My Inquiry
My Account
Taiwan Semiconductor Corporation 1.5SMC51
- Part No.:
- 1.5SMC51
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51.pdf
- Description:
- 1500W, 51V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,446
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5SMC51 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 51V breakdown voltage (45.9–56.1V), 1500W peak pulse power rating, 73.5V maximum clamping voltage at 21A surge current, and DO-214AB (SMC) package. It is used to protect Ethernet PHY interfaces, industrial PLC I/O modules, and automotive body control units against ESD and lightning-induced transients.
For engineers reviewing the 1.5SMC51 datasheet, 1.5SMC51 pinout, 1.5SMC51 application, or 1.5SMC51 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, leakage current at operating voltage, thermal resistance (RθJA = 50°C/W), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b.
Technical Context
The 1.5SMC51 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range. Its glass-passivated junction ensures stable VBR tolerance (±10%) and low leakage (<1µA at 41.3V), enabling reliable hold-off in 48V telecom and industrial control systems.
It delivers sub-nanosecond response (<1.0ps) to fast transients and sustains 1500W peak pulse power per 10/1000µs waveform. Thermal performance is defined by RθJC = 15°C/W and RθJA = 50°C/W, supporting operation up to +150°C junction temperature under proper PCB copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 45.9V / 56.1V - Ensures consistent avalanche initiation across production lots; ±10% tolerance aligns with 48V rail protection margins |
| VWM | 41.3V - Maximum continuous working voltage; safely below 48V nominal supply while allowing headroom for ripple and tolerance |
| VC@IPPM | 73.5V @ 21A - Clamping voltage limits stress on downstream 75V-rated ICs during ISO 7637-2 Pulse 2b events |
| IPPM | 21A - Peak impulse current capacity for 10/1000µs waveform; sufficient for 12V/24V automotive load dump surges |
| PPK | 1500W - Peak pulse power rating defines transient energy absorption capability without failure |
| RθJA | 50°C/W - Junction-to-ambient thermal resistance determines required PCB copper area for sustained 6.5W steady-state dissipation |
| TJ(max) | +150°C - Maximum junction temperature enables use in under-hood automotive and high-temperature industrial enclosures |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-die unidirectional configuration. Cathode indicated by molded band; anode is unmarked end. RoHS-compliant, halogen-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Low-side reference node | Connected to ground or return path; forms current sink during transient clamp event |
| Cathode (banded end) | Protected line input | Connected to line being protected (e.g., 48V supply rail); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term VBR stability and low parameter drift over temperature and life cycle |
| Response time <1.0ps | Clamps ESD events (IEC 61000-4-2) before sensitive logic inputs are overstressed |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive battery-line transients including load dump and inductive switching noise |
| J-STD-020 Level 1 moisture sensitivity | Enables standard SMT reflow without pre-bake; supports high-volume automated assembly |
| UL 94V-0 molding compound | Provides flame-retardant housing essential for industrial and transportation safety certifications |
Applications
| Industrial PLC Analog Input Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protecting 0–10V analog sensor inputs in programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground to shunt transients before reaching precision ADC front-end. Use Value: 73.5V clamping ensures downstream 12-bit SAR ADC (rated to 12V absolute max) remains within safe operating area during 1kV/500Ω IEC 61000-4-4 bursts. |
Use Scenario: Safeguarding 12V/24V power distribution networks in BCMs against load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VBAT feed, positioned upstream of LDO regulators and microcontroller power supplies. Use Value: 1500W peak power rating handles 12V load dump pulses (ISO 7637-2 Pulse 5a) without degradation, maintaining system uptime. |
| Telecom Remote Power Feeding (RPF) | Factory Automation EtherCAT Slave Node |
Use Scenario: Protecting 48V remote power feeding circuits in PoE-like telecom infrastructure equipment. IC Role / Device Role / Timing Role: Standoff diode on DC input side of isolated DC-DC converter, clamping surges before isolation barrier. Use Value: 41.3V VWM allows full utilization of 48V ±10% input range while blocking normal ripple; <1µA leakage minimizes standby power loss. |
