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Vishay General Semiconductor - Diodes Division SMBJ28A-M3/5B
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- Part No.:
- SMBJ28A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28A-M3/5B.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,603
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Product details
Overview
SMBJ28A-M3/5B 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 SMBJ28A-M3/5B datasheet, SMBJ28A-M3/5B pinout, SMBJ28A-M3/5B application, or SMBJ28A-M3/5B equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature, and halogen-free RoHS-compliant construction per M3 suffix - critical for automotive-grade and high-reliability embedded designs.
Technical Context
This TVS diode operates as a voltage-clamping protection device, conducting only when reverse voltage exceeds its breakdown threshold (31.1–34.4 V). Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, lightning-induced surges, and inductive switching transients on DC rails and low-speed signal paths.
The SMBJ28A-M3/5B uses a glass-passivated silicon junction and is rated for 100 A non-repetitive forward surge current (IFSM) under 8.3 ms half-sine wave. Thermal resistance is 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for full 600 W pulse handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamped voltage seen by protected circuit during 10/1000 µs surge; limits stress on downstream components. |
| PPPM | 600 W - Peak pulse power dissipation capability with 10/1000 µs waveform; determines transient energy absorption capacity. |
| IPPM | 13.2 A - Peak pulse current corresponding to VC; used to size PCB trace width and verify system-level surge compliance. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in high-ambient environments like motor drives and power converters. |
| Leakage @ VWM | 1.0 µA - Low reverse leakage minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection point for unidirectional clamping | Connected to protected line (e.g., +12 V rail); conducts surge current to ground when overvoltage occurs. |
| Anode | Low-side reference terminal | Typically tied to system ground or return path; completes clamping loop during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 24 V industrial buses without derating. |
| 45.4 V clamping voltage at 13.2 A | Keeps downstream 3.3 V/5 V logic ICs and gate drivers within safe absolute maximum ratings during surge events. |
| Glass passivated junction | Ensures stable VBR performance across temperature (-55 °C to +150 °C) and long-term reliability in humid environments. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing for high-volume production. |
| Halogen-free & RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements and EU environmental compliance for automotive and industrial end equipment. |
Applications
| Industrial Motor Drive Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Suppresses inductive kickback from relay coils and solenoid drivers in PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed across 24 V DC coil supply to limit flyback voltage to ≤45.4 V. Use Value: Prevents damage to driving MOSFETs and microcontroller GPIOs while maintaining <1 µA leakage during steady-state operation. |
Use Scenario: Protects LIN bus transceivers and microcontroller power pins from load dump and jump-start transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail upstream of LDO regulators feeding BCM MCU. Use Value: Clamps 12 V rail to 45.4 V during ISO 7637-2 Pulse 5a (35 V, 400 ms), preserving regulator input safety margin. |
| Telecom Power Supply Input | Consumer Appliance Sensor Interface |
|
Use Scenario: Shields AC/DC adapter secondary-side 24 V output from induced surges on long interconnect cables. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC output before connector interface to remote equipment. Use Value: Absorbs 600 W transient energy without degradation, enabling compliance with EN 61000-4-5 (4 kV line-earth). |
Use Scenario: Guards analog temperature and current sense inputs in smart HVAC controllers against ESD and cable discharge. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on 3.3 V sensor supply line adjacent to ADC input traces. Use Value: Limits clamping voltage to 45.4 V while adding <1 pF parasitic capacitance - no signal integrity impact on 10 kHz sensor bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3). | Acceptable for commercial-grade products where halogen-free requirement is not mandated. | Select SMBJ28A-E3/5B for cost-sensitive consumer applications without halogen restrictions. |
| SMBJ28AHM3_B/I | AEC-Q101 qualified; identical VWM, VBR, VC, and PPPM, but with automotive qualification testing and traceability. | Required for automotive ECUs subject to OEM PPAP and long-term reliability validation. | Choose SMBJ28AHM3_B/I when functional safety (ISO 26262) or automotive qualification is mandatory. |
Compared with SMBJ28A-E3/5B and SMBJ28AHM3_B/I, the SMBJ28A-M3/5B provides halogen-free compliance without automotive qualification - making it optimal for industrial and medical equipment where environmental compliance and thermal robustness are prioritized over AEC-Q101 certification.
Availability
SMBJ28A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and consumer appliance sensor interfaces requiring stable component supply and halogen-free compliance.
Supply support for SMBJ28A-M3/5B 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed for high-energy transient suppression in space-constrained surface-mount applications, targeting industrial automation, automotive subsystems, and power conversion systems demanding consistent clamping performance and long-term stability.
FAQ
What is the maximum clamping voltage of SMBJ28A-M3/5B at its rated peak pulse current?
The SMBJ28A-M3/5B has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ28A-M3/5B maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) due to its glass-passivated junction structure.
Is SMBJ28A-M3/5B suitable for automotive applications?
The SMBJ28A-M3/5B is halogen-free and RoHS-compliant but not AEC-Q101 qualified. It may be used in non-safety-critical automotive subsystems such as infotainment power rails or lighting controls where qualification is not mandated. For body control modules or ADAS-related functions requiring automotive grade reliability, the AEC-Q101-qualified variant SMBJ28AHM3_B/I is recommended instead of SMBJ28A-M3/5B.
What is the reverse leakage current specification for SMBJ28A-M3/5B at its stand-off voltage?
The SMBJ28A-M3/5B specifies a maximum reverse leakage current (ID) of 1.0 µA at its 28 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage ensures minimal power loss in always-on circuits and avoids interference with high-impedance sensor bias networks. Leakage remains below 5 µA up to +125 °C, supporting stable operation in thermally demanding environments.
Does SMBJ28A-M3/5B have bidirectional capability?
No, SMBJ28A-M3/5B is a unidirectional transient voltage suppressor. Its cathode band identifies the polarity, and it conducts only during reverse-biased overvoltage conditions. For bidirectional protection, the SMBJ28CA variant must be selected - which shares the same package and power rating but provides symmetrical clamping in both directions. The SMBJ28A-M3/5B is intended for DC rail protection where polarity is fixed.
What PCB pad layout is required to achieve the full 600 W peak pulse rating for SMBJ28A-M3/5B?
To achieve the full 600 W peak pulse power rating, SMBJ28A-M3/5B must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Smaller pads reduce thermal dissipation and cause derating of pulse power capability. The SMBJ28A-M3/5B's RθJA of 100 °C/W assumes this layout; using internal layers or thermal vias further improves sustained surge handling in high-duty-cycle applications.
SMBJ28A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ28A-M3/5B FAQ
1.How can I place an order for SMBJ28A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28A-M3/5B 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 SMBJ28A-M3/5B reliable?
The price and inventory of SMBJ28A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ28A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28A-M3/5B?
SMBJ28A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28A-M3/5B 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 SMBJ28A-M3/5B?
For technical support, including SMBJ28A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28A-M3/5B requirements.
6.How does Aetrix verify that SMBJ28A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ28A-M3/5B 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 SMBJ28A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ28A-M3/5B?
All SMBJ28A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28A-M3/5B, 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 SMBJ28A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ28A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28A-M3/5B Tags
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