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Vishay General Semiconductor - Diodes Division SMCJ24AHM3/I
- Part No.:
- SMCJ24AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24AHM3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,033
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Product details
Overview
SMCJ24AHM3/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 24 V stand-off voltage (VWM), 38.9 V maximum clamping voltage (VC) at 38.6 A peak pulse current (IPPM), and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ24AHM3/I datasheet, SMCJ24AHM3/I pinout, SMCJ24AHM3/I application, or SMCJ24AHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance, and real-world use context for ESD/surge protection design validation.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 24 V reverse stand-off voltage (VWM) and rapidly transitions to low-impedance conduction above its 26.7–29.5 V breakdown range (VBR at 1 mA), limiting transient energy to safe levels. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and repeatable clamping performance across temperature.
Designed for automated SMT assembly, it meets MSL level 1 per J-STD-020 with 260 °C peak reflow tolerance and supports bidirectional variants via CA suffix. The SMCJ24AHM3/I variant is halogen-free, RoHS-compliant, and AEC-Q101 qualified - confirming suitability for automotive-grade power rail protection where reliability under thermal cycling and surge stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 26.7 V / 29.5 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 38.9 V at 38.6 A - Clamped voltage under 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 1500 W - Peak pulse power handling capability; enables suppression of high-energy lightning-induced surges. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; informs heatsinking requirements. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 0.320" length and cathode band marking; compatible with standard SMT pick-and-place. |
Pinout & Package
SMCJ24AHM3/I uses the SMC (DO-214AB) package: a surface-mount, two-terminal, unidirectional configuration with cathode identified by a visible band on the body. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated power derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop when transient exceeds VWM. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V supply); polarity band identifies this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power domains. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms full compliance with environmental regulations and end-of-life recycling requirements. |
| Low incremental surge resistance | Enables tight clamping (38.9 V at 38.6 A) without excessive voltage overshoot during fast transients. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage current under thermal and humidity stress. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control units against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and DC/DC input stage. Use Value: Limits transient voltage to ≤38.9 V during 1500 W surges, preventing damage to downstream regulators and microcontrollers. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protection element mounted at connector entry point before optocoupler or buffer IC. Use Value: Responds within picoseconds to clamp spikes up to 10/1000 µs, preserving signal integrity and reducing false triggering. |
| Telecom DC Power Interface | Medical Equipment Power Entry |
Use Scenario: Safeguarding 24 V backup power inputs in base station remote radio units exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage suppression device upstream of hot-swap controllers and PMICs. Use Value: Handles repeated 1500 W pulses without degradation, supporting UL 497B recognition for telecom protector classification. |
Use Scenario: Securing auxiliary 24 V power feeds in diagnostic imaging systems where failure could impact patient safety. IC Role / Device Role / Timing Role: Final-stage transient barrier before isolated DC/DC converters powering sensitive analog front-ends. Use Value: AEC-Q101 qualification and 150 °C TJ max ensure operational reliability in thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3/A | Same VWM (24 V) and VC (38.9 V), but lower PPPM (400 W) and smaller SMA package (DO-214AC). | Not suitable for 1500 W surge events; limited to low-energy ESD or secondary protection layers. | Select only when board space is constrained and surge threat level is ≤400 W. |
| SMCJ24AHE3/I | Identical electrical specs and SMC package, but RoHS-compliant commercial grade (E3) instead of halogen-free (HM3). | Lacks halogen-free certification; may not meet automotive OEM material declarations or green procurement mandates. | Choose when halogen-free requirement is absent and cost optimization is prioritized over material compliance. |
Compared with SMCJ24AHM3/I, SMAJ24AHE3/A offers reduced surge capacity in a smaller footprint, while SMCJ24AHE3/I matches performance but omits halogen-free assurance - making SMCJ24AHM3/I the sole choice for AEC-Q101 + halogen-free dual compliance in 1500 W applications.
Availability
SMCJ24AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and telecom infrastructure requiring stable component supply with full AEC-Q101 and halogen-free compliance.
Supply support for SMCJ24AHM3/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 targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom power systems demanding 1500 W surge immunity and AEC-Q101 validation.
FAQ
What is the clamping voltage of SMCJ24AHM3/I under a 10/1000 µs surge?
The SMCJ24AHM3/I clamps to a maximum of 38.9 V when subjected to its rated 38.6 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured at TA = 25 °C on 8.0 mm × 8.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ24AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMCJ24AHM3/I qualified for automotive applications?
Yes, SMCJ24AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified). This qualification covers stress tests including high-temperature operating life, temperature cycling, and surge robustness - validating its use in engine control units, body electronics, and ADAS power domains where reliability under thermal and electrical stress is mandatory.
What does the "HM3" suffix mean in SMCJ24AHM3/I?
The "HM3" suffix in SMCJ24AHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade E3 versions and confirms compliance with automotive material restrictions and environmental standards. The "I" denotes 13-inch tape-and-reel packaging (3500 units per reel), while "HM3" governs material content, reliability testing, and process controls - all documented in Vishay's ordering information table.
How does SMCJ24AHM3/I differ from bidirectional SMCJ24CA variants?
SMCJ24AHM3/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse voltage is blocked. In contrast, SMCJ24CA is bidirectional, symmetrical in both directions, and used in AC-coupled or floating signal paths. Their VWM (24 V), VBR (26.7–29.5 V), and VC (38.9 V) match, but SMCJ24AHM3/I cannot replace SMCJ24CA in AC applications due to inherent polarity dependence and lack of reverse conduction capability.
What is the thermal resistance of SMCJ24AHM3/I, and how does it affect layout?
The SMCJ24AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value directly impacts PCB layout: reducing pad size or omitting thermal vias increases junction temperature during repetitive surges, potentially degrading clamping consistency. For sustained surge duty cycles, designers must verify thermal rise using this RθJA and actual power dissipation to avoid exceeding the +150 °C maximum junction temperature.
SMCJ24AHM3/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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 38.6A
- 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)
SMCJ24AHM3/I FAQ
1.How can I place an order for SMCJ24AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24AHM3/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 SMCJ24AHM3/I reliable?
The price and inventory of SMCJ24AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ24AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24AHM3/I?
SMCJ24AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24AHM3/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 SMCJ24AHM3/I?
For technical support, including SMCJ24AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24AHM3/I requirements.
6.How does Aetrix verify that SMCJ24AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ24AHM3/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 SMCJ24AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ24AHM3/I?
All SMCJ24AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24AHM3/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 SMCJ24AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ24AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ24AHM3/I Tags
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