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Taiwan Semiconductor Corporation 1.5SMC43
- Part No.:
- 1.5SMC43
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC43.pdf
- Description:
- 1500W, 43V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,813
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Product details
Overview
1.5SMC43 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, designed for robust ESD and surge protection in DC power rails and signal lines. It features a 38.7–47.3 V breakdown voltage (VBR), 34.8 V working stand-off voltage (VWM), 61.9 V maximum clamping voltage (VC) at 25 A peak pulse current, and 1500 W peak pulse power rating.
For engineers reviewing the 1.5SMC43 datasheet, 1.5SMC43 pinout, 1.5SMC43 application, or 1.5SMC43 equivalent, key selection considerations include its unidirectional polarity, 1.0 mA test current specification, <1 μA leakage at VWM, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and suitability for automotive load-dump and industrial I/O protection where fast clamping (<1.0 ps response) and low thermal resistance (RθJC = 15 °C/W) are critical.
Technical Context
The 1.5SMC43 operates as a silicon avalanche diode with glass-passivated junction, optimized for unidirectional transient suppression in DC circuits. Its clamping behavior follows standardized 10/1000 µs waveform per R.E.A., delivering predictable VC = 61.9 V at IPPM = 25 A while maintaining low leakage (≤1 µA at 34.8 V).
Thermally, it supports continuous operation up to TJ = 150 °C with RθJA = 50 °C/W and RθJC = 15 °C/W, enabling reliable performance in high-ambient environments when mounted on adequate copper area. Polarity is marked by cathode band per DO-214AB mechanical outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 38.7 V / 47.3 V - defines minimum and maximum guaranteed avalanche initiation range at 1.0 mA test current |
| VWM | 34.8 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 61.9 V at 25 A - clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPK | 1500 W - peak pulse power handling capability under standardized non-repetitive surge conditions |
| IR @ VWM | ≤1 µA - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150 °C - maximum junction temperature supporting operation in under-hood automotive or industrial enclosures |
| RθJC | 15 °C/W - enables efficient heat transfer from junction to case, critical for sustained surge duty cycles |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line's lower-potential side | Enables unidirectional clamping - conducts only when cathode is > anode by ≥VBR |
| Cathode | Current exit point in forward bias; marked by band; connected to system ground or higher-potential rail | Defines polarity-sensitive placement - incorrect orientation disables protection function |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Fast response time | Typically <1.0 ps - limits voltage overshoot before clamping engages, protecting nanosecond-scale logic |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | Per J-STD-020 - allows unlimited floor life before reflow, eliminating bake requirements in SMT assembly |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives - supports environmentally regulated industrial and automotive programs |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 24 V DC supply lines in vehicle body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and local regulator input. Use Value: Clamps 120 V transients to ≤61.9 V within <1 ps, preventing damage to downstream LDOs and microcontrollers rated for 40 V absolute max. | Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field-wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact or sensor input traces before optocoupler or Schmitt trigger. Use Value: Limits induced lightning or ESD spikes to safe levels while maintaining <1 µA leakage at 34.8 V, preserving input threshold accuracy. |
| Telecom Power Feeds | Consumer Appliance Motor Drivers |
Use Scenario: Shielding PoE-powered Ethernet switch ports from AC/DC adapter transients and cable-induced surges. IC Role / Device Role / Timing Role: Secondary protection stage after primary common-mode choke, across DC output rails. Use Value: Delivers 1500 W peak power absorption without degradation, meeting IEC 61000-4-5 Level 3 immunity requirements. | Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Freewheeling clamp across motor terminals, oriented anode-to-motor, cathode-to-VCC. Use Value: Withstands 200 A non-repetitive forward surge (IFSM) and clamps flyback voltage to 61.9 V, extending MOSFET 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 |
|---|---|---|---|
| SMBJ43A | Same VBR range (38.7–47.3 V) but SMB package (smaller footprint, lower PPK = 600 W) | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 1 or high-current load dump | Select 1.5SMC43 when 1500 W peak power and DO-214AB thermal mass are required for automotive-grade robustness. |
| 1.5KE43A | Through-hole TO-204AA (DO-41) package; identical electrical specs but no SMT compatibility or moisture level 1 rating | Requires wave soldering; incompatible with automated pick-and-place and high-volume SMT lines | Choose 1.5SMC43 for surface-mount production, J-STD-020 compliance, and space-constrained PCB layouts. |
Compared with SMBJ43A and 1.5KE43A, the 1.5SMC43 uniquely combines 1500 W surge capacity, DO-214AB thermal performance (RθJC = 15 °C/W), and J-STD-020 Level 1 handling - making it the preferred choice for automotive and industrial SMT designs demanding high-reliability transient immunity without layout or process compromise.
