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Taiwan Semiconductor Corporation 1.5SMC56A
- Part No.:
- 1.5SMC56A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC56A.pdf
- Description:
- TVS DIODE 47.8VWM 77VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,704
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Product details
Overview
1.5SMC56A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 1500W peak pulse power, 53.2–58.8V breakdown voltage (VBR), and 77.0V maximum clamping voltage (VC@IPPM). It protects DC power rails and signal lines in telecom and industrial equipment against ESD, lightning surges, and load-switching transients.
For engineers reviewing the 1.5SMC56A datasheet, 1.5SMC56A pinout, 1.5SMC56A application, or 1.5SMC56A equivalent, this device offers verified clamping performance at 1A test current, <1μA leakage at 47.8V working stand-off voltage, ISO 7637-2 compliance, and JESD201 Class 2 whisker resistance - critical for automotive-grade board-level surge immunity design.
Technical Context
The 1.5SMC56A employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps), enabling effective suppression of sub-nanosecond ESD events per IEC 61000-4-2. Its unidirectional configuration provides low forward voltage drop (3.5V @ 50A) only in forward conduction mode, with reverse-biased operation defined by VWM = 47.8V and VBR = 53.2–58.8V.
Thermal performance is characterized by RθJA = 50°C/W and RθJC = 15°C/W, supporting sustained operation up to TJ = +150°C. The device meets moisture sensitivity level 1 (J-STD-020) and UL 94V-0 flammability requirements, confirming suitability for reflow-soldered high-reliability assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1mA | 53.2–58.8V: Ensures reliable turn-on before system overvoltage damage occurs |
| VWM | 47.8V: Maximum continuous reverse operating voltage without significant leakage |
| VC @ IPPM = 20A | 77.0V: Clamped voltage during 10/1000μs surge - defines protected circuit's max stress level |
| PPK | 1500W: Peak pulse power handling per single 10/1000μs waveform per Fig.5 |
| IR @ VWM | <1μA: Minimal standby power loss and signal integrity impact in high-impedance circuits |
| TJ Range | −55°C to +150°C: Enables deployment in under-hood automotive or industrial ambient environments |
| Package | DO-214AB (SMC): Standardized SMT footprint compatible with automated placement and IPC-7351B land patterns |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-die unidirectional TVS diode with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Forward conduction terminal | Connects to lower-potential side of protected line; conducts surge current to ground when forward-biased |
| Cathode (banded end) | Reverse-blocking / clamping terminal | Connects to higher-potential side; avalanches at VBR to clamp transients to VC = 77.0V |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance (±5% for 'A' suffix) and long-term reliability under thermal cycling |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Validated for automotive load-dump and supply-transient immunity without external filtering |
| Fast response time <1.0 ps | Clamps ESD events before IC input structures experience breakdown (per IEC 61000-4-2) |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance for consumer, telecom, and industrial end-equipment |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow - reduces manufacturing cost and process risk |
Applications
| Automotive Power Line Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery rail in vehicle infotainment modules exposed to load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp surges above 47.8V while remaining non-conductive during normal operation. Use Value: Limits peak rail voltage to ≤77.0V during 1500W transients, preventing damage to downstream DC-DC converters and microcontrollers. |
Use Scenario: 24V digital input channel on programmable logic controller subjected to field-wiring induced surges and ESD contact discharge. IC Role / Device Role / Timing Role: Reverse-biased TVS across input terminal and common reference to shunt transient energy before reaching optocoupler or protection FET. Use Value: Achieves <1μA leakage at 47.8V, preserving input threshold accuracy while clamping 20A surges within 10/1000μs to protect isolation barriers. |
| Telecom Ethernet Port Surge Suppression | Consumer USB Power Delivery Line |
Use Scenario: Secondary-side protection on PoE-powered Ethernet switch ports where DC bias coexists with fast transients. IC Role / Device Role / Timing Role: Unidirectional TVS on +48V PSE output line, oriented to block reverse current while clamping positive surges. Use Value: Withstands repeated 10/1000μs surges up to 1500W without parameter drift, maintaining VC ≤77.0V across full temperature range. |
Use Scenario: Overvoltage protection on 5V/9V/15V USB PD bus lines in portable docking stations subject to hot-plug transients and ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between VCONN and GND to absorb coupling-induced spikes without affecting PD negotiation signaling. Use Value: 47.8V VWM ensures no conduction during 20V PD max, while 77.0V VC prevents latch-up in connected Type-C controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ56A (Bourns) | Same DO-214AA (SMB) package; 600W rating (vs. 1500W); VC = 93.6V @ 11.9A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select 1.5SMC56A when >1000W surge capability and sub-80V clamping are required |
| SMCJ56A (Littelfuse) | Identical DO-214AB (SMC) package and 1500W rating; VBR = 53.2–58.8V; VC = 77.0V - functionally identical clamping performance | Same PCB footprint and electrical behavior; qualified to AEC-Q101 for automotive use | 1.5SMC56A is preferred for cost-sensitive industrial designs; SMCJ56A adds automotive qualification |
Compared with SMBJ56A, the 1.5SMC56A delivers 2.5× higher surge power handling and 16V lower clamping voltage - critical for protecting 48V systems. Against SMCJ56A, it offers identical protection specs at lower unit cost but without AEC-Q101 certification.
