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Taiwan Semiconductor Corporation 1.5SMC12A
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- Part No.:
- 1.5SMC12A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC12A.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,157
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Product details
Overview
1.5SMC12A 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 12.6 V maximum breakdown voltage (VBR), 10.2 V working stand-off voltage (VWM), 16.7 V maximum clamping voltage (VC) at 94 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom front-ends, industrial I/O modules, and automotive body control units.
For engineers reviewing the 1.5SMC12A datasheet, 1.5SMC12A pinout, 1.5SMC12A application, or 1.5SMC12A equivalent, key selection criteria include clamping performance under 94 A surge, leakage current ≤1 µA at 10.2 V, DO-214AB (SMC) package thermal resistance (RθJA = 50 °C/W), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transients.
Technical Context
The 1.5SMC12A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-1 ps response time and stable clamping across temperature. Its single-die DO-214AB construction supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
It delivers 1500 W peak pulse power handling at TA = 25°C, derating linearly above that ambient per Fig.2, with junction temperature range of –55 °C to +150 °C and thermal resistance from junction-to-ambient at 50 °C/W. The device exhibits <1 µA blocking leakage at rated VWM, enabling low-power system compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 11.4 V / 12.6 V - defines reliable avalanche initiation window under 1 mA test current; ensures consistent turn-on across production lots |
| VWM | 10.2 V - maximum continuous reverse operating voltage before significant leakage; sets safe DC rail margin for 12 V systems |
| VC@IPPM | 16.7 V at 94 A - clamped voltage during 10/1000 µs surge; limits downstream IC stress to <17 V during load dump or ESD events |
| PPK | 1500 W - peak pulse power dissipation capability; sustains high-energy transients without failure per Fig.5 waveform |
| IR@VWM | ≤1 µA - ultra-low reverse leakage at stand-off voltage; preserves battery life and signal integrity in always-on circuits |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood or enclosed industrial enclosures |
| RθJA | 50 °C/W - thermal resistance from junction to ambient; informs heatsinking needs when operating near power derating limit |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case molded with UL 94V-0 compound; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during forward surge (IFSM = 200 A, VF = 3.5 V @ 50 A) |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); avalanches into low-impedance state when VAK exceeds VBR, shunting surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term reliability and stable VBR drift <0.078 %/°C across –55 °C to +150 °C operating range |
| Sub-1 ps response time | Clamps ESD and fast transients before sensitive logic or analog circuitry experiences overstress |
| ISO 7637-2 compliance | Validated for automotive load-dump (Pulse 2b), supply interruption (Pulse 3a/3b), and coupled noise (Pulse 1/2a) |
| Moisture sensitivity level 1 | Eliminates bake preconditioning requirement prior to reflow; supports standard SMT assembly flow without floor-life constraints |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; suitable for consumer, industrial, and automotive end equipment |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 12 V CAN/LIN bus interface ICs and microcontroller GPIOs against load dump, jump-start surges, and inductive switching spikes. IC Role / Device Role: Primary clamping element placed between protected line and chassis ground, absorbing up to 1500 W transient energy. Use Value: Limits voltage seen by downstream transceivers to ≤16.7 V, preventing latch-up or gate oxide damage during ISO 7637-2 Pulse 2b events. |
Use Scenario: Shields 24 V digital input optocoupler front-end from field-wiring induced transients in factory automation cabinets. IC Role / Device Role: Standoff-rated TVS on each channel input, operating at 10.2 V VWM to avoid false triggering during normal 24 V ±10% operation. Use Value: Delivers <1 µA leakage at rated VWM, ensuring accurate threshold detection and minimizing input loading error. |
| Telecom Power Supply Front-End | Consumer Set-Top Box USB Port |
Use Scenario: Guards AC/DC adapter output stage and DC-DC converter inputs against lightning-induced surges on PoE or wall-adapter lines. IC Role / Device Role: Secondary overvoltage clamp after fuse and common-mode choke; handles repetitive 10/1000 µs pulses per IEC 61000-4-5. Use Value: Maintains 16.7 V clamping at 94 A, limiting stress on downstream MOSFETs and controllers during 1.5 kV line-to-ground surges. |
Use Scenario: Provides ESD immunity on USB D+/D– lines and VBUS against human-body-model (HBM) discharges up to ±15 kV. IC Role / Device Role: Low-capacitance unidirectional TVS placed inline with data lines and power rail; leverages fast <1 ps response. Use Value: Clamps ESD events within nanoseconds while adding <1 pF parasitic capacitance (per Fig.3), preserving USB 2.0 signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A (Bourns) | Same DO-214AA package, 12 V nominal VBR, 16.7 V VC @ 84 A, 600 W PPK | Lower peak power rating reduces suitability for automotive load dump; better fit for low-energy ESD-only use cases | Select SMBJ12A only when surge energy is limited to ≤600 W and PCB space allows DO-214AA footprint |
| 1.5KE12A (ON Semiconductor) | Through-hole DO-15 package, identical 12 V VBR and 16.7 V VC, but 1500 W rating at 25°C with higher RθJA (~65 °C/W) | Requires wave soldering or hand-soldering; unsuitable for fully SMT lines or high-density layouts | Choose 1.5KE12A only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ12A and 1.5KE12A, the 1.5SMC12A offers full 1500 W surge capability in a compact DO-214AB SMT package with superior thermal performance (RθJA = 50 °C/W), making it optimal for high-reliability automotive and industrial applications requiring automated assembly and robust transient immunity.
