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Vishay General Semiconductor - Diodes Division SMBJ24CAHM3/H
- Part No.:
- SMBJ24CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24CAHM3/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,679
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Product details
Overview
SMBJ24CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 24 V stand-off voltage (VWM), 38.9 V maximum clamping voltage (VC) at 15.4 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial motor drives and telecom line cards.
For engineers reviewing the SMBJ24CAHM3/H datasheet, SMBJ24CAHM3/H pinout, SMBJ24CAHM3/H application, or SMBJ24CAHM3/H equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low leakage (<1.0 µA at VWM), and AEC-Q101 qualification (via HM3 suffix) are required in space-constrained PCB layouts.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 26.7 V (min) and 29.5 V (max) at 1.0 mA test current. Its clamping behavior is defined under standardized 10/1000 µs surge conditions, delivering consistent VC ≤ 38.9 V up to IPPM = 15.4 A.
Thermally, it exhibits RθJA = 100 °C/W and RθJL = 20 °C/W, enabling reliable operation up to TJ = +150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - critical for automotive body electronics and industrial control modules requiring long-term reliability under thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before significant conduction begins; sets safe margin below system rail. |
| VBR (min/max) | 26.7 V / 29.5 V at 1.0 mA - Ensures predictable turn-on during overvoltage events without premature triggering. |
| VC @ IPPM | 38.9 V at 15.4 A - Limits downstream voltage stress during 600 W transient surges, protecting 3.3 V/5 V/24 V logic and power stages. |
| IPPM | 15.4 A - Peak surge current capability with 10/1000 µs waveform; supports IEC 61000-4-5 Level 3 (1 kV/2 kV) compliance testing. |
| Leakage (ID) | <1.0 µA at 24 V - Negligible standby power loss and signal integrity impact on high-impedance sensor or communication lines. |
| Package | SMB (DO-214AA) - 0.205" × 0.130" footprint; compatible with automated SMT placement and meets UL 94 V-0 flammability. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102. Molding compound meets UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts during negative-going surges; symmetrical with cathode for full bidirectional clamping. |
| Cathode | Transient current entry (positive half-cycle) | Conducts during positive-going surges; identical electrical behavior to anode due to bidirectional design. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without degradation in SMB footprint. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage exposure to protected ICs - critical for 24 V microcontrollers and CAN transceivers. |
| Fast response time (<1 ps) | Clamps ESD events (IEC 61000-4-2) before sensitive circuitry sustains damage. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive and industrial environmental compliance mandates without compromising surge performance. |
| MSL Level 1 (260 °C peak) | Enables single-pass reflow assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensing lines against inductive kickback from 24 V DC motors. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across motor driver outputs and current-sense shunts. Use Value: Limits transient spikes to ≤38.9 V, preventing latch-up or gate oxide rupture in MOSFETs and op-amps. |
Use Scenario: Surge suppression on LIN bus and power supply inputs in door module ECUs exposed to load dump. IC Role / Device Role / Timing Role: Primary TVS on 12 V/24 V rails and LIN data lines, operating alongside AEC-Q101-qualified controllers. Use Value: Withstands repetitive 10/1000 µs surges up to 600 W while maintaining <1 µA leakage at 24 V standby. |
| Telecom Line Cards | Industrial Sensor Interfaces |
|
Use Scenario: Input protection for Ethernet PHY power supplies and auxiliary DC-DC converters in outdoor base stations. IC Role / Device Role / Timing Role: Secondary-level TVS after primary GDT or MOV, providing precise clamping before LDOs and PHY ICs. Use Value: Clamps induced lightning surges to safe levels (≤38.9 V) without affecting 48 V PoE power integrity. |
Use Scenario: ESD and EFT protection on analog output lines (4–20 mA) and digital I/O of pressure/temperature sensors. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp directly at connector interface, minimizing signal distortion. Use Value: Sub-1 µA leakage preserves accuracy of µA-level sensor current loops; fast response prevents ADC saturation. |
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/H | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; not AEC-Q101 qualified. | Suitable for commercial/industrial use only; not approved for automotive underhood or chassis modules. | Select when AEC-Q101 is not required and cost optimization is prioritized over halogen-free compliance. |
| SMAJ24CAHM3 | Lower 400 W PPPM rating; same VWM/VC but reduced IPPM (10.3 A); SMA (DO-214AC) package - smaller footprint (0.175" × 0.120"). | Better suited for low-energy ESD-only protection; insufficient for IEC 61000-4-5 Level 4 or load-dump scenarios. | Choose only if board space is severely constrained and surge energy remains below 400 W. |
Compared with SMBJ24CAHE3/H, the SMBJ24CAHM3/H adds halogen-free and AEC-Q101 qualification without altering clamping performance; versus SMAJ24CAHM3, it delivers 50 % higher surge power handling in a slightly larger but more thermally robust SMB package.
