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Taiwan Semiconductor Corporation SMCJ43AH
- Part No.:
- SMCJ43AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43AH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,072
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Product details
Overview
SMCJ43AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 43V working stand-off voltage (VWM), 47.8–52.8V breakdown voltage (VBR), and 69.4V maximum clamping voltage (VC) at 22A peak pulse current - designed for automotive-grade ESD and surge protection in power supply rails and I/O lines.
For engineers reviewing the SMCJ43AH datasheet, SMCJ43AH pinout, SMCJ43AH application, or SMCJ43AH equivalent, this device delivers AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and robust thermal performance (RθJA = 55°C/W) for high-reliability industrial and automotive electronics.
Technical Context
The SMCJ43AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (47.8–52.8V at 1mA test current). It clamps transients to ≤69.4V at 22A (10/1000µs waveform), dissipating up to 1500W peak power for 1ms pulses while maintaining junction temperature within -55°C to +150°C limits.
Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1µA at VWM = 43V), and it meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - enabling reliable reflow soldering and long-term field operation in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 47.8 V / 52.8 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance |
| VC @ IPPM | 69.4 V at 22 A - Clamped voltage during 10/1000µs surge, directly limiting downstream IC stress |
| PPK | 1500 W - Peak pulse power handling capability for transient suppression per IEC 61000-4-5 |
| IR @ VWM | <1 µA - Minimal leakage current ensures negligible standby power loss and signal integrity |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial power-conversion environments |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient, guiding PCB copper pour and heatsinking needs |
Pinout & Package
DO-214AB (SMC) surface-mount package: cathode-banded single-ended configuration with two terminals - anode (unmarked end) and cathode (banded end). Matte tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 48V rail or CAN bus); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| ISO 7637-2 compliant | Withstands load-dump (Pulse 5a/b), jump-start (Pulse 4), and switching transients (Pulses 1/2a/2b/3a/3b) |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| Fast response time <1 ps | Clamps ESD events before sensitive logic or analog circuitry sustains damage |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input |
|---|---|
Use Scenario: Protecting 48V battery-supplied ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input. Use Value: Clamps 120V/100ms load dump surges to ≤69.4V, preventing MOSFET gate oxide rupture and regulator latch-up. | Use Scenario: Safeguarding programmable logic controller (PLC) 24V DC inputs from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary surge clamp on DIN-rail power feed before filtering and regulation stages. Use Value: Absorbs 1500W transients per IEC 61000-4-5 Level 4 without degradation, ensuring >10-year field reliability. |
| Telecom Line Interface | Motor Drive Control Signal |
Use Scenario: Shielding RS-485 transceivers on base station backhaul links from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired unidirectional TVS on each differential line referenced to local ground. Use Value: Limits clamping voltage to 69.4V while maintaining <1µA leakage, preserving signal integrity up to 20 Mbps. | Use Scenario: Protecting isolated gate drivers in servo motor inverters from shoot-through-inducing voltage spikes. IC Role / Device Role / Timing Role: TVS mounted across gate resistor to suppress Miller-induced dv/dt spikes on high-side FET gates. Use Value: Responds in <1ps to clamp 100V nanosecond spikes, preventing false turn-on and destructive short-circuit currents. |
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 | 600W rating, SMB package (smaller footprint, higher RθJA = 85°C/W), same VWM/VBR/VC specs | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a (load dump) | Select when board space is constrained and peak surge energy ≤600W |
| 1.5KE43A | Through-hole DO-201 package, 1500W rating, identical electrical specs but no AEC-Q101 or ISO 7637-2 validation | Not qualified for automotive use; requires manual assembly and lacks moisture sensitivity level certification | Select for cost-sensitive industrial power supplies where automated SMT is not required |
Compared with SMBJ43A and 1.5KE43A, the SMCJ43AH provides superior thermal dissipation (RθJA = 55°C/W vs. 85°C/W), AEC-Q101 qualification, and full ISO 7637-2 compliance - making it the only choice for automotive front-end protection where reliability under repeated surge stress is mandatory.
Availability
SMCJ43AH is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC power input protection, and telecom line interface hardening requiring stable component supply, consistent parametric performance, and full traceability.
Supply support for SMCJ43AH 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, specializing in TVS diodes, rectifiers, and power devices since 1979.
The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial systems, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and robust SMT manufacturability in DO-214AB packaging.
FAQ
What is the clamping voltage of the SMCJ43AH under standard 10/1000µs surge conditions?
The SMCJ43AH has a maximum clamping voltage (VC) of 69.4 V when subjected to a 22 A peak pulse current with a 10/1000µs waveform. This value is measured per IEC 61000-4-5 and ensures downstream components see limited overvoltage stress during real-world transients such as load dump or inductive switching events. The SMCJ43AH maintains this clamping performance across its rated junction temperature range (-55°C to +150°C).
Is the SMCJ43AH suitable for bidirectional transient protection?
No - the SMCJ43AH is a unidirectional TVS diode, intended for protection of DC power rails or single-polarity signal lines. For bidirectional applications (e.g., AC lines or differential buses like RS-485), Taiwan Semiconductor offers the SMCJ43CAH variant, which features symmetrical breakdown in both directions. Using SMCJ43AH in reverse-biased configurations beyond its specified VWM may cause permanent damage.
Does the SMCJ43AH meet automotive qualification standards?
Yes - the SMCJ43AH is AEC-Q101 qualified and explicitly validated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity testing. Its construction includes glass passivation, JESD201 Class 2 whisker resistance, and J-STD-020 Level 1 moisture sensitivity - all required for under-hood and chassis-mounted automotive electronics. The SMCJ43AH datasheet confirms these qualifications in Version A2102.
What is the reverse leakage current specification for the SMCJ43AH at its working voltage?
The SMCJ43AH exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its working stand-off voltage (VWM = 43 V) and tested at TA = 25°C. This ultra-low leakage ensures minimal power loss in always-on systems and preserves signal integrity in high-impedance sensing or communication circuits. Leakage remains well below 1 µA across the full operating temperature range.
How does the SMCJ43AH compare to the SMCJ43H in terms of breakdown voltage tolerance?
The SMCJ43AH has a tighter breakdown voltage (VBR) tolerance than the SMCJ43H: SMCJ43AH specifies VBR between 47.8 V and 52.8 V (±5.2% around nominal 50.3 V), whereas SMCJ43H spans 47.8 V to 58.4 V (±11.1%). This narrower window improves consistency in clamping onset across production batches - critical for designs where precise overvoltage threshold control is required, such as in regulated 48V power architectures.
SMCJ43AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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):
- 22A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ43AH FAQ
1.How can I place an order for SMCJ43AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43AH 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 SMCJ43AH reliable?
The price and inventory of SMCJ43AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43AH is usually 5 days.
3.What payment methods are accepted for SMCJ43AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43AH?
SMCJ43AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43AH 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 SMCJ43AH?
For technical support, including SMCJ43AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43AH requirements.
6.How does Aetrix verify that SMCJ43AH is sourced from the original manufacturer or authorized distributors?
All SMCJ43AH 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 SMCJ43AH meets industry standards.
7.What is the process for return or replacement of SMCJ43AH?
All SMCJ43AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43AH, 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 SMCJ43AH part is unused and in its original packaging.
Return procedure for SMCJ43AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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