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Taiwan Semiconductor Corporation SMBJ43A
- Part No.:
- SMBJ43A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:33,172
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Product details
Overview
SMBJ43A from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 43V working stand-off voltage (VWM), 47.8–52.8V breakdown voltage (VBR), and 69.4V maximum clamping voltage (VC) at 9.0A peak impulse current - designed for automotive load-dump and ESD protection in power supply rails and I/O interfaces.
For engineers reviewing the SMBJ43A datasheet, SMBJ43A pinout, SMBJ43A application, or SMBJ43A equivalent, key selection criteria include clamping performance under 10/1000µs surge, unidirectional polarity marking, JEDEC-compliant thermal resistance (RθJA = 55°C/W), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics robustness.
Technical Context
The SMBJ43A employs a glass-passivated silicon junction optimized for fast transient suppression with sub-1ps response time and low leakage (<1µA at VWM). Its unidirectional configuration provides forward conduction capability up to 100A IFSM and 3.5V VF (per SMBJ series spec for ≤90V variants).
Thermally, it features RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable operation up to TJ = +150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - suitable for lead-free reflow without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR @ IT=1mA | 47.8–52.8 V - Breakdown threshold range; ensures consistent turn-on across production lots. |
| VC @ IPP=9.0A | 69.4 V - Clamped voltage during 10/1000µs surge; limits downstream IC stress to <70V. |
| PPK | 600 W - Peak pulse power rating; supports single-event transients per ISO 7637-2. |
| ID @ VWM | <1 µA - Ultra-low leakage at rated stand-off; preserves battery life in always-on systems. |
| TJ max | +150 °C - Maximum junction temperature; enables under-hood automotive deployment. |
| RθJA | 55 °C/W - Thermal resistance to ambient; informs PCB copper area requirements for thermal management. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, UL 94V-0 molding compound, 0.090g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to protected circuit ground or low-side reference; completes clamping loop during positive transients. |
| Cathode | Reverse-biased terminal / Clamping node | Connected to protected line (e.g., 12V rail); conducts when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and long-term reliability in humid environments. |
| Sub-1ps response time | Clamps ESD events before sensitive logic or analog circuits experience overstress. |
| ISO 7637-2 compliance | Validated for automotive Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise). |
| J-STD-020 Level 1 MSL | Zero floor-life limitation; can be mounted directly from dry pack without baking. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for eco-conscious manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load-dump transients up to 35V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary clamping device on main power input, placed upstream of DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤69.4V during 600W surges, preventing latch-up or gate oxide damage in downstream PMICs and MCUs. |
Use Scenario: 4–20mA current-loop sensors in factory automation subject to EFT bursts and cable coupling. IC Role / Device Role / Timing Role: Bidirectional protection (when paired with SMBJ43CA) or unidirectional rail clamp on sensor supply line. Use Value: Maintains signal integrity by suppressing >1kV EFT pulses while adding <1pF junction capacitance - no bandwidth degradation. |
| LED Driver Overvoltage Clamp | USB Port ESD Suppression |
Use Scenario: Constant-current LED drivers in outdoor signage subjected to lightning-induced surges on 24V bus lines. IC Role / Device Role / Timing Role: Standoff-rated TVS on driver input, triggered only during abnormal overvoltage events. Use Value: Withstands repeated 10/1000µs transients up to 600W without degradation, extending driver lifetime beyond 100,000 cycles. |
Use Scenario: USB 2.0 data lines (D+/D−) and VBUS in industrial docking stations exposed to ±8kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Secondary-level protection after common-mode chokes; placed near connector. Use Value: Sub-1ps response captures ESD before transceiver ICs react; clamping voltage remains below 12V for VBUS, preserving USB PHY tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ43A | Same DO-214AC (SMA) package; 600W PPK but higher RθJA (65°C/W); VC = 70.1V @ 9.0A. | Slightly lower thermal efficiency; requires larger copper pour for same power derating. | Prefer SMBJ43A for space-constrained layouts where SMB footprint saves board area vs SMA. |
| Vishay 1.5SMC43A | DO-214AB (SMC) package; 1500W PPK; VC = 69.7V @ 21.5A; higher IFSM (200A). | Over-specified for 600W use cases; larger footprint and cost premium. | Choose SMBJ43A when 600W rating matches system surge profile and SMB size is required for density. |
Compared with SMAJ43A and 1.5SMC43A, the SMBJ43A delivers identical clamping performance in a smaller DO-214AA footprint, better thermal resistance than SMAJ43A, and tighter VBR tolerance than 1.5SMC43A - making it optimal for automotive body control modules and compact industrial I/O protectors.
Availability
SMBJ43A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED lighting drivers, and USB peripheral protection requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMBJ43A 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 certification for automotive-grade products.
The SMBJ series was engineered specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems and industrial equipment - emphasizing low clamping voltage, repeatable surge endurance, and robust packaging for automated SMT assembly.
FAQ
What is the maximum clamping voltage of SMBJ43A under standard test conditions?
The SMBJ43A has a maximum clamping voltage (VC) of 69.4 V when subjected to a 10/1000 µs surge waveform at 9.0 A peak impulse current (IPP), measured per ANSI/IEEE C62.35. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits during transient events.
Is SMBJ43A suitable for bidirectional transient protection?
No - SMBJ43A is a unidirectional TVS diode, intended for DC or polarity-defined circuits. For bidirectional protection, Taiwan Semiconductor specifies the SMBJ43CA variant (with "C" or "CA" suffix), which provides symmetrical clamping in both polarities and shares the same VWM, VBR, and VC ratings.
Does SMBJ43A meet automotive qualification standards?
Yes - the SMBJ43A is designed and tested to meet ISO 7637-2 (Pulse 1/2a/2b/3a/3b) for automotive electrical disturbances and complies with JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - foundational requirements for AEC-Q101 qualification, though final AEC-Q101 certification must be confirmed per batch documentation.
What is the forward voltage drop of SMBJ43A at rated surge current?
The SMBJ43A exhibits a forward voltage (VF) of 3.5 V at 50 A forward surge current (IFSM), consistent with all SMBJ-series devices rated ≤90 V. This low VF minimizes power loss during unidirectional fault conduction and supports compatibility with standard 12V/24V system grounding schemes.
How does SMBJ43A compare to SMBJ43 in terms of breakdown voltage tolerance?
The SMBJ43A has a tighter VBR tolerance: 47.8–52.8 V (min/max) versus SMBJ43's 47.8–58.4 V. This narrower 5.0 V span improves design margin predictability in precision clamping applications, reducing risk of premature triggering or insufficient protection in critical power rails.
SMBJ43A 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:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- 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)
SMBJ43A FAQ
1.How can I place an order for SMBJ43A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43A 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 SMBJ43A reliable?
The price and inventory of SMBJ43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43A is usually 5 days.
3.What payment methods are accepted for SMBJ43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43A?
SMBJ43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43A 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 SMBJ43A?
For technical support, including SMBJ43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43A requirements.
6.How does Aetrix verify that SMBJ43A is sourced from the original manufacturer or authorized distributors?
All SMBJ43A 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 SMBJ43A meets industry standards.
7.What is the process for return or replacement of SMBJ43A?
All SMBJ43A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43A, 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 SMBJ43A part is unused and in its original packaging.
Return procedure for SMBJ43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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