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Vishay General Semiconductor - Diodes Division SMBJ28CA-M3/52
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- Part No.:
- SMBJ28CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CA-M3/52.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,393
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Product details
Overview
SMBJ28CA-M3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power 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 and telecom line cards.
For engineers reviewing the SMBJ28CA-M3/52 datasheet, SMBJ28CA-M3/52 pinout, SMBJ28CA-M3/52 application, or SMBJ28CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.62), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design for sustained surge handling.
The device meets J-STD-020 MSL Level 1, supports peak forward surge current up to 100 A (8.3 ms half-sine, unidirectional only - not applicable here), and exhibits a temperature coefficient of VBR of +0.098 %/°C - critical for precision clamping stability across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - verified breakdown threshold ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 45.4 V at 13.2 A - clamping voltage under 10/1000 µs surge; limits downstream component stress to <46 V. |
| PPPM | 600 W - peak pulse power handling per single transient; validated with 0.01 % duty cycle repetitive testing. |
| IPPM | 13.2 A - maximum non-repetitive peak pulse current supported with standard PCB mounting (0.2" × 0.2" copper pads). |
| Junction Temp Range | -55 °C to +150 °C - enables deployment in automotive engine bays, industrial motor drives, and outdoor telecom enclosures. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm max length, 4.06 mm max width, and 2.20 mm max height. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either direction) | One end of symmetrical P-N junction; accepts surge current regardless of polarity - no cathode band marking. |
| Cathode | Transient current exit (either direction) | Other end of symmetrical P-N junction; completes bidirectional conduction path during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without external polarity management circuitry. |
| 600 W peak pulse power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 1/2/5a) on 24 V bus lines with minimal derating. |
| Halogen-free & RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements and environmental compliance for global industrial shipments. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates bake-out requirement and simplifies SMT line logistics. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing via level-shifting circuits. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) Power Inputs |
|---|---|
|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Bidirectional TVS placed between input terminal and ground to clamp ±1 kV EFT bursts and 100 V switching spikes. Use Value: Prevents latch-up or permanent damage to optocoupler input stages and microcontroller GPIOs by limiting transient voltage to ≤45.4 V. |
Use Scenario: Safeguarding 12 V/24 V power rails feeding microcontrollers and CAN transceivers in body control modules exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary clamping device on main supply rail, coordinated with upstream fuse and downstream LC filtering. Use Value: Withstands 600 W surges per ISO 16750-2 while maintaining VC below 46 V - within absolute maximum rating of most 5 V LDOs and 3.3 V MCUs. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Interface |
|
Use Scenario: Shielding RS-485 transceiver terminals on base station line cards from lightning-induced surges on long-distance twisted-pair cabling. IC Role / Device Role / Timing Role: Differential-mode TVS across A/B lines, paired with common-mode chokes and GDTs for full IEC 61000-4-5 Level 4 compliance. Use Value: Sub-1 ns response time and 45.4 V clamping ensure transceiver ICs (e.g., THVD1550) remain within safe operating area during 4 kV surge events. |
Use Scenario: Protecting microcontroller GPIOs driving H-bridge gate drivers in washing machine motor control boards subjected to brush-commutator noise and power cycling transients. IC Role / Device Role / Timing Role: Localized TVS at MCU output pins and gate driver enable inputs to suppress coupled noise from motor windings. Use Value: Low leakage (<1 µA) avoids false triggering of logic signals; SMB footprint allows placement directly adjacent to sensitive control nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA-E3/52 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (not halogen-free). | Acceptable for commercial-grade designs where halogen-free certification is not mandated (e.g., non-EU consumer goods). | Select when cost sensitivity outweighs halogen-free requirement and MSL Level 1 compliance remains essential. |
| SMAJ28CA-M3 | Lower 400 W PPPM, higher VC = 49.9 V at 8.5 A, SMA package (smaller thermal mass). | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 2 Ω source impedance tests. | Choose only for space-constrained designs with verified <400 W surge exposure and adequate margin above 49.9 V. |
Compared with SMBJ28CA-E3/52, the M3 variant adds halogen-free compliance without sacrificing surge rating or thermal performance; versus SMAJ28CA-M3, SMBJ28CA-M3 delivers 50 % higher peak power handling and tighter clamping - making it the preferred choice for industrial and automotive front-end protection.
Availability
SMBJ28CA-M3/52 is available at Aetrix Electronics and suitable for industrial PLCs, automotive BCMs, telecom line cards, and appliance motor control systems requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance.
Supply support for SMBJ28CA-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 AEC-Q qualification.
The SMBJ series targets robust transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where consistent clamping behavior and long-term parametric stability are mandatory.
FAQ
What is the clamping voltage of SMBJ28CA-M3/52 under a 10/1000 µs surge?
The SMBJ28CA-M3/52 has a maximum clamping voltage (VC) of 45.4 V at 13.2 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ28CA-M3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ28CA-M3/52 suitable for automotive applications?
SMBJ28CA-M3/52 is halogen-free and RoHS-compliant but not AEC-Q101 qualified in this M3/52 configuration. For automotive use, Vishay offers the HM3 variant (e.g., SMBJ28CAHM3_B/H), which adds AEC-Q101 qualification. The SMBJ28CA-M3/52 remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated - such as infotainment power rails or lighting control modules - provided system-level validation confirms robustness.
How does the bidirectional nature of SMBJ28CA-M3/52 affect its PCB layout?
The SMBJ28CA-M3/52 has no polarity marking and conducts identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout by removing the need for silkscreen polarity indicators or automated vision alignment checks. Layout must still follow Vishay's recommended 0.2" × 0.2" copper pad dimensions per terminal to sustain rated 600 W surge performance - especially critical for ground plane integrity and thermal dissipation.
What is the maximum leakage current of SMBJ28CA-M3/52 at its stand-off voltage?
At VWM = 28 V and TA = 25 °C, the SMBJ28CA-M3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA. This low leakage ensures minimal power loss in always-on circuits and prevents false triggering of high-impedance monitoring inputs. Leakage remains below 5 µA up to 80 % of VWM, supporting reliable operation in battery-backed or energy-harvesting systems where quiescent current is tightly constrained.
Can SMBJ28CA-M3/52 be used in place of a unidirectional TVS like SMBJ28A-M3/52?
No - SMBJ28CA-M3/52 is strictly bidirectional and cannot replace unidirectional variants like SMBJ28A-M3/52 in DC-biased circuits requiring cathode-anode polarity control. Attempting substitution may result in unintended conduction during normal forward bias or failure to clamp negative transients. The "CA" suffix explicitly denotes bidirectional construction; unidirectional types use "A" and feature a cathode band. Always verify circuit topology and transient polarity before selecting SMBJ28CA-M3/52.
SMBJ28CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ28CA-M3/52 FAQ
1.How can I place an order for SMBJ28CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CA-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 SMBJ28CA-M3/52 reliable?
The price and inventory of SMBJ28CA-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 SMBJ28CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ28CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CA-M3/52?
SMBJ28CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CA-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 SMBJ28CA-M3/52?
For technical support, including SMBJ28CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ28CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ28CA-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 SMBJ28CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ28CA-M3/52?
All SMBJ28CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CA-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 SMBJ28CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ28CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CA-M3/52 Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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