Availability
1.5SMC12A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and telecom power supply front-ends requiring stable component supply, full RoHS/halogen-free compliance, and ISO 7637-2 validation.
Supply support for 1.5SMC12A 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, with ISO/TS 16949-certified production facilities.
The 1.5SMC series was engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure - emphasizing robustness, automated assembly compatibility, and standardized ISO 7637-2 compliance out-of-the-box.
FAQ
What is the maximum clamping voltage of the 1.5SMC12A under a 10/1000 µs surge?
The 1.5SMC12A has a maximum clamping voltage (VC) of 16.7 V when subjected to its rated peak pulse current of 94 A, defined per the 10/1000 µs waveform in Fig.5. This value is measured at TA = 25°C and ensures downstream components see no more than 16.7 V during standardized surge events - critical for protecting 12 V logic interfaces and power management ICs in the 1.5SMC12A application space.
Is the 1.5SMC12A suitable for bidirectional transient protection?
No, the 1.5SMC12A is a unidirectional TVS diode intended for DC rail protection where polarity is fixed. For bidirectional applications such as AC lines or differential data buses, Taiwan Semiconductor specifies the 1.5SMC12CA variant (with "CA" suffix), which provides symmetrical clamping in both directions. Using the 1.5SMC12A in reverse-biased AC configurations risks permanent breakdown due to its asymmetric structure.
What is the leakage current specification for the 1.5SMC12A at its working stand-off voltage?
The 1.5SMC12A exhibits a maximum blocking leakage current (IR) of 1 µA when biased at its rated working stand-off voltage of 10.2 V, measured at TA = 25°C. This ultra-low leakage supports energy-sensitive applications like battery-backed systems and high-impedance sensor interfaces, where even nanoamp-level currents could affect accuracy or runtime - a verified parameter confirmed in the Electrical Specifications table for 1.5SMC12A.
Does the 1.5SMC12A meet automotive transient immunity standards?
Yes, the 1.5SMC12A is explicitly validated to meet ISO 7637-2 for automotive electrical disturbances, covering Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), and Pulses 3a/3b (capacitive coupling and ignition noise). This compliance is documented in the FEATURES section of the datasheet and confirms its suitability for BCM, infotainment, and ADAS subsystems using the 1.5SMC12A.
What is the thermal resistance from junction to ambient for the 1.5SMC12A in standard mounting conditions?
The 1.5SMC12A has a typical junction-to-ambient thermal resistance (RθJA) of 50 °C/W when mounted on a standard FR-4 PCB with minimum recommended pad layout per the Package Outline Dimensions drawing. This value assumes no additional copper pour or heatsinking; designers must apply derating curves (Fig.2) when ambient temperatures exceed 25°C to maintain safe junction operation within the –55 °C to +150 °C range specified for the 1.5SMC12A.
1.5SMC12A 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):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 94A
- 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)
1.5SMC12A FAQ
1.How can I place an order for 1.5SMC12A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC12A 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 1.5SMC12A reliable?
The price and inventory of 1.5SMC12A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC12A is usually 5 days.
3.What payment methods are accepted for 1.5SMC12A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC12A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC12A?
1.5SMC12A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC12A 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 1.5SMC12A?
For technical support, including 1.5SMC12A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC12A requirements.
6.How does Aetrix verify that 1.5SMC12A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC12A 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 1.5SMC12A meets industry standards.
7.What is the process for return or replacement of 1.5SMC12A?
All 1.5SMC12A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC12A, 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 1.5SMC12A part is unused and in its original packaging.
Return procedure for 1.5SMC12A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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