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Vishay General Semiconductor - Diodes Division SMCJ20CAHM3_A/H
- Part No.:
- SMCJ20CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CAHM3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,536
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Product details
Overview
SMCJ20CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection. It features a 20 V standoff voltage (VWM), 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 to safeguard MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ20CAHM3_A/H datasheet, SMCJ20CAHM3_A/H pinout, SMCJ20CAHM3_A/H application, or SMCJ20CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) under real-world PCB layout constraints.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging an avalanche breakdown mechanism with low incremental surge resistance and <1 ps response time. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-dependent design constraints in AC-coupled or floating signal paths.
Designed for mounting on 8.0 mm × 8.0 mm copper pads per terminal, it delivers rated PPPM only when thermally derated above TA = 25 °C per Fig. 2 - junction temperature must stay ≤150 °C under repetitive surge conditions, supported by RθJL = 15 °C/W to lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.2 V / 24.5 V at IT = 1 mA - guaranteed breakdown threshold range for reliable turn-on |
| VC @ IPPM | 32.4 V at 46.3 A - clamped voltage seen by protected circuit during full-rated surge |
| PPPM | 1500 W - peak transient energy absorption capacity with 10/1000 µs waveform |
| ID @ VWM | 1.0 µA - leakage current level ensuring minimal standby power loss and signal integrity |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
SMCJ20CAHM3_A/H uses the SMC (DO-214AB) package: a two-terminal, non-polarized surface-mount case with no cathode marking (bidirectional configuration). Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically - surge current flows bidirectionally across the junction without polarity dependency |
| Case body | Thermal interface | Direct thermal path to PCB copper pads; requires minimum 8.0 mm × 8.0 mm pad per terminal for rated PPPM |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant | Meets JEDEC JS709E and IPC-1752A material declarations; supports green manufacturing requirements |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH - no baking required prior to reflow assembly |
| Low clamping ratio (VC/VBR) | 1.46 (32.4 V / 22.2 V) - tight voltage margin between breakdown and clamping improves system-level overvoltage margin |
| UL 94 V-0 molding compound | Flame-retardant encapsulation suitable for safety-critical enclosures and high-density PCB layouts |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and ISO 7637-2 Pulse 5a transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed at input filter stage to clamp surges before DC-DC converters and microcontrollers. Use Value: Withstands 1500 W pulses while limiting voltage to 32.4 V - preserving downstream 36 V-rated components without derating. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) bidirectional clamp on differential signal pairs to maintain signal fidelity during EMC testing. Use Value: Sub-33 V clamping prevents ADC saturation and preserves ±10 V input range integrity under IEC 61000-4-2 contact discharge. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Stage |
Use Scenario: Guarding PoE-powered Ethernet PHY interfaces against lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC bus, coordinated with gas discharge tubes for staged protection. Use Value: Fast response (<1 ps) and symmetrical clamping ensure common-mode surge suppression without signal inversion or timing skew. | Use Scenario: Input-stage overvoltage protection in universal-input AC/DC adapters subjected to line surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Standoff-rated (20 V) bidirectional suppressor placed after bridge rectifier to absorb residual AC-line transients. Use Value: Halogen-free construction meets regional environmental mandates while maintaining 1500 W surge rating for 264 VAC input designs. |
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/H | Lower PPPM (400 W), same VWM (20 V), SMA package (smaller footprint, higher RθJA) | Not suitable for 1500 W surge events; limited to lower-energy transients in space-constrained consumer designs | Select when board area is critical and surge threat level is defined per IEC 61000-4-2 Level 3 (8 kV contact) |
| SMCJ20CAHE3_A/H | Same electrical specs and SMC package, but RoHS-compliant without halogen-free certification | Acceptable for commercial/industrial use where halogen-free compliance is not mandated by end-customer or regulatory body | Choose for cost-sensitive programs where AEC-Q101 is unnecessary and halogen content is unrestricted |
Compared with SMCJ20CAHE3_A/H and SMAJ20CAHE3_A/H, the SMCJ20CAHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free materials, and full 1500 W surge capability - making it the only option qualified for under-hood automotive deployment with full environmental compliance.
Availability
SMCJ20CAHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line card surge suppression, and consumer power adapter input stage applications requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ20CAHM3_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, rectifiers, MOSFETs, and protection devices 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 systems where robustness against ISO 7637, IEC 61000-4-5, and ESD threats is mandatory.
FAQ
What is the clamping voltage of SMCJ20CAHM3_A/H at its rated peak pulse current?
The SMCJ20CAHM3_A/H has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 46.3 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures predictable overvoltage limiting for downstream components in the protected circuit - a critical parameter verified during AEC-Q101 qualification testing for the SMCJ20CAHM3_A/H.
Is SMCJ20CAHM3_A/H suitable for automotive applications?
Yes, the SMCJ20CAHM3_A/H is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS modules. Its halogen-free, RoHS-compliant construction, MSL Level 1 rating, and guaranteed operation from –55 °C to +150 °C junction temperature make the SMCJ20CAHM3_A/H compliant with automotive reliability and environmental requirements.
How does the bidirectional configuration of SMCJ20CAHM3_A/H affect circuit design?
The bidirectional configuration of SMCJ20CAHM3_A/H eliminates polarity sensitivity, allowing placement across AC-coupled signals, differential buses, or floating power rails without orientation concerns. Unlike unidirectional TVS diodes, the SMCJ20CAHM3_A/H provides identical clamping in both directions - simplifying layout, reducing BOM count, and avoiding reverse-connection failures in high-volume manufacturing.
What is the thermal resistance of SMCJ20CAHM3_A/H, and how does it impact PCB layout?
The SMCJ20CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To achieve full 1500 W surge rating, the PCB must implement this minimum pad size - undersized pads increase thermal impedance, causing junction overheating and potential failure during repetitive surges. The SMCJ20CAHM3_A/H datasheet specifies this layout requirement explicitly in Fig. 2 derating curves.
Does SMCJ20CAHM3_A/H require special handling or moisture sensitivity precautions?
No - the SMCJ20CAHM3_A/H is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/85 % RH and requires no dry-packaging or baking prior to reflow soldering. Its glass passivated chip junction and UL 94 V-0 molding compound further enhance robustness during standard SMT assembly - a key reliability feature confirmed in the official Vishay documentation for the SMCJ20CAHM3_A/H.
SMCJ20CAHM3_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:
- -
- 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/H FAQ
1.How can I place an order for SMCJ20CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CAHM3_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 SMCJ20CAHM3_A/H reliable?
The price and inventory of SMCJ20CAHM3_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 SMCJ20CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ20CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CAHM3_A/H?
SMCJ20CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CAHM3_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 SMCJ20CAHM3_A/H?
For technical support, including SMCJ20CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ20CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ20CAHM3_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 SMCJ20CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ20CAHM3_A/H?
All SMCJ20CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CAHM3_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 SMCJ20CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ20CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20CAHM3_A/H Tags
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