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Vishay General Semiconductor - Diodes Division SMBJ28AHM3_B/I
- Part No.:
- SMBJ28AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28AHM3_B/I.pdf
- Description:
- 600W,28V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,400
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Product details
Overview
SMBJ28AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails 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 - deployed in automotive ECUs, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMBJ28AHM3_B/I datasheet, SMBJ28AHM3_B/I pinout, SMBJ28AHM3_B/I application, or SMBJ28AHM3_B/I equivalent, this page delivers verified electrical specs, thermal behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world clamping performance data essential for surge immunity validation and board-level ESD/transient design.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped crowbar device: it remains high-impedance below VWM = 28 V, then rapidly avalanches above VBR to limit transient energy. Its low incremental surge resistance (typical <0.5 Ω) ensures minimal voltage overshoot during fast transients like ISO 7637-2 pulse 1/2a/5a.
Designed for automotive-grade reliability, SMBJ28AHM3_B/I meets AEC-Q101 stress testing requirements and is halogen-free (HM3 suffix), with MSL Level 1 moisture sensitivity and 150 °C max junction temperature - enabling use in under-hood power conditioning without derating penalties up to +125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets upper limit for protected circuit DC rail. |
| VBR @ IT = 1 mA | 31.1–34.4 V - Breakdown threshold range defining reliable avalanche initiation; tight tolerance enables predictable clamping onset. |
| VC @ IPPM = 13.2 A | 45.4 V - Clamped voltage during 10/1000 µs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capacity; supports repeated 13.2 A surges at 0.01% duty cycle without degradation. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; defines safe power dissipation limits at elevated ambient. |
| TJmax | +150 °C - Absolute maximum junction temperature; allows operation in engine-control or industrial motor-drive environments. |
| AEC-Q101 Qualified | Yes - Validated per automotive stress test standards including HTOL, TCT, HAST, and ESD-HBM/MM; suitable for ASIL-B systems. |
Pinout & Package
Package: SMB (DO-214AA) - surface-mount plastic case with matte tin-plated leads, 0.220" × 0.155" footprint, MSL Level 1, compatible with reflow soldering per J-STD-020 (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point | Connected to protected line; polarity marking ensures correct orientation for unidirectional clamping to ground. |
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path; completes clamping loop during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables suppression of severe load-dump and inductive-switching transients common in 24 V automotive systems. |
| 45.4 V clamping voltage at 13.2 A | Keeps protected 24 V logic rails within safe operating margin of 3.3 V/5 V microcontrollers and CAN transceivers. |
| AEC-Q101 qualified & halogen-free (HM3) | Meets automotive OEM sourcing mandates and environmental compliance (RoHS, JEDEC JESD201 Class 2 whisker resistance). |
| Low RθJA = 100 °C/W | Supports sustained 5.0 W power dissipation on standard PCB pads - eliminates need for thermal vias in space-constrained layouts. |
| Fast response time & low capacitance | Sub-nanosecond turn-on and <100 pF junction capacitance preserve signal integrity on high-speed sensor lines (e.g., LIN, analog inputs). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply input of body control module against ISO 7637-2 pulse 5a (load dump up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC/DC input, conducting only during overvoltage events. Use Value: Limits peak voltage to ≤45.4 V, preventing damage to upstream buck converter ICs rated for 48 V absolute max input. |
Use Scenario: Safeguarding analog output of pressure sensor in factory automation PLC I/O module exposed to relay coil flyback. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting transient energy from 0–10 V analog line to ground before reaching ADC front-end. Use Value: Maintains signal fidelity with <100 pF capacitance while clamping 1 kV/µs spikes to <50 V, avoiding ADC saturation or latch-up. |
| Telecom DC Power Input Protection | Motor Drive Control Signal Protection |
|
Use Scenario: Securing -48 V DC input of VoIP gateway against lightning-induced surges on telecom lines. IC Role / Device Role / Timing Role: Reverse-biased unidirectional TVS referenced to chassis ground, absorbing common-mode transients coupled onto power bus. Use Value: Withstands 600 W pulses without degradation, ensuring >100,000 surge cycles in field-deployed equipment. |
Use Scenario: Shielding PWM enable signal (3.3 V logic) of BLDC gate driver from cross-talk and MOSFET switching noise. IC Role / Device Role / Timing Role: Fast-response TVS placed at driver IC input pin, clamping EFT bursts (IEC 61000-4-4) before logic threshold violation. Use Value: Sub-ns response prevents false triggering; 1 µA leakage at 28 V avoids loading sensitive CMOS inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28AHE3_B/I | Same electrical specs and SMB package, but RoHS-compliant commercial grade (E3) - not AEC-Q101 qualified or halogen-free. | Limited to non-automotive industrial/commercial designs where automotive qualification and halogen-free materials are not required. | Select when cost sensitivity outweighs automotive compliance needs and halogen restrictions do not apply. |
| SMCJ28A-QH | Higher 1500 W PPPM, larger SMC (DO-214AB) package, same VWM/VC - physically incompatible due to 0.295" × 0.230" footprint. | Suitable for higher-energy surge environments (e.g., outdoor telecom cabinets), but requires PCB layout change. | Choose only if 600 W is insufficient and board redesign is acceptable; otherwise, SMBJ28AHM3_B/I offers optimal size/power balance. |
Compared with SMBJ28AHE3_B/I, SMBJ28AHM3_B/I adds AEC-Q101 qualification and halogen-free construction for automotive use; compared with SMCJ28A-QH, it trades 2.5× peak power for 40% smaller footprint - making SMBJ28AHM3_B/I the preferred choice for space-constrained, automotive-grade 24 V rail protection.
