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Taiwan Semiconductor Corporation SMDJ43AH
- Part No.:
- SMDJ43AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ43AH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,063
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Product details
Overview
SMDJ43AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 43 V working stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), and 69.4 V maximum clamping voltage (VC) at 43.2 A peak pulse current. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and switching transient protection.
For engineers reviewing the SMDJ43AH datasheet, SMDJ43AH pinout, SMDJ43AH application, or SMDJ43AH equivalent, this device serves as a high-power, fast-response (sub-1 ps) unidirectional TVS for robust ESD and surge immunity in automotive power-line and industrial DC bus interfaces where precise clamping and thermal reliability up to 175°C junction temperature are required.
Technical Context
The SMDJ43AH employs a glass-passivated silicon junction optimized for low dynamic impedance and stable clamping under repetitive 10/1000 µs surge waveforms. Its single-die unidirectional configuration provides asymmetric conduction-low forward voltage (~3.5 V @ 100 A) and high reverse blocking-enabling use on positive-rail protection without bidirectional leakage concerns.
Thermally, it features RθJA = 75°C/W and RθJL = 15°C/W, supporting sustained operation at 6.5 W steady-state dissipation and transient handling of 3000 W for 1 ms pulses. Its moisture sensitivity level is J-STD-020 Level 1, ensuring compatibility with standard reflow processes without baking.
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 systems. |
| VBR @ IT=1 mA | 47.8–52.8 V - Measured breakdown range ensures reliable turn-on during transients while avoiding false triggering. |
| VC @ IPPM=43.2 A | 69.4 V - Clamped voltage under 10/1000 µs surge; defines worst-case overvoltage seen by downstream ICs. |
| PPK | 3000 W - Peak pulse power rating per 1 ms waveform; enables protection against severe ISO 7637-2 Pulse 5a load dump events. |
| TJ max | +175 °C - Maximum junction temperature; supports under-hood automotive placement with minimal derating. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 × 6.22 mm footprint and matte tin-plated leads for J-STD-002 solderability. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with cathode band marking; two-terminal unidirectional configuration; polarity indicated by molded cathode band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; completes clamping loop when transient exceeds VWM. |
| Cathode | High-side protected node | Connected to line being protected (e.g., battery rail); carries full surge current during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per stress test requirements. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal and humidity stress vs. epoxy-passivated alternatives. |
| ISO 7637-2 compliance | Guarantees performance against standardized automotive transients (Pulse 1, 2a, 2b, 3a, 3b), enabling drop-in integration into OEM power designs. |
| Sub-1 ps response time | Enables suppression of fast-rising ESD events before sensitive downstream circuitry experiences overstress. |
| J-STD-020 Level 1 MSL | Eliminates pre-bake requirement prior to reflow, reducing manufacturing complexity and cost in high-volume SMT lines. |
Applications
| Automotive Power Distribution | Industrial DC Power Bus |
|---|---|
Use Scenario: Protection of 36 V battery-fed ECUs (e.g., body control modules, lighting drivers) against load dump and alternator switching transients. IC Role / Device Role / Timing Role: Primary unidirectional clamping element placed between battery rail and input filter capacitor. Use Value: Limits transient overvoltage to ≤69.4 V, preventing damage to 75 V-rated DC-DC controllers and microcontrollers. | Use Scenario: Surge suppression on 48 V telecom or factory automation DC distribution rails exposed to inductive switching noise. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across rail-to-ground to shunt energy from relay coil flyback or motor commutation spikes. Use Value: Handles 3000 W surges without degradation, maintaining system uptime in harsh electromagnetic environments. |
| Consumer Equipment AC/DC Input Stage | Renewable Energy Charge Controller Interface |
Use Scenario: Secondary-level protection after MOVs in 24–48 V wall adapters and PoE-powered devices subjected to conducted ESD. IC Role / Device Role / Timing Role: Fast-reacting TVS placed downstream of bulk filtering to catch residual fast transients missed by slower primary protectors. Use Value: Sub-1 ps response captures nanosecond-scale ESD events, safeguarding USB-PD and Ethernet PHY ICs. | Use Scenario: Protection of solar charge controller inputs connected to battery banks subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Unidirectional rail clamp on battery-side input, rated for repeated 10/1000 µs surges per IEC 61000-4-5. Use Value: Withstands ≥1000 surges at rated PPK, extending service life in off-grid installations with limited maintenance access. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC43 | Lower PPK (1500 W), higher VC (72.0 V @ 21.6 A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 5a; limited to lower-energy transients like ESD and minor load switching | Select only if system surge energy is confirmed ≤1500 W and clamping margin allows 72.0 V. |
| SMCJ43A | Identical electrical specs and DO-214AB package; manufactured by Vishay; AEC-Q101 qualified but not ISO 7637-2 tested per datasheet | Lacks documented ISO 7637-2 compliance; requires additional validation for automotive OEM use | Acceptable for industrial or consumer use where ISO 7637-2 is not mandated; verify test reports for target application. |
Compared with SAC43 and SMCJ43A, the SMDJ43AH delivers verified 3000 W surge capability and explicit ISO 7637-2 certification-making it the preferred choice for automotive front-end protection where regulatory compliance and worst-case transient margin are non-negotiable.
