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Vishay General Semiconductor - Diodes Division SMCJ40CAHM3/I
- Part No.:
- SMCJ40CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CAHM3/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,186
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Product details
Overview
SMCJ40CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 40 V standoff voltage (VWM), 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ40CAHM3/I datasheet, SMCJ40CAHM3/I pinout, SMCJ40CAHM3/I application, or SMCJ40CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), 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: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), but triggers into low-impedance conduction when transient voltage exceeds its breakdown range (44.4–49.1 V at 1 mA). Its glass-passivated junction ensures stable avalanche characteristics and fast response (<1 ns).
The SMCJ40CAHM3/I is rated for -55 °C to +150 °C operating junction temperature, supports 200 A unidirectional surge current (IFSM), and meets J-STD-020 MSL Level 1 with 260 °C reflow peak - confirming suitability for high-reliability surface-mount assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse working voltage before clamping initiates |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - guaranteed symmetric breakdown threshold in both directions |
| VC @ IPPM | 64.5 V at 23.3 A - clamping voltage limits downstream IC stress during 10/1000 μs transients |
| PPPM | 1500 W - peak pulse power handling capability per standard 10/1000 μs waveform |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, defining derating above 25 °C |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
SMCJ40CAHM3/I uses a 2-terminal SMC (DO-214AB) package with no polarity marking - consistent with bidirectional functionality. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker test requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides symmetrical conduction path for positive or negative surges relative to cathode |
| Cathode | Transient return path (bidirectional) | Functions identically to anode - no polarity distinction; both terminals serve as interchangeable surge shunt nodes |
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 (HM3) | Meets environmental compliance requirements for green manufacturing and end-of-life disposal |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.45) and lower let-through energy during fast transients |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak without baking |
| Glass passivated junction | Ensures stable, repeatable avalanche behavior across lifetime and temperature extremes |
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 ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt clamping device placed directly at connector entry point to divert surge energy before reaching signal conditioning circuitry. Use Value: Maintains 40 V system rail integrity while limiting transient overshoot to ≤64.5 V, preventing damage to 5 V or 3.3 V interface ICs. | Use Scenario: Safeguarding digital input/output channels in programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across isolated field-side signal lines to absorb repetitive 1 kV/500 A transients. Use Value: Enables >100,000 surge cycles without parameter drift due to stable glass-passivated junction and 1500 W PPPM rating. |
| Telecom Power Supply Protection | Consumer Device USB Port Protection |
Use Scenario: Secondary-side overvoltage suppression on 48 V DC distribution rails in base station power systems subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on output stage to clamp transients exceeding 40 V while coordinating with upstream fuses and MOVs. Use Value: Delivers 64.5 V clamping at 23.3 A with <1 ns response, reducing risk of MOSFET gate oxide failure in DC-DC controllers. | Use Scenario: Protecting USB 2.0 data lines and VBUS pins in portable electronics against ESD events per IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed adjacent to connector to minimize signal distortion on differential pairs. Use Value: Provides symmetrical clamping without polarity constraints, simplifying layout and eliminating need for dual unidirectional devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CAHM3/I | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VC specs | Reduced surge handling for space-constrained consumer designs where 1500 W is excessive | Select when board area is critical and peak transients are ≤600 W |
| SMCJ40AHE3/I | Unidirectional version, identical VWM/VC/PPPM, AEC-Q101 qualified, RoHS-compliant (E3 suffix) | Required where polarity-aware clamping is needed (e.g., DC supply rails with defined ground reference) | Select only if circuit topology mandates unidirectional conduction path |
Compared with SMCJ40CAHM3/I, SMBJ40CAHM3/I trades surge capacity for compactness, while SMCJ40AHE3/I offers identical protection strength but lacks bidirectional symmetry - making SMCJ40CAHM3/I optimal for floating or AC-coupled signal lines where polarity reversal is possible.
Availability
SMCJ40CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom power supply protection requiring stable component supply across extended production lifecycles.
Supply support for SMCJ40CAHM3/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 and automotive qualification.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting AEC-Q101 compliance, robust thermal performance, and consistent clamping behavior across temperature and lifetime.
FAQ
What does the 'HM3' suffix indicate in SMCJ40CAHM3/I?
The HM3 suffix in SMCJ40CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with JEDEC JESD201 Class 2 whisker resistance, J-STD-020 MSL Level 1 reflow rating (260 °C peak), and material restrictions per Vishay's green initiative. This makes SMCJ40CAHM3/I suitable for automotive and industrial applications requiring strict environmental and reliability standards.
Is SMCJ40CAHM3/I truly bidirectional, and how is that verified?
Yes, SMCJ40CAHM3/I is fully bidirectional: its electrical characteristics - including VBR (44.4–49.1 V), VC (64.5 V), and ID (≤1.0 μA) - apply identically in both directions, as confirmed in the Vishay datasheet Document Number 88394, Section "Electrical Characteristics". Unlike unidirectional variants, it carries no cathode band marking and exhibits symmetric clamping behavior essential for protecting AC-coupled or floating signal paths.
How does the 1500 W PPPM rating of SMCJ40CAHM3/I translate to real-world surge immunity?
The 1500 W PPPM rating of SMCJ40CAHM3/I corresponds to its ability to safely absorb a single 10/1000 μs transient event delivering up to 23.3 A at 64.5 V. When mounted on 8.0 mm × 8.0 mm copper pads per datasheet Fig. 2, this enables protection against ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave (1.2/50 μs voltage, 8/20 μs current) surges common in automotive and industrial settings - provided layout minimizes parasitic inductance.
Can SMCJ40CAHM3/I replace a unidirectional TVS like SMCJ40AHE3/I in the same PCB footprint?
No - although SMCJ40CAHM3/I shares the same SMC (DO-214AB) package and pin count as SMCJ40AHE3/I, it cannot be used as a drop-in replacement without circuit review. The unidirectional SMCJ40AHE3/I requires correct polarity orientation (cathode band aligned), whereas SMCJ40CAHM3/I has no polarity marking and conducts equally in both directions. Swapping may cause unintended conduction paths or fail to suppress polarity-specific transients.
What is the maximum operating temperature for SMCJ40CAHM3/I, and how does derating work above 25 °C?
The maximum junction temperature for SMCJ40CAHM3/I is +150 °C, with thermal resistance RθJA = 75 °C/W. Above TA = 25 °C, its peak pulse power must be linearly derated: for example, at 85 °C ambient, usable PPPM drops to ~900 W (per Fig. 2 in datasheet 88394). This derating ensures safe operation under sustained high-temperature conditions typical in engine control units or enclosed industrial enclosures.
SMCJ40CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 23.3A
- 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)
SMCJ40CAHM3/I FAQ
1.How can I place an order for SMCJ40CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CAHM3/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 SMCJ40CAHM3/I reliable?
The price and inventory of SMCJ40CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ40CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CAHM3/I?
SMCJ40CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CAHM3/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 SMCJ40CAHM3/I?
For technical support, including SMCJ40CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CAHM3/I requirements.
6.How does Aetrix verify that SMCJ40CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ40CAHM3/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 SMCJ40CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ40CAHM3/I?
All SMCJ40CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CAHM3/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 SMCJ40CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ40CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CAHM3/I Tags
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