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Vishay General Semiconductor - Diodes Division SMBJ28A-M3/52
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- Part No.:
- SMBJ28A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28A-M3/52.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,102
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Product details
Overview
SMBJ28A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge 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 - deployed in industrial sensor interfaces and automotive body electronics for robust overvoltage protection.
For engineers reviewing the SMBJ28A-M3/52 datasheet, SMBJ28A-M3/52 pinout, SMBJ28A-M3/52 application, or SMBJ28A-M3/52 equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamping device in parallel with protected circuitry, entering avalanche conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping performance across repetitive surges.
The SMBJ28A-M3/52 delivers sub-nanosecond response time and meets MSL Level 1 per J-STD-020 (260 °C peak reflow), supporting high-reliability assembly. Its thermal resistance (RθJA = 100 °C/W) and 5.0 W steady-state power dissipation are validated on 5.0 mm × 5.0 mm copper pads - critical for thermal management in compact industrial power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Ensures predictable turn-on margin above VWM; ±5% tolerance supports tight system-level margining. |
| VC @ IPPM | 45.4 V at 13.2 A (10/1000 µs) - Clamped voltage seen by downstream ICs during worst-case surge; limits stress on 3.3 V/5 V logic rails. |
| PPPM | 600 W - Peak transient energy absorption capacity; sustains 0.01% duty cycle surges without degradation. |
| IPPM | 13.2 A - Maximum non-repetitive surge current handled at rated waveform; determines minimum trace width and fuse coordination. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm pads; informs derating above 25 °C ambient. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads solderable per J-STD-002/JESD 22-B102. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during positive transients. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V supply rail); avalanche conduction initiates here during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity without external series impedance in many 24 V systems. |
| 45.4 V clamping voltage at 13.2 A | Keeps downstream 3.3 V/5 V logic ICs within absolute maximum ratings during 1 kV/500 A surge events. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures long-term VBR stability and low leakage (<1 µA) after 1000+ surge cycles. |
| Halogen-free, RoHS-compliant (M3) | Fulfills EU Directive 2011/65/EU Annex II and IPC-1752A material declaration requirements for industrial OEMs. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (CAN/LIN) in factory-floor pressure/temperature sensors exposed to relay coil flyback and ESD. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed directly at connector entry point to divert transients before reaching precision ADC or microcontroller GPIO. Use Value: Prevents latch-up or permanent damage to 12-bit SAR ADCs and ARM Cortex-M0+ MCUs during 1 kV contact ESD per IEC 61000-4-2. |
Use Scenario: Safeguarding 12 V power inputs and switch sense lines in door module ECUs subjected to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on fused battery feed, coordinated with upstream polyfuse to limit energy delivery during sustained overvoltage. Use Value: Limits peak voltage to ≤45.4 V during 35 V/100 ms load dump, preserving 32-bit SBCs and CAN transceivers rated for 40 V absolute max. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
|
Use Scenario: Suppressing lightning-induced surges on AC/DC adapter DC outputs feeding PoE-powered Ethernet switches and base stations. IC Role / Device Role / Timing Role: Secondary-stage TVS on +48 V DC bus, downstream of primary MOV and common-mode choke, handling residual differential-mode transients. Use Value: Clamps 600 W surges within 1 ns to protect isolated DC/DC controllers and optocouplers without adding propagation delay to feedback loops. |
Use Scenario: Shielding microcontroller I/O and gate driver inputs in washing machine motor control boards from brush-commutator noise and relay bounce. IC Role / Device Role / Timing Role: Localized clamp on H-bridge enable lines and hall-effect sensor VCC rails, placed within 5 mm of protected pins. Use Value: Eliminates false triggering of overcurrent shutdown in DRV8305 gate drivers during 500 V/µs edge transients from BLDC commutation. |
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-E3/52 | Same electrical specs and SMB package; RoHS-compliant but not halogen-free (E3 vs. M3). | Acceptable where halogen-free requirement is waived; identical thermal and clamping performance. | Select SMBJ28A-E3/52 for cost-sensitive commercial designs without green-material mandates. |
| SMAJ28A-M3 | Lower 400 W PPPM, higher VC = 49.9 V at 10.7 A; SMA (DO-214AC) package with smaller footprint and lower thermal mass. | Limited to lower-energy transients (e.g., IEC 61000-4-2 ±8 kV air, not ISO 7637-2 Pulse 5a). | Choose SMAJ28A-M3 only when board space is constrained and surge threat level is below 400 W. |
Compared with SMBJ28A-E3/52, the SMBJ28A-M3/52 provides halogen-free compliance without sacrificing clamping performance or thermal capability; versus SMAJ28A-M3, it delivers 50% higher surge energy handling and tighter thermal design margin due to larger SMB package and lower RθJA.
