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Vishay General Semiconductor - Diodes Division SMBJ24CAHM3_B/I
- Part No.:
- SMBJ24CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24CAHM3_B/I.pdf
- Description:
- 600W,24V,5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,682
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Product details
Overview
SMBJ24CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 24 V standoff voltage (VWM), 38.9 V maximum clamping voltage (VC) at 15.4 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed on power rails and signal lines in industrial sensor interfaces and automotive ECUs.
For engineers reviewing the SMBJ24CAHM3_B/I datasheet, SMBJ24CAHM3_B/I pinout, SMBJ24CAHM3_B/I application, or SMBJ24CAHM3_B/I equivalent, key selection considerations include its bidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates symmetrically in both directions, with breakdown voltage (VBR) specified between 26.7 V (min) and 29.5 V (max) at 1.0 mA test current. Its clamping behavior ensures rapid voltage limiting during transients induced by inductive switching or ESD events, maintaining system integrity without forward conduction.
The device uses a glass-passivated silicon junction and is rated for operating junction temperatures from –55 °C to +150 °C. It meets MSL Level 1 per J-STD-020, with a maximum lead finish temperature of 260 °C, supporting standard reflow soldering processes without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage before clamping begins |
| VBR (min/max) | 26.7 V / 29.5 V - Breakdown occurs within this range at 1.0 mA, defining turn-on threshold |
| VC @ IPPM | 38.9 V - Clamped voltage seen by protected circuit during 15.4 A 10/1000 µs surge |
| PPPM | 600 W - Peak transient power it can absorb without failure, critical for lightning/inductive spike immunity |
| IPPM | 15.4 A - Maximum non-repetitive surge current it safely diverts under standardized waveform |
| TJ max. | +150 °C - Maximum junction temperature enabling reliable operation in under-hood or industrial enclosures |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction with matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | One terminal of symmetrical junction; accepts surge current in either direction |
| Cathode | Transient current exit (reverse bias) | Second terminal; completes bidirectional conduction path with Anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional suppression | Protects AC-coupled or floating signal lines without polarity concerns - e.g., RS-485, CAN bus, sensor bridges |
| AEC-Q101 qualified (HM3) | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per stress test requirements |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for end-of-life recycling and regulatory reporting in EU, China, and North America |
| 600 W peak pulse power | Withstands high-energy transients such as ISO 7637-2 Pulse 1/2a/5a in automotive power nets and IEC 61000-4-5 surges in industrial I/O |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during clamping - preserves margin for 24 V logic and microcontroller I/O tolerance |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input rail to clamp surges above 38.9 V while remaining inert below 24 V. Use Value: Prevents damage to downstream DC/DC converters and MCU power supplies during ISO 16750-2 load dump events. | Use Scenario: Shielding analog outputs of pressure or temperature sensors connected to PLC analog inputs. IC Role / Device Role / Timing Role: Placed differentially across sensor output pair to suppress ESD and fast transients without loading the signal. Use Value: Maintains signal fidelity (<1 nA leakage at 24 V) while surviving 8 kV contact ESD per IEC 61000-4-2. |
| Telecom Interface Protection | Motor Drive Feedback Circuit Protection |
Use Scenario: Safeguarding RS-485 transceiver pins in outdoor base station equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Connected line-to-line and line-to-ground to limit differential and common-mode transients simultaneously. Use Value: Enables compliance with ITU-T K.21 basic protection level using single-device bidirectional architecture. | Use Scenario: Protecting Hall-effect sensor feedback lines in BLDC motor controllers subject to commutation noise. IC Role / Device Role / Timing Role: Mounted directly at sensor connector to shunt high-frequency ringing (>100 MHz) before reaching MCU ADC inputs. Use Value: Reduces false triggering and measurement drift caused by >1 kV/µs dv/dt transients on motor phase nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CAHE3_B/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial/industrial use only; not approved for automotive production | Select when halogen content or automotive qualification is not required and cost optimization is prioritized |
| SMCJ24CAHM3_A/I | Larger SMC (DO-214AB) package; higher 1500 W PPPM; same VWM/VC ratings | Used where higher surge energy handling is needed, e.g., main power entry or battery disconnect circuits | Choose when board space allows larger footprint and system-level surge testing exceeds 600 W requirements |
Compared with SMBJ24CAHM3_B/I, the HE3 variant trades halogen-free and automotive qualification for lower cost, while the SMCJ24CAHM3_A/I offers 2.5× higher surge capacity in a larger package - enabling tiered protection architecture across subsystems.
Availability
SMBJ24CAHM3_B/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom infrastructure projects requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ24CAHM3_B/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series targets high-reliability transient suppression in space-constrained, thermally demanding environments - engineered specifically for automotive, industrial automation, and communications systems needing certified, repeatable clamping behavior.
FAQ
What does the "CA" suffix indicate in SMBJ24CAHM3_B/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ24CAHM3_B/I conducts and clamps symmetrically in both polarities, unlike unidirectional "A" variants that only protect against reverse-voltage transients. This makes SMBJ24CAHM3_B/I ideal for AC-coupled or floating signal paths such as RS-485, CAN, or bridge sensor outputs where polarity reversal may occur.
Is SMBJ24CAHM3_B/I qualified for automotive applications?
Yes, SMBJ24CAHM3_B/I carries the HM3 suffix, confirming it is halogen-free, RoHS-compliant, and AEC-Q101 qualified. This certification covers stress tests including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing - validating SMBJ24CAHM3_B/I for use in engine control units, ADAS modules, and other automotive electronic systems.
What is the maximum clamping voltage of SMBJ24CAHM3_B/I under surge conditions?
The maximum clamping voltage (VC) of SMBJ24CAHM3_B/I is 38.9 V when subjected to its rated peak pulse current of 15.4 A under the standard 10/1000 µs waveform. This value is guaranteed across temperature and lifetime, ensuring protected circuits see no more than 38.9 V during worst-case transients - critical for safeguarding 24 V-rated ICs and microcontrollers.
How does the SMB (DO-214AA) package of SMBJ24CAHM3_B/I compare to SMC (DO-214AB)?
The SMB package of SMBJ24CAHM3_B/I measures 4.57 mm × 3.94 mm × 2.29 mm, offering ~40 % smaller footprint than the SMC (DO-214AB) package. While SMBJ24CAHM3_B/I delivers 600 W peak power, the physically larger SMC variant (e.g., SMCJ24CA) supports up to 1500 W - so SMBJ24CAHM3_B/I is selected when board space is constrained and 600 W surge immunity suffices.
What is the leakage current specification for SMBJ24CAHM3_B/I at its working voltage?
At its maximum reverse standoff voltage of 24 V (VWM), SMBJ24CAHM3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C. This ultra-low leakage ensures minimal power loss and signal interference in always-on sensor interfaces or battery-backed systems where standby current budget is critical - a key advantage over higher-leakage alternatives.
SMBJ24CAHM3_B/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:
- Active
- 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):
- 15.4A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ24CAHM3_B/I FAQ
1.How can I place an order for SMBJ24CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24CAHM3_B/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 SMBJ24CAHM3_B/I reliable?
The price and inventory of SMBJ24CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ24CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24CAHM3_B/I?
SMBJ24CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24CAHM3_B/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 SMBJ24CAHM3_B/I?
For technical support, including SMBJ24CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ24CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ24CAHM3_B/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 SMBJ24CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ24CAHM3_B/I?
All SMBJ24CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24CAHM3_B/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 SMBJ24CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ24CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24CAHM3_B/I Tags
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