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Vishay General Semiconductor - Diodes Division SMBJ28-E3/5B
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- Part No.:
- SMBJ28-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28-E3/5B.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ28-E3/5B 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 motor drives.
For engineers reviewing the SMBJ28-E3/5B datasheet, SMBJ28-E3/5B pinout, SMBJ28-E3/5B application, or SMBJ28-E3/5B equivalent, key selection criteria include its unidirectional polarity, 1.0 µA max reverse leakage at 28 V, -55 °C to +150 °C operating junction temperature range, and RoHS-compliant matte tin-plated leads suitable for automated SMT assembly.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal conditions it presents high impedance (>1 GΩ) below VWM, then avalanches sharply above VBR to clamp transient energy into ground. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance (≈3.4 Ω, derived from ΔVC/ΔIPPM).
Thermal design relies on its RθJA = 100 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W, enabling reliable operation up to 150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and supports reflow profiles with peak solder temperature ≤260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin for 24 V DC systems. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Tight 10.6% tolerance ensures predictable turn-on across production lots. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamping voltage limits downstream component stress during 600 W transient events. |
| IPPM | 13.2 A - Peak pulse current capacity with 10/1000 µs waveform; determines protection level against lightning-induced surges. |
| Leakage ID | 1.0 µA max at 28 V - Low leakage preserves battery life and avoids false triggering in low-power sensor circuits. |
| TJ Range | -55 °C to +150 °C - Enables deployment in automotive engine bays and industrial outdoor enclosures without derating. |
| Package | SMB (DO-214AA) - 3.94 mm × 2.13 mm footprint with cathode band marking; compatible with standard 0.5 mm pitch SMT pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode indicated by a band on the case body. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; completes clamping loop when transient exceeds VBR. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V rail or sensor output); avalanche conduction occurs from cathode to anode. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Handles IEC 61000-4-5 Level 4 surge events (4 kV/2 Ω) on 24 V lines without degradation. |
| Fast response time < 1.0 ps | Clamps transients before sensitive CMOS inputs experience overvoltage damage. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without popcorn cracking or parameter shift. |
| RoHS-compliant, halogen-free option available | Meets IPC-1752A material declaration requirements for automotive and industrial OEMs. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensors against inductive kickback from 24 V solenoid coils and BLDC motor phases. IC Role / Device Role / Timing Role: Shunt clamping element placed between power rail and ground, activated within picoseconds of overvoltage onset. Use Value: Limits voltage excursion to ≤45.4 V, preventing latch-up or oxide rupture in 30 V-rated MOSFETs and op-amps. |
Use Scenario: Guarding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Standby-mode protector with <1 µA leakage, activated only during >31.1 V events lasting ≥10 µs. Use Value: Maintains bus integrity during ISO 7637-2 Pulse 5a (load dump) while adding zero static power burden. |
| Factory Automation Sensors | Telecom Power Supply Inputs |
|
Use Scenario: Shielding 4–20 mA current-loop transmitters and RS-485 nodes from ESD and cable discharge events in dusty, high-noise plants. IC Role / Device Role / Timing Role: First-line defense at connector entry point, diverting >8 kV HBM ESD pulses to chassis ground. Use Value: Prevents field failures caused by cumulative degradation of analog front-end amplifiers due to repeated sub-clamping transients. |
Use Scenario: Secondary overvoltage protection on AC/DC adapter outputs feeding FPGA and ASIC core rails. IC Role / Device Role / Timing Role: Redundant clamping stage after primary MOV-based surge suppression, handling residual ringwave energy. Use Value: Extends system MTBF by absorbing 600 W transient bursts that bypass upstream filtering, avoiding brownout resets. |
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 | Same electrical specs and package; identical part - "SMBJ28A-E3/5B" is the full base P/N; "SMBJ28-E3/5B" is a documented variant alias per Vishay ordering matrix. | No functional difference; both target 24 V DC system protection with identical clamping behavior. | Select SMBJ28A-E3/5B when strict BOM alignment with Vishay's published base numbering is required. |
| SMCJ28A-E3/57T | Higher 1500 W peak power rating, larger SMC (DO-214AB) package (7.11 mm × 6.22 mm), 48.4 V clamping at 25.5 A. | Better suited for higher-energy threats (e.g., IEC 61000-4-5 Level 5), but requires PCB area increase and layout revision. | Choose SMCJ28A-E3/57T only if test requirements exceed 600 W or if existing design has margin for larger footprint. |
Compared with SMBJ28A-E3/5B (identical function) and SMCJ28A-E3/57T (higher power, larger size), SMBJ28-E3/5B delivers optimal space-constrained protection for 24 V industrial and automotive subsystems where 600 W clamping suffices and board real estate is premium.
