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Taiwan Semiconductor Corporation SMCJ43H
- Part No.:
- SMCJ43H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43H.pdf
- Description:
- 1500W, 53.1V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:7,198
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Product details
Overview
SMCJ43H 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), 47.8–58.4V breakdown voltage (VBR), and 76.7V maximum clamping voltage (VC) at 20A peak pulse current. It delivers AEC-Q101 qualification, ISO 7637-2 compliance, and sub-1ps response for automotive power line protection.
For engineers reviewing the SMCJ43H datasheet, SMCJ43H pinout, SMCJ43H application, or SMCJ43H equivalent, this page provides verified electrical parameters, thermal performance data, polarity marking details, clamping behavior under 10/1000μs surge, and direct alternatives validated for automotive ESD and load-dump immunity design.
Technical Context
The SMCJ43H operates as a unidirectional avalanche diode optimized for fast transient suppression on DC power rails. Its glass-passivated junction ensures stable VBR tolerance (±5% typical), low leakage (<1μA @ 43V), and robust 150°C junction temperature rating. It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms without derating below 125°C ambient.
Thermal design is supported by RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable 5W steady-state dissipation in standard PCB layouts. The device uses matte tin-plated leads compliant with J-STD-002 and JESD 201 Class 2 whisker resistance, with polarity indicated by cathode band marking per DO-214AB mechanical outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 48V automotive systems. |
| VBR @ IT = 1 mA | 47.8–58.4 V - Measured breakdown range at 1mA test current; ensures predictable turn-on during transients above nominal system voltage. |
| VC @ IPPM = 20 A | 76.7 V - Clamped voltage during 10/1000μs surge; limits downstream IC stress to ≤76.7V under worst-case 1500W transient. |
| PPK | 1500 W - Peak pulse power rating per Fig.5 waveform; supports high-energy load dump and inductive switching events. |
| IR @ VWM | <1 μA - Reverse leakage at 43V; negligible power loss and signal integrity impact in always-on monitoring circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in engine bay or under-hood environments without thermal shutdown. |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking on one end; dual-leaded, non-polarized layout for automated placement. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements. Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; forms current sink during transient clamping. |
| Cathode | High-side input terminal | Connected to protected line (e.g., battery feed); marked by band; conducts avalanche current into ground when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| ISO 7637-2 compliance | Guarantees suppression of standardized automotive transients (Pulse 1/2a/2b/3a/3b) without external circuit modification. |
| Fast response time | <1.0 ps rise time from 0 V to VBR min; prevents overshoot propagation to sensitive CAN/LIN transceivers or microcontrollers. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow; simplifies SMT assembly logistics and reduces handling cost. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 48V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤76.7V at 20A, preventing damage to 60V-rated MOSFETs and gate drivers in power management ICs. | Use Scenario: Shielding 24V digital input modules in factory automation controllers from inductive kickback and ESD. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on field-wire terminals before optocoupler isolation stage. Use Value: Sub-1ps response ensures clamping occurs before 100ns logic-level thresholds are violated, preserving signal integrity in high-speed DI sampling. |
| Telecom PoE Port Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding IEEE 802.3af/at Power over Ethernet (PoE) PSE controller inputs from cable discharge events. IC Role / Device Role / Timing Role: Secondary protection device downstream of primary gas discharge tube (GDT), absorbing residual energy after GDT fires. Use Value: 1500W peak power rating handles >90% of residual surge energy post-GDT, reducing thermal stress on upstream components. | Use Scenario: Suppressing back-EMF from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Freewheeling path across motor terminals to dissipate inductive energy during PWM turn-off. Use Value: 76.7V clamping voltage prevents MOSFET drain-source breakdown during 40V+ flyback spikes, extending FET lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Lower peak power (400W), SMA package (smaller footprint, higher RθJA = 95°C/W), tighter VBR tolerance (5.0–5.6% vs. SMCJ43H's 5.0–10.0%). | Not suitable for ISO 7637-2 Pulse 5a load dump; limited to lower-energy ESD and signal-line transients. | Select SMAJ43A only for space-constrained consumer electronics where 400W surge capacity suffices. |
| 1.5KE43A | Through-hole TO-204AA (DO-41) package, same VWM/VBR specs, but slower response (>1ns), no AEC-Q101 or ISO 7637-2 validation. | Requires manual insertion or wave soldering; unsuitable for automated automotive production lines or vibration-prone environments. | Choose 1.5KE43A only for legacy through-hole designs or prototyping where SMT assembly is unavailable. |
Compared with SMAJ43A and 1.5KE43A, the SMCJ43H uniquely combines 1500W surge capability, AEC-Q101 qualification, ISO 7637-2 compliance, and DO-214AB SMT compatibility-making it the only option qualified for production automotive power rail protection without derating or secondary clamping stages.
