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Vishay General Semiconductor - Diodes Division SMB8J24CAHM3/H
- Part No.:
- SMB8J24CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J24CAHM3/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,903
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Product details
Overview
SMB8J24CAHM3/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 standoff 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/H datasheet, SMB8J24CAHM3/H pinout, SMB8J24CAHM3/H application, or SMB8J24CAHM3/H equivalent, this device is selected for AEC-Q101-qualified bidirectional surge suppression where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical in 12 V/24 V system designs.
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal bias it presents <1 µA leakage at 24 V (VWM), then rapidly avalanches when transients exceed VBR (26.7–29.5 V @ 1 mA), limiting downstream voltage to ≤38.9 V at 20.6 A. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Rated for -55 °C to +150 °C junction temperature and qualified to AEC-Q101, SMB8J24CAHM3/H supports automotive-grade reliability with halogen-free, RoHS-compliant construction (HM3 suffix), and meets J-STD-020 MSL Level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for 24 V nominal systems. |
| VBR min/max | 26.7 V / 29.5 V @ 1 mA - tight breakdown window ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 38.9 V @ 20.6 A - clamping voltage limits protected circuit stress during 800 W transient events (10/1000 µs). |
| PPPM | 800 W - peak pulse power rating confirms robustness against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on automotive modules. |
| TJ max | +150 °C - enables placement near heat sources (e.g., power stages, ECUs) without derating concerns. |
| Package | SMB (DO-214AA) - surface-mount footprint (5.59 mm × 4.06 mm) compatible with automated assembly and IPC-7351B land patterns. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation (no cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connected to ground or low-impedance reference; conducts during both positive and negative transients. |
| Cathode | Transient return path (bidirectional) | Electrically symmetric to anode; no functional distinction - device behaves identically in either orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and body electronics per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards (e.g., ELV, REACH) and JESD201 Class 2 whisker resistance. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning; eliminates moisture-related popcorning risk. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V/5 V logic interfacing with 24 V supply rails. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure. |
Applications
| Automotive CAN FD Transceivers | Industrial PLC Digital Inputs |
|---|---|
|
Use Scenario: Protecting CAN FD physical layer transceivers (e.g., TCAN1042, SN65HVD256) from load dump and ESD in 24 V vehicle networks. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between CANH/CANL and chassis ground. Use Value: Limits differential surge to <40 V, preserving transceiver integrity during ISO 16750-2 load dump tests without adding series impedance. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers against field-wiring transients and relay coil kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS at terminal block entry point, upstream of optocoupler or Schmitt trigger input stage. Use Value: Absorbs 800 W pulses while maintaining <1 µA leakage - avoids false triggering and ensures long-term input threshold stability. |
| Automotive Camera Power Rails | Smart Sensor Signal Conditioning |
|
Use Scenario: Surge protection on 12 V power feed to rear-view or surround-view camera modules exposed to alternator ripple and jump-start events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC line, positioned before DC/DC converter input. Use Value: Clamps to 38.9 V within nanoseconds, preventing damage to image sensor and ISP ICs rated for 16 V absolute max. |
Use Scenario: Protecting analog outputs (e.g., 4–20 mA, 0–10 V) of smart pressure/temperature sensors in factory automation. IC Role / Device Role / Timing Role: Bidirectional TVS across output terminals to suppress common-mode surges induced by nearby motor drives. Use Value: Maintains ±0.1% full-scale accuracy by contributing <0.001% error via sub-µA leakage at 24 V loop supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA-M3/52 | Same VWM (24 V), VBR (26.7–29.5 V), VC (38.9 V), but rated for 1000 W unidirectional / 800 W bidirectional; commercial-grade (non-AEC-Q101); M3 suffix only (halogen-free, RoHS). | Lacks AEC-Q101 qualification; suitable for industrial/commercial 24 V I/O but not automotive ECUs or ADAS. | Select when AEC-Q101 is not required and cost sensitivity outweighs automotive qualification needs. |
| SMCJ24CAHE3_A/H | Same electrical specs (VWM = 24 V, VC = 38.9 V), but in larger SMC (DO-214AB) package; AEC-Q101 qualified; HE3 suffix (RoHS, non-halogen-free). | Higher thermal mass (RθJA = 35 °C/W vs. 72 °C/W) allows higher sustained surge duty cycles; footprint incompatible with SMB layouts. | Choose when board space permits larger package and enhanced thermal handling is needed for repetitive surge environments. |
Compared with SMBJ24CA-M3/52 and SMCJ24CAHE3_A/H, SMB8J24CAHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and SMB footprint - making it optimal for space-constrained, high-reliability automotive sensor nodes where regulatory compliance and reflow safety are mandatory.
