My Inquiry
My Account
Taiwan Semiconductor Corporation 1.5SMC51H
- Part No.:
- 1.5SMC51H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51H.pdf
- Description:
- 1500W, 51V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,203
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5SMC51H 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 51 V breakdown voltage (45.9–56.1 V), 1500 W peak pulse power rating, 73.5 V maximum clamping voltage at 21 A, and DO-214AB (SMC) package - used in automotive body control modules to protect CAN transceivers from ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1.5SMC51H datasheet, 1.5SMC51H pinout, 1.5SMC51H application, or 1.5SMC51H equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, leakage current at system operating voltage, thermal derating above 25°C ambient, and compliance with AEC-Q101 stress testing for automotive deployment.
Technical Context
The 1.5SMC51H operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified breakdown range (45.9–56.1 V at 1 mA test current). Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA at 41.3 V working stand-off voltage).
It delivers fast transient response (<1.0 ps), meets ISO 7637-2 immunity requirements for automotive load-dump and inductive-switching surges, and sustains 1500 W peak pulse power (10/1000 µs waveform) with 73.5 V clamping at 21 A - enabling robust protection of 48 V and 36 V automotive subsystems without crowbar action.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 45.9 V / 56.1 V - defines minimum trigger threshold and worst-case upper limit for reliable surge initiation across temperature and unit variation |
| VWM | 41.3 V - maximum continuous reverse operating voltage; must exceed system nominal rail (e.g., 36 V or 48 V bus) to prevent leakage-induced power loss |
| VC@IPPM | 73.5 V - clamping voltage at 21 A peak impulse; determines maximum stress imposed on downstream ICs during transient events |
| PPK | 1500 W - peak pulse power handling (10/1000 µs); sets survivability against high-energy transients like ISO 7637-2 Pulse 5a |
| IPPM | 21 A - maximum non-repetitive peak current; used with VC to calculate worst-case power dissipation during surge |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood environments with minimal thermal derating |
| RθJA | 50 °C/W - junction-to-ambient thermal resistance; informs PCB copper area and airflow requirements for sustained power dissipation |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Standardized 2-terminal device: Anode (unmarked end) and Cathode (banded end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge or ESD events in bidirectional configurations (not applicable to 1.5SMC51H) |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., CAN_H or 48 V rail); avalanches into low-impedance state when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD-HBM/MM per JESD47 - required for under-hood and chassis-mounted ECUs |
| Glass passivated junction | Ensures stable VBR tolerance (±5% typical), low leakage (<1 µA @ VWM), and long-term parameter stability under thermal cycling |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation |
| Fast response time | <1.0 ps - limits voltage overshoot before clamping engages, critical for protecting high-speed interfaces like CAN FD or LIN |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow - simplifies SMT assembly and reduces manufacturing cost |
Applications
| Automotive Body Control Module (BCM) | Industrial 48 V DC Power Distribution |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load-dump transients during battery disconnect/reconnect events in door modules and seat controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on LIN data line and 5 V/3.3 V supply rails, absorbing energy from ISO 7637-2 Pulse 2a (50 V, 2 Ω source) and Pulse 5a (75 V, 10 Ω source). Use Value: Limits voltage seen by transceiver to ≤73.5 V, well below its 80 V absolute maximum rating, preventing latch-up or permanent damage during repeated surge exposure. | Use Scenario: Safeguarding programmable logic controller (PLC) analog input channels connected to 4–20 mA sensors exposed to field wiring transients. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), clamping induced surges from lightning-induced coupling or motor drive switching noise on 48 V auxiliary rails. Use Value: Delivers 1500 W peak power handling with 73.5 V clamping, ensuring sensor front-end ICs remain within safe operating area during 10/1000 µs surges up to 21 A. |
| Telecom Remote Radio Unit (RRU) Power Input | Medical Infusion Pump Motor Driver |
Use Scenario: Shielding 48 V DC input of outdoor base station RRUs from induced surges due to nearby lightning strikes or AC mains coupling. IC Role / Device Role / Timing Role: First-line TVS on main DC input, placed upstream of DC-DC converters and PMICs to prevent catastrophic failure from high-energy transients. Use Value: Withstands 1500 W pulses while maintaining <1 µA leakage at 41.3 V, minimizing standby power loss in always-on telecom infrastructure. | Use Scenario: Protecting H-bridge gate drivers and current-sense amplifiers in battery-powered infusion pumps subjected to ESD events during clinical handling. IC Role / Device Role / Timing Role: Localized clamping on motor supply and feedback paths, suppressing sub-nanosecond ESD discharges per IEC 61000-4-2 Level 4 (15 kV air, 8 kV contact). Use Value: Sub-1 ps response time prevents voltage overshoot beyond 73.5 V, preserving functional safety integrity of motor control loop during human-contact ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | Same 51 V breakdown range but 600 W PPK, DO-214AA (SMB) package, 10% lower clamping voltage (70 V) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a in automotive 48 V systems | Select only where space constraints prohibit SMC footprint and surge energy is capped at 600 W |
| 1.5KE51A | Through-hole TO-204AA (DO-41), 1500 W rating, higher VC (84.5 V), slower thermal response | Requires manual or wave soldering; incompatible with automated SMT lines and high-density PCB layouts | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ51A and 1.5KE51A, the 1.5SMC51H uniquely combines AEC-Q101 qualification, 1500 W capability in an SMT-optimized DO-214AB package, and ISO 7637-2 compliance - making it the preferred choice for production automotive and industrial 48 V systems requiring zero layout change and full automotive reliability.
