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Vishay General Semiconductor - Diodes Division SMB8J24CAHM3_A/I
- Part No.:
- SMB8J24CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J24CAHM3_A/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,435
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Product details
Overview
SMB8J24CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 24 V stand-off voltage (VWM), 38.9 V maximum clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - optimized for automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J24CAHM3_A/I datasheet, SMB8J24CAHM3_A/I pinout, SMB8J24CAHM3_A/I application, or SMB8J24CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low leakage (<1.0 µA at VWM), thermal resistance (RθJL = 20 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity concerns.
Rated for -55 °C to +150 °C junction temperature, it meets J-STD-020 MSL Level 1 and withstands 260 °C reflow peak. The 20.6 A IPPM is validated under 10/1000 µs waveform with derating above 25 °C ambient per Fig. 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing range. |
| VBR (min/max) | 26.7 V / 29.5 V at 1.0 mA - breakdown threshold tolerance ensures consistent turn-on across production lots. |
| VC @ IPPM | 38.9 V at 20.6 A - clamping voltage limits downstream IC stress during 800 W surge events. |
| PPPM | 800 W (10/1000 µs) - energy-handling capacity suitable for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3. |
| ID @ VWM | <1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits. |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance enables reliable power dissipation on standard PCB copper pads. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads solderable per J-STD-002. No polarity marking - bidirectional operation eliminates cathode/anode orientation requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; surge current flows bidirectionally between them during overvoltage events. |
| Case (body) | Thermal and mechanical interface | Exposed metal slug provides primary heat path to PCB copper; requires minimum 5.0 mm × 5.0 mm pad per terminal per datasheet Fig. 6. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without external polarity management. |
| AEC-Q101 qualification | Validated for automotive under-hood and chassis applications including engine control, ADAS sensors, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and supports lead-free reflow assembly with 260 °C peak profile. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs. |
| MSL Level 1 rating | Allows unlimited floor life and standard SMT handling without dry-pack or baking requirements. |
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 inductive switching spikes in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to clamp ±30 kV ESD and 100 V/50 ms load dump surges before they reach signal conditioning circuitry. Use Value: Prevents permanent damage to precision op-amps and ADCs while maintaining <1.0 µA leakage to avoid offset drift in µA-level sensor bias networks. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers against field-wiring induced surges and ground bounce. IC Role / Device Role / Timing Role: Primary line-level transient suppressor mounted adjacent to terminal block, shunting >800 W surges away from isolation amplifiers and ADC drivers. Use Value: Maintains signal fidelity with 38.9 V clamping ceiling, ensuring protected downstream components remain below absolute maximum ratings during IEC 61000-4-5 Level 3 testing. |
| Telecom Line Card Protection | Consumer Appliance Motor Control |
|
Use Scenario: Shielding Ethernet PHYs, PoE injectors, and DSL line drivers from lightning-induced surges and hot-swap transients in outdoor or enterprise telecom equipment. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), providing fast-response clamping for residual fast-rising edges. Use Value: Sub-ns response time and 20.6 A IPPM capability ensure robust coordination with upstream GDTs while limiting let-through voltage to safe levels for 2.5 V/3.3 V PHYs. |
Use Scenario: Securing microcontroller GPIOs and half-bridge gate drivers in washing machine, HVAC, and power tool motor control boards exposed to brush-commutator noise and relay coil kickback. IC Role / Device Role / Timing Role: Localized TVS at motor driver IC pins to absorb repetitive 100–200 V spikes generated by inductive flyback during PWM switching. Use Value: 800 W PPPM rating and 20 °C/W RθJL enable sustained operation under frequent surge conditions without thermal runaway or parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J24CAHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (not AEC-Q101 qualified); E3 suffix denotes standard tin plating without halogen-free constraint. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive qualification needs and halogen-free material is not required. |
| SMAJ24CA-M3/5B | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs; RθJA higher (110 °C/W vs. 72 °C/W). | Reduced surge margin and thermal performance; limited to lower-energy transients or space-constrained layouts. | Choose only if board area is critical and surge threat level is ≤400 W (e.g., internal signal lines, non-connector-facing locations). |
Compared with SMB8J24CAHM3_A/I, the HE3 variant trades automotive qualification for lower cost in non-automotive use cases, while the SMAJ24CA-M3/5B sacrifices surge robustness and thermal efficiency for footprint reduction - making SMB8J24CAHM3_A/I the optimal choice for AEC-Q101–mandated, high-energy protection points.
Availability
SMB8J24CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, and telecom line card protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMB8J24CAHM3_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, and protection devices with emphasis on reliability, power density, and automotive-grade validation.
The SMB8JxxCA series targets high-reliability transient suppression in harsh environments, with design focus on AEC-Q101 compliance, low clamping ratios, and compatibility with automated SMT assembly for automotive and industrial end equipment.
FAQ
What is the peak pulse power rating of SMB8J24CAHM3_A/I and under what test condition?
The SMB8J24CAHM3_A/I has a peak pulse power rating (PPPM) of 800 W, measured using the standardized 10/1000 µs double-exponential current waveform per ANSI/IEEE C62.35. This rating applies to bidirectional operation at TA = 25 °C and must be derated linearly above that ambient temperature per Figure 2 in the Vishay datasheet 88422.
Is SMB8J24CAHM3_A/I suitable for automotive applications?
Yes, SMB8J24CAHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction with automotive-grade reliability testing. It is explicitly rated for under-hood and chassis applications including engine control units, ADAS sensors, and body electronics where load dump, ESD, and inductive switching transients occur.
What does the "HM3" suffix signify in SMB8J24CAHM3_A/I?
The "HM3" suffix in SMB8J24CAHM3_A/I denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. It also indicates AEC-Q101 qualification and packaging in 13" tape-and-reel (I-code) - distinguishing it from commercial-grade E3/M3 variants and automotive HE3/HM3 variants with different reel sizes or revision codes.
How does the clamping voltage of SMB8J24CAHM3_A/I compare to its breakdown voltage?
The SMB8J24CAHM3_A/I has a breakdown voltage range of 26.7 V to 29.5 V at 1.0 mA test current, while its maximum clamping voltage (VC) is 38.9 V at 20.6 A IPPM. This yields a clamping ratio of approximately 1.42, reflecting efficient voltage limiting with minimal overshoot - critical for protecting 3.3 V or 5 V logic interfaces downstream.
What is the thermal resistance specification for SMB8J24CAHM3_A/I and why does it matter?
SMB8J24CAHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W. This low value enables effective heat transfer from the silicon die to the PCB copper via the lead frame, supporting reliable 800 W surge dissipation without excessive junction temperature rise - especially important in compact automotive modules with limited airflow.
SMB8J24CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 20.6A
- Power - Peak Pulse:
- 800W
- 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-214AA (SMB)
SMB8J24CAHM3_A/I FAQ
1.How can I place an order for SMB8J24CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J24CAHM3_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 SMB8J24CAHM3_A/I reliable?
The price and inventory of SMB8J24CAHM3_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 SMB8J24CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J24CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J24CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J24CAHM3_A/I?
SMB8J24CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J24CAHM3_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 SMB8J24CAHM3_A/I?
For technical support, including SMB8J24CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J24CAHM3_A/I requirements.
6.How does Aetrix verify that SMB8J24CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J24CAHM3_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 SMB8J24CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J24CAHM3_A/I?
All SMB8J24CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J24CAHM3_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 SMB8J24CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMB8J24CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J24CAHM3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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