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Taiwan Semiconductor Corporation 1.5SMC51CAH
- Part No.:
- 1.5SMC51CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51CAH.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,732
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Product details
Overview
1.5SMC51CAH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 51V breakdown voltage (48.5–53.6V), 43.6V working stand-off voltage, and 70.1V maximum clamping voltage at 22A peak pulse current. It protects automotive and industrial power rails against ESD, lightning-induced surges, and load-switch transients.
For engineers reviewing the 1.5SMC51CAH datasheet, 1.5SMC51CAH pinout, 1.5SMC51CAH application, or 1.5SMC51CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and <1µA leakage above 43.6V.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector across DC power lines or signal paths. Its glass-passivated junction enables stable breakdown behavior under repetitive surge stress, while its bidirectional symmetry ensures identical clamping in both polarities - critical for AC-coupled interfaces or ungrounded systems.
The device meets automotive-grade reliability requirements: AEC-Q101 qualified, moisture sensitivity level 1 (J-STD-020), JESD 201 Class 2 whisker resistance, and UL 94V-0 molding compound. Thermal resistance is 50°C/W junction-to-ambient and 15°C/W junction-to-case, supporting sustained operation up to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V - guaranteed breakdown activation range at 1 mA test current; defines minimum overvoltage threshold before clamping begins |
| VWM | 43.6 V - maximum continuous operating voltage without significant leakage; sets safe DC rail margin below clamping onset |
| VC @ IPPM | 70.1 V at 22 A - peak clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure |
| PPK | 1500 W - peak pulse power handling per 1 ms waveform; supports high-energy transients like ISO 7637-2 Pulse 5a |
| IR @ VWM | <1 µA - ultra-low reverse leakage at rated stand-off voltage; avoids unnecessary power loss or false triggering in low-current systems |
| TJ max | +150 °C - maximum junction temperature rating; enables use in under-hood automotive or high-ambient industrial environments |
| Response time | <1.0 ps - intrinsic junction response speed; ensures clamping initiates before most system-level transients propagate |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration. Cathode band marking is absent - polarity is symmetrical; terminals are non-polarized and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient shunt path | Both terminals serve identically as clamping nodes; connected across protected line and return (e.g., CAN_H–CAN_L or VIN–GND) |
| Case | Thermal conduction path | Exposed metal slug provides primary thermal dissipation route to PCB copper; requires adequate thermal pad area per manufacturer layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and mechanical shock - suitable for engine control, body electronics, and ADAS power domains |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation - eliminates need for external filtering in 12V/24V vehicle networks |
| Glass passivated junction | Ensures long-term stability of VBR and leakage performance across temperature and humidity cycling; prevents parametric drift in harsh environments |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes without floor-life restrictions or special handling |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; supports green manufacturing and end-of-life recycling requirements for global OEM programs |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V/24V supply inputs in electronic control units (ECUs) against load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at power entry point before DC-DC converters or LDOs. Use Value: Clamps 1500W surges to ≤70.1V, preventing damage to downstream regulators and microcontrollers without adding series impedance or latency. |
Use Scenario: Safeguarding digital input/output channels on programmable logic controllers exposed to field wiring noise and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional clamping element across isolated signal pairs (e.g., 24V dry contact inputs). Use Value: Symmetrical clamping ensures protection regardless of signal polarity reversal; sub-1ps response prevents latch-up in optocoupler or digital isolator front-ends. |
| Telecom Line Interface | Consumer USB Power Delivery |
Use Scenario: Shielding Ethernet PHY or RS-485 transceivers from ESD and induced surges on outdoor or long-cable runs. IC Role / Device Role / Timing Role: Secondary-level protection placed after gas discharge tube (GDT) or polymer PTC, acting as fast clamping stage. Use Value: Low clamping voltage (70.1V) limits stress on transceiver ESD structures; bidirectional operation matches differential signaling requirements. |
Use Scenario: Adding robust overvoltage protection to USB-C power delivery (PD) ports where VBUS may experience hot-plug or adapter fault transients. IC Role / Device Role / Timing Role: Standoff-rated TVS across VBUS and GND to absorb ±15kV ESD and 100V/1ms surges per IEC 61000-4-5. Use Value: 43.6V VWM allows compatibility with 20V PD profiles; 1500W rating exceeds Level 4 surge immunity requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Same 51V bidirectional rating, but lower 600W peak power (vs. 1500W); DO-214AA (SMB) package (smaller footprint, higher thermal resistance) | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 Pulse 5a or load dump | Select when board space is constrained and surge energy is limited to ≤600W; verify thermal margin with RθJA = 85°C/W |
| 1.5KE51CA | Through-hole TO-218 package; same 51V rating and 1500W rating, but slower response (>1ns) and no AEC-Q101 qualification | Not suitable for automotive or automated SMT production; used in legacy industrial power supplies where manual assembly is acceptable | Choose only for through-hole prototyping or repair; avoid in new automotive or high-reliability SMT designs requiring AEC-Q101 and fast response |
Compared with SMBJ51CA and 1.5KE51CA, the 1.5SMC51CAH delivers superior surge robustness in a compact, automotive-qualified SMT package - enabling smaller PCB area than 1.5KE51CA and higher energy handling than SMBJ51CA without compromising reliability or assembly compatibility.
