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Vishay General Semiconductor - Diodes Division SMBJ28HE3/5B
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- Part No.:
- SMBJ28HE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28HE3/5B.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,832
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Product details
Overview
SMBJ28HE3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in 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 SMBJ28HE3/5B datasheet, SMBJ28HE3/5B pinout, SMBJ28HE3/5B application, or SMBJ28HE3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and packaging details for tape-and-reel delivery (3200 pcs per 13" reel).
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation, it remains high-impedance until transient voltage exceeds VWM (28 V), then avalanches rapidly to clamp at ≤45.4 V. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), while the SMB package supports automated SMT placement and meets UL 94 V-0 flammability.
Rated for 100 A non-repetitive forward surge (8.3 ms half-sine), it sustains repetitive transients at 0.01% duty cycle. Thermal performance is defined by RθJL = 20 °C/W (junction-to-lead) and derating above 25 °C ambient per Figure 2 - critical for sustained surge handling in enclosed industrial enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - precise avalanche threshold ensuring consistent turn-on across production lots. |
| VC @ IPPM | 45.4 V at 13.2 A - clamped voltage under 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 600 W - peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 4 surges. |
| IFSM | 100 A - single half-sine surge rating (8.3 ms); supports motor drive or relay coil switching events. |
| TJ range | –55 °C to +150 °C - extended junction temperature range enables under-hood automotive use. |
| RθJA | 100 °C/W - thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VWM. |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or lower-potential rail; completes clamping current path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients per ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 without degradation. |
| Glass passivated junction | Ensures stable VBR tolerance (±5%), low leakage (<1.0 µA), and long-term reliability under thermal cycling. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no moisture sensitivity handling required pre-assembly. |
| UL 94 V-0 molding compound | Meets flame-retardancy requirements for industrial and transportation equipment safety certifications. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and downstream DC/DC converter input. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to 36 V-rated input stages while surviving 100 A surge events. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules from ESD and field wiring transients. IC Role / Device Role / Timing Role: Low-capacitance clamping element on signal lines, positioned adjacent to connector entry points. Use Value: Sub-100 ps response time and <1.0 µA leakage preserve signal integrity and accuracy in 16-bit measurement systems. |
| Telecom DC Power Input Protection | Motor Drive Control Signal Protection |
|
Use Scenario: Safeguarding -48 V DC power inputs in base station power distribution units from lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on bulk power feed, upstream of hot-swap controllers and POL regulators. Use Value: 600 W rating and 13.2 A IPPM enable compliance with GR-1089-CORE Level 3 surge immunity requirements. |
Use Scenario: Guarding gate drive signals (e.g., PWM to MOSFET drivers) in HVAC inverter boards against cross-talk and shoot-through induced transients. IC Role / Device Role / Timing Role: Fast-response shunt protector on isolated gate driver output traces. Use Value: Clamps transients within 1 ns, preventing false triggering or latch-up in high-side/low-side driver ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A-E3/5B | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and SMB package. | Not suitable for automotive OEM or Tier-1 production; acceptable for industrial or consumer prototypes. | Select SMBJ28A-E3/5B if AEC-Q101 is not mandated and cost optimization is prioritized. |
| SMCJ28AHE3/5B | Higher 1500 W PPPM; larger SMC (DO-214AB) package; same VWM/VC but 23.5 A IPPM. | Used where higher surge energy (e.g., outdoor telecom cabinets) demands greater margin than 600 W. | Choose SMCJ28AHE3/5B when system-level surge testing exceeds IEC 61000-4-5 Level 4 or requires >1 kA surge headroom. |
Compared with SMBJ28A-E3/5B, SMBJ28HE3/5B adds automotive qualification without altering electrical behavior; versus SMCJ28AHE3/5B, it trades surge capacity for smaller footprint and lower thermal mass - ideal for space-constrained automotive modules requiring validated reliability.
Availability
SMBJ28HE3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial I/O protection, and telecom power supply designs requiring stable component supply, AEC-Q101 compliance, and RoHS-compliant manufacturing.
Supply support for SMBJ28HE3/5B 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 harsh environments - engineered for automotive, industrial, and telecom applications where surge immunity and long-term stability are mission-critical.
FAQ
What is the clamping voltage of SMBJ28HE3/5B at its rated peak pulse current?
The SMBJ28HE3/5B has a maximum clamping voltage (VC) of 45.4 V at 13.2 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards. The SMBJ28HE3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ28HE3/5B qualified for automotive applications?
Yes, SMBJ28HE3/5B is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88392 (Revision 09-Jan-2024). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating its use in engine control units, body electronics, and ADAS subsystems. The SMBJ28HE3/5B meets automotive reliability requirements without derating.
What is the thermal resistance of SMBJ28HE3/5B, and how does it affect PCB layout?
The SMBJ28HE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value assumes standard FR-4 board material and influences required copper area: doubling pad size reduces RθJA by ~15–20%, directly improving surge repetition capability. For continuous operation near 5.0 W power dissipation, thermal vias and inner-layer copper pours are recommended. The SMBJ28HE3/5B's RθJL of 20 °C/W further supports heat conduction through leads.
How does SMBJ28HE3/5B differ from bidirectional variants like SMBJ28CA?
SMBJ28HE3/5B is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where reverse voltage is blocked. In contrast, SMBJ28CA is bidirectional - symmetrical in both directions, no polarity marking, and used in AC-coupled or floating signal lines. Their VWM (28 V) and VC (45.4 V) match, but SMBJ28HE3/5B supports 100 A forward surge (IFSM), while SMBJ28CA does not specify IFSM. The SMBJ28HE3/5B is not interchangeable with SMBJ28CA without circuit redesign.
What packaging format is supplied for SMBJ28HE3/5B, and what is the reel quantity?
SMBJ28HE3/5B is supplied in 13-inch diameter plastic tape-and-reel packaging with a base quantity of 3200 pieces per reel, as specified in Vishay's ordering information (package code "5B"). This format supports high-speed automated pick-and-place assembly and complies with EIA-481 standards. The tape features embossed pockets, cover tape sealing, and orientation marking aligned with the cathode band. Traceability data, including lot code and date code, is printed on the reel label for the SMBJ28HE3/5B.
SMBJ28HE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 12A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ28HE3/5B FAQ
1.How can I place an order for SMBJ28HE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28HE3/5B 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 SMBJ28HE3/5B reliable?
The price and inventory of SMBJ28HE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28HE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ28HE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28HE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28HE3/5B?
SMBJ28HE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28HE3/5B 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 SMBJ28HE3/5B?
For technical support, including SMBJ28HE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28HE3/5B requirements.
6.How does Aetrix verify that SMBJ28HE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ28HE3/5B 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 SMBJ28HE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ28HE3/5B?
All SMBJ28HE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28HE3/5B, 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 SMBJ28HE3/5B part is unused and in its original packaging.
Return procedure for SMBJ28HE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28HE3/5B Tags
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