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Vishay General Semiconductor - Diodes Division SMBJ24CAHM3/I
- Part No.:
- SMBJ24CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24CAHM3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
SMBJ24CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the 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 capability with a 10/1000 µs waveform-used to protect MOSFETs, sensor interfaces, and industrial I/O circuits against ESD and inductive switching surges.
For engineers reviewing the SMBJ24CAHM3/I datasheet, SMBJ24CAHM3/I pinout, SMBJ24CAHM3/I application, or SMBJ24CAHM3/I equivalent, this device is selected for robust bidirectional surge protection where low clamping ratio, AEC-Q101 qualification, halogen-free compliance, and MSL Level 1 reflow compatibility are required in automotive and industrial environments.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 26.7 V and 29.5 V at 1 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.
The device uses a glass-passivated silicon junction, exhibits <1 ns response time, and maintains thermal stability with RθJA = 100 °C/W and TJ(max) = +150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before conduction begins; sets safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1 mA - Confirmed bidirectional breakdown range; ensures reliable triggering above system transients but below damage thresholds. |
| VC @ IPPM | 38.9 V at 15.4 A - Clamped voltage during 600 W surge event; limits downstream IC stress to safe levels in 24 V rail protection. |
| PPPM | 600 W - Peak pulse power handling per 10/1000 µs waveform; supports repetitive surge events at 0.01 % duty cycle. |
| IPPM | 15.4 A - Peak surge current capacity; determines minimum trace width and PCB copper pad sizing (0.2" × 0.2") for thermal management. |
| TJ(max) | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial enclosures. |
| MSL Level | Level 1 (per J-STD-020) - Supports standard reflow profiles up to 260 °C peak without preconditioning; simplifies SMT assembly. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 (cathode band side not applicable) | Bidirectional terminal - functions as anode in one polarity, cathode in the other; requires symmetric PCB layout with equal trace impedance. |
| Cathode | Terminal 2 (cathode band side not applicable) | Bidirectional terminal - identical electrical role to Anode; no marking distinguishes terminals; mounting orientation does not affect function. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables protection against high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without derating in compact SMB footprint. |
| AEC-Q101 qualified | Validated for automotive electronics including engine control modules and body controllers where reliability under thermal cycling and vibration is mandatory. |
| Halogen-free & RoHS-compliant (HM3) | Meets EU ELV and China RoHS requirements; eliminates brominated flame retardants while maintaining UL 94 V-0 molding compound rating. |
| Low clamping ratio (VC/VBR(min) ≈ 1.46) | Minimizes overvoltage exposure to protected ICs-critical for 3.3 V/5 V logic interfacing with 24 V supply domains. |
| 100 % surge-tested | Each unit verified at IPPM to ensure clamping consistency; eliminates field failures due to parameter drift in production lots. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protects microcontroller GPIO and CAN transceiver bias lines from load dump and alternator ripple in 24 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed at connector interface to shunt transients before reaching sensitive analog front-end or level-shifting circuitry. Use Value: Maintains VC ≤ 38.9 V during 120 V/50 ms load dump events, preventing latch-up or gate oxide rupture in 5 V-tolerant MCU pins. |
Use Scenario: Shields 24 V dry-contact inputs on programmable logic controller I/O modules from relay coil flyback and ESD during field wiring. IC Role / Device Role / Timing Role: Primary surge suppression device mounted directly at terminal block entry point, upstream of optocoupler input stage. Use Value: Limits transient overshoot to <40 V, ensuring optocoupler LED forward voltage remains within safe conduction range and avoids false triggering. |
| Telecom Power Supply Monitoring | Medical Sensor Signal Conditioning |
|
Use Scenario: Guards voltage supervisor ICs and ADC reference inputs in telecom rectifier monitoring boards exposed to lightning-induced surges on -48 V DC distribution lines. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp placed across sense resistor network and supervisor enable pin. Use Value: Responds in <1 ns to clamp 1 kV/1 µs transients, preserving ±0.5 % reference accuracy and preventing brownout resets during surge events. |
Use Scenario: Safeguards low-noise instrumentation amplifiers and SAR ADC inputs in portable patient monitors connected to external transducers via unshielded cables. IC Role / Device Role / Timing Role: Localized ESD protection at connector interface, co-located with RC filter to preserve signal integrity up to 100 kHz. Use Value: Delivers <1 pF junction capacitance (typ.) and sub-39 V clamping, avoiding gain error or bandwidth reduction in mV-level biopotential signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CAHE3/I | Same electrical specs, but RoHS-compliant without halogen-free certification; uses standard epoxy molding compound. | Approved for commercial/industrial use; not certified for automotive under AEC-Q101. | Select when halogen-free requirement is waived and cost optimization is prioritized over automotive qualification. |
| SMCJ24CAHM3/I | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM rating. | Used where higher surge energy (e.g., IEC 61000-4-5 Level 4) or improved thermal dissipation is needed. | Choose when board space allows and system-level surge testing exceeds 600 W requirements-no PCB redesign needed beyond pad layout. |
Compared with SMBJ24CAHM3/I, SMBJ24CAHE3/I offers identical protection performance without halogen-free assurance, while SMCJ24CAHM3/I provides 2.5× higher surge power in a larger footprint-enabling scalability from board-level to system-level transient immunity without changing circuit topology.
