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Taiwan Semiconductor Corporation 1.5SMC51AH
- Part No.:
- 1.5SMC51AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51AH.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,513
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Product details
Overview
1.5SMC51AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 51 V breakdown voltage (48.5–53.6 V), 1500 W peak pulse power rating, 70.1 V maximum clamping voltage at 22 A, and AEC-Q101 qualification for automotive-grade reliability. It is used to protect CAN transceivers, USB ports, and industrial I/O circuits against ESD and lightning-induced transients.
For engineers reviewing the 1.5SMC51AH datasheet, 1.5SMC51AH pinout, 1.5SMC51AH application, or 1.5SMC51AH equivalent, key selection criteria include its DO-214AB (SMC) package, unidirectional polarity, 1.0 mA test current, 43.6 V working stand-off voltage, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump immunity.
Technical Context
The 1.5SMC51AH operates as a silicon avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) and stable clamping under repetitive or single-event transients. Its thermal resistance of 15 °C/W (junction-to-case) supports sustained operation up to 150 °C junction temperature, while its 50 °C/W junction-to-ambient rating defines PCB thermal design requirements.
It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity, ensuring robustness in automated SMT assembly. Electrical behavior is defined per ANSI/IEEE C62.35, with bidirectional variants available via CAH suffix - but 1.5SMC51AH itself is strictly unidirectional, indicated by cathode band marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 48.5–53.6 V @ 1.0 mA - defines minimum voltage at which avalanche conduction begins; ensures reliable turn-on before downstream IC damage |
| Working Stand-off Voltage (VWM) | 43.6 V - maximum continuous DC or RMS voltage the device blocks without leakage exceeding 1 µA |
| Maximum Clamping Voltage (VC) | 70.1 V @ 22 A peak pulse - limits transient voltage seen by protected circuit during 10/1000 µs surge |
| Peak Pulse Power (PPK) | 1500 W - energy-handling capability for standardized 10/1000 µs waveform per Fig.5 |
| Junction Temperature Range | −55 °C to +150 °C - enables operation in under-hood automotive or industrial environments |
| Leakage Current (IR) | <1 µA @ 43.6 V - negligible standby power loss and minimal impact on high-impedance sensing nodes |
| Thermal Resistance (RθJC) | 15 °C/W - determines heatsinking requirement when operating near steady-state power limit (6.5 W) |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (non-banded end) | Connected to protected line; conducts only during reverse-biased overvoltage events |
| Cathode | Ground/reference side (banded end) | Connected to system ground or low-impedance return path; defines polarity and clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including temperature cycling, HTRB, and ESD |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line capacitance discharge) |
| Glass-passivated junction | Enhances long-term stability and reduces parameter drift under thermal cycling and humidity exposure |
| Fast response time | <1.0 ps - clamps transients before sensitive logic or analog circuitry responds, preventing latch-up or damage |
| Moisture sensitivity Level 1 | No bake preconditioning required before reflow; compatible with standard SMT assembly lines |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects 12 V supply rail and LIN/CAN signal lines in BCM modules exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive-going transients above 43.6 V. Use Value: Limits voltage to ≤70.1 V during 1500 W pulses, preventing damage to MCU power supplies and transceiver ICs rated for 36 V absolute max. |
Use Scenario: Shields 24 V digital input channels in programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff protector on dry-contact inputs, absorbing energy from inductive coil de-energization and nearby lightning coupling. Use Value: Withstands ≥22 A 10/1000 µs pulses without degradation, maintaining <1 µA leakage at 24 V nominal - preserving input threshold accuracy. |
| USB 2.0 Port ESD Protection | DC Power Supply Input Stage |
Use Scenario: Installed on VBUS and D+/D− lines of embedded USB host ports to meet IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Fast-clamping unidirectional suppressor on VBUS; bidirectional variants (e.g., 1.5SMC51CAH) used on data lines. Use Value: Sub-1 ps response ensures clamping occurs before USB PHY transceivers experience overstress; 70.1 V clamping avoids VBUS regulator shutdown. |
Use Scenario: Placed across input terminals of 48 V telecom power supplies to absorb lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary front-end surge limiter, coordinated with MOVs and gas discharge tubes in multi-stage protection networks. Use Value: 1500 W rating allows it to absorb first-wave energy without failure; DO-214AB footprint enables compact layout adjacent to connector entry point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | Same 51 V breakdown range, but 600 W PPK; DO-214AA (SMB) package - smaller footprint, lower thermal mass | Lower power handling limits use to sub-10 A surge environments; unsuitable for ISO 7637-2 Pulse 1 (load dump) | Select SMBJ51A only for space-constrained consumer designs where peak surge energy is ≤600 W |
| 1.5KE51A | Through-hole TO-204AA (DO-41); identical 51 V VBR, 1500 W rating, but slower response (~1 ns) and no AEC-Q101 qualification | Lacks automotive qualification and SMT compatibility; requires wave-solder or hand-solder process | Choose 1.5KE51A for legacy through-hole industrial systems where rework tolerance and cost outweigh SMT and qualification needs |
Compared with SMBJ51A and 1.5KE51A, the 1.5SMC51AH uniquely combines AEC-Q101 qualification, 1500 W surge capacity, and DO-214AB SMT packaging - making it the preferred choice for new automotive and high-reliability industrial designs requiring automated assembly and load-dump immunity.
