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Vishay General Semiconductor - Diodes Division SMBJ43-E3/5B
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- Part No.:
- SMBJ43-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43-E3/5B.pdf
- Description:
- TVS DIODE 43VWM 76.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,274
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Product details
Overview
SMBJ43-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 sensitive electronics. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 8.6 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines of industrial motor drives.
For engineers reviewing the SMBJ43-E3/5B datasheet, SMBJ43-E3/5B pinout, SMBJ43-E3/5B application, or SMBJ43-E3/5B equivalent, key selection criteria include clamping performance under 8.6 A surge, thermal resistance (RθJA = 100 °C/W), RoHS-compliant commercial-grade qualification, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, responding within <1 ps to transient overvoltages induced by inductive load switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the cathode-band polarity marking enables correct orientation during PCB assembly.
The device is rated for -55 °C to +150 °C operating junction temperature, supports 100 A non-repetitive forward surge current (IFSM), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is not AEC-Q101 qualified - the HE3/HM3 suffix variants are required for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below system rail voltage. |
| VBR (min/max) | 47.8 V / 52.8 V at IT = 1 mA - guaranteed avalanche onset range; ensures predictable turn-on across production lots. |
| VC @ IPPM | 69.4 V at 8.6 A - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - peak pulse power handling capability; validates suitability for IEC 61000-4-5 Level 3/4 surge immunity designs. |
| ID @ VWM | 1.0 µA - reverse leakage at 43 V; negligible power loss and minimal impact on high-impedance sensor bias networks. |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| Package | SMB (DO-214AA) - industry-standard 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), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by black band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., VCC, signal); conducts surge current to ground when VIN exceeds VBR. |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge test requirements up to 4 kV (line-earth) without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during transients, protecting 48 V-rated MOSFETs and microcontrollers with 70 V absolute max ratings. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure in industrial environments. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without popcorn cracking or parameter shift; no pre-baking required. |
| RoHS-compliant, halogen-free option available | E3 suffix indicates commercial-grade RoHS compliance; M3 suffix adds halogen-free molding compound for green manufacturing programs. |
Applications
| Industrial Motor Drive Power Supply | Automated Test Equipment (ATE) Signal Lines |
|---|---|
|
Use Scenario: Protecting 48 V DC bus inputs against back-EMF spikes from brushed DC motor commutation and contactor switching. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between VIN and GND, absorbing repetitive 100–500 A, 10 µs–100 µs inductive surges. Use Value: Limits bus voltage excursions to ≤69.4 V, preventing damage to upstream DC/DC converters and downstream gate drivers rated for 75 V max. |
Use Scenario: Shielding analog input channels (0–10 V, ±5 V) from ESD and relay bounce-induced transients in modular ATE racks. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) TVS mounted directly at connector entry point, shunting fast transients before reaching precision ADC front-end. Use Value: Maintains signal integrity with sub-µA leakage at 10 V, avoiding offset drift in 16-bit measurement systems while surviving >8 kV HBM ESD. |
| Telecom Power Feeding Interface | PLC Digital I/O Module Protection |
|
Use Scenario: Safeguarding PoE-powered remote units (e.g., IP cameras) against lightning-induced surges on 48 V feed lines. IC Role / Device Role / Timing Role: Primary-level TVS on PSE-side feed line, coordinated with secondary-side MOVs and gas discharge tubes for staged clamping. Use Value: Withstands 600 W pulses without degradation, enabling UL 60950-1 and IEC 62368-1 compliance for Class 4 PoE (up to 90 W). |
Use Scenario: Protecting 24 V digital input circuits in programmable logic controllers exposed to field wiring faults and solenoid kickback. IC Role / Device Role / Timing Role: Unidirectional clamp on each discrete input channel, placed after current-limiting resistor but before optocoupler input LED. Use Value: Clamps transients to 69.4 V before optocoupler breakdown (typically 70–80 V), ensuring reliable isolation barrier integrity over 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A-M3/5B | Halogen-free molding compound; identical electrical specs and SMB package. | No difference in circuit function or layout; selected only when halogen-free compliance is mandated by OEM environmental policy. | Choose SMBJ43A-M3/5B if RoHS + halogen-free certification (e.g., IEC 61249-2-21) is contractually required. |
| SMBJ43CA-E3/5B | Bidirectional variant; symmetric VBR = 47.8–52.8 V, same VC = 69.4 V, but no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN) where voltage reversals occur; unsuitable for DC rail protection. | Use SMBJ43CA-E3/5B only when protecting bidirectional signals; SMBJ43-E3/5B remains optimal for unidirectional DC rails. |
Compared with SMBJ43A-M3/5B, SMBJ43-E3/5B offers identical surge performance with standard RoHS compliance; versus SMBJ43CA-E3/5B, it provides directional clamping essential for DC power integrity but cannot suppress negative-going transients on AC paths.
