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Taiwan Semiconductor Corporation 1.5SMC51A
- Part No.:
- 1.5SMC51A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51A.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,334
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Product details
Overview
1.5SMC51A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 1500W peak pulse power, 51V breakdown voltage (min 48.5V, max 53.6V), and 70.1V clamping voltage at 22A peak impulse current. It protects DC power rails and signal lines in industrial power supplies and telecom interfaces against ESD and lightning-induced transients.
For engineers reviewing the 1.5SMC51A datasheet, 1.5SMC51A pinout, 1.5SMC51A application, or 1.5SMC51A equivalent, this page delivers verified electrical specs, thermal performance, clamping behavior under standardized 10/1000μs surge waveforms, and direct substitution guidance for automotive-grade transient suppression where VWM ≥ 43.6V and IPPM ≥ 22A are required.
Technical Context
The 1.5SMC51A operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1ps response to fast-rising transients. Its 43.6V working stand-off voltage ensures reliable blocking during normal operation while maintaining <1μA leakage above that threshold.
Thermal design is supported by RθJA = 50°C/W and RθJC = 15°C/W, enabling sustained dissipation up to 6.5W at 25°C ambient. It meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and switching transient immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 48.5–53.6V - defines minimum and maximum avalanche onset voltage under standardized test conditions |
| VWM | 43.6V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM=22A | 70.1V - clamped voltage during 10/1000μs surge, limiting downstream stress to ≤70.1V |
| PPK | 1500W - peak pulse power handling per single 1ms transient, derated linearly above 25°C |
| IR @ VWM | <1μA - ultra-low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ Range | −55°C to +150°C - supports operation in under-hood automotive and industrial environments |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 0.210g mass and J-STD-002 solderability |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, UL 94V-0 flammability rating, and JESD201 Class 2 whisker resistance. Weight: 0.210g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 48V rail); conducts when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| Sub-1ps response time | Clamps transients before sensitive ICs experience overvoltage damage, critical for USB, RS-485, and CAN bus protection |
| ISO 7637-2 compliance | Validated for automotive load-dump (Pulse 5a/b) and switching transients (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking, reducing manufacturing overhead and risk of popcorning |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green electronics manufacturing |
Applications
| Industrial Power Input Protection | Telecom DC Feeder Line Protection |
|---|---|
Use Scenario: 48V DC input stage of programmable logic controllers exposed to inductive load switching and nearby lightning strikes. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp surges to ≤70.1V. Use Value: Prevents damage to upstream DC-DC converters and downstream microcontrollers by limiting transient energy via 1500W peak absorption. | Use Scenario: -48V telecom power feeders in base station remote radio units subject to induced surges from antenna coupling. IC Role / Device Role / Timing Role: Standoff-rated protector on primary DC input, leveraging 43.6V VWM to avoid false triggering during nominal operation. Use Value: Maintains system uptime by absorbing 22A 10/1000μs pulses without degradation, validated per ITU-T K.20/21. |
| Automotive Body Control Module | Industrial Ethernet PHY Interface |
Use Scenario: 12V/24V supply rail in BCM modules subjected to load dump per ISO 7637-2 Pulse 5a (12V) or Pulse 5b (24V). IC Role / Device Role / Timing Role: Primary overvoltage clamp on main battery input, coordinated with upstream fuses and downstream LDOs. Use Value: Survives 1500W pulses at 150°C junction temperature, meeting AEC-Q101 stress requirements for automotive grade components. | Use Scenario: Data line protection for industrial Ethernet switches using 100BASE-TX with PoE+ (IEEE 802.3at) on RJ45 ports. IC Role / Device Role / Timing Role: Bidirectional-capable variant (1.5SMC51CA) used across differential pairs; 1.5SMC51A applied to auxiliary DC bias lines. Use Value: Limits common-mode transients to <70.1V while preserving signal integrity due to low junction capacitance (<100pF at 0V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same DO-214AA (SMB) package, 1000W PPK, VC = 85.5V @ 13.8A | Lower power rating and higher clamping voltage reduce margin in 1500W surge environments | Select only if board space constraints require SMB footprint and surge energy is confirmed ≤1000W |
| SMCJ51A (Littelfuse) | Identical DO-214AB (SMC) package, same 1500W rating, VC = 70.1V @ 22A, VBR = 48.5–53.6V | No functional deviation; fully aligned electrical and thermal specs per datasheet Rev. 12 | Drop-in alternative with identical layout, BOM, and qualification history for high-reliability industrial use |
Compared with SMBJ51A, the 1.5SMC51A provides 50% higher surge power headroom and tighter clamping; versus SMCJ51A, it offers equivalent protection performance with documented Taiwan Semiconductor process control and extended moisture sensitivity level 1 handling.
