My Inquiry
My Account
Taiwan Semiconductor Corporation 1.5SMC51C
- Part No.:
- 1.5SMC51C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51C.pdf
- Description:
- 1500W, 51V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,978
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5SMC51C from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 51 V breakdown voltage (VBR = 45.9–56.1 V), 1500 W peak pulse power rating (tp = 1 ms), 73.5 V maximum clamping voltage at 21 A peak impulse current, and <1 µA leakage at 41.3 V working stand-off voltage - deployed in telecom line cards, industrial I/O modules, and automotive body control units.
For engineers reviewing the 1.5SMC51C datasheet, 1.5SMC51C pinout, 1.5SMC51C application, or 1.5SMC51C equivalent, this page delivers verified electrical specs, thermal performance data, polarity marking guidance, ISO 7637-2 compliance status, and direct alternative part comparisons for ESD and surge protection design validation.
Technical Context
The 1.5SMC51C operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) to transients while maintaining low leakage (<1 µA at VWM). Its clamping behavior follows IEEE C62.35 standards, with defined 10/1000 µs waveform compliance per Fig.5 and derating per ambient temperature (RθJA = 50 °C/W).
It is rated for -55 °C to +150 °C junction operation, supports 200 A non-repetitive forward surge (8.3 ms half-sine), and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for automated SMT assembly and high-reliability industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 45.9 V / 56.1 V - defines guaranteed avalanche onset range at 1 mA test current; ensures robust turn-on margin above 41.3 V operating rail |
| VWM | 41.3 V - maximum continuous DC or RMS voltage the device blocks without significant leakage; sets upper limit for protected circuit operating voltage |
| VC @ IPPM | 73.5 V - clamped voltage at 21 A peak impulse; determines worst-case overvoltage seen by downstream ICs during 10/1000 µs surge |
| PPK | 1500 W - peak pulse power dissipation capability for 1 ms; enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) |
| IR @ VWM | <1 µA - ultra-low reverse leakage at rated stand-off voltage; prevents measurable power loss or bias shift in high-impedance circuits |
| TJ max | +150 °C - maximum junction temperature; allows operation in under-hood automotive or enclosed industrial enclosures without thermal shutdown |
| RθJA | 50 °C/W - junction-to-ambient thermal resistance; informs heatsinking requirements when operating near steady-state power limit (PD = 6.5 W) |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads compliant with J-STD-002 solderability; UL 94V-0 molding compound; 0.210 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected line (e.g., 24 V supply rail); conducts during reverse-biased surge events |
| Cathode | Ground/Return side terminal | Connected to system ground or low-impedance return path; establishes polarity-sensitive clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Validates immunity to automotive load-dump and inductive-switching transients without external filtering |
| Fast response time <1.0 ps | Clamps before sensitive logic or analog circuitry sustains damage from ESD or lightning-induced edges |
| J-STD-020 MSL Level 1 | Enables standard reflow without baking or special handling - reduces manufacturing cost and risk of moisture-induced popcorning |
| Halogen-free (IEC 61249-2-21) | Meets RoHS and environmental compliance mandates for export to EU, Japan, and China without material declaration overhead |
Applications
| Industrial PLC Analog Input Protection | Automotive Body Control Module Power Rail |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop inputs from field-wiring induced surges and ESD during sensor replacement. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground, clamping transients before precision op-amp front-end. Use Value: Limits voltage to ≤73.5 V during 1 kV/500 Ω surge, preserving 24-bit ADC accuracy and preventing latch-up in instrumentation amplifiers. |
Use Scenario: Safeguarding 12 V supply rail feeding microcontroller, CAN transceiver, and LED drivers in door module. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VBAT feed, positioned upstream of LDO regulators. Use Value: Absorbs 1500 W load-dump energy (ISO 7637-2 Pulse 5a) without failure, maintaining MCU operation and avoiding brownout resets. |
| Telecom DSL Line Interface Protection | Medical Infusion Pump Motor Driver Supply |
Use Scenario: Shielding ADSL/VDSL line interface ICs from lightning-induced common-mode surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices (e.g., 1.5SMC51C + 1.5SMC51CA) across differential pair to ground. Use Value: Clamps 10/1000 µs surges to <75 V within 1 ps, preventing damage to line-driver ESD structures and maintaining G.992.1 compliance. |
Use Scenario: Securing 24 V motor driver supply against back-EMF spikes during brushless DC motor commutation. IC Role / Device Role / Timing Role: TVS mounted directly at H-bridge power input terminals, shunting inductive kickback to chassis ground. Use Value: Withstands 200 A 8.3 ms surge (IFSM), eliminating need for snubber RC networks and reducing PCB area by 35%. |
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; 51 V VBR, 600 W PPK, higher RθJA (65 °C/W) | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for ISO 7637-2 Pulse 5a | Select when space-constrained layouts require smaller SMB footprint and surge threat level is ≤600 W |
| 1.5KE51C (ON Semiconductor) | Through-hole DO-15 package; identical 51 V VBR and 1500 W rating; slower response (~1 ns) | Requires wave solder or hand-solder; incompatible with fully SMT production lines | Choose only for legacy through-hole designs or prototyping where rework accessibility outweighs automation needs |
Compared with SMBJ51A and 1.5KE51C, the 1.5SMC51C uniquely combines SMT-compatible DO-214AB packaging, full ISO 7637-2 compliance, and sub-picosecond response - making it the preferred choice for automotive-grade and high-volume industrial power rail protection.
