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Taiwan Semiconductor Corporation 1.5SMC43A
- Part No.:
- 1.5SMC43A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC43A.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,982
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Product details
Overview
1.5SMC43A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 40.9–45.2 V breakdown voltage (VBR), 36.8 V working stand-off voltage (VWM), 59.3 V maximum clamping voltage (VC) at 26 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom front-ends and industrial I/O interfaces.
For engineers reviewing the 1.5SMC43A datasheet, 1.5SMC43A pinout, 1.5SMC43A application, or 1.5SMC43A equivalent, this page delivers verified electrical parameters, DO-214AB package details, clamping performance under ISO 7637-2 transients, thermal resistance values, and real-world ESD/switching-surge protection use cases - all specific to the 1.5SMC43A variant.
Technical Context
The 1.5SMC43A operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response (<1.0 ps) to transient events including ESD (IEC 61000-4-2), load dump (ISO 7637-2 Pulse 5a), and inductive switching surges. Its 150 °C maximum junction temperature and JESD201 Class 2 whisker resistance support reliability in automotive and industrial environments.
Thermal performance is defined by RθJA = 50 °C/W and RθJC = 15 °C/W, enabling effective heat dissipation in high-density SMT layouts. The device exhibits <1 µA leakage at 36.8 V and a VBR temperature coefficient of 0.101 %/°C - critical for stable clamping across operating temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V - ensures reliable avalanche conduction onset above normal 36.8 V rail voltage, preventing false triggering |
| VWM | 36.8 V - maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VC @ IPPM | 59.3 V at 26 A - limits downstream voltage stress during 10/1000 µs transients to safe levels for 48 V system ICs |
| PPK | 1500 W - sustains single-pulse surge energy up to 1500 W for 1 ms, meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity |
| IR @ VWM | <1 µA - minimizes standby power loss and avoids interference in high-impedance sensing circuits |
| TJ max | +150 °C - supports operation in under-hood automotive or enclosed industrial enclosures without derating |
| RθJA | 50 °C/W - defines thermal rise from junction to ambient under standard PCB layout (1 sq-in copper pad) |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, RoHS-compliant, halogen-free, UL 94V-0 molded compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes clamping path during positive transients |
| Cathode | High-side connection point | Connected to protected line (e.g., 48 V rail); conducts avalanche current when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under humidity and thermal cycling |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream circuitry (e.g., CAN transceivers, ADC inputs) experiences overvoltage |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive load-dump and supply-line transient immunity without external filtering |
| Moisture sensitivity level 1 (J-STD-020) | Enables standard SMT reflow without baking or special handling, reducing manufacturing cost |
| Unidirectional polarity marking | Cathode band enables correct orientation during automated placement, preventing reverse-bias failure |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input channels on programmable logic controller modules exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between terminal block and input conditioning circuitry. Use Value: Limits transient voltage to ≤59.3 V during 26 A 10/1000 µs pulses, protecting 3.3 V/5 V interface ICs downstream. |
Use Scenario: Power supply input to BCM microcontroller unit subjected to ISO 7637-2 Pulse 5a (load dump) up to 60 V. IC Role / Device Role / Timing Role: First-stage clamping device parallel to bulk capacitor, absorbing surge energy before LDO regulators. Use Value: Withstands 1500 W peak power for 1 ms, maintaining VIN below 60 V and avoiding brownout or latch-up. |
| Telecom Ethernet Port Surge Protection | Smart Meter AC/DC Power Input |
|
Use Scenario: 48 V phantom power line feeding PoE-powered devices, vulnerable to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional TVS on DC feed line, coordinated with common-mode chokes and GDTs. Use Value: Clamps differential surges to ≤59.3 V within <1 ps, preserving PHY IC integrity while passing IEEE 802.3af/at compliance tests. |
Use Scenario: Rectified AC input stage of smart electricity meters, subject to utility grid switching transients and capacitor discharge events. IC Role / Device Role / Timing Role: Standoff-rated protector across bulk storage capacitor, shunting surge current away from metering SoC. Use Value: Blocks 36.8 V continuously but clamps 1 kV/100 A transients to 59.3 V, ensuring metrology accuracy remains unaffected. |
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 (Bourns) | Same DO-214AA package (smaller footprint), 58.1 V clamping at 25.5 A, 600 W rating | Limited to lower-energy transients; not rated for ISO 7637-2 Pulse 5a | Select SMBJ43A only for space-constrained consumer electronics with sub-600 W surge requirements |
| 1.5KE43A (Taiwan Semiconductor) | Through-hole DO-15 package, identical VBR/VC specs, same 1500 W rating | Requires wave soldering or hand assembly; unsuitable for fully automated SMT lines | Choose 1.5KE43A only when legacy through-hole design or higher mechanical robustness is required |
Compared with SMBJ43A and 1.5KE43A, the 1.5SMC43A uniquely combines 1500 W surge capability with DO-214AB SMT packaging, enabling high-power transient protection in automated, high-density board assemblies without compromising clamping performance or thermal margin.