Availability
SMBJ28A-M3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom power supply inputs, and consumer appliance motor drives requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance.
Supply support for SMBJ28A-M3/52 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, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting industrial automation, automotive electronics, and telecom infrastructure where robustness against ESD, lightning, and inductive switching surges is mandatory.
FAQ
What is the maximum clamping voltage of SMBJ28A-M3/52 under a 10/1000 µs surge?
The SMBJ28A-M3/52 has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 13.2 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 45.4 V during such transients - critical for protecting 3.3 V or 5 V logic circuits. The SMBJ28A-M3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBJ28A-M3/52 suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ28A-M3/52 is not AEC-Q101 qualified. It is a commercial-grade, halogen-free RoHS-compliant part (M3 suffix). For automotive use, Vishay offers the SMBJ28AHM3_X variant (e.g., SMBJ28AHM3_B/H), which adds AEC-Q101 qualification while retaining identical electrical specs and SMB packaging. The SMBJ28A-M3/52 remains appropriate for non-automotive industrial and telecom applications where AEC-Q101 is not mandated.
How does the SMBJ28A-M3/52 differ from the SMAJ28A-M3 in terms of surge handling?
The SMBJ28A-M3/52 delivers 600 W peak pulse power (10/1000 µs), whereas the SMAJ28A-M3 is rated for 400 W - a 50% higher energy absorption capacity. This translates to a lower clamping voltage (45.4 V vs. 49.9 V) at higher surge current (13.2 A vs. 10.7 A) and better thermal robustness due to the larger SMB (DO-214AA) package. The SMBJ28A-M3/52 is preferred for ISO 7637-2 Pulse 5a load dump protection; SMAJ28A-M3 suits lighter-duty IEC 61000-4-2 ESD scenarios.
What is the reverse leakage current specification for SMBJ28A-M3/52 at its stand-off voltage?
At its 28 V stand-off voltage (VWM) and 25 °C ambient temperature, the SMBJ28A-M3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage minimizes standby power loss in always-on systems like smart sensors and battery-backed controllers. Leakage remains below 5 µA up to +85 °C, ensuring stable operation in industrial enclosures without unintended biasing of sensitive analog front-ends.
Can SMBJ28A-M3/52 be used in bidirectional protection configurations?
No, SMBJ28A-M3/52 is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection, Vishay specifies the SMBJ28CA variant (e.g., SMBJ28CA-M3/52), which provides symmetrical clamping in both polarities and is used in AC signal lines or differential buses like RS-485. Using SMBJ28A-M3/52 in reverse-biased mode risks permanent junction damage due to lack of reverse breakdown specification - always match polarity to application topology.
SMBJ28A-M3/52 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-M3/52 FAQ
1.How can I place an order for SMBJ28A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28A-M3/52 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-M3/52 reliable?
The price and inventory of SMBJ28A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ28A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28A-M3/52?
SMBJ28A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28A-M3/52 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-M3/52?
For technical support, including SMBJ28A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28A-M3/52 requirements.
6.How does Aetrix verify that SMBJ28A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ28A-M3/52 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-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ28A-M3/52?
All SMBJ28A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28A-M3/52, 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-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ28A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28A-M3/52 Tags
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