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Vishay General Semiconductor - Diodes Division SMBJ28A-E3/5B
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- Part No.:
- SMBJ28A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28A-E3/5B.pdf
- Description:
- TVS DIODE 28VWM 45.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,761
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Product details
Overview
SMBJ28A-E3/5B 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 industrial motor drives, automotive ECUs, and PoE-powered Ethernet interfaces.
For engineers reviewing the SMBJ28A-E3/5B datasheet, SMBJ28A-E3/5B pinout, SMBJ28A-E3/5B application, or SMBJ28A-E3/5B equivalent, key selection criteria include clamping performance under 13.2 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking (cathode band), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 28 V, it avalanches to limit transient energy by diverting surge current to ground. 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 area design for sustained 5.0 W power dissipation.
The device complies with ANSI/IEEE C62.35 surge standards and meets J-STD-020 MSL Level 1 (peak reflow 260 °C). It is rated for -55 °C to +150 °C operating junction temperature and supports repetitive surge duty cycles up to 0.01 % - making it suitable for infrequent but high-energy transients like inductive switch-off spikes in 24 V control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28 V - maximum continuous reverse working voltage before clamping initiates; defines safe DC rail margin for 24 V systems. |
| VBR (Breakdown Voltage) | 31.1–34.4 V at 1 mA - guaranteed avalanche onset range; ensures reliable triggering above normal operating voltage. |
| VC (Clamping Voltage) | 45.4 V at IPPM = 13.2 A - peak voltage seen by protected circuit during 600 W transient; critical for MOSFET gate or IC input survival. |
| PPPM (Peak Pulse Power) | 600 W with 10/1000 µs waveform - quantifies single-event surge energy handling capability per IEEE Std 1757. |
| IPPM (Peak Pulse Current) | 13.2 A - maximum non-repetitive surge current the device can safely clamp without degradation. |
| TJmax | +150 °C - maximum junction temperature; sets thermal derating limit for ambient and PCB layout design. |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; determines required heatsinking for power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by molded band; anode is opposite end. Complies with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode | Reference / ground return | Typically tied to system ground plane; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against high-energy transients such as ISO 7637-2 Pulse 1/2a in automotive 24 V systems. |
| 45.4 V clamping at 13.2 A | Limits voltage stress on downstream 30 V-rated MOSFETs or 3.3 V/5 V logic interfaces during surge events. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA) across temperature and lifetime. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| RoHS-compliant, matte tin plating | Guarantees solderability per JESD 22-B102 and whisker resistance per JESD 201 Class 2. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC supply inputs against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role / Timing Role: Shunt TVS diode placed across input terminals to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Prevents latch-up or permanent damage to 28 V-rated power management ICs during 100 V/10 A switching surges. |
Use Scenario: Input protection for LIN bus transceivers and window lift motor controllers exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Unidirectional clamping element on battery-supplied 12 V/24 V rails to suppress ISO 16750-2 pulses. Use Value: Maintains <28 V rail integrity during 35 V/100 ms load dump events, preserving CAN/LIN communication integrity. |
| Power over Ethernet (PoE) PSE | Programmable Logic Controllers (PLC) |
Use Scenario: Secondary-side DC output protection in IEEE 802.3af/at PSE power sourcing equipment delivering 48 V DC. IC Role / Device Role / Timing Role: Standoff-clamp TVS on powered device (PD) input to absorb Ethernet cable ESD and surge coupling. Use Value: Limits clamped voltage to 45.4 V, ensuring compatibility with 50 V-rated PoE interface ICs and isolation barriers. |
Use Scenario: Field I/O module protection against induced surges from nearby AC motor switching and lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Front-end transient suppressor on analog input channels and digital optocoupler supply rails. Use Value: Reduces risk of false triggering or sensor offset drift by limiting transient overshoot to <46 V on 24 V sensor excitation lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA-E3/5B | Bidirectional variant; symmetric VBR (31.1–34.4 V) in both polarities; no cathode marking. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus); not suitable for DC rail protection where polarity matters. | Select SMBJ28CA-E3/5B only when protecting balanced differential pairs or AC signals - not as direct replacement for unidirectional DC protection. |
| SMAJ28A-E3/52 | Same VWM/VC specs but lower PPPM = 400 W; SMA (DO-214AC) package with smaller footprint and higher RθJA = 140 °C/W. | Acceptable for lower-energy transients (e.g., ESD-only) or space-constrained layouts; insufficient for 600 W inductive spikes. | Choose SMAJ28A-E3/52 only if surge energy is confirmed ≤400 W and thermal budget allows higher junction temperature rise. |
Compared with SMBJ28CA-E3/5B and SMAJ28A-E3/52, the SMBJ28A-E3/5B uniquely balances 600 W surge capacity, 28 V DC standoff, and SMB package manufacturability - making it optimal for cost-sensitive, high-reliability 24 V industrial and automotive power rail protection where polarity-aware clamping is required.
