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Taiwan Semiconductor Corporation SMDJ43A
- Part No.:
- SMDJ43A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ43A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,333
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Product details
Overview
SMDJ43A from Taiwan Semiconductor is a unidirectional 43V stand-off surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000W peak pulse power, 69.4V maximum clamping voltage at 43.2A peak current, and -55°C to +175°C operating junction temperature. It protects telecom and industrial power rails against ESD, lightning-induced surges, and load-switch transients.
For engineers reviewing the SMDJ43A datasheet, SMDJ43A pinout, SMDJ43A application, or SMDJ43A equivalent, key selection criteria include verified 47.8–52.8V breakdown range, 1µA max reverse leakage at 43V, 6.5W steady-state dissipation, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive-grade surge immunity.
Technical Context
The SMDJ43A employs a glass-passivated silicon junction optimized for fast transient response (<1.0ps), with unidirectional polarity indicated by cathode band marking. Its thermal design features 15°C/W junction-to-lead resistance and 75°C/W junction-to-ambient resistance, enabling reliable operation under high-energy 10/1000µs waveform surges.
Designed for automated SMT placement, it meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance. The DO-214AB (SMC) package supports 300A non-repetitive forward surge current and maintains 3.5V forward voltage at 100A per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 47.8 V / 52.8 V - Verified breakdown threshold at 1 mA test current, defining turn-on precision |
| VC @ IPPM | 69.4 V - Clamped voltage at 43.2 A peak pulse current, limiting downstream stress |
| PPK | 3000 W - Peak pulse power handling per 10/1000 µs waveform, critical for lightning immunity |
| TJ max | +175 °C - Maximum junction temperature, supporting high-ambient industrial deployments |
| IR @ VWM | 1 µA - Reverse leakage at rated stand-off voltage, ensuring minimal standby power loss |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance, enabling effective PCB copper pour heat sinking |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line; conducts during reverse-biased transient events |
| Cathode | Ground/Return side | Connected to system ground; defines unidirectional clamping direction via marked band |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable breakdown voltage and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance | Validated immunity to automotive electrical transients (Pulse 1/2a/2b/3a/3b) |
| Fast response time | <1.0 ps typical response ensures clamping before sensitive ICs experience overvoltage |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, simplifying manufacturing flow |
| UL 94V-0 molding compound | Meets flammability safety standard for enclosed industrial and telecom enclosures |
Applications
| Telecom Power Input Protection | Industrial PLC I/O Module Protection |
|---|---|
Use Scenario: Protecting 48V DC power inputs in base station remote radio units against induced lightning surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input rail and chassis ground to clamp transients before DC-DC converter stage. Use Value: 69.4V clamping voltage limits downstream voltage stress below 70V, preserving 75V-rated input capacitors and MOSFETs. | Use Scenario: Safeguarding analog input channels of programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Primary surge suppression device on signal lines entering isolation barrier, shunting energy to local ground. Use Value: 3000W peak power rating absorbs multi-kA-level surges from inductive load switching without degradation. |
| Automotive Body Control Module (BCM) | Consumer Set-Top Box Power Supply |
Use Scenario: Suppressing load-dump and jump-start transients on 12V battery-fed subsystems in BCMs. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between battery rail and ground, activated only during >43V overvoltage events. Use Value: 43V working voltage matches nominal 12V system derating margin while maintaining low leakage (1 µA) during normal operation. | Use Scenario: Securing 12V adapter input of digital video recorders against ESD and AC-line coupled noise. IC Role / Device Role / Timing Role: First-line protection device mounted at board edge, diverting fast ESD pulses before upstream regulators. Use Value: Sub-1ps response time ensures clamping occurs within first nanosecond of contact discharge, preventing latch-up in PMICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC43 | Lower PPK (1500W), higher VC (72.0V), same VWM (43V), DO-214AB package | Less robust for ISO 7637-2 Pulse 5a (load dump); suitable for lower-energy consumer applications | Select SAC43 only when 3000W surge headroom is not required and cost optimization is prioritized |
| 1.5SMC43A | Same VWM (43V), identical DO-214AB package, but lower PPK (1500W) and higher VC (70.1V) | Not rated for ISO 7637-2; limited to basic ESD and low-energy switching transients | Choose 1.5SMC43A for non-automotive designs where full 3000W capability is unnecessary |
Compared with SAC43 and 1.5SMC43A, the SMDJ43A delivers 100% higher peak power rating and tighter clamping (69.4V vs ≥70.1V), making it the only option qualified for demanding automotive and industrial surge standards without derating.
Availability
SMDJ43A is available at Aetrix Electronics and suitable for telecom power input protection, industrial PLC I/O modules, automotive body control units, and consumer set-top box power supplies requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMDJ43A 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 and automotive markets.
The SMDJ series was engineered specifically for high-energy transient suppression in harsh environments, targeting applications requiring 3000W pulse handling, wide temperature operation, and international surge immunity standards.
FAQ
What is the breakdown voltage range of the SMDJ43A?
The SMDJ43A has a guaranteed breakdown voltage range of 47.8 V to 52.8 V at 1 mA test current, as specified in the Electrical Specifications table. This range ensures consistent clamping behavior across production lots and supports reliable overvoltage protection design margins for 43 V nominal systems.
Does the SMDJ43A meet automotive surge immunity standards?
Yes, the SMDJ43A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, making it suitable for automotive body electronics and infotainment power rails. Its 3000W peak power rating and 69.4V clamping voltage are validated for these standardized transient waveforms.
What is the maximum clamping voltage of the SMDJ43A under surge conditions?
The SMDJ43A exhibits a maximum clamping voltage of 69.4 V at 43.2 A peak pulse current (IPPM), measured using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Is the SMDJ43A unidirectional or bidirectional?
The SMDJ43A is a unidirectional TVS diode, indicated by its part number suffix "A" and cathode band marking. It conducts only during reverse-biased overvoltage events and maintains low leakage (<1 µA) under normal forward bias conditions.
What package type does the SMDJ43A use, and what are its key mechanical properties?
The SMDJ43A uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability. It weighs approximately 0.290 g, carries UL 94V-0 flammability rating, and features polarity marking via cathode band for unidirectional orientation.
SMDJ43A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 43.2A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ43A FAQ
1.How can I place an order for SMDJ43A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ43A 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 SMDJ43A reliable?
The price and inventory of SMDJ43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ43A is usually 5 days.
3.What payment methods are accepted for SMDJ43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ43A?
SMDJ43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ43A 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 SMDJ43A?
For technical support, including SMDJ43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ43A requirements.
6.How does Aetrix verify that SMDJ43A is sourced from the original manufacturer or authorized distributors?
All SMDJ43A 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 SMDJ43A meets industry standards.
7.What is the process for return or replacement of SMDJ43A?
All SMDJ43A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ43A, 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 SMDJ43A part is unused and in its original packaging.
Return procedure for SMDJ43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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