Availability
SMBJ28AHM3_B/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power input protection requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ28AHM3_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 optimization.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ28AHM3_B/I at its rated peak pulse current?
The SMBJ28AHM3_B/I has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across temperature and ensures downstream components see no more than 45.4 V during worst-case transients - critical for protecting 48 V-tolerant ICs in 24 V systems. The SMBJ28AHM3_B/I maintains this clamping performance over its full operating junction temperature range (-55 °C to +150 °C).
Is SMBJ28AHM3_B/I suitable for automotive applications?
Yes, SMBJ28AHM3_B/I is AEC-Q101 qualified and specifically designed for automotive use - validated for high-temperature operation, thermal cycling, humidity exposure, and mechanical shock per automotive stress test standards. Its HM3 suffix confirms halogen-free, RoHS-compliant construction meeting OEM material requirements. The SMBJ28AHM3_B/I is commonly deployed in engine control units, ADAS camera modules, and infotainment power supplies where ISO 7637-2 and ISO 16750-2 compliance is required.
What does the "HM3_B/I" suffix indicate in SMBJ28AHM3_B/I?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance; "B" indicates revision level B per Vishay's internal documentation; "I" specifies packaging in 13-inch tape-and-reel format with 3200 units per reel. This full suffix confirms SMBJ28AHM3_B/I meets automotive-grade material, reliability, and logistics requirements - distinguishing it from commercial-grade variants like SMBJ28A-E3/5B.
How does SMBJ28AHM3_B/I compare to bidirectional TVS diodes in the same family?
SMBJ28AHM3_B/I is unidirectional and intended for DC rail protection where polarity is fixed - it conducts only during positive overvoltage relative to ground. Bidirectional variants (e.g., SMBJ28CA) provide symmetrical clamping for AC or floating lines but exhibit higher leakage and reduced VBR consistency. For 24 V automotive power inputs, SMBJ28AHM3_B/I delivers tighter VBR tolerance (31.1–34.4 V), lower leakage (<1 µA at 28 V), and superior clamping efficiency - making it the preferred choice over bidirectional alternatives unless AC coupling or polarity-agnostic protection is required.
What is the thermal resistance and power derating behavior of SMBJ28AHM3_B/I?
SMBJ28AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. Its 5.0 W steady-state power dissipation (PD) is linearly derated above 50 °C ambient, dropping to zero at 150 °C - matching its TJmax. Derating curves (Fig. 2 in Vishay Doc #88392) confirm 80% PD retention at 80 °C ambient. This behavior allows SMBJ28AHM3_B/I to sustain continuous operation in under-hood environments without forced cooling or oversized heatsinks.
SMBJ28AHM3_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:
- 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_B/I FAQ
1.How can I place an order for SMBJ28AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28AHM3_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 SMBJ28AHM3_B/I reliable?
The price and inventory of SMBJ28AHM3_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 SMBJ28AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ28AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28AHM3_B/I?
SMBJ28AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28AHM3_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 SMBJ28AHM3_B/I?
For technical support, including SMBJ28AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ28AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28AHM3_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 SMBJ28AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ28AHM3_B/I?
All SMBJ28AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28AHM3_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 SMBJ28AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ28AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28AHM3_B/I Tags
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