Availability
SMDJ43AH is available at Aetrix Electronics and suitable for automotive electronics, industrial power systems, and renewable energy interface designs requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMDJ43AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The SMDJ series was developed specifically for high-reliability transient suppression in automotive power networks, emphasizing AEC-Q101 robustness, ISO 7637-2 compliance, and thermal resilience in compact SMC packages.
FAQ
What is the maximum clamping voltage of the SMDJ43AH under a standard 10/1000 µs surge?
The SMDJ43AH has a maximum clamping voltage (VC) of 69.4 V when subjected to a 10/1000 µs surge waveform at its rated peak pulse current of 43.2 A. This value is measured per JEDEC standards and guarantees that downstream components see no more than 69.4 V during worst-case transient events, making it suitable for protecting 75 V-rated power management ICs in automotive applications.
Is the SMDJ43AH suitable for bidirectional transient protection?
No, the SMDJ43AH is a unidirectional TVS diode and is not rated for bidirectional operation. For bidirectional protection at 43 V standoff, the designated part is SMDJ43CAH (with CAH suffix). Using SMDJ43AH in reverse-biased configurations may result in premature failure due to lack of symmetric breakdown characteristics.
Does the SMDJ43AH require special handling or baking before reflow soldering?
No, the SMDJ43AH has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into standard lead-free reflow profiles without pre-baking. Its matte tin-plated leads also comply with J-STD-002 for reliable solder wetting.
How does the SMDJ43AH compare to the SMDJ40AH in terms of voltage ratings and application fit?
The SMDJ43AH has a 43 V working stand-off voltage (VWM) versus 40 V for the SMDJ40AH, with corresponding VBR ranges of 47.8–52.8 V and 44.4–49.1 V. This 3 V higher VWM makes SMDJ43AH better suited for 36 V nominal systems where tighter margin above operating voltage is needed, while SMDJ40AH fits 32–36 V systems with slightly lower clamping overhead.
What automotive transient standards does the SMDJ43AH meet, and how is compliance verified?
The SMDJ43AH meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements as stated in Taiwan Semiconductor's official datasheet revision B2104. Compliance is verified through third-party lab testing per the standard's waveform definitions and pass/fail criteria-including voltage overshoot limits, recovery behavior, and repeatability across multiple pulses-ensuring suitability for Tier-1 automotive subsystems.
SMDJ43AH 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ43AH FAQ
1.How can I place an order for SMDJ43AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ43AH 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 SMDJ43AH reliable?
The price and inventory of SMDJ43AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ43AH is usually 5 days.
3.What payment methods are accepted for SMDJ43AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ43AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ43AH?
SMDJ43AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ43AH 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 SMDJ43AH?
For technical support, including SMDJ43AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ43AH requirements.
6.How does Aetrix verify that SMDJ43AH is sourced from the original manufacturer or authorized distributors?
All SMDJ43AH 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 SMDJ43AH meets industry standards.
7.What is the process for return or replacement of SMDJ43AH?
All SMDJ43AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ43AH, 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 SMDJ43AH part is unused and in its original packaging.
Return procedure for SMDJ43AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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