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Taiwan Semiconductor Corporation 1.5SMC51CA
- Part No.:
- 1.5SMC51CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51CA.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,432
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Product details
Overview
1.5SMC51CA from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 51V, clamping voltage of 70.1V at 22A peak pulse current, and working stand-off voltage of 43.6V. It features glass-passivated junction, <1.0ps response time, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection in DC power rails.
For engineers reviewing the 1.5SMC51CA datasheet, 1.5SMC51CA pinout, 1.5SMC51CA application, or 1.5SMC51CA equivalent, this TVS diode is selected for robust overvoltage immunity in telecom power interfaces, industrial I/O modules, and automotive body control units where bidirectional surge suppression and low leakage (<1µA at 43.6V) are critical.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical electrical characteristics forward and reverse - enabling single-device protection of AC-coupled or floating signal lines and ungrounded DC buses. Its DO-214AB (SMC) package delivers 50°C/W junction-to-ambient thermal resistance and supports automated SMT placement with matte tin-plated leads compliant to J-STD-002.
The device achieves fast transient response via a low-capacitance silicon junction (typical CJ < 100pF at 0V), maintains stable VBR with ±0.102%/°C temperature coefficient, and sustains 1500W peak pulse power per 10/1000μs waveform while limiting clamped voltage to ≤70.1V under 22A surge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5V / 53.6V - Ensures reliable triggering above system operating voltage (e.g., 42V automotive nominal) while avoiding false trips. |
| VWM | 43.6V - Maximum continuous DC or RMS voltage the device blocks without significant leakage (<1µA). |
| VC @ IPPM | 70.1V at 22A - Clamped voltage during 10/1000μs surge; defines maximum stress imposed on downstream circuitry. |
| PPK | 1500W - Peak pulse power handling per standard 10/1000μs waveform; enables protection against severe transients like ISO 7637-2 Pulse 5a. |
| IPPM | 22A - Maximum non-repetitive peak current the device safely clamps without degradation. |
| TJ max | +150°C - Allows operation in high-temperature environments such as engine compartments or enclosed industrial enclosures. |
| Package | DO-214AB (SMC) - Surface-mount outline with 7.11mm × 6.22mm footprint and 2.62mm height; compatible with IPC-7351B SMC standard land pattern. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with cathode band marking; bidirectional symmetry means both terminals are functionally identical - no polarity-dependent pin assignment. Leads are matte tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | Both terminals serve as interchangeable surge current entry/exit points; no DC polarity requirement - ideal for AC line or floating bus protection. |
| Cathode band (marking) | Manufacturing orientation indicator | Present for traceability only; has no functional role in bidirectional operation - device performs identically regardless of band orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for dual unidirectional devices in differential or AC-coupled circuits. |
| Ultra-fast response | <1.0ps junction response time - limits voltage overshoot before clamping engages, critical for protecting fast-switching MOSFET gates and microcontroller I/O. |
| Low leakage current | <1µA at 43.6V - prevents excessive quiescent power loss in battery-backed or energy-sensitive systems (e.g., remote sensors). |
| Automated placement ready | DO-214AB (SMC) package with J-STD-002-compliant terminations - supports high-yield, high-speed pick-and-place without lead deformation or solder bridging. |
| Automotive-grade compliance | Meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, 3b - validated for real-world vehicle electrical disturbances including load dump, jump start, and inductive switching noise. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protects 12V/24V supply inputs and LIN/CAN node power rails from load-dump transients and alternator ripple spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to clamp surges before reaching LDOs, microcontrollers, and transceivers. Use Value: Limits clamped voltage to 70.1V - well below 80V absolute maximum ratings of common automotive PMICs and CAN transceivers, preventing latch-up or permanent damage. |
Use Scenario: Shields 24V DC digital input channels from field-wiring induced surges (e.g., relay coil flyback, lightning-induced coupling). IC Role / Device Role / Timing Role: Primary overvoltage clamp on optocoupler input side, placed upstream of series current-limiting resistor. Use Value: With 1µA leakage at 43.6V, it avoids false triggering of 24V logic thresholds while delivering 22A surge current capacity to absorb >1kV/1Ω ring wave events. |
| Telecom Power Feeding Interface | Medical Diagnostic Equipment Power Entry |
Use Scenario: Guards PoE-powered device front-end (e.g., IP camera, wireless AP) against Ethernet cable ESD and power feed transients. IC Role / Device Role / Timing Role: Bidirectional TVS across +VPOE and return, complementing common-mode chokes and inline fuses. Use Value: Symmetric 48.5–53.6V VBR aligns precisely with IEEE 802.3af/at 44–57V operational range, ensuring clamping initiates only during fault conditions - not during normal power-up or brownout. |