Availability
SMBJ24CAHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and medical sensor interface designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified surge suppression.
Supply support for SMBJ24CAHM3/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, and protection devices with emphasis on reliability, precision, and application-specific validation.
The SMBJ series was developed for high-reliability surface-mount transient suppression in automotive, industrial, and telecom infrastructure-prioritizing low clamping voltage, fast response, and robust reflow survivability.
FAQ
What is the clamping voltage of SMBJ24CAHM3/I at its rated peak pulse current?
The SMBJ24CAHM3/I has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 15.4 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees predictable overvoltage limiting during surge events-critical for protecting downstream 3.3 V or 5 V logic components connected to a 24 V supply domain. The SMBJ24CAHM3/I achieves this with a clamping ratio of approximately 1.46 relative to its minimum breakdown voltage.
Is SMBJ24CAHM3/I suitable for automotive applications?
Yes, SMBJ24CAHM3/I is AEC-Q101 qualified and specifically designed for automotive use cases such as body control modules, lighting drivers, and sensor interfaces. Its halogen-free (HM3) construction, MSL Level 1 reflow rating, and guaranteed operation from –55 °C to +150 °C junction temperature meet stringent automotive environmental and manufacturing requirements. The SMBJ24CAHM3/I is listed in Vishay's automotive-grade product portfolio with full qualification test reports available upon request.
How does the bidirectional configuration of SMBJ24CAHM3/I affect PCB layout?
The SMBJ24CAHM3/I has no polarity marking and functions identically in both directions, so PCB layout requires symmetric trace routing and equal copper area on both terminals to maintain balanced surge current sharing. Unlike unidirectional TVS diodes, there is no cathode band to align-orientation is arbitrary. However, thermal pad design must follow Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to sustain its 600 W pulse rating without overheating. This applies equally to SMBJ24CAHM3/I in all placements.
What is the difference between SMBJ24CAHM3/I and SMBJ24CAHE3/I?
SMBJ24CAHM3/I and SMBJ24CAHE3/I share identical electrical parameters-including VWM = 24 V, VBR = 26.7–29.5 V, and VC = 38.9 V-but differ in material compliance: HM3 denotes halogen-free and AEC-Q101 qualified construction, whereas HE3 is RoHS-compliant but not halogen-free or automotive-qualified. Both use the same SMB (DO-214AA) package and are drop-in replacements electrically; however, SMBJ24CAHM3/I is required for automotive Tier 1 supply chains and green electronics mandates where brominated compounds are prohibited.
Does SMBJ24CAHM3/I require derating at elevated ambient temperatures?
Yes, SMBJ24CAHM3/I must be derated above 25 °C ambient per Figure 2 in the Vishay datasheet (Document Number: 88392). Its peak pulse power decreases linearly with rising junction temperature-e.g., at 85 °C ambient with standard PCB layout, usable PPPM drops to ~420 W. Derating is calculated using RθJA = 100 °C/W and TJ(max) = 150 °C. Designers must verify thermal margins using actual board layout and airflow; SMBJ24CAHM3/I's thermal resistance values are validated on 0.2" × 0.2" copper pads per terminal.
SMBJ24CAHM3/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:
- 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/I FAQ
1.How can I place an order for SMBJ24CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24CAHM3/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/I reliable?
The price and inventory of SMBJ24CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ24CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24CAHM3/I?
SMBJ24CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24CAHM3/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/I?
For technical support, including SMBJ24CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24CAHM3/I requirements.
6.How does Aetrix verify that SMBJ24CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ24CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ24CAHM3/I?
All SMBJ24CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ24CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24CAHM3/I Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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