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Taiwan Semiconductor Corporation 1.5SMC24A
- Part No.:
- 1.5SMC24A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC24A.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,646
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Product details
Overview
1.5SMC24A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 22.8–25.2 V breakdown voltage (VBR), 20.5 V working stand-off voltage (VWM), 33.2 V maximum clamping voltage (VC) at 47 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom front-ends, industrial I/O ports, and automotive body control modules.
For engineers reviewing the 1.5SMC24A datasheet, 1.5SMC24A pinout, 1.5SMC24A application, or 1.5SMC24A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction-to-ambient thermal resistance (50 °C/W), unidirectional polarity marking, and DO-214AB (SMC) package compatibility with automated SMT assembly.
Technical Context
The 1.5SMC24A operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1 ps response time to transient events. Its unidirectional configuration enables asymmetric clamping - forward conduction limited to 3.5 V at 50 A (per family spec), while reverse breakdown is tightly controlled between 22.8 V and 25.2 V at 1 mA test current.
Thermally, it sustains operation from –55 °C to +150 °C junction temperature, with 15 °C/W junction-to-case resistance enabling effective heat transfer to PCB copper. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for reflow soldering without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 22.8 V / 25.2 V - defines guaranteed reverse breakdown threshold at 1 mA; ensures reliable triggering before downstream IC damage |
| VWM | 20.5 V - maximum continuous reverse voltage the device blocks without significant leakage (<1 µA) |
| VC @ IPPM | 33.2 V at 47 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure |
| PPK | 1500 W - peak pulse power handling per single non-repetitive event; supports robust immunity to lightning-induced surges |
| RθJA | 50 °C/W - thermal resistance from junction to ambient; informs derating requirements above 25 °C ambient |
| IR @ VWM | <1 µA - low leakage ensures minimal power loss and no interference with high-impedance sensing circuits |
| TJ max | +150 °C - maximum allowable junction temperature; sets upper limit for thermal design margin in enclosed enclosures |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to lower-potential side (e.g., GND or return path); defines polarity-sensitive placement on PCB |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 24 V rail); conducts transient energy to ground when VLINE exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche behavior across temperature and lifetime; eliminates passivation-related drift in VBR |
| <1 ps response time | Ensures clamping activation before ESD or fast transients (e.g., relay bounce) propagate into sensitive logic or analog stages |
| ISO 7637-2 compliance | Validated against automotive load-dump and coupled transient waveforms (Pulse 1/2a/2b/3a/3b), supporting AEC-Q101-aligned designs |
| Moisture Sensitivity Level 1 | Permits direct placement onto PCB without baking; eliminates production delays and moisture-related popcorning during reflow |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives; supports environmentally compliant manufacturing and end-of-life recycling |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input channels in programmable logic controllers exposed to inductive kickback from solenoid drivers and field wiring faults. IC Role / Device Role / Timing Role: Primary unidirectional TVS clamp placed upstream of input conditioning circuitry (RC filter, optocoupler, or ADC front-end). Use Value: Limits transient voltage to ≤33.2 V during 47 A surges, preventing latch-up or gate oxide rupture in downstream protection ICs and microcontrollers. |
Use Scenario: Power supply inputs to BCM modules subjected to ISO 7637-2 Pulse 2b (battery disconnect) and Pulse 5a (load dump). IC Role / Device Role / Timing Role: First-line overvoltage suppression on main 24 V distribution rail before DC-DC converters and CAN transceivers. Use Value: Absorbs up to 1500 W of pulse energy without degradation, maintaining system uptime during vehicle-level electrical disturbances. |
| Telecom Power Feeds | Medical Diagnostic Equipment Interfaces |
Use Scenario: -48 V DC power feeds in remote radio units and base station backhaul interfaces vulnerable to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at connector entry point, coordinated with gas discharge tube (GDT) for staged protection. Use Value: Clamps induced transients within 1 ps to protect PoE-like DC-DC controllers and Ethernet PHYs rated for ≤36 V absolute maximum. |
Use Scenario: External sensor interface ports (e.g., ECG lead connectors) requiring ESD immunity per IEC 61000-4-2 Level 4 (±15 kV contact). IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS placed directly at connector pins to shunt ESD before high-impedance amplifier inputs. Use Value: Prevents input-stage saturation or CMOS gate damage while adding negligible offset error (<0.1 µA bias shift) to precision analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A (Bourns) | Same DO-214AA (SMB) package; 24 V nominal VBR, but lower PPK = 600 W and higher VC = 38.9 V at 15.4 A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump where 1500 W capability is required | Select only if space-constrained layouts prohibit DO-214AB footprint and surge energy is confirmed ≤600 W |
| 1.5KE24A (ON Semiconductor) | Through-hole DO-15 package; identical VBR/VC specs but 1500 W rating applies only at TA = 25 °C with heatsinking - RθJA = 15 °C/W vs. 50 °C/W for 1.5SMC24A | Requires PCB pad thermal relief and manual assembly; incompatible with high-volume SMT lines | Prefer for prototyping or legacy through-hole systems; avoid in new SMT designs targeting automated manufacturing |
Compared with SMBJ24A and 1.5KE24A, the 1.5SMC24A delivers superior surge robustness in surface-mount form - combining 1500 W rating, 50 °C/W thermal resistance, and DO-214AB compatibility for direct integration into automotive and industrial PCBs without layout redesign.
