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Taiwan Semiconductor Corporation 1.5SMC51CH
- Part No.:
- 1.5SMC51CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51CH.pdf
- Description:
- 1500W, 51V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,571
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Product details
Overview
1.5SMC51CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in automotive and industrial power rails. It features a 51V breakdown voltage (min 45.9V, max 56.1V), 1500W peak pulse power rating, 73.5V maximum clamping voltage at 21A, 1μA leakage current at 41.3V working stand-off voltage, and DO-214AB (SMC) package - used to safeguard CAN bus interfaces, 12V/24V DC power inputs, and ECU power supplies against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1.5SMC51CH datasheet, 1.5SMC51CH pinout, 1.5SMC51CH application, or 1.5SMC51CH equivalent, this device delivers AEC-Q101 qualified robustness, sub-1ps response time, and bidirectional clamping capability essential for automotive-grade ESD and load-dump protection in space-constrained SMT designs.
Technical Context
The 1.5SMC51CH implements a glass-passivated silicon junction optimized for fast transient suppression with symmetrical bidirectional conduction. Its thermal design supports 150°C maximum junction temperature and 50°C/W junction-to-ambient resistance, enabling reliable operation under repeated surge stress without thermal runaway.
It meets ISO 7637-2 test requirements for automotive electrical systems including Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnection), Pulse 2b (supply line interruption), and Pulse 3a/3b (capacitive coupling and ignition noise), with clamping performance validated at 10/1000μs waveform per R.E.A. standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 45.9–56.1 V @ 1 mA - defines minimum and maximum voltage at which TVS enters avalanche conduction during surge events |
| Working Stand-off Voltage (VWM) | 41.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; sets safe DC bias margin |
| Maximum Clamping Voltage (VC) | 73.5 V @ 21 A peak pulse - limits voltage seen by downstream circuitry during 10/1000μs surge |
| Peak Pulse Power (PPK) | 1500 W - energy-handling capacity for non-repetitive transients per IEC 61000-4-5 and ISO 7637-2 |
| Junction Temperature Range | −55°C to +150°C - enables deployment in under-hood automotive environments and industrial control cabinets |
| Response Time | <1.0 ps - ensures clamping activation before sensitive ICs experience overvoltage damage |
| Leakage Current (IR) | <1 μA @ 41.3 V - minimizes standby power loss and avoids false triggering in low-power systems |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals). Matte tin-plated leads, RoHS and halogen-free compliant, moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path terminal | No polarity marking required; either terminal serves as input/output for transient energy diversion in both directions |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use including engine control units, body controllers, and infotainment power supplies |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling and humidity stress |
| ISO 7637-2 compliance | Guarantees protection against standardized automotive transients including load dump, supply interruption, and capacitive coupling |
| Sub-1ps response time | Enables clamping before ESD or fast-edge surges propagate into protected ICs such as microcontrollers or CAN transceivers |
| DO-214AB (SMC) footprint | Supports automated placement and reflow soldering; compatible with standard SMT assembly lines and IPC-7351B land patterns |
Applications
| Automotive Power Input Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: 12V battery rail in engine control modules exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS clamps reverse and forward polarity transients to protect LDO regulators and MCU power pins. Use Value: Limits peak voltage to ≤73.5V during 10/1000μs 21A surge, preventing latch-up or permanent damage to 5V/3.3V logic supplies. |
Use Scenario: High-speed CAN FD interface in vehicle networking where ESD and coupled noise threaten signal integrity. IC Role / Device Role / Timing Role: Placed across CAN_H/CAN_L differential pair to shunt common-mode transients while preserving signal rise/fall times. Use Value: Sub-1ps response ensures clamping occurs before edge distortion degrades bit error rate in 5 Mbps CAN FD links. |
| Industrial 24V PLC I/O Protection | Telecom DC Power Feed Protection |
Use Scenario: Digital input module in programmable logic controller subjected to inductive kickback from solenoid switching. IC Role / Device Role / Timing Role: Mounted at connector entry point to absorb repetitive 100–500A surge currents induced by relay coil de-energization. Use Value: 1500W peak power rating sustains >1000 surge events at 8.3ms half-sine without degradation, verified per JESD22-A115. |
Use Scenario: −48V DC power feed in telecom base station equipment vulnerable to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Paired with series impedance to limit let-through energy into DC-DC converters and backplane regulators. Use Value: 73.5V clamping voltage ensures downstream 50V-rated components remain within safe operating area during 10/1000μs 21A transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | 600W rating, SMB package (smaller footprint), lower clamping voltage (71.4V @ 12.3A) | Lower energy handling limits use to lighter-duty telecom or consumer ports; not AEC-Q101 qualified | Select when board space is constrained and surge severity is limited to IEC 61000-4-2/4-4 only |
| 1.5KE51CA | Through-hole TO-204AA (DO-41), 1500W rating, higher thermal mass but no SMT compatibility | Requires manual assembly or wave soldering; unsuitable for automated production or vibration-prone automotive mounts | Select only for prototyping, legacy repair, or non-automated industrial controls where PCB real estate is abundant |
Compared with SMBJ51CA and 1.5KE51CA, the 1.5SMC51CH uniquely combines AEC-Q101 qualification, SMT-ready DO-214AB packaging, and full ISO 7637-2 compliance - making it the only option qualified for production automotive ECUs requiring zero-layout-change integration and repeatable surge immunity.
