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Taiwan Semiconductor Corporation 1.5SMC68A
- Part No.:
- 1.5SMC68A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC68A.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,473
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Product details
Overview
1.5SMC68A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 64.6–71.4 V breakdown voltage (VBR), 58.1 V working stand-off voltage (VWM), 92.0 V maximum clamping voltage (VC) at 17 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom front-ends, industrial I/O ports, and automotive body control modules.
For engineers reviewing the 1.5SMC68A datasheet, 1.5SMC68A pinout, 1.5SMC68A application, or 1.5SMC68A equivalent, this page delivers verified electrical parameters, DO-214AB package details, clamping performance under ISO 7637-2 transients, thermal resistance values, and real-world ESD/switching-surge protection use cases - all confirmed against Taiwan Semiconductor's S2207 specification release.
Technical Context
The 1.5SMC68A operates as a silicon avalanche diode with glass-passivated junction, optimized for fast response (<1.0 ps) to ESD and load-switching transients. Its unidirectional configuration provides reverse-biased clamping only, with forward voltage drop of 3.5 V at 50 A surge - consistent with the 1.5SMC6.8–1.5SMC91 family subset.
Thermal design is supported by RθJA = 50 °C/W and RθJC = 15 °C/W, enabling reliable operation up to TJ = 150 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for lead-free reflow assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V - defines guaranteed avalanche conduction onset range at 1 mA test current; ensures robust margin above 58.1 V operating rail |
| VWM | 58.1 V - maximum continuous reverse voltage before leakage exceeds 1 µA; sets safe DC operating ceiling for 48 V systems |
| VC @ IPPM | 92.0 V at 17 A - clamped voltage during 10/1000 µs surge; limits downstream IC stress to <92 V under worst-case ISO 7637-2 Pulse 1/2b |
| PPK | 1500 W - peak pulse power handling per single 10/1000 µs transient; supports repeated surges when derated per Fig.2 |
| IR @ VWM | <1 µA - ultra-low blocking leakage ensures minimal standby power loss in battery-backed or low-power sensor nodes |
| TJ max | +150 °C - maximum junction temperature; enables deployment in under-hood automotive or enclosed industrial enclosures |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 0.210 g mass, matte tin-plated leads, and UL 94V-0 molding compound |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with cathode band marking on one end; dual J-lead terminals; 7.11 mm × 6.22 mm × 2.34 mm footprint; RoHS-compliant and halogen-free per IEC 61249-2-21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC input or signal line side | Connected to protected line; conducts forward surge current up to 200 A (IFSM) in unidirectional mode |
| Cathode | Ground or return path | Marked end; sinks transient energy into ground plane; must be routed with low-inductance path to minimize VC overshoot |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance (±5% for 'A' grade) and long-term reliability under thermal cycling and humidity |
| Clamping ratio (VC/VBR) | 1.30–1.42 - low ratio confirms efficient energy diversion without excessive voltage overshoot during fast transients |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) - critical for automotive ECUs |
| Moisture sensitivity level 1 | Zero floor-life limitation; supports standard SMT reflow without baking - reduces manufacturing overhead |
| Fast response time | <1.0 ps - sub-picosecond junction response ensures clamping activation before most CMOS ICs experience gate oxide stress |
Applications
| Industrial PLC Analog Input | Automotive Body Control Module |
|---|---|
Use Scenario: 0–10 V analog sensor inputs exposed to relay coil back-EMF and cable discharge events. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at connector entry point before signal conditioning amplifier. Use Value: Limits transient excursions to ≤92.0 V, preserving 12-bit ADC integrity and preventing op-amp saturation or latch-up in TI PGA309 or AD7793-based front-ends. |
Use Scenario: LIN bus and switched 12 V supply lines in door module ECUs subjected to ISO 7637-2 Pulse 2b (load dump simulation). IC Role / Device Role / Timing Role: Unidirectional TVS on VBAT rail and LIN transceiver I/O pins. Use Value: Absorbs 1500 W pulses without degradation, maintaining LIN physical layer compliance while protecting NXP UJA1075 or Infineon TLE7259-2GE. |
| Telecom Ethernet Surge Protection | Smart Meter Power Supply Input |
Use Scenario: Secondary-side 48 V DC power feed to PoE-powered devices encountering lightning-induced surges on building wiring. IC Role / Device Role / Timing Role: Final-stage clamping device after primary MOV/GDT stage in multi-level protection architecture. Use Value: Provides precise 92.0 V clamping with <1 µA leakage, ensuring no interference with IEEE 802.3af/at detection signatures or DC-DC converter feedback stability. |
Use Scenario: AC/DC adapter output rail in utility smart meters exposed to grid switching transients and neutral-ground faults. IC Role / Device Role / Timing Role: Standoff-rated protector on 5 V or 3.3 V logic supply derived from isolated flyback converter. Use Value: Maintains 58.1 V VWM margin above nominal 48 V input, enabling fail-safe shutdown before microcontroller brownout (e.g., ST STM32L4+ or Renesas RL78/I1C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A (Bourns) | Same DO-214AA package; 64.0–71.1 V VBR; 93.6 V VC @ 16.2 A; 600 W rating | Lower peak power (600 W vs. 1500 W); suitable for lower-energy transients like IEC 61000-4-2 ESD only | Select SMBJ64A only if system-level testing confirms 600 W clamping capacity suffices and board space constraints favor smaller DO-214AA footprint. |
| SMCJ64A (Littelfuse) | Identical DO-214AB package; 64.0–71.1 V VBR; 103 V VC @ 14.6 A; 1500 W rating | Higher clamping voltage (103 V vs. 92.0 V); wider VBR tolerance (±10% vs. ±5%) | Choose SMCJ64A only if layout allows higher clamped voltage margin and tighter VBR control is not required for precision rail protection. |
Compared with SMBJ64A and SMCJ64A, the 1.5SMC68A delivers superior clamping efficiency (92.0 V) and tighter VBR tolerance (±5%), making it optimal for 48 V systems where downstream ICs have narrow absolute maximum ratings - especially where ISO 7637-2 Pulse 1 immunity is mandatory.
