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Taiwan Semiconductor Corporation SMBJ43H
- Part No.:
- SMBJ43H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43H.pdf
- Description:
- 600W, 53.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,580
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Product details
Overview
SMBJ43H 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 automotive and industrial power rails. It features a 43 V working stand-off voltage (VWM), 47.8–58.4 V breakdown voltage (VBR), 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 SMBJ43H datasheet, SMBJ43H pinout, SMBJ43H application, or SMBJ43H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, junction-to-ambient thermal resistance (55 °C/W), and unidirectional polarity marking for correct PCB orientation in 12 V/24 V automotive subsystems.
Technical Context
The SMBJ43H operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (47.8–58.4 V @ 1 mA), then clamping transients to ≤76.7 V at 8.2 A (10/1000 µs waveform). Its glass-passivated junction ensures stable leakage (<1 µA @ 43 V) and robust ESD immunity.
Thermally, it sustains 150 °C max junction temperature with RθJC = 10 °C/W and RθJA = 55 °C/W, enabling reliable operation in enclosed automotive ECUs without forced airflow. Polarity is marked by cathode band per DO-214AA mechanical drawing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 36 V nominal automotive rail. |
| VBR min/max | 47.8 / 58.4 V @ 1 mA - Confirmed breakdown threshold range; ensures consistent turn-on across production lot and temperature. |
| VC @ IPP | 76.7 V @ 8.2 A (10/1000 µs) - Clamping voltage defines worst-case voltage seen by protected IC during surge; critical for 75 V-rated downstream components. |
| PPK | 600 W - Peak pulse power handling capacity; supports ISO 7637-2 Pulse 5a (load dump) energy absorption without failure. |
| IR @ VWM | <1 µA @ 43 V - Ultra-low leakage preserves battery drain budget in always-on vehicle modules (e.g., CAN wake-up circuits). |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 0.090 g mass; compatible with automated pick-and-place and reflow profiles per J-STD-020 Level 1. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, UL 94V-0 rated compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path; conducts during forward surge events (e.g., reverse-battery protection). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., LIN bus, sensor supply); avalanches into conduction when voltage exceeds VBR to shunt surge current. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling (-55 °C to +150 °C), mechanical shock, and humidity testing. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) immunity requirements. |
| Glass passivated junction | Ensures stable VBR tolerance and low IR drift over lifetime; eliminates risk of metallization corrosion in humid environments. |
| Fast response time | <1.0 ps - Enables protection of high-speed interfaces (e.g., CAN FD, LIN) before transient energy couples into sensitive analog front-ends. |
Applications
| Automotive Power Rail Protection | LIN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V battery-fed control modules (e.g., body control units) from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp positive transients above 43 V. Use Value: Limits voltage to ≤76.7 V during 600 W surges, preventing damage to 75 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding LIN transceivers against ESD and coupled noise from adjacent high-current wiring. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMBJ43H used in unidirectional configuration on LIN supply line only. Use Value: Sub-µA leakage avoids disrupting LIN bus biasing; fast clamping prevents false dominant/recessive state errors during EFT bursts. |
| Industrial Sensor Interface Protection | LED Driver Input Surge Suppression |
Use Scenario: Shielding 4–20 mA loop-powered sensors from induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Placed across sensor's V+ and GND terminals to absorb common-mode transients entering via long field cables. Use Value: 600 W rating handles multi-kV lightning-induced surges; DO-214AA footprint allows compact placement near connector entry point. |
Use Scenario: Preventing overvoltage failure in constant-current LED drivers subjected to AC line switching transients. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-input capacitor to clamp positive spikes before they reach driver IC input stage. Use Value: 76.7 V clamping voltage protects 80 V-rated MOSFETs and bootstrap capacitors; AEC-Q101 grade supports extended outdoor lighting reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | Lower VBR range (47.8–52.8 V) and higher IPP (9.0 A), resulting in lower VC (69.4 V) at same test condition. | Better clamping performance for systems with tighter voltage margins (e.g., 60 V-rated regulators), but slightly reduced surge energy headroom. | Select SMBJ43A when clamping voltage is critical and system can tolerate narrower VBR tolerance. |
| SAC43 | Same VWM (43 V) and package (DO-214AA), but lower PPK (400 W) and higher VC (87.1 V @ 5.5 A). | Suitable for less severe surge environments (e.g., consumer-grade lighting), not recommended for ISO 7637-2 Pulse 5a compliance. | Choose SAC43 only for cost-sensitive non-automotive designs where 600 W rating is unnecessary. |
Compared with SMBJ43H, SMBJ43A offers superior clamping (69.4 V vs. 76.7 V) at the expense of tighter VBR tolerance, while SAC43 trades peak power capability for lower cost-making SMBJ43H the balanced choice for AEC-Q101-compliant 12 V/24 V automotive power rails.
Availability
SMBJ43H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and LED driver input protection requiring stable component supply and full AEC-Q101 qualification.
Supply support for SMBJ43H 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, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing low leakage, precise VBR control, and robust ISO 7637-2 immunity.
FAQ
What is the maximum clamping voltage of SMBJ43H under standard test conditions?
The SMBJ43H has a maximum clamping voltage (VC) of 76.7 V when subjected to an 8.2 A peak pulse current with a 10/1000 µs waveform at TA = 25°C. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ43H maintains this clamping performance across its specified operating temperature range.
Is SMBJ43H suitable for bidirectional transient protection?
No, SMBJ43H is a unidirectional TVS diode intended for protection against positive-going transients only. Its cathode band marking indicates polarity, and it does not conduct in reverse breakdown. For bidirectional protection, the SMBJ43CH or SMBJ43AH variants must be used-these are explicitly designed with symmetrical breakdown characteristics in both directions.
Does SMBJ43H meet automotive qualification standards?
Yes, SMBJ43H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. It is rated for operation from -55 °C to +150 °C junction temperature and complies with J-STD-020 moisture sensitivity level 1, making it suitable for under-hood automotive applications including engine control units and body electronics.
What is the leakage current specification for SMBJ43H at its working voltage?
The SMBJ43H exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its 43 V working stand-off voltage (VWM) and tested at TA = 25°C. This ultra-low leakage ensures minimal impact on battery-powered systems and supports long-term reliability in always-on automotive modules such as CAN wake-up receivers.
How does the thermal performance of SMBJ43H affect PCB layout decisions?
With a junction-to-ambient thermal resistance (RθJA) of 55 °C/W, SMBJ43H requires adequate copper pour area on the PCB to dissipate heat during repetitive surge events. Layout best practices include connecting both terminals to ≥1 cm² internal or external copper planes and avoiding narrow traces that increase thermal impedance. The DO-214AA package's RθJC of 10 °C/W further emphasizes the need for direct thermal paths to ground or power planes.
SMBJ43H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ43H FAQ
1.How can I place an order for SMBJ43H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43H 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 SMBJ43H reliable?
The price and inventory of SMBJ43H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43H is usually 5 days.
3.What payment methods are accepted for SMBJ43H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43H?
SMBJ43H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43H 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 SMBJ43H?
For technical support, including SMBJ43H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43H requirements.
6.How does Aetrix verify that SMBJ43H is sourced from the original manufacturer or authorized distributors?
All SMBJ43H 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 SMBJ43H meets industry standards.
7.What is the process for return or replacement of SMBJ43H?
All SMBJ43H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43H, 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 SMBJ43H part is unused and in its original packaging.
Return procedure for SMBJ43H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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