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Taiwan Semiconductor Corporation 1.5SMC24
- Part No.:
- 1.5SMC24
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC24.pdf
- Description:
- 1500W, 24V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,968
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Product details
Overview
1.5SMC24 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level surge protection in DC power rails and signal lines. It features a 21.6–26.4 V breakdown voltage (VBR), 19.4 V working stand-off voltage (VWM), 34.7 V maximum clamping voltage (VC) at 45 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom interfaces, industrial I/O modules, and automotive body control units.
For engineers reviewing the 1.5SMC24 datasheet, 1.5SMC24 pinout, 1.5SMC24 application, or 1.5SMC24 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, thermal resistance (RθJA = 50 °C/W), DO-214AB (SMC) package compatibility, and leakage current ≤1 µA at VWM.
Technical Context
The 1.5SMC24 operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1 ps response time to fast transients. Its unidirectional configuration enables asymmetric clamping - forward conduction only during reverse overvoltage events - and supports compliance with ISO 7637-2 for automotive load-dump and switching surge immunity.
Thermally, it uses a DO-214AB (SMC) package with RθJC = 15 °C/W and RθJA = 50 °C/W, enabling reliable operation up to TJ = 150 °C. The device exhibits a VBR temperature coefficient of 0.094 %/°C, ensuring predictable voltage drift across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 21.6 V / 26.4 V - defines minimum and maximum guaranteed breakdown threshold at 1 mA test current |
| VWM | 19.4 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 34.7 V at 45 A - clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPK | 1500 W - peak pulse power handling capability per single non-repetitive surge event |
| 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 enclosed industrial enclosures |
| RθJA | 50 °C/W - thermal resistance from junction to ambient, guiding PCB copper area requirements |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-diode unidirectional configuration. Cathode indicated by molded band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during reverse surge |
| Cathode | Clamping reference terminal | Connected to protected line (e.g., 24 V rail); avalanche breakdown occurs between cathode and anode |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime and humidity exposure |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking - no floor life limitation per J-STD-020 |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
| UL 94V-0 molding compound | Self-extinguishing encapsulation material critical for safety-critical industrial and automotive applications |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from inductive kickback and ESD. IC Role / Device Role / Timing Role: Standoff TVS diode placed between field input and controller IC, clamping transients before they reach isolation or conditioning circuitry. Use Value: Limits voltage to ≤34.7 V during 45 A surges, preserving input stage reliability without adding propagation delay or loading. | Use Scenario: Safeguarding LIN bus and sensor supply lines in BCMs exposed to load-dump pulses per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary surge suppression element on 24 V battery-supplied rails feeding microcontrollers and CAN/LIN transceivers. Use Value: Withstands 1500 W peak power and maintains <1 µA leakage at 19.4 V, avoiding false wake-up or quiescent current violations. |
| Telecom Power Interface | Factory Automation Sensor Hub |
Use Scenario: Front-end protection for PoE-powered remote units receiving 24–48 V DC via long cable runs susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: First-line unidirectional TVS on DC input, coordinated with upstream fuse and downstream DC-DC converter. Use Value: Clamps 10/1000 µs transients to 34.7 V while surviving repeated 1500 W pulses - validated per IEC 61000-4-5 Level 4. | Use Scenario: Protecting analog 4–20 mA loop receivers and digital encoder inputs in robotic motion controllers. IC Role / Device Role / Timing Role: Localized TVS mounted directly at connector entry point to minimize inductance and improve clamping efficacy. Use Value: Sub-1 ps response time ensures clamping initiates before transient energy couples into precision amplifiers or ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | 600 W rating (vs. 1500 W), DO-214AA (SMB) package, 38.9 V clamping at 25 A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or high-current load dumps | Select when space-constrained layouts require smaller footprint and surge threat level is ≤600 W |
| 1.5KE24A | Through-hole TO-204AE (DO-41), same 1500 W rating but higher RθJA (~65 °C/W), 38.9 V clamping | Not suitable for automated SMT assembly; requires wave solder or hand-soldering | Select only for legacy through-hole designs or prototyping where rework tolerance outweighs production efficiency |
Compared with SMBJ24A and 1.5KE24A, the 1.5SMC24 delivers superior surge robustness in a compact SMT package - enabling higher power density, full ISO 7637-2 compliance, and seamless integration into high-volume automated production lines.
