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Vishay General Semiconductor - Diodes Division SMB8J24CAHM3_A/H
- Part No.:
- SMB8J24CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J24CAHM3_A/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,547
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Product details
Overview
SMB8J24CAHM3_A/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_A/H datasheet, SMB8J24CAHM3_A/H pinout, SMB8J24CAHM3_A/H application, or SMB8J24CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction structure, responding within <1 ps to transients induced by inductive switching or ESD events. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, supporting operation from –55 °C to +150 °C junction temperature. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail for reliable standby leakage control. |
| VBR min/max | 26.7 V / 29.5 V at 1.0 mA - defines tight breakdown tolerance ensuring predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 38.9 V at 20.6 A - clamping voltage under 10/1000 µs surge; determines worst-case overvoltage seen by protected ICs. |
| PPPM | 800 W - peak pulse power handling capacity; enables robust protection against IEC 61000-4-5 Level 3 (1 kV/42 Ω) surges. |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage at rated stand-off; minimizes power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive and industrial environments. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads, MSL Level 1, 260 °C reflow compatible. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Transient return path (bidirectional) | Not marked; symmetric terminals enable identical clamping in both directions - no polarity dependency in layout. |
| Cathode (Cathode Band Side) | Transient return path (bidirectional) | Marked with cathode band; functionally identical to anode due to bidirectional construction - terminal assignment is arbitrary. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and ungrounded sensor outputs without polarity concerns. |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules, ADAS sensors, and body electronics requiring long-term field reliability. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and eliminates corrosive halogen emissions during PCB reflow or end-of-life incineration. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on downstream components - critical for protecting 3.3 V or 5 V logic interfacing with 24 V systems. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles without baking - reduces manufacturing overhead in high-volume SMT lines. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Limits transient voltage to ≤38.9 V during 20.6 A surges, preventing latch-up or gate oxide damage in 5 V/3.3 V interface ICs while maintaining AEC-Q101 compliance. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller (PLC) backplanes subjected to field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Primary front-end surge suppressor mounted adjacent to terminal block, absorbing >800 W pulses before they propagate into isolation barriers or microcontrollers. Use Value: Withstands repeated 10/1000 µs surges up to 800 W while exhibiting only 1.0 µA leakage at 24 V - preserving input threshold accuracy and reducing false triggers. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in outdoor telecom equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential pair (A/B lines), referenced to local ground via low-inductance layout. Use Value: Symmetric clamping ensures equal protection on both polarities of differential signaling, eliminating need for dual unidirectional devices and saving board space. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., washing machine drum drives, HVAC blowers). IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals or H-bridge outputs to clamp inductive kickback before it couples into MCU power rails. Use Value: 150 °C max junction temperature and robust 800 W rating allow sustained operation near heat-generating motor drivers without thermal derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J24CAHE3_A/H | Same electrical specs and SMB package, but RoHS-compliant without halogen-free certification (E3 vs HM3). | Lacks halogen-free compliance; acceptable for commercial/industrial use where halogen restrictions do not apply. | Select when halogen-free requirement is absent and cost optimization is prioritized over automotive environmental mandates. |
| SMAJ24CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (90 °C/W), same VWM/VC. | Insufficient for 800 W surge requirements; suitable only for lower-energy IEC 61000-4-2 ESD or light-duty industrial transients. | Choose only if board space is severely constrained and surge threat level is limited to sub-400 W events - not a drop-in replacement. |
Compared with SMB8J24CAHM3_A/H, the HE3 variant trades halogen-free status for broader commercial availability, while SMAJ24CA sacrifices power handling and thermal performance for footprint reduction - making SMB8J24CAHM3_A/H the optimal choice for AEC-Q101–mandated, high-energy automotive and industrial protection.
Availability
SMB8J24CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J24CAHM3_A/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 targets high-reliability transient suppression in automotive and industrial systems, engineered for AEC-Q101 compliance, low clamping ratios, and robust surge endurance in harsh environments.
FAQ
What is the clamping voltage of SMB8J24CAHM3_A/H at its rated peak pulse current?
The SMB8J24CAHM3_A/H has a maximum clamping voltage (VC) of 38.9 V at 20.6 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 24 V system interfaces and downstream 3.3 V/5 V ICs. The SMB8J24CAHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMB8J24CAHM3_A/H suitable for automotive applications?
Yes, SMB8J24CAHM3_A/H is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, ADAS sensors, and body electronics. Its halogen-free (HM3) construction, MSL Level 1 rating, and validation across HTOL, temperature cycling, and ESD tests meet stringent automotive reliability requirements. The SMB8J24CAHM3_A/H is listed in Vishay's automotive-grade ordering codes with suffix "HM3" and revision "_A/H", confirming production release for vehicle platforms.
How does SMB8J24CAHM3_A/H differ from unidirectional variants like SMB10J24A?
SMB8J24CAHM3_A/H is bidirectional with symmetrical clamping in both polarities, whereas SMB10J24A is unidirectional and conducts only in reverse bias. The SMB8J24CAHM3_A/H offers 800 W PPPM and 20.6 A IPPM, while SMB10J24A delivers 1000 W PPPM and 25.7 A IPPM but requires correct polarity orientation. The SMB8J24CAHM3_A/H eliminates layout errors from misoriented placement and supports AC-coupled or floating signal lines - making it preferred for differential buses and sensor outputs without defined ground reference.
What is the thermal resistance of SMB8J24CAHM3_A/H, and how does it affect layout design?
SMB8J24CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W, measured on 0.2" × 0.2" copper pads per terminal. These values require adherence to Vishay's recommended pad layout to avoid thermal derating - undersized pads increase RθJA, raising junction temperature during repeated surges. For sustained operation near 150 °C TJ max, designers must ensure adequate copper area and avoid enclosing the SMB8J24CAHM3_A/H in thermally isolated zones.
Does SMB8J24CAHM3_A/H have a specified junction capacitance, and is it suitable for high-speed data lines?
No, the official Vishay datasheet for SMB8J24CAHM3_A/H does not specify junction capacitance (CJ). While typical SMB-package TVS diodes exhibit 100–500 pF depending on voltage rating, absence of published CJ data means SMB8J24CAHM3_A/H is not characterized for high-speed data line protection (e.g., USB 2.0, HDMI, or Gigabit Ethernet). For such applications, designers should select TVS devices with documented low capacitance (<5 pF) and verified signal integrity performance - the SMB8J24CAHM3_A/H is optimized for power/signal line surge suppression, not bandwidth-critical interfaces.
SMB8J24CAHM3_A/H 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/H FAQ
1.How can I place an order for SMB8J24CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J24CAHM3_A/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_A/H reliable?
The price and inventory of SMB8J24CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J24CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J24CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J24CAHM3_A/H?
SMB8J24CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J24CAHM3_A/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_A/H?
For technical support, including SMB8J24CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J24CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J24CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J24CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J24CAHM3_A/H?
All SMB8J24CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J24CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMB8J24CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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