Availability
1.5SMC68A is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive body control modules, telecom Ethernet surge protection, and smart meter power supply inputs requiring stable component supply across extended production lifecycles.
Supply support for 1.5SMC68A 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 - headquartered in Hsinchu Science Park with global distribution and AEC-Q200 qualified product lines.
The 1.5SMC68A belongs to TSC's high-power SMC-series TVS family, engineered specifically for automotive-grade and industrial-grade DC rail protection where robustness against ISO 7637-2 and IEC 61000-4-5 transients is non-negotiable.
FAQ
What is the breakdown voltage range for the 1.5SMC68A?
The 1.5SMC68A has a guaranteed breakdown voltage (VBR) range of 64.6 V to 71.4 V at 1 mA test current, per Taiwan Semiconductor's S2207 datasheet. This ±5% tolerance ensures predictable clamping onset across temperature and unit-to-unit variation, critical for protecting 48 V systems where overvoltage margins are tight. The 'A' suffix denotes the tighter VBR tolerance grade.
How does the 1.5SMC68A differ from the non-A version 1.5SMC68?
The 1.5SMC68A offers tighter breakdown voltage tolerance (±5%, 64.6–71.4 V) versus the standard 1.5SMC68 (±10%, 61.2–74.8 V), and a lower clamping voltage (92.0 V vs. 98.0 V at rated IPPM). Both share identical DO-214AB packaging and 1500 W peak power rating, but the 1.5SMC68A is preferred where precise voltage limiting is required - such as in regulated 48 V DC-DC outputs feeding sensitive microcontrollers.
Is the 1.5SMC68A suitable for bidirectional transient protection?
No - the 1.5SMC68A is a unidirectional TVS diode intended for DC rail protection with defined polarity. For bidirectional applications (e.g., AC lines or data buses), Taiwan Semiconductor specifies the 1.5SMC68CA variant. Using the 1.5SMC68A in reverse-biased configurations risks catastrophic failure due to lack of symmetrical avalanche capability.
What is the maximum clamping voltage of the 1.5SMC68A under surge conditions?
The 1.5SMC68A clamps to a maximum of 92.0 V when subjected to its rated 17 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during worst-case transients - essential for verifying compatibility with downstream IC absolute maximum ratings.
Does the 1.5SMC68A meet automotive qualification standards?
Yes - the 1.5SMC68A meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b, and is manufactured to JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1. While not explicitly AEC-Q200 certified in this datasheet revision, its construction, thermal specs (TJ max = +150°C), and transient performance align with automotive body electronics requirements when validated per customer test plans.
1.5SMC68A 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):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 17A
- 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)
1.5SMC68A FAQ
1.How can I place an order for 1.5SMC68A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC68A 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 1.5SMC68A reliable?
The price and inventory of 1.5SMC68A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC68A is usually 5 days.
3.What payment methods are accepted for 1.5SMC68A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC68A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC68A?
1.5SMC68A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC68A 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 1.5SMC68A?
For technical support, including 1.5SMC68A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC68A requirements.
6.How does Aetrix verify that 1.5SMC68A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC68A 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 1.5SMC68A meets industry standards.
7.What is the process for return or replacement of 1.5SMC68A?
All 1.5SMC68A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC68A, 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 1.5SMC68A part is unused and in its original packaging.
Return procedure for 1.5SMC68A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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