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Taiwan Semiconductor Corporation 1.5SMC30A
- Part No.:
- 1.5SMC30A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC30A.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,217
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Product details
Overview
1.5SMC30A 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 30V nominal breakdown voltage (28.5–31.5V), 1500W peak pulse power rating, 41.4V maximum clamping voltage at 38A surge current, and DO-214AB (SMC) package. It is used in industrial power supplies to protect switching regulators from load-dump transients.
For engineers reviewing the 1.5SMC30A datasheet, 1.5SMC30A pinout, 1.5SMC30A application, or 1.5SMC30A equivalent, this page delivers verified electrical specs, thermal performance data, clamping behavior under IEC/ISO-compliant surges, and direct alternative part comparisons for ESD and lightning-induced transient suppression.
Technical Context
The 1.5SMC30A operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) and low leakage (<1 µA at 25.6V). Its 150°C maximum junction temperature and 50°C/W junction-to-ambient thermal resistance support reliable operation in high-temperature PCB environments.
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms and is rated for 200A non-repetitive forward surge (IFSM), making it suitable for automotive and industrial load-switching transient suppression where clamping voltage stability and repeatable energy absorption are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 28.5 V / 31.5 V - Ensures reliable avalanche conduction onset within ±5% of nominal 30V rating at 1mA test current |
| VWM | 25.6 V - Maximum continuous reverse operating voltage; defines safe DC bias margin before leakage rises |
| VC @ IPPM | 41.4 V at 38 A - Clamping voltage during 10/1000µs surge; limits protected circuit stress to ≤41.4V |
| PPK | 1500 W - Peak pulse power handling per single 10/1000µs transient; supports high-energy surge immunity |
| IR @ VWM | <1 µA - Ultra-low reverse leakage ensures minimal standby power loss in always-on systems |
| TJ max | +150 °C - Enables use in under-hood automotive or enclosed industrial enclosures without derating |
| RθJA | 50 °C/W - Predictable thermal rise on standard FR-4 PCB; allows accurate junction temp estimation |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, RoHS and halogen-free compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return / ground reference terminal | Connected to system ground or low-side return path; conducts surge current to ground during reverse-biased clamping |
| Cathode | Protected line input terminal | Connected to the line being protected (e.g., +12V rail); blocks normal operation up to 25.6V, avalanches above VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| <1.0 ps response time | Clamps transients before sensitive downstream ICs (e.g., MCU GPIOs or CAN transceivers) experience overvoltage damage |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive battery-line transients including load dump, alternator ripple, and inductive switch-off events |
| DO-214AB mechanical robustness | UL 94V-0 molding compound and JESD201 Class 2 whisker resistance ensure solder joint integrity in automated assembly |
| Unidirectional polarity | Optimized for DC supply rail protection where reverse conduction is not required; lower capacitance than bidirectional variants |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24V DC input stage of programmable logic controller (PLC) power module exposed to relay-coil flyback and field-wiring ESD. IC Role / Device Role / Timing Role: Primary TVS clamp on main DC input rail, placed upstream of DC-DC converter ICs. Use Value: Limits transient overshoot to ≤41.4V, preventing latch-up or gate oxide damage in buck controller ICs rated for 36V absolute max. |
Use Scenario: +12V supply line feeding microcontroller, LIN transceiver, and LED drivers in door module. IC Role / Device Role / Timing Role: Unidirectional surge suppressor on battery feed, coordinated with fuse and LC filter. Use Value: Absorbs ISO 7637-2 Pulse 3b (capacitive discharge) without degradation, maintaining <1µA leakage during sleep mode. |
| Telecom Line Card Interface | Factory Automation Sensor Hub |
Use Scenario: DC power input to PoE-powered remote PHY board subjected to induced surges from adjacent AC wiring. IC Role / Device Role / Timing Role: First-stage overvoltage guard before hot-swap controller and PMIC. Use Value: Clamps 1kV/0.5Ω ring wave to <42V within 1ps, preserving integrity of IEEE 802.3af compliance. |
Use Scenario: 24V auxiliary rail powering analog sensor front-ends (4–20mA transmitters) in dusty, high-noise plant floor environment. IC Role / Device Role / Timing Role: Standoff protector on sensor power bus, paired with local ceramic decoupling. Use Value: Withstands repeated 500A/10ms surges from nearby contactor switching while maintaining VWM = 25.6V for stable bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A (Bourns) | Same DO-214AA (SMB) package; 30V VBR, 600W PPK, 48.4V VC @ 12.3A - lower power rating and higher clamping | Lower energy handling; suited for secondary protection or lower-risk signal lines, not primary 24V rail clamping | Select SMBJ30A only when board space constraints require smaller SMB footprint and surge energy is ≤600W |
| 1.5KE30A (ON Semiconductor) | Through-hole DO-15 package; identical 30V VBR, 1500W PPK, 48.4V VC - same power but 7.5V higher clamping voltage | Requires through-hole assembly; less suitable for high-density SMT layouts or automated placement | Choose 1.5KE30A only for legacy through-hole designs or where thermal mass of axial lead improves sustained surge dissipation |
Compared with 1.5SMC30A, SMBJ30A offers reduced board area but sacrifices 60% peak power and increases clamping by 7V, while 1.5KE30A matches power rating but raises clamping voltage by 7V and requires manual or wave soldering - neither is pin-compatible, and both demand layout or process revalidation.