Availability
1.5SMC51CAH is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom line cards, and USB-C PD power ports requiring stable component supply and full AEC-Q101 compliance.
Supply support for 1.5SMC51CAH 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 ICs for industrial and automotive markets.
The 1.5SMCxxCAH series was designed specifically for high-reliability, high-energy transient suppression in automotive power networks and industrial control systems - emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust SMT manufacturability.
FAQ
What does the "CAH" suffix indicate in 1.5SMC51CAH?
The "CAH" suffix denotes a bidirectional configuration with AEC-Q101 qualification and DO-214AB (SMC) packaging. Unlike unidirectional "H" variants, the "CAH" version provides symmetrical clamping in both polarities - essential for protecting AC-coupled or floating signal lines. The 1.5SMC51CAH maintains identical electrical specs in either direction, including VBR, VC, and IPPM.
How does 1.5SMC51CAH differ from the unidirectional 1.5SMC51H?
The 1.5SMC51CAH is bidirectional with symmetrical VBR and clamping behavior, while the 1.5SMC51H is unidirectional and features a cathode band marking. The 1.5SMC51CAH supports applications like differential bus protection (e.g., CAN, RS-485), whereas the 1.5SMC51H is intended for DC rail-to-ground clamping. Both share identical VWM (43.6 V), VC (70.1 V), and PPK (1500 W) ratings.
Is 1.5SMC51CAH suitable for ISO 16750-2 load dump protection?
Yes - the 1.5SMC51CAH is rated for ISO 7637-2 Pulse 5a (load dump), which overlaps with ISO 16750-2 Test 4a requirements. With its 1500W peak power rating, 70.1V clamping voltage, and AEC-Q101 qualification, the 1.5SMC51CAH effectively limits voltage overshoot during 12V system load dump events. Layout must include low-inductance grounding and thermal relief per TSC's DO-214AB pad recommendations to sustain repeated pulses.
What is the maximum allowable mounting temperature for 1.5SMC51CAH during reflow soldering?
The 1.5SMC51CAH complies with J-STD-020 moisture sensitivity level 1, permitting unlimited floor life and standard lead-free reflow profiles. Peak reflow temperature must not exceed 260°C for ≤10 seconds, with ramp rates conforming to IPC/JEDEC J-STD-020. The device's matte tin-plated leads meet J-STD-002 solderability requirements, ensuring reliable wetting without voiding or dewetting during automated placement.
Can 1.5SMC51CAH be used in parallel to increase surge current handling?
No - paralleling multiple 1.5SMC51CAH devices is not recommended due to parameter mismatch (VBR tolerance ±5%) causing uneven current sharing and potential thermal runaway. For higher surge capacity, select a single higher-rated device (e.g., 3.0SMC51CAH) or implement staged protection with upstream current-limiting elements. The 1.5SMC51CAH is characterized and qualified as a standalone 1500W suppressor; its performance assumes single-device implementation.
1.5SMC51CAH 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC51CAH FAQ
1.How can I place an order for 1.5SMC51CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51CAH 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 1.5SMC51CAH reliable?
The price and inventory of 1.5SMC51CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51CAH is usually 5 days.
3.What payment methods are accepted for 1.5SMC51CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51CAH?
1.5SMC51CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51CAH 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 1.5SMC51CAH?
For technical support, including 1.5SMC51CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51CAH requirements.
6.How does Aetrix verify that 1.5SMC51CAH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51CAH 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 1.5SMC51CAH meets industry standards.
7.What is the process for return or replacement of 1.5SMC51CAH?
All 1.5SMC51CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51CAH, 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 1.5SMC51CAH part is unused and in its original packaging.
Return procedure for 1.5SMC51CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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