Availability
1.5SMC24A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power feed applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5SMC24A 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 - serving industrial, automotive, and telecom markets since 1979.
The 1.5SMCxx(A) series was engineered for high-reliability surface-mount surge protection in harsh environments, emphasizing tight VBR tolerance, low clamping ratio, and compliance with ISO 7637-2 and J-STD-020 standards.
FAQ
What is the maximum clamping voltage of the 1.5SMC24A under a 10/1000 µs surge?
The 1.5SMC24A exhibits a maximum clamping voltage (VC) of 33.2 V when subjected to its rated peak pulse current of 47 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 33.2 V during such transient events - critical for protecting 24 V-rated ICs with 36 V absolute maximum ratings.
Is the 1.5SMC24A suitable for bidirectional transient suppression?
No - the 1.5SMC24A is a unidirectional TVS diode, intended for DC circuits with defined polarity. For bidirectional applications (e.g., AC lines or data buses), the 1.5SMC24CA variant must be used. The "A" suffix denotes tighter VBR tolerance (±5%), not bidirectional capability; polarity is indicated by the cathode band on the DO-214AB package.
What is the leakage current specification for the 1.5SMC24A at its working voltage?
At its working stand-off voltage (VWM) of 20.5 V, the 1.5SMC24A specifies a maximum blocking leakage current (IR) of 1 µA at 25 °C. This ultra-low leakage ensures minimal power loss in always-on 24 V systems and avoids loading high-impedance monitoring circuits - verified per the manufacturer's electrical specifications table.
Does the 1.5SMC24A meet automotive transient immunity standards?
Yes - the 1.5SMC24A is explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test waveforms. Its 1500 W peak power rating and 33.2 V clamping performance enable robust protection against load dump, inductive switching, and coupled noise in 24 V automotive subsystems, including body control modules and infotainment power supplies.
What is the thermal resistance and maximum junction temperature of the 1.5SMC24A?
The 1.5SMC24A has a junction-to-ambient thermal resistance (RθJA) of 50 °C/W and a maximum junction temperature (TJ) of +150 °C. These values allow derating calculations for elevated ambient conditions - for example, at 85 °C ambient, the device supports ~12.6 W steady-state dissipation before reaching TJ limit, assuming no additional heatsinking.
1.5SMC24A 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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 47A
- 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)
1.5SMC24A FAQ
1.How can I place an order for 1.5SMC24A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC24A 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 1.5SMC24A reliable?
The price and inventory of 1.5SMC24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC24A is usually 5 days.
3.What payment methods are accepted for 1.5SMC24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC24A?
1.5SMC24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC24A 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 1.5SMC24A?
For technical support, including 1.5SMC24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC24A requirements.
6.How does Aetrix verify that 1.5SMC24A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC24A 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 1.5SMC24A meets industry standards.
7.What is the process for return or replacement of 1.5SMC24A?
All 1.5SMC24A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC24A, 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 1.5SMC24A part is unused and in its original packaging.
Return procedure for 1.5SMC24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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