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Taiwan Semiconductor Corporation SMBJ43
- Part No.:
- SMBJ43
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43.pdf
- Description:
- 600W, 53.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,134
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Product details
Overview
SMBJ43 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in DC power lines and signal interfaces. It features a 43 V working stand-off voltage (VWM), 47.8–58.4 V breakdown voltage (VBR @ 1 mA), 76.7 V maximum clamping voltage (VC) at 8.2 A peak pulse current (IPP), and 600 W peak pulse power rating with <1.0 ps response time.
For engineers reviewing the SMBJ43 datasheet, SMBJ43 pinout, SMBJ43 application, or SMBJ43 equivalent, this device is selected for automotive load-dump immunity, industrial I/O port ESD hardening, and DC power rail overvoltage suppression where fast clamping, low leakage (<1 µA @ 43 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The SMBJ43 uses a glass-passivated silicon junction optimized for unidirectional transient suppression. Its clamping behavior follows the 10/1000 µs standard waveform, delivering consistent VC ≤ 76.7 V at IPP = 8.2 A while maintaining TJ ≤ 150 °C under rated conditions.
Thermal performance is defined by RθJA = 55 °C/W and RθJC = 10 °C/W, enabling reliable operation in ambient temperatures from –55 °C to +150 °C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC bias margin. |
| VBR min/max | 47.8–58.4 V @ 1 mA - Verified breakdown range ensures robust turn-on threshold across production lots. |
| VC @ IPP | 76.7 V @ 8.2 A - Clamping voltage during 10/1000 µs surge; determines protected circuit's maximum transient stress. |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs event; supports ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance. |
| ID @ VWM | <1 µA - Ultra-low reverse leakage at rated stand-off voltage; minimizes standby power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial environments. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.090 g. Meets UL 94V-0 flammability rating and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events (IFSM = 100 A). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 43 V rail); initiates avalanche breakdown when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream ICs experience damaging overvoltage-critical for CAN, LIN, and sensor interfaces. |
| ISO 7637-2 compliance | Validated for automotive electrical system immunity (Pulse 1/2a/2b/3a/3b), supporting AEC-Q101 prequalification context. |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking; reduces manufacturing overhead and moisture-related delamination risk. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for green electronics manufacturing and export markets. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V/24 V vehicle battery feed lines exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges up to ±100 V. Use Value: Limits transient voltage to ≤76.7 V, protecting MCU power supplies and CAN transceivers per ISO 7637-2 Pulse 5a. |
Use Scenario: 4–20 mA analog sensor loop inputs in PLC modules subjected to EFT bursts. IC Role / Device Role / Timing Role: Standoff protection on input terminals, absorbing 5 kV ESD and 1 kV EFT pulses. Use Value: Sub-µA leakage preserves loop accuracy; fast clamping prevents ADC saturation and microcontroller reset. |
| DC Motor Drive Control | LED Driver Power Input |
Use Scenario: H-bridge gate driver supply rails experiencing inductive kickback during PWM switching. IC Role / Device Role / Timing Role: TVS connected across VDD and GND to absorb flyback energy from motor windings. Use Value: 600 W peak power rating handles repetitive 10/1000 µs spikes without degradation; TJ ≤ 150 °C ensures thermal stability. |
Use Scenario: Constant-current LED driver input stage exposed to lightning-induced surges on AC/DC adapter outputs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC bus before buck converter input capacitors. Use Value: 43 V VWM matches typical 48 V nominal LED system rails; clamping at 76.7 V prevents MOSFET avalanche failure. |
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 | Lower VBR range (47.8–52.8 V vs. 47.8–58.4 V); tighter breakdown tolerance; same VWM, VC, and PPK. | Better suited for precision-clamp designs requiring minimal VBR spread; identical footprint and mounting. | Select SMBJ43A when tighter VBR consistency is needed for predictable clamping onset; otherwise SMBJ43 offers broader process margin. |
| SMAJ43 | Same VWM/VBR/VC specs but lower PPK (400 W vs. 600 W); DO-214AC (SMA) package with smaller thermal mass. | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or high-IPP industrial surges. | Choose SMAJ43 only for space-constrained, low-power applications where 400 W peak power suffices and thermal derating is acceptable. |
Compared with SMBJ43A and SMAJ43, the SMBJ43 delivers the broadest VBR tolerance and highest surge energy handling in its package class-making it optimal for cost-sensitive, high-reliability automotive and industrial power rail protection where design margin and test compliance are critical.
Availability
SMBJ43 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and DC motor drive control requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMBJ43 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial, automotive, and consumer applications.
The SMBJ series was developed to deliver high-power, surface-mount transient suppression with automotive-grade reliability, targeting ISO 7637-2 compliance and AEC-Q101 readiness in compact DO-214AA packaging.
FAQ
What is the maximum clamping voltage of SMBJ43 under standard 10/1000 µs surge conditions?
The SMBJ43 has a maximum clamping voltage (VC) of 76.7 V when subjected to an 8.2 A peak impulse current (IPP) using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Taiwan Semiconductor's R2104 datasheet revision, ensuring predictable overvoltage limiting for downstream components.
Is SMBJ43 suitable for bidirectional transient protection?
No, SMBJ43 is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications, the SMBJ43C or SMBJ43CA variants must be used-these incorporate symmetrical breakdown characteristics in both directions and are explicitly designated in the ordering code and datasheet.
What is the leakage current specification for SMBJ43 at its rated working voltage?
The SMBJ43 exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its 43 V working stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage preserves efficiency in always-on systems such as automotive body controllers and battery-backed IoT sensors.
Does SMBJ43 meet automotive EMC standards?
Yes, SMBJ43 meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as verified in Taiwan Semiconductor's characterization data. It is commonly deployed in AEC-Q101-qualified designs for powertrain and chassis modules.
What is the thermal resistance from junction to ambient for SMBJ43 in standard PCB layout?
The SMBJ43 has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). Actual board-level RθJA will vary with copper area, layer count, and airflow-but this baseline enables accurate TJ estimation during surge events using the derating curve in Figure 2 of the datasheet.
SMBJ43 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 8.2A
- 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 (SMB)
SMBJ43 FAQ
1.How can I place an order for SMBJ43 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43 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 reliable?
The price and inventory of SMBJ43 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43 is usually 5 days.
3.What payment methods are accepted for SMBJ43?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43?
SMBJ43 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43 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?
For technical support, including SMBJ43 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43 requirements.
6.How does Aetrix verify that SMBJ43 is sourced from the original manufacturer or authorized distributors?
All SMBJ43 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 meets industry standards.
7.What is the process for return or replacement of SMBJ43?
All SMBJ43 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43, 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 part is unused and in its original packaging.
Return procedure for SMBJ43:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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