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Vishay General Semiconductor - Diodes Division SMCJ24CAHM3/H
- Part No.:
- SMCJ24CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24CAHM3/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,026
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Product details
Overview
SMCJ24CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, with 24 V standoff voltage (VWM), 38.9 V clamping voltage (VC) at 38.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects signal lines and power rails in automotive sensor interfaces against ESD and inductive switching transients.
For engineers reviewing the SMCJ24CAHM3/H datasheet, SMCJ24CAHM3/H pinout, SMCJ24CAHM3/H application, or SMCJ24CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 24 V), but triggers into low-impedance conduction when transient voltage exceeds its 26.7–29.5 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche behavior and fast response (<1 ns).
Designed for bidirectional surge suppression, SMCJ24CAHM3/H delivers symmetrical clamping in both polarities without polarity marking. Its thermal resistance (RθJA = 75 °C/W) and junction temperature limit (TJ = –55 to +150 °C) support operation in under-hood automotive environments with minimal heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe working margin below clamping threshold |
| VBR (min/max) | 26.7 V / 29.5 V at 1 mA - Confirmed breakdown range ensuring reliable triggering across process variation and temperature |
| VC @ IPPM | 38.9 V at 38.6 A - Clamped voltage during 10/1000 μs surge; limits stress on downstream ICs like CAN transceivers or microcontrollers |
| PPPM | 1500 W - Peak transient power handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity with proper PCB layout |
| TJ max. | +150 °C - Enables use in engine control units and ADAS modules where ambient temperatures exceed 105 °C |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with J-STD-020 MSL level 1 reflow |
Pinout & Package
SMCJ24CAHM3/H uses a 2-terminal SMC (DO-214AB) package with no polarity marking (bidirectional configuration). 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/Cathode (symmetrical) | Transient current path | Both terminals function identically; surge current flows bidirectionally through the same avalanche junction |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94 V-0 flammability rating; copper pad mounting enables thermal dissipation per Fig. 2 derating curves |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
| Halogen-free & RoHS-compliant | Meets JEDEC JS709C and IPC-1752A requirements; eliminates brominated flame retardants for safer end-of-life processing |
| Low incremental surge resistance | Enables tight clamping (VC/IPPM ratio = 1.01 Ω) to minimize let-through energy during fast transients |
| Very fast response time | Sub-nanosecond turn-on ensures protection of high-speed interfaces such as LIN or SENT sensor buses |
| Glass passivated junction | Provides stable, repeatable avalanche characteristics over lifetime and temperature without degradation |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure or temperature sensors in engine control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS clamping transient energy before it reaches the sensor signal conditioner or ADC input. Use Value: Maintains signal integrity by limiting voltage excursion to ≤38.9 V during 10/1000 μs surges up to 1500 W, preventing latch-up or damage to 3.3 V/5 V front-end circuitry. | Use Scenario: Safeguarding digital input channels of programmable logic controllers connected to 24 V field wiring subject to inductive kickback. IC Role / Device Role / Timing Role: Bidirectional voltage clamp absorbing reverse-polarity miswiring events and relay coil flyback energy. Use Value: Eliminates need for external series resistors or diode steering networks due to symmetrical 24 V standoff and low-leakage design. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Shielding RS-485 transceiver bus lines in base station remote units from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge suppression element placed directly at connector entry point, ahead of common-mode chokes. Use Value: Withstands repeated 1 kV/0.5 J transients per IEC 61000-4-5 while maintaining <1 μA leakage at 24 V, preserving bus bias stability. | Use Scenario: Protecting secondary-side 24 V DC output rails of wall-mounted AC/DC adapters used in smart home hubs. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp preventing damage to USB-PD controllers or PMICs during output short-circuit recovery. Use Value: Halogen-free construction meets regional environmental mandates; SMC package allows dense layout near output capacitors without compromising creepage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CAHE3/A | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable only for lower-energy transients (IEC 61000-4-2 ±8 kV contact); not rated for AEC-Q101 | Select when space-constrained and automotive qualification is unnecessary |
| 1.5KE24CA | Through-hole DO-201 package, same VWM/VC, but slower thermal response and no MSL level 1 rating | Used in legacy industrial power supplies where wave soldering remains standard; incompatible with fine-pitch SMT lines | Select for cost-sensitive, non-automotive designs with manual or wave-solder assembly |
Compared with SMAJ24CAHE3/A and 1.5KE24CA, SMCJ24CAHM3/H offers superior surge robustness (1500 W vs. 400 W or 1500 W with inferior thermal performance), AEC-Q101 validation for automotive deployment, and optimized SMT manufacturability-making it the preferred choice for new-generation vehicle electronics and high-reliability industrial controls.
