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Vishay General Semiconductor - Diodes Division SMBJ28AHM3/H
- Part No.:
- SMBJ28AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28AHM3/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,471
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Product details
Overview
SMBJ28AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 13.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ28AHM3/H datasheet, SMBJ28AHM3/H pinout, SMBJ28AHM3/H application, or SMBJ28AHM3/H equivalent, this device is evaluated for ESD and surge protection in 24 V DC systems, automotive body electronics, and I/O line hardening where low-leakage (<1 µA at VWM), fast response (<1 ns), and AEC-Q101 qualification are required.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping overvoltage protector, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling precise clamping during 10/1000 µs transients up to 13.2 A.
The SMBJ28AHM3/H is halogen-free and RoHS-compliant, qualified to AEC-Q101 for automotive use, and rated for continuous operation from –55 °C to +150 °C. Its thermal resistance (RθJA = 100 °C/W) assumes mounting on 0.2" × 0.2" copper pads, supporting reliable power dissipation in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum steady-state reverse voltage before conduction; sets operating margin for 24 V nominal DC rails. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown range ensures consistent turn-on across production lots. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamping voltage limits downstream IC stress during 600 W transient events. |
| IPPM | 13.2 A - Peak surge current capability with 10/1000 µs waveform defines protection level against lightning-induced surges. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves efficiency in always-on sensor or control circuits. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive modules and industrial motor drives without derating. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and cathode band marking. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, single-axis molded case with cathode band indicating terminal polarity. Dimensions: 5.59 mm × 4.06 mm × 2.20 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or lower-potential rail; defines clamping direction in unidirectional configuration. |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 24 V supply or CAN_H); conducts transient energy to ground during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity without external series impedance. |
| AEC-Q101 qualified | Validated for automotive applications including body control modules and power distribution units. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU ELV Directive and IPC-1752A material declaration requirements for Tier 1 automotive supply chains. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up in protected CMOS ICs. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking. |
Applications
| Automotive Body Control Module | Industrial 24 V PLC Input |
|---|---|
|
Use Scenario: Protecting microcontroller GPIO and LIN bus transceivers from load dump and alternator ripple in door module ECUs. IC Role / Device Role / Timing Role: Unidirectional clamping element placed between 24 V supply rail and ground, triggered within <1 ns of overvoltage onset. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to 5 V logic-level interface ICs rated for 36 V absolute maximum. |
Use Scenario: Hardening digital input channels of programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff protector on 24 V optocoupler input side, absorbing repetitive 10/1000 µs transients up to 600 W. Use Value: Maintains <1 µA leakage at 24 V, ensuring clean signal detection while surviving >100,000 surge events per IEC 61000-4-5. |
| DC Motor Drive Power Stage | Automotive Camera Power Line |
|
Use Scenario: Suppressing inductive kickback from brushed DC motor commutation in seat/mirror actuators. IC Role / Device Role / Timing Role: Parallel-connected TVS across H-bridge high-side FET drain-source, clamping voltage spikes during PWM switching. Use Value: Withstands 100 A non-repetitive forward surge (IFSM), protecting MOSFETs from avalanche failure during stall conditions. |
Use Scenario: Shielding 12 V power input of ADAS camera modules from ISO 7637-2 Pulse 5a load dump events. IC Role / Device Role / Timing Role: Primary front-end protector on camera power rail, positioned upstream of DC/DC converter input. Use Value: AEC-Q101 qualification and 150 °C junction rating ensure reliability in sealed, thermally constrained camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28AHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable for commercial automotive modules where halogen content is unrestricted. | Select SMBJ28AHE3/H if halogen-free requirement is waived and cost optimization is prioritized. |
| SMAJ28A-HF | Lower 400 W PPPM rating; SMA package (smaller footprint, higher RθJA = 140 °C/W). | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 3 or automotive load dump. | Choose SMAJ28A-HF only for space-constrained consumer electronics with sub-400 W surge exposure. |
Compared with SMBJ28AHE3/H, the SMBJ28AHM3/H adds halogen-free compliance without sacrificing clamping performance or thermal robustness; versus SMAJ28A-HF, it delivers 50% higher surge power handling and superior thermal management for demanding industrial and automotive deployments.
Availability
SMBJ28AHM3/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC inputs, DC motor drive protection, and ADAS camera power line hardening requiring stable component supply and long-term lifecycle assurance.
Supply support for SMBJ28AHM3/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, AEC-Q qualification, and high-volume manufacturability.
The SMBJ series was engineered for robust transient suppression in automotive and industrial environments, delivering standardized 600 W surge capability in the widely adopted SMB package with strict process control for VBR consistency and low leakage.
FAQ
What is the clamping voltage of SMBJ28AHM3/H at its rated peak pulse current?
The SMBJ28AHM3/H has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A with a 10/1000 µs waveform. This value is measured under standard test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ28AHM3/H maintains this clamping performance across its full operating temperature range.
Is SMBJ28AHM3/H suitable for automotive applications?
Yes, SMBJ28AHM3/H is AEC-Q101 qualified and specifically designated for automotive use with the "HM3" suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is deployed in body control modules, power distribution units, and ADAS camera power rails where sustained operation up to +150 °C and immunity to load dump transients are required. The SMBJ28AHM3/H meets all stress test requirements defined in the AEC-Q101 standard.
How does the SMBJ28AHM3/H differ from the SMBJ28A-E3/H variant?
The SMBJ28AHM3/H differs from SMBJ28A-E3/H in material composition and qualification: HM3 denotes halogen-free and AEC-Q101 qualified construction, whereas E3 is RoHS-compliant but not halogen-free and lacks AEC-Q101 validation. Electrically, both share identical VWM, VBR, VC, and PPPM ratings. The SMBJ28AHM3/H is specified for automotive Tier 1 supply chains requiring halogen-free compliance per IPC-1752A and ELV directives.
What is the maximum reverse leakage current of SMBJ28AHM3/H at its stand-off voltage?
The SMBJ28AHM3/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 28 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal power loss in always-on circuits such as automotive wake-up receivers or industrial sensor bias networks. Leakage remains below 5 µA up to +125 °C, preserving system efficiency across the full operating range.
Can SMBJ28AHM3/H be used in bidirectional configurations?
No, SMBJ28AHM3/H is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., SMBJ28CA). Using SMBJ28AHM3/H in reverse-biased AC signal paths would result in forward conduction and potential failure. For bidirectional protection on data lines like RS-485 or CAN, select the SMBJ28CA variant instead of SMBJ28AHM3/H.
SMBJ28AHM3/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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 13.2A
- 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)
SMBJ28AHM3/H FAQ
1.How can I place an order for SMBJ28AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28AHM3/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 SMBJ28AHM3/H reliable?
The price and inventory of SMBJ28AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28AHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ28AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28AHM3/H?
SMBJ28AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28AHM3/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 SMBJ28AHM3/H?
For technical support, including SMBJ28AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28AHM3/H requirements.
6.How does Aetrix verify that SMBJ28AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ28AHM3/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 SMBJ28AHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ28AHM3/H?
All SMBJ28AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28AHM3/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 SMBJ28AHM3/H part is unused and in its original packaging.
Return procedure for SMBJ28AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28AHM3/H Tags
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