Availability
SMBJ43-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom power feeding interfaces, PLC digital I/O modules, and automated test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ43-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 optoelectronics with emphasis on reliability, power efficiency, and ruggedized packaging.
The SMBJ series was engineered for high-energy transient suppression in harsh industrial and telecom environments, delivering consistent clamping performance across temperature and lifetime with minimal derating.
FAQ
What is the maximum clamping voltage of SMBJ43-E3/5B at its rated peak pulse current?
The SMBJ43-E3/5B has a maximum clamping voltage (VC) of 69.4 V at 8.6 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ43-E3/5B maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted per recommended pad layout.
Is SMBJ43-E3/5B suitable for automotive applications?
No, SMBJ43-E3/5B is a commercial-grade part with E3 suffix and is not AEC-Q101 qualified. For automotive use, Vishay specifies the SMBJ43HE3 or SMBJ43HM3 variants, which undergo additional stress testing and lot traceability per AEC-Q101. The SMBJ43-E3/5B lacks the required qualification documentation and may not meet automotive reliability or failure rate targets, even if its electrical parameters appear sufficient.
How does the SMBJ43-E3/5B differ from the SMBJ43A-E3/5B?
There is no functional or parametric difference between SMBJ43-E3/5B and SMBJ43A-E3/5B - "A" denotes the unidirectional variant in Vishay's naming convention, and the "A" is implied in the base part number. The official Vishay datasheet lists SMBJ43A as the full designation; SMBJ43-E3/5B is a valid ordering code referencing the same device. Both share identical VWM = 43 V, VBR = 47.8–52.8 V, and VC = 69.4 V specifications.
What is the thermal resistance of SMBJ43-E3/5B, and how does it affect power derating?
The SMBJ43-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This means that at 25 °C ambient, the device can dissipate up to 5.0 W continuously; above 25 °C, power must be linearly derated by 50 mW/°C. The SMBJ43-E3/5B's RθJA directly determines safe operating area limits during repetitive surge events.
Can SMBJ43-E3/5B be used in bidirectional signal protection such as RS-485?
No - SMBJ43-E3/5B is unidirectional and will conduct heavily in reverse bias above ~1.5 V, making it unsuitable for AC or bidirectional data lines. For RS-485, CAN, or other differential signaling, the bidirectional SMBJ43CA-E3/5B must be used instead. Using SMBJ43-E3/5B on such lines would cause signal distortion, excessive DC loading, and potential latch-up in transceivers. The SMBJ43-E3/5B is strictly intended for DC rail or unidirectional signal protection.
SMBJ43-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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMBJ43-E3/5B FAQ
1.How can I place an order for SMBJ43-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43-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 SMBJ43-E3/5B reliable?
The price and inventory of SMBJ43-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 SMBJ43-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ43-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43-E3/5B?
SMBJ43-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43-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 SMBJ43-E3/5B?
For technical support, including SMBJ43-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43-E3/5B requirements.
6.How does Aetrix verify that SMBJ43-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ43-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 SMBJ43-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ43-E3/5B?
All SMBJ43-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43-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 SMBJ43-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ43-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43-E3/5B Tags
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