Availability
SMBJ28-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, factory automation sensors, and telecom power supply inputs requiring stable component supply across multi-year production cycles.
Supply support for SMBJ28-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, MOSFETs, and protection devices with emphasis on reliability, thermal performance, and AEC-Q qualification.
The SMBJ series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and communications equipment - engineered for robustness under repetitive surge stress and extended temperature operation.
FAQ
What is the clamping voltage of SMBJ28-E3/5B at its rated peak pulse current?
The SMBJ28-E3/5B has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated 13.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ28-E3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ28-E3/5B RoHS-compliant and lead-free?
Yes, SMBJ28-E3/5B is RoHS-compliant and lead-free, as confirmed by the "E3" suffix in its part number per Vishay's ordering nomenclature. It uses matte tin-plated leads and meets JESD 201 Class 2 whisker resistance requirements. The molding compound complies with UL 94 V-0 flammability rating, and full compliance documentation is available under Vishay's material categorization system (doc?99912). SMBJ28-E3/5B contains no restricted substances above threshold limits.
Does SMBJ28-E3/5B meet AEC-Q101 qualification?
No, SMBJ28-E3/5B is not AEC-Q101 qualified. It carries the commercial-grade "E3" suffix; AEC-Q101 versions use "HE3" or "HM3" suffixes (e.g., SMBJ28AHE3_B/I). While SMBJ28-E3/5B shares the same die and basic construction, it lacks the extended stress testing (including high-temperature reverse bias, temperature cycling, and ESD) required for automotive qualification. For automotive applications requiring AEC-Q101, specify SMBJ28AHE3_B/I instead of SMBJ28-E3/5B.
What is the thermal resistance from junction to ambient for SMBJ28-E3/5B?
The typical thermal resistance from junction to ambient (RθJA) for SMBJ28-E3/5B is 100 °C/W, measured on a standard 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad layout per JEDEC standards. This value assumes no additional heatsinking and defines the temperature rise above ambient per watt of steady-state power dissipation. For pulsed operation, transient thermal impedance curves (Figure 5 in doc 88392) govern short-duration heating effects. SMBJ28-E3/5B's RθJL is 20 °C/W, supporting efficient heat transfer to PCB traces.
How does SMBJ28-E3/5B differ from bidirectional variants like SMBJ28CA?
SMBJ28-E3/5B is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse voltage is blocked. In contrast, SMBJ28CA is bidirectional - symmetrical in both directions, with no polarity marking - and used for AC signal lines or differential buses like RS-485. Their VBR and VC values differ: SMBJ28CA has lower VBR (≈25.4–28.1 V) and higher VC (≈48.4 V), making SMBJ28-E3/5B preferable for precise 24 V rail clamping where reverse conduction must be avoided.
SMBJ28-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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ28-E3/5B FAQ
1.How can I place an order for SMBJ28-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28-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 SMBJ28-E3/5B reliable?
The price and inventory of SMBJ28-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 SMBJ28-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ28-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28-E3/5B?
SMBJ28-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28-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 SMBJ28-E3/5B?
For technical support, including SMBJ28-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28-E3/5B requirements.
6.How does Aetrix verify that SMBJ28-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ28-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 SMBJ28-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ28-E3/5B?
All SMBJ28-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28-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 SMBJ28-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ28-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28-E3/5B Tags
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