Availability
1.5SMC43A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom Ethernet port surge protection, and smart meter AC/DC power input applications requiring stable component supply and full ISO 7637-2 compliance.
Supply support for 1.5SMC43A 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 - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q200-qualified product lines.
The 1.5SMC series was developed specifically for high-reliability surface-mount transient suppression in automotive, industrial, and telecom infrastructure - emphasizing robust clamping, low leakage, and JEDEC-compliant SMT manufacturability.
FAQ
What is the clamping voltage of the 1.5SMC43A under maximum rated surge current?
The 1.5SMC43A has a maximum clamping voltage (VC) of 59.3 V at 26 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 59.3 V during worst-case transient events, making the 1.5SMC43A suitable for protecting 48 V systems with 3.3 V or 5 V interface ICs.
Is the 1.5SMC43A unidirectional or bidirectional, and how is polarity identified?
The 1.5SMC43A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. Polarity is marked by a cathode band on the DO-214AB package body - the banded end connects to the protected line (e.g., 48 V rail), while the anode connects to ground. This configuration provides asymmetric protection ideal for DC power rails where reverse voltage is not expected.
Does the 1.5SMC43A meet automotive transient immunity standards?
Yes, the 1.5SMC43A meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (ground noise) requirements. While it is not rated for Pulse 5a (load dump) alone, it is commonly used in conjunction with upstream filters and regulators to achieve full automotive-grade immunity in BCM and ECU designs using the 1.5SMC43A.
What is the maximum steady-state power dissipation for the 1.5SMC43A?
The 1.5SMC43A has a steady-state power dissipation (PD) of 6.5 W at TA = 25 °C. This rating applies to continuous DC or low-frequency AC conditions - not transient events. In practice, the device operates near zero power under normal bias (leakage <1 µA at 36.8 V), and only dissipates significant power during transient clamping, where its 1500 W peak rating governs short-duration behavior.
Can the 1.5SMC43A be used in place of the 1.5SMC43 without redesigning the PCB?
No - the 1.5SMC43A and 1.5SMC43 are distinct variants: the "A" suffix denotes tighter VBR tolerance (±5% vs. ±10%). The 1.5SMC43A has VBR = 40.9–45.2 V and VC = 59.3 V, while the non-A version has VBR = 38.7–47.3 V and VC = 61.9 V. Though both use DO-214AB and share pinout, substituting them requires verifying system-level clamping margin and leakage behavior - the 1.5SMC43A is not a drop-in replacement for the 1.5SMC43.
1.5SMC43A 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):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 26A
- 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)
1.5SMC43A FAQ
1.How can I place an order for 1.5SMC43A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC43A 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 1.5SMC43A reliable?
The price and inventory of 1.5SMC43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC43A is usually 5 days.
3.What payment methods are accepted for 1.5SMC43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC43A?
1.5SMC43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC43A 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 1.5SMC43A?
For technical support, including 1.5SMC43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC43A requirements.
6.How does Aetrix verify that 1.5SMC43A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC43A 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 1.5SMC43A meets industry standards.
7.What is the process for return or replacement of 1.5SMC43A?
All 1.5SMC43A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC43A, 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 1.5SMC43A part is unused and in its original packaging.
Return procedure for 1.5SMC43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC43A Tags
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