Availability
1.5SMC43 is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC I/O hardening, telecom power feed conditioning, and consumer appliance motor driver circuits requiring stable component supply and full ISO 7637-2 compliance.
Supply support for 1.5SMC43 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, automotive, and consumer markets.
The 1.5SMC43 belongs to TSC's SMC-family of high-power surface-mount TVS diodes, engineered specifically for automotive load-dump immunity and industrial surge standards where 1500 W clamping and DO-214AB thermal efficiency are mandatory.
FAQ
What is the polarity configuration of the 1.5SMC43?
The 1.5SMC43 is a unidirectional TVS diode with cathode marked by a band on the DO-214AB package. It conducts only when cathode voltage exceeds anode voltage by ≥38.7 V, making it suitable for DC rail protection where polarity is fixed. Bidirectional variants require "C" or "CA" suffixes (e.g., 1.5SMC43C), which the 1.5SMC43 does not have.
Does the 1.5SMC43 meet automotive transient immunity standards?
Yes, the 1.5SMC43 meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling). Its 1500 W peak power rating, 61.9 V clamping at 25 A, and thermal design (RθJC = 15 °C/W) enable compliance in 12 V and 24 V automotive subsystems without derating.
What is the maximum leakage current of the 1.5SMC43 at its working voltage?
The 1.5SMC43 exhibits ≤1 µA maximum blocking leakage current (IR) at its working stand-off voltage (VWM) of 34.8 V, measured at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in always-on systems.
Can the 1.5SMC43 be used in bidirectional signal line protection?
No - the 1.5SMC43 is unidirectional only. For bidirectional AC or data-line protection, select the 1.5SMC43C or 1.5SMC43CA variant, which provides symmetrical clamping in both directions. Using the 1.5SMC43 on AC signals risks forward conduction and failure due to its single-junction asymmetry.
What is the thermal resistance from junction to ambient for the 1.5SMC43?
The 1.5SMC43 has a typical junction-to-ambient thermal resistance (RθJA) of 50 °C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). This value assumes no additional heatsinking; actual board-level RθJA improves significantly with internal copper planes and thermal vias, supporting continuous operation up to +150 °C junction temperature.
1.5SMC43 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 34.8V
- Voltage - Breakdown (Min):
- 38.7V
- Voltage - Clamping (Max) @ Ipp:
- 61.9V
- Current - Peak Pulse (10/1000µs):
- 25A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC43 FAQ
1.How can I place an order for 1.5SMC43 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC43 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 1.5SMC43 reliable?
The price and inventory of 1.5SMC43 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC43 is usually 5 days.
3.What payment methods are accepted for 1.5SMC43?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC43 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC43?
1.5SMC43 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC43 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 1.5SMC43?
For technical support, including 1.5SMC43 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC43 requirements.
6.How does Aetrix verify that 1.5SMC43 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC43 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 1.5SMC43 meets industry standards.
7.What is the process for return or replacement of 1.5SMC43?
All 1.5SMC43 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC43, 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 1.5SMC43 part is unused and in its original packaging.
Return procedure for 1.5SMC43:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC43 Tags
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