Availability
SMBJ24CAHM3/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom line cards requiring stable component supply with guaranteed long-term sourcing and automotive-grade traceability.
Supply support for SMBJ24CAHM3/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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMBJ series targets high-reliability transient suppression in automotive, industrial, and telecom systems - engineered for repeatable clamping performance under thermal stress and surge repetition.
FAQ
What is the clamping voltage of SMBJ24CAHM3/H under maximum rated surge current?
The SMBJ24CAHM3/H has a maximum clamping voltage (VC) of 38.9 V when subjected to its peak pulse current (IPPM) of 15.4 A using the standardized 10/1000 µs waveform. This value is measured at TA = 25 °C on 0.2" × 0.2" copper pads and ensures downstream components remain within safe operating voltage limits during surge events. The SMBJ24CAHM3/H maintains this clamping performance across its full operating junction temperature range.
Is SMBJ24CAHM3/H suitable for automotive applications?
Yes, SMBJ24CAHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix indicating halogen-free, RoHS-compliant construction and full automotive reliability testing. It is approved for use in body electronics, lighting modules, and power distribution units where transient immunity and long-term stability under thermal cycling are mandatory. The SMBJ24CAHM3/H meets all stress tests including HTGB, HTRB, and temperature humidity bias.
How does SMBJ24CAHM3/H differ from unidirectional SMBJ24AHM3/H?
The SMBJ24CAHM3/H is bidirectional, meaning it clamps voltage transients of either polarity symmetrically - essential for AC-coupled lines or floating references. In contrast, SMBJ24AHM3/H is unidirectional with a cathode band marking and conducts only during positive surges. Both share identical VWM (24 V), VC (38.9 V), and PPPM (600 W), but SMBJ24CAHM3/H has no polarity marking and double the reverse leakage limit (1.0 µA vs. 5.0 µA for unidirectional at same VWM).
What is the thermal resistance of SMBJ24CAHM3/H, and how does it affect layout?
SMBJ24CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. To maintain TJ ≤ 150 °C under worst-case power dissipation, PCB layout must use minimum recommended 0.2" × 0.2" copper pads per terminal. Reducing pad size or omitting thermal vias increases junction temperature and degrades surge endurance - verified in Vishay's Fig. 2 derating curves.
Can SMBJ24CAHM3/H replace SMBJ24A in an existing design?
No - SMBJ24CAHM3/H is bidirectional while SMBJ24A is unidirectional; substituting without circuit review risks improper clamping during negative transients. Additionally, SMBJ24A uses "E3" or "M3" suffixes and lacks AEC-Q101 qualification. If bidirectional protection is required, SMBJ24CAHM3/H is appropriate; if unidirectional operation is intended, SMBJ24AHM3/H (not SMBJ24A) is the AEC-Q101-compliant counterpart to SMBJ24A.
SMBJ24CAHM3/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):
- 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/H FAQ
1.How can I place an order for SMBJ24CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24CAHM3/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 SMBJ24CAHM3/H reliable?
The price and inventory of SMBJ24CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ24CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24CAHM3/H?
SMBJ24CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24CAHM3/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 SMBJ24CAHM3/H?
For technical support, including SMBJ24CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24CAHM3/H requirements.
6.How does Aetrix verify that SMBJ24CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ24CAHM3/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 SMBJ24CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ24CAHM3/H?
All SMBJ24CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24CAHM3/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 SMBJ24CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ24CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24CAHM3/H Tags
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