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Vishay General Semiconductor - Diodes Division SMCJ40AHM3_A/I
- Part No.:
- SMCJ40AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40AHM3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,244
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Product details
Overview
SMCJ40AHM3_A/I from Vishay General Semiconductor is a unidirectional 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 stand-off 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 ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ40AHM3_A/I datasheet, SMCJ40AHM3_A/I pinout, SMCJ40AHM3_A/I application, or SMCJ40AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low incremental surge resistance, and verified clamping performance under repetitive transients per IEC 61000-4-5.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 40 V reverse stand-off voltage and rapidly transitions to low-impedance conduction above its 44.4–49.1 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling suppression of ESD, lightning-induced surges, and inductive switching spikes.
Thermally, it sustains 150 °C maximum junction temperature with RθJA = 75 °C/W and RθJL = 15 °C/W, and is rated for 200 A non-repetitive forward surge (IFSM, 8.3 ms half-sine). The HM3 suffix confirms halogen-free, RoHS-compliant, commercial-grade construction meeting JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 64.5 V at 23.3 A - Clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 1500 W - Peak transient energy absorption capability per single event |
| ID @ VWM | ≤1.0 μA - Ultra-low leakage preserves system efficiency in standby and low-power modes |
| TJ max | +150 °C - Enables operation in under-hood automotive and high-ambient industrial environments |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm thermal pad footprint |
Pinout & Package
SMCJ40AHM3_A/I uses a 2-terminal SMC (DO-214AB) package with cathode indicated by a band on the body. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when V > VBR |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics including engine control, ADAS sensors, and infotainment power rails |
| Halogen-free & RoHS-compliant | Meets global environmental compliance requirements without compromising surge robustness |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = ~1.45) versus legacy TVS devices, reducing IC stress |
| Fast response time & glass passivation | Sub-nanosecond turn-on and stable parametric drift across temperature and lifetime |
| MSL Level 1 rating | Allows standard SMT reflow without moisture sensitivity concerns or baking preconditioning |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VBAT and GND, triggered within picoseconds of overvoltage onset. Use Value: Limits clamped voltage to 64.5 V during 1500 W surges, preventing latch-up or gate oxide damage in downstream ASICs. | Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation systems exposed to relay coil flyback. IC Role / Device Role / Timing Role: Standoff-mode protector on sensor supply or signal line, conducting only during >40 V transients. Use Value: Maintains <1.0 μA leakage at 40 V, avoiding measurement offset or bias current errors in precision 24-bit ADC circuits. |
| Telecom DC Power Input Protection | Consumer Device USB Port Surge Suppression |
Use Scenario: Securing 48 V PoE-powered switch ports against lightning-induced common-mode surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail upstream of DC/DC converter, absorbing up to 1500 W pulses. Use Value: Withstands repeated 10/1000 μs surges per IEC 61000-4-5 Level 4, ensuring field reliability without derating. | Use Scenario: Adding secondary-level surge immunity to USB VBUS lines in smart home hubs subjected to ESD and hot-plug events. IC Role / Device Role / Timing Role: Unidirectional clamp between VBUS and GND, activated only during overvoltage, not during normal 5 V operation. Use Value: Halogen-free HM3 construction supports consumer product sustainability mandates while delivering 64.5 V clamping at 23.3 A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40AHE3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR range | Targeted for space-constrained consumer PCBs where 1500 W surge headroom is unnecessary | Select when board area is critical and surge threat level is limited to IEC 61000-4-2 ESD only |
| SMCJ40AHE3_A/I | Same electrical specs and SMC package, but RoHS-compliant commercial grade (E3) without halogen-free certification | Used in non-automotive industrial equipment where halogen-free compliance is not mandated | Choose when AEC-Q101 and halogen-free requirements are not applicable, reducing cost |
Compared with SMCJ40AHM3_A/I, SMAJ40AHE3_A/I offers reduced surge capacity in a smaller footprint, while SMCJ40AHE3_A/I provides identical protection performance without halogen-free assurance - making SMCJ40AHM3_A/I the optimal choice for automotive-qualified, environmentally compliant designs requiring full 1500 W capability.
Availability
SMCJ40AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, and telecom power supplies requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for SMCJ40AHM3_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, power efficiency, and automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 compliance, and precise clamping performance are mandatory.
FAQ
What is the clamping voltage of SMCJ40AHM3_A/I at its rated peak pulse current?
The SMCJ40AHM3_A/I has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 23.3 A using the standard 10/1000 μs waveform. This value is measured under defined test conditions per JEDEC standards and ensures predictable voltage limiting during surge events, directly protecting downstream ICs rated for ≤65 V absolute maximum ratings.
Is SMCJ40AHM3_A/I qualified for automotive applications?
Yes, SMCJ40AHM3_A/I is AEC-Q101 qualified, as confirmed by the HM3 suffix in its ordering code. This qualification validates its reliability under automotive temperature cycling, humidity, mechanical shock, and surge stress conditions - making it suitable for use in engine control units, body electronics, and ADAS sensor power domains where failure tolerance is critical.
What does the "HM3" suffix indicate in SMCJ40AHM3_A/I?
The "HM3" suffix in SMCJ40AHM3_A/I denotes halogen-free, RoHS-compliant, commercial-grade construction meeting JESD 201 Class 2 whisker resistance. It distinguishes this variant from E3 (RoHS only) and HE3/HM3 automotive variants, confirming both environmental compliance and suitability for automated SMT assembly without post-reflow defects.
How does SMCJ40AHM3_A/I differ from bidirectional SMCJ40CA variants?
SMCJ40AHM3_A/I is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where reverse conduction is not required. In contrast, SMCJ40CA is bidirectional, symmetrical in both directions, and used in AC-coupled or floating signal line protection. Their VWM, VBR, and VC values differ accordingly - SMCJ40AHM3_A/I has VWM = 40 V, while SMCJ40CA has VWM = 34.2 V.
What thermal derating applies to SMCJ40AHM3_A/I above 25 °C ambient?
SMCJ40AHM3_A/I must be derated linearly above TA = 25 °C per Figure 2 in the Vishay datasheet (Doc. #88394), with power dissipation (PD) decreasing from 6.5 W at 25 °C to zero at 150 °C. Its thermal resistance junction-to-ambient (RθJA) is 75 °C/W on the recommended 8.0 mm × 8.0 mm copper pad layout, so design margins must account for PCB copper area and airflow in the final enclosure.
SMCJ40AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ40AHM3_A/I FAQ
1.How can I place an order for SMCJ40AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40AHM3_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 SMCJ40AHM3_A/I reliable?
The price and inventory of SMCJ40AHM3_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 SMCJ40AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ40AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40AHM3_A/I?
SMCJ40AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40AHM3_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 SMCJ40AHM3_A/I?
For technical support, including SMCJ40AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ40AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ40AHM3_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 SMCJ40AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ40AHM3_A/I?
All SMCJ40AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40AHM3_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 SMCJ40AHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ40AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40AHM3_A/I Tags
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