Use Scenario: Safeguards isolated 24V/48V auxiliary power inputs in ultrasound or MRI subsystems against facility-level surges and ESD from operator touch. IC Role / Device Role / Timing Role: Final-stage transient suppressor mounted at board edge, downstream of EMI filter but upstream of DC-DC converters. Use Value: 1500W peak power rating and 70.1V clamping enable compliance with IEC 61000-4-5 Level 4 (4kV line-earth) without derating or parallel staging. |
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 (Bourns) | Same DO-214AA (SMB) package; lower PPK = 600W; VC = 84.5V @ 7.1A; higher clamping voltage and lower surge capacity. | Not suitable for ISO 7637-2 Pulse 5a (load dump); limited to lower-energy transients like IEC 61000-4-2 ESD or basic EFT. | Select SMBJ51CA only when space constraints require smaller SMB footprint and surge requirements are ≤600W. |
| SMCJ51CA (Littelfuse) | Same DO-214AB (SMC) package; identical PPK = 1500W; VBR = 48.5–53.6V; VC = 70.1V @ 22A - matches 1.5SMC51CA within datasheet tolerance bands. | Functionally interchangeable in all bidirectional 1500W TVS applications; RoHS/halogen-free compliance and moisture sensitivity level (MSL 1) identical. | SMCJ51CA is a direct form-fit-function alternative with verified second-source availability for long-term BOM continuity. |
Compared with SMBJ51CA, the 1.5SMC51CA delivers 2.5× higher surge energy handling and tighter clamping; versus SMCJ51CA, it offers equivalent protection performance with identical mechanical fit and qualification - making it optimal for automotive and industrial designs requiring guaranteed 1500W immunity.
Availability
1.5SMC51CA is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and telecom infrastructure equipment requiring stable component supply and full ISO 7637-2 compliance.
Supply support for 1.5SMC51CA 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 power management components.
The 1.5SMCxx(A) series was engineered specifically for high-reliability surface-mount surge protection in harsh environments - emphasizing automotive-grade transient immunity, automated assembly compatibility, and MSL-1 moisture robustness.
FAQ
What does the 'CA' suffix indicate in 1.5SMC51CA?
The 'CA' suffix in 1.5SMC51CA denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both forward and reverse directions, with identical breakdown and clamping characteristics across its terminals. This differs from unidirectional variants (e.g., 1.5SMC51A), which require correct polarity orientation. The 1.5SMC51CA is designed for use on floating or AC-coupled lines where polarity cannot be guaranteed.
Does 1.5SMC51CA meet automotive transient standards?
Yes, the 1.5SMC51CA meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - covering key automotive electrical disturbances including battery disconnect, load dump simulation, and inductive switching noise. Its 1500W peak pulse rating and 70.1V clamping voltage ensure robust protection for 12V and 24V vehicle networks, as confirmed in Taiwan Semiconductor's official S2207 datasheet.
What is the maximum steady-state power dissipation for 1.5SMC51CA?
The 1.5SMC51CA has a steady-state power dissipation (PD) of 6.5W at TA = 25°C, as specified in its Absolute Maximum Ratings table. This value decreases with rising ambient temperature per the derating curve (Fig.2), reaching ~3.25W at 75°C ambient. Engineers must verify PCB copper area and airflow to maintain junction temperature ≤150°C under continuous leakage conditions.
Can 1.5SMC51CA be used in place of a unidirectional TVS like 1.5SMC51A?
No - the 1.5SMC51CA is bidirectional and lacks polarity dependence, whereas 1.5SMC51A is unidirectional and requires correct anode/cathode orientation. Substituting 1.5SMC51CA for 1.5SMC51A may cause improper clamping on DC-biased lines or violate design assumptions in circuits relying on forward conduction behavior. Always match configuration suffix (A vs CA) to schematic intent and layout polarity markings.
What is the junction-to-case thermal resistance (RθJC) of 1.5SMC51CA?
The junction-to-case thermal resistance (RθJC) of the 1.5SMC51CA is 15°C/W, as published in the Thermal Performance section of the datasheet. This parameter reflects heat transfer efficiency from the silicon die to the external package surface and is critical when designing thermal relief pads or heatsinking strategies for high-duty-cycle surge events.
1.5SMC51CA 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):
- 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)
1.5SMC51CA FAQ
1.How can I place an order for 1.5SMC51CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51CA 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 1.5SMC51CA reliable?
The price and inventory of 1.5SMC51CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51CA is usually 5 days.
3.What payment methods are accepted for 1.5SMC51CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51CA?
1.5SMC51CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51CA 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 1.5SMC51CA?
For technical support, including 1.5SMC51CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51CA requirements.
6.How does Aetrix verify that 1.5SMC51CA is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51CA 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 1.5SMC51CA meets industry standards.
7.What is the process for return or replacement of 1.5SMC51CA?
All 1.5SMC51CA units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51CA, 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 1.5SMC51CA part is unused and in its original packaging.
Return procedure for 1.5SMC51CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51CA Tags
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