Availability
1.5SMC51CH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom power feeds requiring stable component supply, AEC-Q101 validation, and high-reliability surge immunity.
Supply support for 1.5SMC51CH 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, MOSFETs, and automotive-qualified components.
The 1.5SMCxxCH series was developed specifically for AEC-Q101-compliant bidirectional surge protection in automotive power distribution networks and industrial control systems demanding high pulse power density in compact SMT packages.
FAQ
What is the polarity configuration of the 1.5SMC51CH?
The 1.5SMC51CH is a bidirectional TVS diode with symmetrical terminals - neither anode nor cathode is designated, and no polarity marking is present on the DO-214AB package. This allows it to clamp transients of either polarity across protected lines such as CAN_H/CAN_L or ±12V rails without orientation constraints during placement.
Does the 1.5SMC51CH meet automotive qualification standards?
Yes, the 1.5SMC51CH is AEC-Q101 qualified and explicitly tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its construction - glass-passivated junction, matte tin terminations, and DO-214AB molding compound rated UL 94V-0 - satisfies all mechanical, thermal, and electrical stress criteria for under-hood and chassis-mounted automotive applications.
What is the maximum clamping voltage of the 1.5SMC51CH and at what current is it specified?
The 1.5SMC51CH has a maximum clamping voltage (VC) of 73.5 V, measured at a peak impulse current (IPPM) of 21 A using the standard 10/1000μs double-exponential waveform defined in R.E.A. and IEC 61000-4-5. This value ensures downstream 5V or 3.3V logic remains within absolute maximum ratings during surge events.
How does the 1.5SMC51CH differ from the unidirectional 1.5SMC51H variant?
The 1.5SMC51CH is bidirectional and lacks a cathode band, enabling symmetrical clamping in both directions; the 1.5SMC51H is unidirectional with a marked cathode band and is rated for forward surge only. The 1.5SMC51CH also exhibits identical VBR, VWM, and VC in both polarities, whereas the 1.5SMC51H has separate forward voltage (VF = 3.5 V @ 50 A) and reverse blocking specs.
What is the thermal resistance profile of the 1.5SMC51CH and how does it affect layout design?
The 1.5SMC51CH 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 1500W surge conditions, PCB copper area must provide ≥10 cm² of 2-oz copper pour connected to both terminals - verified per JEDEC JESD51-2 and JESD51-5 standards for DO-214AB packages.
1.5SMC51CH 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC51CH FAQ
1.How can I place an order for 1.5SMC51CH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51CH 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 1.5SMC51CH reliable?
The price and inventory of 1.5SMC51CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51CH is usually 5 days.
3.What payment methods are accepted for 1.5SMC51CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51CH?
1.5SMC51CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51CH 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 1.5SMC51CH?
For technical support, including 1.5SMC51CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51CH requirements.
6.How does Aetrix verify that 1.5SMC51CH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51CH 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 1.5SMC51CH meets industry standards.
7.What is the process for return or replacement of 1.5SMC51CH?
All 1.5SMC51CH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51CH, 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 1.5SMC51CH part is unused and in its original packaging.
Return procedure for 1.5SMC51CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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