Availability
1.5SMC24 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power interface designs requiring stable component supply, consistent surge performance, and long-term lifecycle support.
Supply support for 1.5SMC24 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 1.5SMC series was engineered specifically for high-power, surface-mount transient suppression in harsh environments - balancing clamping performance, thermal resilience, and SMT manufacturability across 6.8 V to 200 V standoff voltages.
FAQ
What is the clamping voltage of the 1.5SMC24 under a standard 10/1000 µs surge?
The 1.5SMC24 has a maximum clamping voltage (VC) of 34.7 V at 45 A peak pulse current (IPPM) under the 10/1000 µs waveform defined in IEC 61000-4-5. This value is measured per ANSI/IEEE C62.35 and guarantees voltage limiting during standardized surge events - critical for protecting downstream 3.3 V or 5 V logic powered from a 24 V rail. The 1.5SMC24 achieves this while maintaining ≤1 µA leakage at its 19.4 V working stand-off voltage.
Is the 1.5SMC24 suitable for bidirectional transient protection?
No, the 1.5SMC24 is a unidirectional TVS diode and is not rated for bidirectional operation. For symmetrical surge protection (e.g., AC lines or differential buses), Taiwan Semiconductor specifies the 1.5SMC24C or 1.5SMC24CA variants - which include "C" or "CA" suffixes and feature identical VBR, VC, and PPK ratings in both polarities. Using the 1.5SMC24 in reverse-biased configurations beyond its specified VWM may cause premature failure.
What is the thermal resistance and maximum junction temperature of the 1.5SMC24?
The 1.5SMC24 has a junction-to-ambient thermal resistance (RθJA) of 50 °C/W and a maximum junction temperature (TJ) of +150 °C. These values assume standard JEDEC high-K board conditions (2s2p copper). At 25 °C ambient, the device can dissipate up to 6.5 W continuously; derating applies above 25 °C per the published pulse derating curve. The 1.5SMC24's RθJC is 15 °C/W, confirming efficient heat transfer to the PCB pad.
Does the 1.5SMC24 meet automotive surge immunity standards?
Yes, the 1.5SMC24 meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), making it suitable for 12 V and 24 V automotive subsystems including body control modules and infotainment power supplies. It is not rated for Pulse 5a (load dump) without external coordination (e.g., upstream fuse or series impedance), as that test requires sustained energy handling beyond single-pulse rating.
What marking code identifies the 1.5SMC24 on the DO-214AB package?
The 1.5SMC24 is marked with the code "ELJ" on the device body, per Taiwan Semiconductor's ordering documentation. This 3-character code appears adjacent to the cathode band on the DO-214AB (SMC) package. The "ELJ" marking is unique to the 1.5SMC24 variant and distinguishes it from the 1.5SMC24A (marked "EMJ"), which has tighter VBR tolerance (22.8–25.2 V vs. 21.6–26.4 V) and slightly lower clamping voltage (33.2 V).
1.5SMC24 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):
- 19.4V
- Voltage - Breakdown (Min):
- 21.6V
- Voltage - Clamping (Max) @ Ipp:
- 34.7V
- Current - Peak Pulse (10/1000µs):
- 45A
- 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)
1.5SMC24 FAQ
1.How can I place an order for 1.5SMC24 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC24 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 1.5SMC24 reliable?
The price and inventory of 1.5SMC24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC24 is usually 5 days.
3.What payment methods are accepted for 1.5SMC24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC24?
1.5SMC24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC24 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 1.5SMC24?
For technical support, including 1.5SMC24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC24 requirements.
6.How does Aetrix verify that 1.5SMC24 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC24 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 1.5SMC24 meets industry standards.
7.What is the process for return or replacement of 1.5SMC24?
All 1.5SMC24 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC24, 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 1.5SMC24 part is unused and in its original packaging.
Return procedure for 1.5SMC24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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