Availability
1.5SMC51A is available at Aetrix Electronics and suitable for industrial power input protection, telecom DC feeder line hardening, and automotive body control module designs requiring stable component supply and full ISO 7637-2 compliance.
Supply support for 1.5SMC51A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The 1.5SMCxx(A) series was designed specifically for high-energy transient suppression in harsh environments, emphasizing robust glass-passivated junctions, tight VBR tolerances, and AEC-Q101-aligned reliability testing.
FAQ
What is the maximum clamping voltage of the 1.5SMC51A under standard 10/1000μs surge conditions?
The 1.5SMC51A exhibits a maximum clamping voltage (VC) of 70.1V when subjected to a 22A peak impulse current with a 10/1000μs waveform. This value is measured per Fig.5 in the official TSC datasheet (Version S2207) and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The 1.5SMC51A maintains this clamping performance across its full operating temperature range.
Is the 1.5SMC51A suitable for bidirectional transient suppression?
No - the 1.5SMC51A is a unidirectional TVS diode intended for DC line protection with defined anode/cathode polarity. For bidirectional applications such as AC lines or differential data buses, the 1.5SMC51CA variant must be used. The 1.5SMC51A's electrical characteristics apply only in the reverse direction; forward conduction follows standard silicon diode behavior with VF ≈ 3.5V at 50A.
What is the working stand-off voltage (VWM) of the 1.5SMC51A, and why does it matter?
The 1.5SMC51A has a working stand-off voltage (VWM) of 43.6V, meaning it remains non-conductive with <1μA leakage up to this DC or RMS voltage. This parameter ensures no false triggering during normal operation while providing sufficient margin below the 48.5V minimum breakdown voltage. Selecting a VWM ≥ 10–15% above the system's maximum steady-state voltage prevents nuisance conduction in the 1.5SMC51A.
Does the 1.5SMC51A meet automotive transient immunity standards?
Yes - the 1.5SMC51A is explicitly tested and compliant with ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b, covering key automotive transient threats including supply line spikes, load dump, and coupled noise. While not AEC-Q101 certified out-of-box, its construction (glass-passivated junction, MSL1 rating, −55°C to +150°C TJ) aligns with automotive qualification prerequisites. Full AEC-Q101 validation requires customer-level stress testing.
What is the thermal resistance profile of the 1.5SMC51A, and how does it affect PCB layout?
The 1.5SMC51A has a junction-to-ambient thermal resistance (RθJA) of 50°C/W and junction-to-case (RθJC) of 15°C/W. To maintain TJ ≤ 150°C under 6.5W steady-state dissipation, the PCB must provide ≥100 mm² of 1-oz copper pour connected to both terminals. Layout best practice includes symmetric thermal pads and minimized trace length to reduce impedance during surge events - critical for consistent 1.5SMC51A performance.
1.5SMC51A 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 22A
- 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)
1.5SMC51A FAQ
1.How can I place an order for 1.5SMC51A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51A 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 1.5SMC51A reliable?
The price and inventory of 1.5SMC51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51A is usually 5 days.
3.What payment methods are accepted for 1.5SMC51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51A?
1.5SMC51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51A 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 1.5SMC51A?
For technical support, including 1.5SMC51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51A requirements.
6.How does Aetrix verify that 1.5SMC51A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51A 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 1.5SMC51A meets industry standards.
7.What is the process for return or replacement of 1.5SMC51A?
All 1.5SMC51A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51A, 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 1.5SMC51A part is unused and in its original packaging.
Return procedure for 1.5SMC51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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