Availability
SMCJ24CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection circuits, and consumer power adapter outputs requiring stable component supply and full traceability.
Supply support for SMCJ24CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was developed specifically for high-power transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where consistent clamping performance and long-term stability under thermal cycling are critical.
FAQ
What is the clamping voltage of SMCJ24CAHM3/H at its rated peak pulse current?
The SMCJ24CAHM3/H has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current (IPPM) of 38.6 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable let-through voltage during surge events, enabling robust protection of downstream 24 V-rated ICs. The SMCJ24CAHM3/H maintains this clamping performance across its full operating temperature range.
Is SMCJ24CAHM3/H qualified for automotive applications?
Yes, SMCJ24CAHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It undergoes rigorous stress testing-including high-temperature reverse bias, temperature cycling, and ESD-to ensure reliability in automotive subsystems such as body control modules and ADAS sensor interfaces. The SMCJ24CAHM3/H meets all requirements for under-hood and cabin-mounted electronics.
How does the bidirectional configuration of SMCJ24CAHM3/H affect PCB layout?
The bidirectional configuration of SMCJ24CAHM3/H eliminates polarity concerns during placement-no cathode band marking is present, and either terminal may connect to either side of the protected line. This simplifies layout for differential or AC-coupled signals and avoids orientation errors in automated assembly. The SMCJ24CAHM3/H requires symmetric 8.0 mm × 8.0 mm copper pads per terminal per Vishay's recommended layout to achieve rated thermal and surge performance.
What is the maximum operating junction temperature for SMCJ24CAHM3/H?
The SMCJ24CAHM3/H has a maximum operating junction temperature (TJ) of +150 °C, verified per its thermal characterization data and AEC-Q101 qualification. This allows sustained operation in high-ambient environments such as engine compartments or enclosed industrial enclosures. Derating of peak pulse power begins above TA = 25 °C per Figure 2 in the datasheet, and the SMCJ24CAHM3/H maintains full functionality across its full –55 °C to +150 °C junction range.
Does SMCJ24CAHM3/H meet lead-free and halogen-free compliance standards?
Yes, SMCJ24CAHM3/H is halogen-free and RoHS-compliant, as indicated by the "HM3" suffix in its ordering code. It satisfies JEDEC JS709C and IPC-1752A material declarations, with zero brominated or chlorinated flame retardants. The matte tin-plated leads are compatible with lead-free reflow profiles (peak 260 °C, MSL level 1), and the molding compound meets UL 94 V-0 flammability requirements-ensuring compliance for global electronics manufacturing and end-of-life processing.
SMCJ24CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ24CAHM3/H FAQ
1.How can I place an order for SMCJ24CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24CAHM3/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 SMCJ24CAHM3/H reliable?
The price and inventory of SMCJ24CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ24CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24CAHM3/H?
SMCJ24CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24CAHM3/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 SMCJ24CAHM3/H?
For technical support, including SMCJ24CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24CAHM3/H requirements.
6.How does Aetrix verify that SMCJ24CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ24CAHM3/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 SMCJ24CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ24CAHM3/H?
All SMCJ24CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24CAHM3/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 SMCJ24CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ24CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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