Availability
1.5SMC51AH is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, USB power rail hardening, and telecom DC input stages requiring stable component supply and full traceability.
Supply support for 1.5SMC51AH 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 for automotive, industrial, and computing markets.
The 1.5SMCxxAH series was developed to deliver AEC-Q101-qualified, high-power surface-mount TVS protection for next-generation vehicle ECUs and ruggedized industrial controllers demanding ISO 7637-2 compliance and zero-defect SMT reliability.
FAQ
What is the polarity configuration of the 1.5SMC51AH?
The 1.5SMC51AH is a unidirectional TVS diode, with cathode indicated by a band on the DO-214AB package. It conducts only when the anode is more negative than the cathode - i.e., it clamps positive transients on the cathode side relative to anode. This configuration matches standard DC power rail protection topologies and differs from bidirectional variants like 1.5SMC51CAH.
Does the 1.5SMC51AH meet automotive surge immunity standards?
Yes, the 1.5SMC51AH is explicitly validated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive discharge). Its 1500 W peak power rating and 70.1 V clamping voltage at 22 A ensure compliance when properly mounted with low-inductance grounding - a key requirement for automotive body electronics and ADAS subsystems.
What is the maximum steady-state power dissipation for the 1.5SMC51AH?
The 1.5SMC51AH has a steady-state power dissipation (PD) of 6.5 W at TA = 25 °C. This value derates linearly above 25 °C per the thermal derating curve (Fig.2), reaching zero at 150 °C junction temperature. For continuous operation, PCB copper area and thermal vias must be designed to maintain TJ ≤ 150 °C under worst-case ambient conditions.
How does the 1.5SMC51AH compare to the 1.5SMC51H variant?
The 1.5SMC51AH offers tighter breakdown voltage tolerance (48.5–53.6 V) versus the 1.5SMC51H (45.9–56.1 V), resulting in more consistent clamping onset and reduced risk of premature conduction. Both share identical package, power rating, and AEC-Q101 qualification, but the "A" grade is preferred for designs requiring higher parametric consistency in production lots.
Is the 1.5SMC51AH RoHS and halogen-free compliant?
Yes, the 1.5SMC51AH is fully RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads satisfy J-STD-002 solderability requirements - confirming suitability for lead-free reflow processes and environmentally regulated end markets including EU automotive and industrial equipment.
1.5SMC51AH 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):
- 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)
1.5SMC51AH FAQ
1.How can I place an order for 1.5SMC51AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51AH 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 1.5SMC51AH reliable?
The price and inventory of 1.5SMC51AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51AH is usually 5 days.
3.What payment methods are accepted for 1.5SMC51AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51AH?
1.5SMC51AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51AH 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 1.5SMC51AH?
For technical support, including 1.5SMC51AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51AH requirements.
6.How does Aetrix verify that 1.5SMC51AH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51AH 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 1.5SMC51AH meets industry standards.
7.What is the process for return or replacement of 1.5SMC51AH?
All 1.5SMC51AH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51AH, 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 1.5SMC51AH part is unused and in its original packaging.
Return procedure for 1.5SMC51AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51AH Tags
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