Availability
1.5SMC30A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom line cards requiring stable component supply, RoHS/halogen-free compliance, and ISO 7637-2 validated surge immunity.
Supply support for 1.5SMC30A 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 global distribution and AEC-Q200-qualified product lines.
The 1.5SMC series was developed for high-reliability surface-mount transient suppression in automotive and industrial environments, emphasizing tight VBR tolerance, low clamping, and robust thermal performance in the DO-214AB package.
FAQ
What is the maximum clamping voltage of the 1.5SMC30A under standard 10/1000µs surge conditions?
The 1.5SMC30A has a maximum clamping voltage (VC) of 41.4 V at 38 A peak pulse current (IPPM) under the standardized 10/1000 µs double-exponential waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits remain below critical overvoltage thresholds during transient events such as load dump or ESD coupling.
Is the 1.5SMC30A suitable for bidirectional transient suppression?
No, the 1.5SMC30A is a unidirectional TVS diode and is not rated for bidirectional operation. For symmetrical surge protection (e.g., data lines or AC-coupled signals), the bidirectional variant 1.5SMC30CA must be used - it features identical VBR and PPK ratings but clamps in both polarities with matched VC values.
What is the working stand-off voltage (VWM) of the 1.5SMC30A, and why does it matter?
The 1.5SMC30A has a working stand-off voltage (VWM) of 25.6 V, meaning it remains in high-impedance blocking state up to this DC or RMS voltage. This 15% margin below nominal 30V VBR prevents premature conduction during normal operation while allowing sufficient headroom for ripple and tolerance drift - critical for stable 24V system protection.
Does the 1.5SMC30A meet automotive transient standards?
Yes, the 1.5SMC30A is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms, covering key automotive transients including battery disconnect (Pulse 1), alternator load dump (Pulse 2a), ignition noise (Pulse 2b), and capacitive coupled spikes (Pulses 3a/3b). Its 1500W rating and 41.4V clamping make it appropriate for BCM and ECU power rail protection.
What is the thermal resistance (RθJA) of the 1.5SMC30A, and how does it affect PCB layout?
The 1.5SMC30A has a typical junction-to-ambient thermal resistance (RθJA) of 50°C/W on standard FR-4 with minimum recommended pad layout. This means a 1.5W steady-state dissipation (e.g., from leakage or minor surges) causes ~75°C junction rise above ambient. To maintain reliability, designers should use ≥25 mm² copper pour connected to both terminals and avoid enclosing the device under shields without thermal relief.
1.5SMC30A 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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 38A
- 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)
1.5SMC30A FAQ
1.How can I place an order for 1.5SMC30A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC30A 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 1.5SMC30A reliable?
The price and inventory of 1.5SMC30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC30A is usually 5 days.
3.What payment methods are accepted for 1.5SMC30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC30A?
1.5SMC30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC30A 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 1.5SMC30A?
For technical support, including 1.5SMC30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC30A requirements.
6.How does Aetrix verify that 1.5SMC30A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC30A 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 1.5SMC30A meets industry standards.
7.What is the process for return or replacement of 1.5SMC30A?
All 1.5SMC30A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC30A, 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 1.5SMC30A part is unused and in its original packaging.
Return procedure for 1.5SMC30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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