Availability
1.5SMC51H is available at Aetrix Electronics and suitable for automotive body electronics, industrial 48 V power distribution, and telecom remote radio units requiring stable component supply, AEC-Q101 compliance, and high-energy transient immunity.
Supply support for 1.5SMC51H 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-Q101-certified production lines.
The 1.5SMCxxH series was engineered specifically for surface-mount automotive and industrial transient suppression, emphasizing high PPK, low clamping ratio, and robust thermal performance in the DO-214AB package.
FAQ
What is the breakdown voltage range of the 1.5SMC51H?
The 1.5SMC51H has a guaranteed breakdown voltage range of 45.9 V to 56.1 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range reflects manufacturing tolerance and ensures reliable triggering across temperature and unit variation. The 1.5SMC51H maintains this specification under AEC-Q101 stress conditions, confirming stability in automotive environments.
Is the 1.5SMC51H suitable for bidirectional transient protection?
No - the 1.5SMC51H is a unidirectional TVS diode intended for DC rail protection with defined polarity. For bidirectional applications such as AC lines or differential buses, Taiwan Semiconductor offers the 1.5SMC51AH variant (with CAH suffix), which provides symmetrical clamping in both directions. The 1.5SMC51H must be installed with correct cathode orientation relative to the protected line.
What is the maximum clamping voltage of the 1.5SMC51H at its rated peak current?
The 1.5SMC51H clamps to a maximum of 73.5 V at 21 A peak pulse current (10/1000 µs waveform), as specified in the Electrical Specifications table. This value is critical for determining whether downstream ICs remain within their absolute maximum voltage ratings during surge events. The 1.5SMC51H achieves this with a clamping ratio (VC/VBR) of ~1.38, indicating efficient energy diversion.
Does the 1.5SMC51H meet automotive qualification standards?
Yes - the 1.5SMC51H is explicitly AEC-Q101 qualified and tested per the full stress sequence including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing. It also meets ISO 7637-2 for automotive transient immunity (Pulse 1, 2a, 2b, 3a, 3b), making it suitable for under-hood and chassis-mounted electronic control units per the 1.5SMC51H datasheet.
What is the thermal resistance of the 1.5SMC51H, and how does it affect PCB layout?
The 1.5SMC51H has a junction-to-ambient thermal resistance (RθJA) of 50 °C/W under standard JEDEC conditions. This means that for every watt of average power dissipated, the junction temperature rises 50 °C above ambient. To maintain TJ ≤150 °C in a 85 °C ambient environment, PCB layout must provide ≥1 cm² of 2-oz copper pour connected to both terminals, as confirmed in the 1.5SMC51H thermal performance section.
1.5SMC51H 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC51H FAQ
1.How can I place an order for 1.5SMC51H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51H 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 1.5SMC51H reliable?
The price and inventory of 1.5SMC51H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51H is usually 5 days.
3.What payment methods are accepted for 1.5SMC51H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51H?
1.5SMC51H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51H 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 1.5SMC51H?
For technical support, including 1.5SMC51H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51H requirements.
6.How does Aetrix verify that 1.5SMC51H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51H 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 1.5SMC51H meets industry standards.
7.What is the process for return or replacement of 1.5SMC51H?
All 1.5SMC51H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51H, 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 1.5SMC51H part is unused and in its original packaging.
Return procedure for 1.5SMC51H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51H 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…
