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Vishay General Semiconductor - Diodes Division SMCJ40CAHM3_A/H
- Part No.:
- SMCJ40CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CAHM3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,224
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Product details
Overview
SMCJ40CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount 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 and industrial I/O modules.
For engineers reviewing the SMCJ40CAHM3_A/H datasheet, SMCJ40CAHM3_A/H pinout, SMCJ40CAHM3_A/H application, or SMCJ40CAHM3_A/H 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 junction temperature range (–55 to +150 °C).
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with identical electrical characteristics in both directions due to its bidirectional construction. It responds within picoseconds to transients and maintains low incremental surge resistance to limit let-through energy during ESD or load-switching events.
Designed for surface-mount assembly on standard PCB copper pads (8.0 mm × 8.0 mm per terminal), it meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak. Its glass-passivated junction ensures stable breakdown behavior across temperature and lifetime.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36–42 V nominal rails. |
| VBR min / max | 44.4 V / 49.1 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold under transient stress. |
| VC @ IPPM | 64.5 V - Clamped voltage seen by protected circuit at 23.3 A peak pulse; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capability with 10/1000 μs waveform; enables protection against severe ISO 7637-2 Pulse 5a/b surges. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments and high-ambient industrial settings. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs derating requirements above 25 °C ambient. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| Package | SMC (DO-214AB) - Industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ40CAHM3_A/H uses a 2-terminal SMC (DO-214AB) package with no polarity marking - consistent with bidirectional TVS construction. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (either direction) | Accepts surge current during positive or negative voltage excursions; symmetric conduction path enables bidirectional clamping. |
| Cathode | Transient current exit point (either direction) | Completes low-impedance path to ground or return rail during clamping; no functional distinction from Anode in bidirectional configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both polarities - eliminates need for orientation-aware placement and simplifies layout for AC-coupled or floating lines. |
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements - enables use in ADAS camera modules, body control units, and infotainment power supplies. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates without compromising surge robustness - suitable for global OEM supply chains with strict material restrictions. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes let-through overvoltage relative to breakdown threshold - enhances protection margin for 3.3 V, 5 V, and 12 V logic interfaces. |
| MSL Level 1 rating | Unlimited floor life and compatibility with standard reflow profiles up to 260 °C - supports high-yield manufacturing without baking or special handling. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, absorbing energy from ±100 V transients while maintaining signal integrity. Use Value: Prevents latch-up or permanent damage to precision op-amps and ADCs by limiting excursion to ≤64.5 V during 1500 W surges. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff protector mounted directly at connector entry point, shunting induced spikes before they reach isolation amplifiers or ADC drivers. Use Value: Enables reliable operation under IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity testing up to 2 kV line-to-ground. |
| Telecom Power Rail Protection | Consumer USB Port ESD Guard |
|
Use Scenario: Securing 48 V DC power distribution in PoE-powered network switches and base station RF modules against lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on intermediate bus, coordinated with upstream fuses and downstream POL converters. Use Value: Withstands repetitive 1500 W pulses without degradation, supporting long-term reliability in outdoor telecom enclosures. |
Use Scenario: Adding secondary-level ESD protection on USB 2.0 data lines (D+/D−) and VBUS in smart home hubs and portable audio devices. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical) bidirectional clamp placed after primary common-mode choke to suppress contact discharge per IEC 61000-4-2. Use Value: Limits ESD-induced voltage to <65 V at 8 kV contact discharge, preventing bit errors and PHY layer resets without signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CAHE3_A/H | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Restricted to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5 or IEC 61000-4-5 Level 3+ | Select when board space is constrained and surge threat level is limited to ESD/EFT only. |
| SMCJ40AHE3_A/H | Unidirectional variant; cathode band marking; same VWM/VC/PPPM but asymmetric conduction | Requires correct polarity orientation; not usable on AC or floating signals without external biasing | Choose only for DC rails where polarity is fixed and grounding topology permits unidirectional clamping. |
Compared with SMAJ40CAHE3_A/H and SMCJ40AHE3_A/H, the SMCJ40CAHM3_A/H delivers higher surge robustness in a thermally superior package while meeting automotive qualification and halogen-free requirements - making it the preferred choice for mission-critical 40 V rail protection where reliability and regulatory compliance are mandatory.
Availability
SMCJ40CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial I/O module production, and telecom power system development requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ40CAHM3_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, efficiency, and application-specific optimization.
The SMCJ series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure - engineered for ruggedized performance under extreme thermal and electrical stress without sacrificing manufacturability.
FAQ
What does the "CA" suffix indicate in SMCJ40CAHM3_A/H?
The "CA" suffix denotes a bidirectional configuration - meaning the SMCJ40CAHM3_A/H provides symmetrical clamping behavior for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SMCJ40A), it has no polarity marking and functions identically regardless of voltage polarity applied across its terminals, making it ideal for AC-coupled or floating signal lines.
Is SMCJ40CAHM3_A/H qualified for automotive applications?
Yes, SMCJ40CAHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix) and documentation. This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD - validating its suitability for under-hood and cabin-mounted automotive electronics such as sensor interfaces and body control modules.
How does the HM3 suffix differ from M3 or HE3 in SMCJ40CAHM3_A/H?
The HM3 suffix indicates halogen-free, RoHS-compliant construction *and* AEC-Q101 qualification - distinguishing it from M3 (halogen-free/RoHS but commercial grade) and HE3 (RoHS-compliant/AEC-Q101 but not halogen-free). For SMCJ40CAHM3_A/H, HM3 confirms full compliance with both environmental and automotive reliability standards in a single part number.
What is the maximum clamping voltage of SMCJ40CAHM3_A/H at rated surge current?
The SMCJ40CAHM3_A/H has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 23.3 A, measured with a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is critical for ensuring downstream ICs remain within absolute maximum ratings.
Can SMCJ40CAHM3_A/H be used in place of a unidirectional TVS like SMCJ40AHE3_A/H?
No - SMCJ40CAHM3_A/H is not a direct replacement for unidirectional parts like SMCJ40AHE3_A/H in circuits requiring polarity-sensitive clamping. While both share identical VWM and PPPM, the bidirectional nature of SMCJ40CAHM3_A/H means it conducts on both polarities, which may interfere with DC biasing or cause unintended current paths in unidirectionally biased rails.
SMCJ40CAHM3_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):
- 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_A/H FAQ
1.How can I place an order for SMCJ40CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CAHM3_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 SMCJ40CAHM3_A/H reliable?
The price and inventory of SMCJ40CAHM3_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 SMCJ40CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ40CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CAHM3_A/H?
SMCJ40CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CAHM3_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 SMCJ40CAHM3_A/H?
For technical support, including SMCJ40CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ40CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ40CAHM3_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 SMCJ40CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ40CAHM3_A/H?
All SMCJ40CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CAHM3_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 SMCJ40CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ40CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CAHM3_A/H Tags
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