My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ43A
- Part No.:
- SMCJ43A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,420
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ43A 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 load-dump and inductive switching protection in power supply rails and DC input stages.
For engineers reviewing the SMCJ43A datasheet, SMCJ43A pinout, SMCJ43A application, or SMCJ43A equivalent, this page delivers verified electrical parameters, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance status, thermal resistance values (RθJA = 55°C/W), moisture sensitivity level (MSL 1), and precise clamping behavior under 10/1000μs surge conditions.
Technical Context
The SMCJ43A operates as a unidirectional avalanche diode, activated only during reverse overvoltage events above its VBR threshold. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1μA at 43V), while fast response time (<1.0ps) enables suppression of ESD and fast transients before downstream IC damage occurs.
Thermally, it features RθJC = 10°C/W and RθJA = 55°C/W, supporting 5W steady-state dissipation at 25°C ambient. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, with matte tin-plated leads compliant to J-STD-002 solderability standards.
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 test current; defines turn-on threshold tolerance |
| VC @ IPPM | 69.4 V - Clamped voltage across device at 22 A peak impulse current (10/1000μs waveform) |
| PPK | 1500 W - Peak pulse power handling capability under non-repetitive 1 ms surge |
| IR @ VWM | <1 μA - Reverse leakage current at rated stand-off voltage; ensures minimal standby power loss |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; determines required PCB copper area for thermal management |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-diode configuration with cathode band marking. Case material meets UL 94V-0; terminals are matte tin-plated for reliable solder joint formation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during forward surge (e.g., reverse polarity protection) |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 43V rail); avalanches into conduction when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupled noise) - critical for automotive ECUs |
| Clamping ratio VC/VBR | ~1.34 (69.4V / 52.8V) - indicates tight voltage control during surge; lower ratio improves system-level overvoltage margin |
| Moisture sensitivity level | MSL 1 per J-STD-020 - no floor life limitation; suitable for standard SMT reflow without baking |
| Fast response time | <1.0 ps - enables suppression of sub-nanosecond ESD events before logic-level ICs experience latch-up or gate oxide rupture |
| Halogen-free construction | Complies with IEC 61249-2-21 - meets RoHS and environmental compliance requirements for global OEMs |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 42V battery-fed microcontroller power inputs in engine control units against load-dump transients up to 120V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping surges within 1.0ps to limit voltage seen by LDO regulator input. Use Value: With VC = 69.4V at 22A, SMCJ43A holds rail voltage below 70V - well under typical 80V absolute max rating of automotive-grade regulators. | Use Scenario: Safeguarding 24V DC digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring transients. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminal and common, absorbing repetitive 10/1000μs pulses from inductive loads. Use Value: 1500W peak power rating and 55°C/W RθJA enable sustained operation without derating in enclosed cabinets up to +70°C ambient. |
| LED Driver Surge Suppression | Telecom DC Feed Protection |
Use Scenario: Shielding constant-current LED driver ICs from voltage spikes induced by long cable runs in streetlight systems. IC Role / Device Role / Timing Role: TVS mounted at driver input stage, shunting energy from lightning-induced surges on 48V DC distribution lines. Use Value: 43V VWM matches nominal 48V system with 10% tolerance; clamping at 69.4V prevents overvoltage stress on internal MOSFETs and sense resistors. | Use Scenario: Protecting PoE-powered equipment front-end circuitry from induced surges on 48V DC feed lines in telecom base stations. IC Role / Device Role / Timing Role: Unidirectional TVS placed between PSE output and PD input filter, limiting transient overshoot during hot-swap or fault recovery. Use Value: Meets IEC 61000-4-5 Level 3 (1kV/2kV) surge immunity when combined with series impedance; MSL 1 enables automated assembly without moisture concerns. |
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 | Lower peak power rating (600W vs. 1500W); same VWM/VBR/VC specs; SMB package (smaller footprint, higher RθJA = 85°C/W) | Not suitable for high-energy load-dump events; limited to low-energy ESD and signal-line protection | Select only if surge energy is ≤600W and board space is constrained; verify thermal margin with RθJA = 85°C/W |
| 1.5KE43A | Through-hole TO-204AA (DO-41); identical electrical specs but higher mounting height and manual assembly requirement | Used where automated SMT is unavailable or mechanical robustness under vibration is prioritized over density | Choose for legacy designs or harsh-environment industrial controls where leaded reliability outweighs SMT efficiency |
Compared with SMBJ43A and 1.5KE43A, the SMCJ43A uniquely balances 1500W surge capacity, DO-214AB surface-mount compatibility, and MSL 1 handling - making it optimal for high-reliability automotive and industrial power rail protection where both energy absorption and automated manufacturability are required.