Availability
1.5SMC56A is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC I/O protection, telecom Ethernet port surge suppression, and consumer USB power delivery line applications requiring stable component supply and full traceability.
Supply support for 1.5SMC56A 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 ISO 9001 and IATF 16949 certified facilities.
The 1.5SMCxx(A) series was designed specifically for high-power, surface-mount transient suppression in automotive, industrial, and telecom infrastructure - prioritizing robust clamping, low leakage, and reflow-ready packaging.
FAQ
What is the breakdown voltage range of the 1.5SMC56A?
The 1.5SMC56A has a guaranteed breakdown voltage (VBR) range of 53.2V to 58.8V at IT = 1mA, measured per ANSI/IEEE C62.35. This ±5% tolerance ('A' suffix) ensures consistent clamping onset across production lots and supports precise overvoltage margining in 48V system designs.
Is the 1.5SMC56A suitable for bidirectional transient protection?
No - the 1.5SMC56A is a unidirectional TVS diode intended for DC-biased lines. For bidirectional AC or floating-signal protection, select the 1.5SMC56CA variant (with 'CA' suffix), which provides symmetrical clamping in both polarities and matches the same VBR, VC, and PPK ratings.
What is the maximum clamping voltage of the 1.5SMC56A during a surge event?
The 1.5SMC56A clamps to a maximum of 77.0V when subjected to its rated peak pulse current of 20A (10/1000μs waveform). This value is guaranteed across temperature and lifetime, defining the absolute upper voltage stress imposed on protected circuitry during worst-case transients.
Does the 1.5SMC56A require special handling for moisture sensitivity?
No - the 1.5SMC56A is rated at Moisture Sensitivity Level 1 (MSL-1) per J-STD-020, meaning it may be stored indefinitely at ambient conditions and placed directly into reflow without baking. This eliminates pre-conditioning steps and reduces manufacturing overhead in high-volume SMT lines.
How does the 1.5SMC56A compare to the 1.5SMC56 (non-A) version?
The 1.5SMC56A offers tighter VBR tolerance (±5%) versus the standard 1.5SMC56 (±10%), resulting in more predictable clamping onset. Its VC is also lower (77.0V vs. 80.5V), improving protection margin. Both share identical package, power rating, and thermal specs - the 'A' suffix denotes enhanced parametric consistency.
1.5SMC56A 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):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 20A
- 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)
1.5SMC56A FAQ
1.How can I place an order for 1.5SMC56A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC56A 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 1.5SMC56A reliable?
The price and inventory of 1.5SMC56A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC56A is usually 5 days.
3.What payment methods are accepted for 1.5SMC56A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC56A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC56A?
1.5SMC56A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC56A 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 1.5SMC56A?
For technical support, including 1.5SMC56A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC56A requirements.
6.How does Aetrix verify that 1.5SMC56A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC56A 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 1.5SMC56A meets industry standards.
7.What is the process for return or replacement of 1.5SMC56A?
All 1.5SMC56A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC56A, 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 1.5SMC56A part is unused and in its original packaging.
Return procedure for 1.5SMC56A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC56A Tags
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