Use Scenario: Shielding EtherCAT PHY transceivers and termination resistors from cable discharge events and ground loop transients. IC Role / Device Role / Timing Role: Bidirectional protection (using 1.5SMC51A variant) on differential pairs and VDD lines of slave node PCBs. Use Value: Sub-ns response prevents bit errors during 8kV contact ESD (IEC 61000-4-2), preserving real-time deterministic communication integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same DO-214AA (SMB) package; lower PPK = 600W; VC = 85V @ 7.2A | Lower surge capacity suits cost-sensitive consumer electronics, not automotive or industrial 1500W requirements | Select SMBJ51A only if system-level testing confirms 600W suffices and board space permits smaller SMB footprint |
| 1.5KE51A (ON Semiconductor) | Through-hole DO-15 package; identical electrical specs but incompatible mounting; higher RθJA (~65°C/W) | Requires PCB redesign; unsuitable for high-density SMT layouts or automated assembly lines | Choose 1.5KE51A only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ51A and 1.5KE51A, the 1.5SMC51 provides optimal balance of 1500W surge handling, SMT manufacturability, and thermal performance in compact DO-214AB - making it preferred for new industrial and automotive designs requiring robust, automated-ready protection.
Availability
1.5SMC51 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1.5SMC51 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, and rectifiers, with global distribution and AEC-Q200 qualified product lines.
The 1.5SMC51 belongs to TSC's SMC-series TVS family engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications demanding reliability beyond standard JEDEC ratings.
FAQ
What is the polarity configuration of the 1.5SMC51?
The 1.5SMC51 is a unidirectional TVS diode with cathode indicated by a molded band on the DO-214AB package. It conducts only when reverse voltage exceeds its breakdown range (45.9–56.1V), making it suitable for DC rail protection where polarity is fixed. For bidirectional protection, the 1.5SMC51A variant must be used.
Does the 1.5SMC51 meet automotive transient standards?
Yes, the 1.5SMC51 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical systems. Its 1500W peak pulse power rating and 73.5V clamping voltage enable robust protection against load dump, inductive switching, and battery reversal events in BCM and ECU designs.
What is the maximum steady-state power dissipation for the 1.5SMC51?
The 1.5SMC51 has a steady-state power dissipation (PD) of 6.5W at TA = 25°C. This value derates linearly above 25°C per the pulse derating curve (Fig.2), reaching zero at +150°C junction temperature. Proper PCB copper area is required to maintain thermal performance in continuous operation.
How does the 1.5SMC51 compare to the 1.5SMC51A variant?
The 1.5SMC51A is the bidirectional version of the 1.5SMC51, with symmetric breakdown in both directions (VBR = 48.5–53.6V). The 1.5SMC51 is unidirectional only. Electrical parameters differ slightly: 1.5SMC51A has lower VC (70.1V vs. 73.5V) and higher IPPM (22A vs. 21A), reflecting optimized bidirectional conduction.
Is the 1.5SMC51 compatible with lead-free reflow processes?
Yes, the 1.5SMC51 is RoHS-compliant and halogen-free per IEC 61249-2-21. Its matte tin-plated leads meet J-STD-002 solderability requirements and support standard Pb-free reflow profiles (peak ≤260°C). Moisture sensitivity level is J-STD-020 Level 1, eliminating need for dry pack or baking prior to assembly.
1.5SMC51 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):
- 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)
1.5SMC51 FAQ
1.How can I place an order for 1.5SMC51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51 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 1.5SMC51 reliable?
The price and inventory of 1.5SMC51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51 is usually 5 days.
3.What payment methods are accepted for 1.5SMC51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51?
1.5SMC51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51 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 1.5SMC51?
For technical support, including 1.5SMC51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51 requirements.
6.How does Aetrix verify that 1.5SMC51 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51 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 1.5SMC51 meets industry standards.
7.What is the process for return or replacement of 1.5SMC51?
All 1.5SMC51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51, 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 1.5SMC51 part is unused and in its original packaging.
Return procedure for 1.5SMC51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51 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…