Availability
SMBJ28A-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and Power over Ethernet (PoE) systems requiring stable component supply, RoHS compliance, and AEC-Q101-grade reliability assurance.
Supply support for SMBJ28A-E3/5B 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, TVS devices, and MOSFETs for high-reliability power and protection applications.
The SMBJ series was engineered for robust, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where repeatable clamping, low leakage, and automated assembly are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ28A-E3/5B at its rated peak pulse current?
The SMBJ28A-E3/5B has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A, measured with a 10/1000 µs waveform. This value defines the highest voltage the protected circuit will experience during a full 600 W transient event. The SMBJ28A-E3/5B maintains this clamping performance across its specified operating temperature range and is validated per ANSI/IEEE C62.35 test conditions.
Is SMBJ28A-E3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No - SMBJ28A-E3/5B is the commercial-grade RoHS-compliant version (suffix E3). For AEC-Q101 qualification, the correct part is SMBJ28AHE3_B/I (halogen-free, AEC-Q101 qualified, 13" reel). The SMBJ28A-E3/5B itself does not carry AEC-Q101 certification, though it shares identical electrical and thermal specifications; only the HE3/HM3 variants undergo automotive stress testing and lot traceability per AEC-Q101.
How does the SMBJ28A-E3/5B differ from the SMBJ28CA-E3/5B in circuit implementation?
The SMBJ28A-E3/5B is unidirectional and features a cathode band for polarity-sensitive DC rail protection, while the SMBJ28CA-E3/5B is bidirectional with no polarity marking and symmetric clamping in both directions. In practice, SMBJ28A-E3/5B must be oriented with cathode toward the protected line, whereas SMBJ28CA-E3/5B can be placed without orientation concern - making the latter suitable for AC or differential signal lines like RS-485, but not a drop-in replacement for DC applications.
What PCB pad layout is recommended to achieve the rated 600 W pulse power for SMBJ28A-E3/5B?
To achieve the full 600 W peak pulse power rating, Vishay specifies mounting SMBJ28A-E3/5B on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, with internal or external copper planes connected via multiple vias. Deviating from this layout increases thermal resistance and reduces effective surge current handling - e.g., using 1.5 mm × 1.5 mm pads may limit IPPM to ~9 A instead of the rated 13.2 A. The SMBJ28A-E3/5B datasheet Figure 2 provides exact derating curves versus pad area.
Does SMBJ28A-E3/5B have a specified junction capacitance for high-speed signal line protection?
No - junction capacitance is not characterized or guaranteed for the SMBJ28A-E3/5B in the official Vishay datasheet (Document Number: 88392). While typical values for similar SMBJ devices range from 100–500 pF depending on VWM, this parameter is omitted for SMBJ28A-E3/5B because it is intended for power rail and low-frequency signal protection (e.g., sensor supply, relay control), not high-speed data lines. For USB, HDMI, or Ethernet ESD protection, dedicated low-capacitance TVS arrays should be used instead of SMBJ28A-E3/5B.
SMBJ28A-E3/5B 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:
- 45.5V
- 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-E3/5B FAQ
1.How can I place an order for SMBJ28A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28A-E3/5B 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-E3/5B reliable?
The price and inventory of SMBJ28A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ28A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28A-E3/5B?
SMBJ28A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28A-E3/5B 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-E3/5B?
For technical support, including SMBJ28A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28A-E3/5B requirements.
6.How does Aetrix verify that SMBJ28A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ28A-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ28A-E3/5B?
All SMBJ28A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28A-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ28A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28A-E3/5B Tags
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