Availability
SMCJ43H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input conditioning, and telecom PoE port hardening requiring stable component supply across multi-year production cycles.
Supply support for SMCJ43H 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 SMCJ series belongs to TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient immunity in 12V/24V/48V automotive power networks and industrial control interfaces subject to ISO 7637-2 and IEC 61000-4-5 stress.
FAQ
What is the clamping voltage of the SMCJ43H at its rated peak pulse current?
The SMCJ43H has a maximum clamping voltage (VC) of 76.7 V at 20 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 5 in the official Taiwan Semiconductor datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. Designers use this parameter to verify that downstream components remain within their absolute maximum ratings during surge conditions.
Is the SMCJ43H suitable for bidirectional transient suppression?
No, the SMCJ43H is a unidirectional TVS diode intended for DC power line protection with defined anode/cathode polarity. For bidirectional applications such as AC lines or data bus protection, Taiwan Semiconductor specifies variants with "CH" or "CAH" suffixes (e.g., SMCJ43CH). Using SMCJ43H in reverse-biased configurations risks premature failure due to lack of symmetric breakdown characteristics.
Does the SMCJ43H meet automotive qualification standards?
Yes, the SMCJ43H is explicitly AEC-Q101 qualified and tested for automotive-grade reliability, including temperature cycling, high-temperature reverse bias (HTRB), and ESD per JS-001. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements-making it suitable for engine control units, body control modules, and ADAS power supplies.
What is the marking code for the SMCJ43H on the device body?
The SMCJ43H is marked with the code "GFS" on its package surface, per the Taiwan Semiconductor ordering table. This two-letter prefix identifies the specific voltage variant within the SMCJ family and is used for visual verification during incoming inspection and board-level troubleshooting. The marking appears adjacent to the cathode band on the DO-214AB body.
How does the thermal performance of the SMCJ43H affect PCB layout decisions?
The SMCJ43H has RθJA = 55°C/W and RθJC = 10°C/W, meaning effective heat dissipation requires ≥25 mm² of 1-oz copper connected to both leads via thermal vias. Reducing pad area or omitting copper pour increases junction temperature beyond 150°C during repeated surges, risking parametric shift or catastrophic failure. Layouts must follow Taiwan Semiconductor's suggested pad dimensions and avoid solder mask over thermal pads.
SMCJ43H 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:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 20A
- 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)
SMCJ43H FAQ
1.How can I place an order for SMCJ43H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43H 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 SMCJ43H reliable?
The price and inventory of SMCJ43H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43H is usually 5 days.
3.What payment methods are accepted for SMCJ43H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43H?
SMCJ43H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43H 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 SMCJ43H?
For technical support, including SMCJ43H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43H requirements.
6.How does Aetrix verify that SMCJ43H is sourced from the original manufacturer or authorized distributors?
All SMCJ43H 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 SMCJ43H meets industry standards.
7.What is the process for return or replacement of SMCJ43H?
All SMCJ43H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43H, 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 SMCJ43H part is unused and in its original packaging.
Return procedure for SMCJ43H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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