible with J-STD-020 MSL Level 1. |
Pinout & Package
SMCJ20CAHM3_A/I is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode and Anode. As a bidirectional device, it has no polarity marking - both terminals are functionally symmetric and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode | Terminal A | One side of the back-to-back PN junction pair; electrically identical to Anode in bidirectional operation. |
| Anode | Terminal B | Second side of the dual-junction structure; enables symmetrical clamping regardless of voltage polarity applied. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-20 MSL Level 1 - supports green manufacturing and high-reliability reflow profiles up to 260 °C peak. |
| Low clamping ratio (VC/VBR) | ~1.42 - Minimizes overvoltage stress on protected ICs compared to higher-ratio alternatives, preserving signal integrity. |
| Fast response time | < 1 ps - Limits transient energy delivery before downstream components experience overstress, critical for high-speed data lines. |
| UL 497B recognized | QVGQ2 file E136766 - Confirms suitability for telecom and industrial safety-critical surge protection applications per Underwriters Laboratories. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp spikes before reaching signal conditioning circuitry. Use Value: Withstands 1500 W pulses and maintains clamping below 32.4 V - ensuring ASIL-B compliant sensors remain functional after ISO 16750-2 Pulse 5a events. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges and ground loop transients. IC Role / Device Role / Timing Role: Bidirectional clamping element across 24 V DC input lines to absorb negative and positive polarity transients equally. Use Value: Symmetrical VBR and VC ensure consistent protection regardless of transient polarity - eliminating need for dual unidirectional devices. |
| Telecom Interface Protection | Consumer Power Adapter ESD Guard |
Use Scenario: Shielding Ethernet PHY interfaces, RS-485 transceivers, and PoE injectors from lightning-induced surges and induced noise in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary-level TVS placed upstream of common-mode chokes and secondary protection ICs to divert bulk surge energy. Use Value: 1500 W PPPM rating handles IEC 61000-4-5 Level 4 (4 kV) surges - reducing failure rate in harsh outdoor deployments. | Use Scenario: Adding secondary surge suppression on AC/DC adapter output rails to meet IEC 61000-4-2 ESD immunity requirements for USB-C and barrel jack outputs. IC Role / Device Role / Timing Role: Final-stage clamping device after primary MOV and filter stage - limits residual overshoot to sub-35 V levels. Use Value: Low VC of 32.4 V prevents latch-up in downstream DC-DC controllers and LDOs rated for ≤ 36 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CAHE3_A/I | Lower PPPM (400 W), smaller SMA package, same VWM/VC specs. | Not suitable for high-energy transients like load dump; limited to consumer-grade ESD and low-energy surges. | Select when board space is constrained and surge threat level is ≤ IEC 61000-4-2 Level 3. |
| SMCJ20AHE3_A/I | Unidirectional variant; cathode band marking; identical VWM, VBR, VC, and PPPM. | Requires correct polarity orientation; unsuitable for AC-coupled or floating signal lines where bidirectional clamping is mandatory. | Choose only for DC-biased rails where polarity is fixed and reverse conduction must be blocked. |
Compared with SMAJ20CAHE3_A/I and SMCJ20AHE3_A/I, the SMCJ20CAHM3_A/I delivers full 1500 W bidirectional surge immunity in a halogen-free, AEC-Q101 qualified package - making it the sole option meeting automotive and industrial high-energy transient standards without design compromise.
Availability
SMCJ20CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor systems, industrial PLC I/O modules, telecom interface protection, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ20CAHM3_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 engineered for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against repetitive and catastrophic surges is mission-critical.
FAQ
What does the "CA" suffix indicate in SMCJ20CAHM3_A/I?
The "CA" suffix in SMCJ20CAHM3_A/I denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage suppression for both positive and negative polarity transients. Unlike unidirectional variants (e.g., SMCJ20A), it contains two back-to-back avalanche diodes and carries no polarity marking, enabling use in AC-coupled or floating signal paths without orientation concerns. This is confirmed in Vishay's SMCJ5.0A–SMCJ188CA datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
Is SMCJ20CAHM3_A/I qualified for automotive applications?
Yes, SMCJ20CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). The datasheet explicitly states that HM3 variants meet AEC-Q101 requirements, including stress tests for temperature cycling, high-temperature reverse bias, and ESD. This makes SMCJ20CAHM3_A/I suitable for under-hood and chassis-mounted automotive electronics such as body control modules and ADAS sensor interfaces.
What is the maximum clamping voltage of SMCJ20CAHM3_A/I and at what current is it specified?
The maximum clamping voltage (VC) of SMCJ20CAHM3_A/I is 32.4 V, measured at a peak pulse current (IPPM) of 46.3 A using the standardized 10/1000 µs double-exponential waveform. This value is extracted directly from the "ELECTRICAL CHARACTERISTICS" table in the Vishay datasheet (Document Number: 88394, Revision: 09-Jan-2024) under the row for SMCJ20CA. It represents the worst-case voltage imposed on protected circuitry during a full-rated surge event.
How does the SMC (DO-214AB) package of SMCJ20CAHM3_A/I impact PCB layout?
The SMC (DO-214AB) package of SMCJ20CAHM3_A/I requires a minimum pad layout of 0.31" × 0.31" (8.0 mm × 8.0 mm) copper area per terminal to achieve rated thermal and surge performance. Its 2.62 mm height and 8.13 mm × 6.22 mm footprint support automated placement and reflow, and its MSL Level 1 rating allows exposure to ambient conditions indefinitely before soldering. No polarity marking simplifies layout - but thermal relief and copper pour must be symmetrical to maintain bidirectional thermal balance.
Does SMCJ20CAHM3_A/I meet UL safety certification requirements?
Yes, SMCJ20CAHM3_A/I is UL 497B recognized under file number E136766 for both unidirectional and bidirectional configurations, as stated in the Vishay datasheet footnote (+). This certification validates its use in telecommunications and industrial equipment requiring third-party safety approval for surge protection components. The device meets the classification requirements for protectors per UL 497B, covering both uni- and bi-directional types without distinction.
SMCJ20CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ20CAHM3_A/I FAQ
1.How can I place an order for SMCJ20CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CAHM3_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 SMCJ20CAHM3_A/I reliable?
The price and inventory of SMCJ20CAHM3_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 SMCJ20CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ20CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CAHM3_A/I?
SMCJ20CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CAHM3_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 SMCJ20CAHM3_A/I?
For technical support, including SMCJ20CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ20CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ20CAHM3_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 SMCJ20CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ20CAHM3_A/I?
All SMCJ20CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CAHM3_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 SMCJ20CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ20CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20CAHM3_A/I Tags
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