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Vishay General Semiconductor - Diodes Division SMCJ70CAHM3_A/H
- Part No.:
- SMCJ70CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CAHM3_A/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,665
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Product details
Overview
SMCJ70CAHM3_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 on power and signal lines. It features a 70 V stand-off voltage (VWM), 113 V maximum clamping voltage (VC) at 13.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive power supply rails and industrial sensor interfaces.
For engineers reviewing the SMCJ70CAHM3_A/H datasheet, SMCJ70CAHM3_A/H pinout, SMCJ70CAHM3_A/H application, or SMCJ70CAHM3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) under PCB pad-limited conduction.
Technical Context
This device operates as a voltage-clamped crowbar during transient overvoltage events, leveraging an avalanche breakdown mechanism to shunt surge current away from protected circuitry. Its bidirectional architecture ensures symmetrical clamping in both polarities without polarity marking, and its glass-passivated junction enables stable breakdown characteristics across temperature.
The SMCJ70CAHM3_A/H is rated for -55 °C to +150 °C operating junction temperature, with derated peak pulse power above 25 °C per Fig. 2 of the datasheet. It meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance, supporting lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR min/max | 77.8 V / 86.0 V at IT = 1 mA - Confirmed breakdown voltage range ensuring predictable turn-on threshold. |
| VC @ IPPM | 113 V at 13.3 A - Clamping voltage under standardized 10/1000 μs surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity design. |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; low value minimizes quiescent power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with minimal derating. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; guides PCB thermal layout. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional - no polarity marking; symmetric two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path terminal | Both terminals function identically; connected across protected line and ground (or rail-to-rail); no cathode band or polarity identifier. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control and ADAS power domains. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and full RoHS compliance - satisfies EU ELV and OEM environmental mandates. |
| Low incremental surge resistance | Enables tight VC/VBR ratio (113 V / 77.8 V ≈ 1.45), minimizing let-through voltage during fast transients like load dump. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT assembly for high-volume automotive production. |
| 1500 W peak pulse rating | Supports robust protection against ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 combination wave surges without derating. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery-fed ECU power input subjected to ISO 7637-2 load dump transients up to 60 V for 400 ms. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VBAT and GND to clamp overvoltage before it reaches DC/DC converter input. Use Value: 113 V clamping voltage ensures downstream regulators remain within absolute maximum ratings during 60 V/400 ms load dump events. |
Use Scenario: RS-485 communication lines in factory automation PLCs exposed to EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground TVS pair protecting differential bus nodes from ±1 kV EFT (IEC 61000-4-4). Use Value: Symmetrical bidirectional clamping maintains signal integrity on differential pairs without polarity-dependent misalignment. |
| Telecom AC/DC Adapter Input | Consumer Appliance Motor Drive Supply |
Use Scenario: Secondary-side DC output of isolated AC/DC adapter subjected to surge coupling from primary-side transients. IC Role / Device Role / Timing Role: TVS mounted across +VOUT and GND to suppress coupled surges before reaching LDO or microcontroller power pins. Use Value: 1.0 μA leakage at 70 V minimizes standby current drain in always-on smart home adapters. |
Use Scenario: Brushed DC motor drive supply in washing machine control board experiencing commutation spikes up to 100 V. IC Role / Device Role / Timing Role: TVS placed across motor terminals to absorb inductive kickback energy and prevent MOSFET avalanche failure. Use Value: 1500 W PPPM rating handles repetitive 50–100 A spike currents typical of high-torque motor startup/stall conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CAHE3_A/H | Lower PPPM (400 W), same VWM (70 V), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy transients like ESD or EFT. | Select when space-constrained layouts prioritize size over surge energy handling. |
| SMCJ70CAHE3_A/H | Same electrical specs and SMC package, but RoHS-compliant without halogen-free compound (E3 vs HM3) | Acceptable for commercial/industrial use where halogen-free mandate does not apply (e.g., non-automotive OEMs). | Select when AEC-Q101 is unnecessary and halogen-free requirement is waived. |
Compared with SMAJ70CAHE3_A/H and SMCJ70CAHE3_A/H, the SMCJ70CAHM3_A/H uniquely combines automotive qualification, halogen-free compliance, and full 1500 W surge capacity in the SMC footprint - making it the only option meeting Tier-1 automotive power rail requirements without layout or reliability compromise.
Availability
SMCJ70CAHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial PLC I/O protection, and telecom power supply designs requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for SMCJ70CAHM3_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, and protection devices with emphasis on reliability, efficiency, and automotive-grade validation.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the SMCJ70CAHM3_A/H under a 10/1000 μs surge?
The SMCJ70CAHM3_A/H has a maximum clamping voltage (VC) of 113 V when subjected to its rated peak pulse current of 13.3 A using the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMCJ70CAHM3_A/H achieves this with a VC/VBR ratio of approximately 1.45, reflecting low incremental surge resistance.
Is the SMCJ70CAHM3_A/H suitable for automotive applications?
Yes, the SMCJ70CAHM3_A/H is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's SMCJ5.0A–SMCJ188CA datasheet (Rev. 09-Jan-2024). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD - making it approved for under-hood and body-control module applications. The SMCJ70CAHM3_A/H also meets J-STD-020 MSL Level 1, supporting lead-free reflow without preconditioning.
How does the SMCJ70CAHM3_A/H differ from unidirectional SMCJ70A variants?
The SMCJ70CAHM3_A/H is bidirectional, meaning it provides symmetrical clamping in both polarities with no cathode marking, whereas unidirectional SMCJ70A types feature a cathode band and conduct only in reverse bias. Electrically, the SMCJ70CAHM3_A/H has identical VWM (70 V), VBR (77.8–86.0 V), and PPPM (1500 W) ratings but lacks polarity dependence - enabling use in AC-coupled lines or differential buses where voltage reversal occurs. Its bidirectional nature eliminates orientation errors during automated placement.
What is the thermal resistance of the SMCJ70CAHM3_A/H, and how does it affect PCB layout?
The SMCJ70CAHM3_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 specified in the datasheet. This value directly impacts thermal performance: for example, at 6.5 W steady-state dissipation, junction temperature rise would be ~488 °C - underscoring that RθJA applies only to transient surge conditions, not continuous operation. For reliable surge handling, PCB layout must replicate the recommended pad dimensions to maintain specified PPPM derating curves.
Does the SMCJ70CAHM3_A/H have halogen-free construction?
Yes, the "HM3" suffix in SMCJ70CAHM3_A/H explicitly denotes halogen-free, RoHS-compliant construction per Vishay's ordering nomenclature. This includes halogen-free molding compound and matte tin-plated leads compliant with J-STD-002 and JESD22-B102. The material categorization aligns with Vishay Doc. #99912, satisfying strict environmental requirements for automotive and consumer electronics - distinguishing it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) variants.
SMCJ70CAHM3_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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 13.3A
- 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)
SMCJ70CAHM3_A/H FAQ
1.How can I place an order for SMCJ70CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CAHM3_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 SMCJ70CAHM3_A/H reliable?
The price and inventory of SMCJ70CAHM3_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 SMCJ70CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ70CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CAHM3_A/H?
SMCJ70CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CAHM3_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 SMCJ70CAHM3_A/H?
For technical support, including SMCJ70CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ70CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ70CAHM3_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 SMCJ70CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ70CAHM3_A/H?
All SMCJ70CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CAHM3_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 SMCJ70CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ70CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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