Availability
SMB8J24CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC inputs, and 24 V camera power rail designs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J24CAHM3/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.
SMB8J24CAHM3/H belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for AEC-Q101-compliant surge protection in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J24CAHM3/H at its rated peak pulse current?
The SMB8J24CAHM3/H has a maximum clamping voltage (VC) of 38.9 V when subjected to its specified peak pulse current (IPPM) of 20.6 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 38.9 V during standardized surge events - a key parameter for protecting 3.3 V or 5 V interface ICs powered from a 24 V rail. The SMB8J24CAHM3/H achieves this with minimal overshoot due to its low incremental surge resistance.
Is SMB8J24CAHM3/H suitable for automotive applications?
Yes, SMB8J24CAHM3/H is explicitly AEC-Q101 qualified, meaning it has passed stress tests for high-temperature operating life, unbiased high-humidity bias, temperature cycling, and mechanical shock - all required for automotive under-hood and cabin electronics. Its HM3 suffix denotes halogen-free, RoHS-compliant construction meeting automotive environmental standards. The SMB8J24CAHM3/H is commonly used in camera modules, body control units, and sensor interfaces where ISO 16750-2 and ISO 7637-2 compliance is mandatory.
How does the SMB8J24CAHM3/H differ from unidirectional TVS diodes like SMBJ24A?
Unlike unidirectional TVS diodes such as SMBJ24A, the SMB8J24CAHM3/H is bidirectional - it protects against voltage transients of either polarity without requiring orientation during placement. This makes it ideal for AC-coupled lines (e.g., CAN, RS-485) or floating references where polarity reversal is possible. Electrically, SMB8J24CAHM3/H has identical VWM (24 V) and VC (38.9 V) but lower PPPM (800 W vs. 1000 W for unidirectional SMBJ24A), reflecting symmetrical avalanche behavior in both directions. Its SMB8J24CAHM3/H marking code "CA" explicitly denotes bidirectional configuration.
What is the thermal resistance of SMB8J24CAHM3/H, and how does it affect layout?
The SMB8J24CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This relatively high RθJA means effective PCB copper area is critical: undersized pads cause excessive junction temperature rise during repeated surges. To maintain reliability, designers must follow Vishay's recommended pad layout (0.086" min width, 0.220" ref length) and avoid thermal isolation. The SMB8J24CAHM3/H's RθJL of 20 °C/W indicates efficient heat transfer to leads - reinforcing the need for solid thermal vias under pads if ambient temperatures exceed 85 °C.
Does SMB8J24CAHM3/H require special handling during PCB assembly?
No special handling beyond standard MSL Level 1 requirements is needed for SMB8J24CAHM3/H. It is rated for peak reflow temperatures up to 260 °C per J-STD-020 and requires no baking or dry-pack storage. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102 for solderability, and it passes JESD201 Class 2 whisker testing. The SMB8J24CAHM3/H is fully compatible with lead-free SAC305 reflow profiles and automated pick-and-place systems - making it suitable for high-volume automotive electronics manufacturing without process modifications.
SMB8J24CAHM3/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:
- 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):
- 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/H FAQ
1.How can I place an order for SMB8J24CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J24CAHM3/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/H reliable?
The price and inventory of SMB8J24CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMB8J24CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J24CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J24CAHM3/H?
SMB8J24CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J24CAHM3/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/H?
For technical support, including SMB8J24CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J24CAHM3/H requirements.
6.How does Aetrix verify that SMB8J24CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J24CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMB8J24CAHM3/H?
All SMB8J24CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J24CAHM3/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/H part is unused and in its original packaging.
Return procedure for SMB8J24CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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