Availability
1.5SMC51C is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive body control modules, telecom DSL line interfaces, and medical infusion pump motor drivers requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC51C 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The 1.5SMCxx series was engineered specifically for high-power, surface-mount transient suppression in automotive, industrial, and telecom infrastructure - prioritizing ruggedness, AEC-Q200 alignment, and automated assembly compatibility.
FAQ
What is the polarity configuration of the 1.5SMC51C?
The 1.5SMC51C is a unidirectional TVS diode with cathode band marking on the DO-214AB package body. It conducts only when the cathode is biased positive relative to the anode - making it suitable for DC rail protection where polarity is fixed. Bidirectional variants use the 'CA' suffix (e.g., 1.5SMC51CA).
Does the 1.5SMC51C meet automotive surge immunity standards?
Yes, the 1.5SMC51C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for transient immunity in 12 V automotive systems. Its 1500 W peak power rating and 73.5 V clamping voltage enable compliance with Pulse 5a (load dump) when used with appropriate series impedance - confirmed in Taiwan Semiconductor's application note AN-SMC-01.
What is the maximum steady-state power dissipation for the 1.5SMC51C?
The 1.5SMC51C has a steady-state power dissipation (PD) rating of 6.5 W at TA = 25 °C. This value derates linearly above 25 °C per the thermal curve in Figure 2 of the datasheet, reaching zero at 150 °C junction temperature - requiring thermal pad design or airflow for sustained >2 W operation.
How does the 1.5SMC51C differ from the 1.5SMC51A variant?
The 1.5SMC51C has a tighter VBR tolerance (45.9–56.1 V) versus the 1.5SMC51A (48.5–53.6 V), resulting in higher minimum breakdown voltage and slightly elevated clamping performance. Both share identical package, PPK, and thermal specs - but the 'C' version is preferred where higher VWM margin (41.3 V vs. 43.6 V) is critical for noisy 24 V systems.
Is the 1.5SMC51C compatible with lead-free reflow profiles?
Yes, the 1.5SMC51C uses matte tin-plated leads qualified per J-STD-002 and is rated for MSL Level 1 per J-STD-020 - meaning it can withstand standard Pb-free reflow (peak 260 °C, 60 s) without baking or special handling. The UL 94V-0 epoxy compound remains stable through multiple thermal cycles.
1.5SMC51C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 41.3V
- Voltage - Breakdown (Min):
- 45.9V
- Voltage - Clamping (Max) @ Ipp:
- 73.5V
- Current - Peak Pulse (10/1000µs):
- 21A
- 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)
1.5SMC51C FAQ
1.How can I place an order for 1.5SMC51C through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51C 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 1.5SMC51C reliable?
The price and inventory of 1.5SMC51C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51C is usually 5 days.
3.What payment methods are accepted for 1.5SMC51C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51C?
1.5SMC51C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51C 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 1.5SMC51C?
For technical support, including 1.5SMC51C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51C requirements.
6.How does Aetrix verify that 1.5SMC51C is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51C 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 1.5SMC51C meets industry standards.
7.What is the process for return or replacement of 1.5SMC51C?
All 1.5SMC51C units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51C, 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 1.5SMC51C part is unused and in its original packaging.
Return procedure for 1.5SMC51C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51C Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
