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Vishay General Semiconductor - Diodes Division SMB8J24CAHM3_B/H
- Part No.:
- SMB8J24CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J24CAHM3_B/H.pdf
- Description:
- 800W,24V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,760
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Product details
Overview
SMB8J24CAHM3_B/H 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), 26.7–29.5 V breakdown voltage (VBR), 38.9 V clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J24CAHM3_B/H datasheet, SMB8J24CAHM3_B/H pinout, SMB8J24CAHM3_B/H application, or SMB8J24CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 20.6 A surge current rating, thermal resistance (RθJA = 72 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients exceeding its reverse stand-off voltage. Its glass-passivated junction ensures stable breakdown behavior under repetitive surges, while the bidirectional configuration enables symmetric clamping on AC-coupled or differential lines without polarity sensitivity.
Designed for surface-mount automated assembly, it meets J-STD-020 MSL Level 1 (260 °C peak reflow) and supports automotive-grade reliability via AEC-Q101 qualification. The SMB package provides low-profile mounting with defined thermal pad layout (0.2" × 0.2" copper) to sustain 800 W pulse power under standardized test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 26.7 V / 29.5 V at 1 mA - guaranteed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 38.9 V at 20.6 A - clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPPM | 800 W - peak transient power handling capacity under standardized waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage ensuring minimal standby power loss in battery-powered systems |
| TJ max. | +150 °C - extended junction temperature rating enabling under-hood automotive use |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline with 2.2 mm height and 3.94 mm length |
Pinout & Package
SMB8J24CAHM3_B/H uses a 2-terminal SMB (DO-214AA) package with no polarity marking (bidirectional). 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 conduction path | Both terminals function identically; voltage clamping occurs regardless of polarity direction |
| Case (body) | Thermal and mechanical interface | No electrical connection; requires 0.2" × 0.2" copper pad per terminal for thermal derating compliance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and supports lead-free reflow without compromising reliability |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.46) versus standard TVS diodes, reducing protected circuit overvoltage |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow compatibility without dry-pack handling |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed directly at connector or IC input pins to divert surge energy before reaching sensitive circuitry. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-2 ESD (±15 kV air) due to sub-nanosecond response and 38.9 V clamping. | Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring transients and relay coil flyback. IC Role / Device Role / Timing Role: Primary overvoltage suppression device across input terminals, coordinated with upstream fusing and filtering. Use Value: Withstands repeated 800 W surges without degradation, supporting >100,000 operations in harsh factory environments per AEC-Q101 stress testing. |
| Telecom Line Interface | Consumer Appliance Control Board |
Use Scenario: Bidirectional protection of RS-485/RS-422 differential data lines in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, providing symmetrical clamping without signal distortion. Use Value: 20.6 A IPPM and 38.9 V VC ensure data eye integrity remains intact during 10/1000 µs transients up to 800 W. | Use Scenario: Input protection for microcontroller GPIOs and relay drivers on washing machine or HVAC control boards subject to motor switching noise. IC Role / Device Role / Timing Role: Localized clamp at board edge connectors and relay coil terminals to prevent latch-up or gate oxide damage. Use Value: 1.0 µA leakage at 24 V VWM eliminates measurable standby current increase, critical for energy-rated appliances. |
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_B/H | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification; acceptable for commercial but not automotive Tier 1 supply chains requiring HM3 | Select when halogen-free requirement is not mandated and cost optimization is prioritized |
| SMAJ24CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (~100 °C/W) | Insufficient for 800 W surge events; suitable only for lower-energy interfaces like USB or audio lines | Choose only for space-constrained non-automotive designs where 400 W rating suffices |
Compared with SMB8J24CAHM3_B/H, SMB8J24CAHE3_B/H offers identical protection performance with relaxed material compliance, while SMAJ24CA trades power handling and thermal robustness for footprint reduction - making the original the sole choice for AEC-Q101-compliant 800 W surge suppression in SMB form factor.
Availability
SMB8J24CAHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer appliance control boards requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMB8J24CAHM3_B/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 and application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional surge suppression in automotive and industrial environments where AEC-Q101 validation and consistent clamping behavior are mandatory.
FAQ
What is the clamping voltage of SMB8J24CAHM3_B/H at its rated peak pulse current?
The SMB8J24CAHM3_B/H has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current (IPPM) of 20.6 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for downstream ICs such as CAN transceivers or ADC front-ends. The clamping performance is validated across -55 °C to +150 °C operating range.
Is SMB8J24CAHM3_B/H suitable for automotive applications?
Yes, SMB8J24CAHM3_B/H is AEC-Q101 qualified and designated with the HM3 suffix, indicating halogen-free, RoHS-compliant construction meeting automotive supply chain requirements. It is explicitly rated for under-hood and chassis-mounted applications with TJ max = +150 °C and validated for load dump, ESD, and ISO 7637-2 transient immunity. The part appears in Vishay's automotive-grade ordering matrix with HE3/HM3 suffixes.
How does the bidirectional configuration of SMB8J24CAHM3_B/H affect its PCB layout?
The SMB8J24CAHM3_B/H has no polarity marking and functions identically in either orientation, simplifying PCB layout by eliminating cathode alignment constraints. Layout must still follow Vishay's recommended 0.2" × 0.2" copper pad per terminal for thermal performance, and the device must be placed as close as possible to the protected interface (e.g., connector or IC pin) to minimize inductance in the surge path.
What is the difference between SMB8J24CAHM3_B/H and SMB8J24CAHE3_B/H?
SMB8J24CAHM3_B/H and SMB8J24CAHE3_B/H share identical electrical specifications (VWM = 24 V, VC = 38.9 V, PPPM = 800 W) and AEC-Q101 qualification, but differ in material compliance: HM3 denotes halogen-free construction, while HE3 is RoHS-compliant without halogen restrictions. Both use the same SMB package and tape-and-reel delivery (B/H = 7" reel, 750 units).
Does SMB8J24CAHM3_B/H require derating at elevated ambient temperatures?
Yes, SMB8J24CAHM3_B/H must be derated above TA = 25 °C per Figure 2 in Vishay document 88422. Its peak pulse power drops linearly to zero at +150 °C junction temperature, with RθJA = 72 °C/W defining thermal limits. For example, at TA = 85 °C, maximum allowable PPPM reduces to approximately 520 W assuming no additional heatsinking - design verification using thermal simulation or empirical testing is required for high-temperature deployments.
SMB8J24CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- 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_B/H FAQ
1.How can I place an order for SMB8J24CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J24CAHM3_B/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 SMB8J24CAHM3_B/H reliable?
The price and inventory of SMB8J24CAHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J24CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J24CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J24CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J24CAHM3_B/H?
SMB8J24CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J24CAHM3_B/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 SMB8J24CAHM3_B/H?
For technical support, including SMB8J24CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J24CAHM3_B/H requirements.
6.How does Aetrix verify that SMB8J24CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J24CAHM3_B/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 SMB8J24CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J24CAHM3_B/H?
All SMB8J24CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J24CAHM3_B/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 SMB8J24CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMB8J24CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J24CAHM3_B/H Tags
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