Availability
SMCJ43A is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input conditioning, and LED driver surge protection requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMCJ43A 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, MOSFETs, and power management devices since 1979.
The SMCJ series belongs to TSC's high-power transient suppression product line, engineered specifically for ISO 7637-2-compliant automotive and industrial power rail protection - emphasizing robust clamping, low leakage, and automated assembly readiness.
FAQ
What is the clamping voltage of the SMCJ43A at its rated peak pulse current?
The SMCJ43A has a maximum clamping voltage (VC) of 69.4 V at 22 A peak impulse current (IPPM), measured under the standardized 10/1000 μs double-exponential surge waveform. This value ensures downstream components see no more than 69.4 V during worst-case transients, directly supporting design margin calculations for 75 V-rated regulators and controllers. The SMCJ43A achieves this with a clamping ratio of approximately 1.34 relative to its maximum VBR of 52.8 V.
Is the SMCJ43A suitable for bidirectional transient protection?
No, the SMCJ43A is a unidirectional TVS diode and is not rated for bidirectional operation. For symmetrical surge protection (e.g., data lines or AC-coupled signals), a bidirectional variant such as SMCJ43CA must be used. The SMCJ43A features a cathode band marking and conducts only in reverse bias above VBR; forward conduction is limited to VF ≈ 3.5 V at 100 A, which is not intended for clamping in the forward direction.
Does the SMCJ43A meet automotive qualification standards beyond ISO 7637-2?
The SMCJ43A is explicitly validated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms, covering key automotive transient threats. While it is not AEC-Q200 qualified as a standalone component, its construction - including glass-passivated junction, MSL 1 rating, and -55°C to +150°C operating range - aligns with AEC-Q200 stress test categories. System-level qualification requires validation in the end application, but the SMCJ43A provides the foundational surge robustness needed for automotive-grade designs.
What is the thermal resistance and how does it affect PCB layout for the SMCJ43A?
The SMCJ43A has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To maintain TJ ≤ 150°C at full 1500W surge, adequate copper pour (≥250 mm² per pad, 2 oz Cu) and thermal vias are required. In continuous 5W dissipation scenarios, board layout must provide ≥100 mm² of 1 oz Cu per pad with ≥4 thermal vias to keep junction temperature within safe limits. The SMCJ43A's DO-214AB package relies heavily on PCB copper for heat spreading.
How does the SMCJ43A compare to the SMCJ43 (non-A) version?
The SMCJ43A offers tighter breakdown voltage tolerance (47.8–52.8 V) versus the standard SMCJ43 (47.8–58.4 V), resulting in more predictable clamping onset and reduced risk of premature conduction. Both share identical VWM (43 V), VC (69.4 V vs. 76.7 V), and PPK (1500 W), but the "A" suffix denotes enhanced VBR uniformity - critical for designs where consistent turn-on behavior across production lots is required, such as in safety-critical automotive subsystems.
SMCJ43A 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):
- 21.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ43A FAQ
1.How can I place an order for SMCJ43A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43A 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 SMCJ43A reliable?
The price and inventory of SMCJ43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43A is usually 5 days.
3.What payment methods are accepted for SMCJ43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43A?
SMCJ43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43A 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 SMCJ43A?
For technical support, including SMCJ43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43A requirements.
6.How does Aetrix verify that SMCJ43A is sourced from the original manufacturer or authorized distributors?
All SMCJ43A 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 SMCJ43A meets industry standards.
7.What is the process for return or replacement of SMCJ43A?
All SMCJ43A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43A, 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 SMCJ43A part is unused and in its original packaging.
Return procedure for SMCJ43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ43A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
