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Taiwan Semiconductor Corporation 1.5SMC68
- Part No.:
- 1.5SMC68
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC68.pdf
- Description:
- 1500W, 68V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,606
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Product details
Overview
1.5SMC68 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 61.2–74.8 V breakdown voltage (VBR), 1500 W peak pulse power (PPK), 98.0 V maximum clamping voltage (VC) at 16 A, and DO-214AB (SMC) package - used in telecom power input stages, industrial I/O protection, and automotive body control modules.
For engineers reviewing the 1.5SMC68 datasheet, 1.5SMC68 pinout, 1.5SMC68 application, or 1.5SMC68 equivalent, key selection criteria include clamping performance under 10/1000 µs surge, low leakage (<1 µA @ 55.1 V), ISO 7637-2 compliance, and thermal resistance (RθJA = 50 °C/W) for high-reliability board-level ESD and load-dump suppression.
Technical Context
The 1.5SMC68 operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) to transients while maintaining stable VBR temperature coefficient (0.104 %/°C). Its single-die DO-214AB construction supports automated placement and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
It delivers 1500 W peak pulse power per 1 ms waveform (per Fig.5), with clamping validated at 16 A (IPPM) and VC ≤ 98.0 V - ensuring protected downstream circuitry remains below safe voltage thresholds during ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 61.2–74.8 V - defines reliable avalanche initiation range for overvoltage detection |
| VWM | 55.1 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPPM = 16 A | ≤98.0 V - clamped voltage during 10/1000 µs surge, limiting stress on protected ICs |
| PPK | 1500 W - peak transient energy absorption capability per single 1 ms pulse |
| IR @ VWM | <1 µA - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| RθJA | 50 °C/W - enables thermal design for 6.5 W steady-state dissipation without forced cooling |
| Package | DO-214AB (SMC) - industry-standard SMT outline with 7.11 × 6.22 mm footprint and cathode band marking |
Pinout & Package
DO-214AB (SMC) is a two-terminal surface-mount package with cathode band marking for unidirectional polarity. Terminals are matte tin-plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage rail; forms current path during reverse-biased clamping |
| Cathode (marked) | High-side transient sink | Connected to protected line; conducts surge current to ground when VIN exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated for automotive load-dump (Pulse 2b), supply interruption (Pulse 3b), and coupled transients |
| Fast response time <1.0 ps | Clamps ESD and lightning-induced spikes before sensitive logic or analog circuitry is damaged |
| J-STD-020 Level 1 moisture sensitivity | Enables standard reflow assembly without baking or special handling |
| RoHS and halogen-free | Meets IEC 61249-2-21 and EU regulatory requirements for green electronics manufacturing |
Applications
| Telecom Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 48 V DC power inputs of VoIP gateways and base station backhaul equipment against induced surges from nearby lightning strikes or AC line coupling. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp transients before they reach DC-DC converters and PMICs. Use Value: Limits clamped voltage to ≤98.0 V during 16 A 10/1000 µs surges, preserving 100 V-rated input capacitors and preventing latch-up in upstream regulators. | Use Scenario: Safeguarding 24 V digital input channels of programmable logic controllers against field-wiring faults, relay coil flyback, and electrostatic discharge during panel maintenance. IC Role / Device Role / Timing Role: Standoff protector on each optocoupler input leg, absorbing >1 kV ESD (IEC 61000-4-2) and 500 V ring wave (IEC 61000-4-5). Use Value: Sub-µA leakage at 55.1 V prevents false triggering of 24 V logic thresholds, while 1500 W peak power handles repetitive industrial switching noise. |
| Automotive Body Control Module (BCM) | Consumer Appliance Motor Drive Supply Rail |
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) on 12 V battery-fed microcontroller power supplies in door module ECUs. IC Role / Device Role / Timing Role: Primary clamping device across VBAT and GND, coordinated with upstream fuses and secondary LC filtering. Use Value: Meets ISO 7637-2 Pulse 2b (load dump) with RθJA = 50 °C/W enabling operation up to +125 °C ambient in engine bay proximity. | Use Scenario: Protecting 310 V DC bus rails in brushless motor inverters of washing machines and HVAC blowers from inductive kickback during MOSFET commutation. IC Role / Device Role / Timing Role: Parallel-mounted TVS on bulk capacitor terminals to absorb stored inductive energy during fault shutdown. Use Value: 98.0 V clamping at 16 A limits voltage overshoot below 400 V rating of 450 V electrolytic capacitors, extending service life and reducing failure rate. |
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; lower PPK (600 W); VC = 103 V @ 9.6 A | Lower surge capacity suits consumer-grade 24 V systems, not automotive load-dump | Select when cost-sensitive designs tolerate higher clamping and reduced surge margin |
| 1.5KE68A (ON Semiconductor) | Through-hole DO-15 package; identical VBR/VC specs; PPK = 1500 W | Requires PCB layout change; unsuitable for high-density SMT production | Choose only for legacy through-hole redesigns where SMT conversion is impractical |
Compared with SMBJ64A and 1.5KE68A, the 1.5SMC68 provides optimal balance of SMT manufacturability, 1500 W surge headroom, and 98.0 V clamping - making it preferred for new automotive and industrial designs requiring ISO 7637-2 compliance and automated assembly.
Availability
1.5SMC68 is available at Aetrix Electronics and suitable for telecom power input protection, industrial PLC I/O hardening, and automotive BCM surge suppression requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for 1.5SMC68 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 industrial and automotive markets.
The 1.5SMC68 belongs to TSC's SMC-series TVS family engineered for high-power, surface-mount transient suppression in harsh environments - targeting applications demanding ISO 7637-2 compliance, AEC-Q101 readiness, and J-STD-020 Level 1 assembly compatibility.
FAQ
What is the maximum clamping voltage of the 1.5SMC68 under standard test conditions?
The 1.5SMC68 has a maximum clamping voltage (VC) of 98.0 V when subjected to a 10/1000 µs surge current of 16 A (IPPM). This value is measured per ANSI/IEEE C62.35 and ensures protected circuitry remains within safe operating limits during transient events. The 1.5SMC68 achieves this clamping performance while maintaining low leakage and stable thermal behavior across its rated junction temperature range.
Is the 1.5SMC68 suitable for bidirectional transient suppression?
No, the 1.5SMC68 is a unidirectional TVS diode intended for DC rail protection with defined anode-cathode polarity. For bidirectional applications, Taiwan Semiconductor specifies the 1.5SMC68C or 1.5SMC68CA variants - which feature symmetrical breakdown in both directions and require different marking and layout. Using the 1.5SMC68 in reverse-biased AC paths may result in unintended conduction or failure.
Does the 1.5SMC68 meet automotive transient immunity standards?
Yes, the 1.5SMC68 meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering common automotive transients including load dump, supply interruption, and coupled noise. Its 1500 W peak power rating, 98.0 V clamping, and 50 °C/W thermal resistance enable robust performance in body control modules and infotainment power supplies. The 1.5SMC68 is not AEC-Q101 qualified but is widely deployed in automotive-adjacent industrial systems.
What is the leakage current specification for the 1.5SMC68 at its working stand-off voltage?
The 1.5SMC68 exhibits a maximum blocking leakage current (IR) of less than 1 µA when biased at its working stand-off voltage (VWM) of 55.1 V. This ultra-low leakage preserves signal integrity in high-impedance sensing circuits and minimizes standby power loss in battery-backed systems. The 1.5SMC68 maintains this spec across its full operating temperature range (−55 °C to +150 °C) due to its glass-passivated junction construction.
Can the 1.5SMC68 be used in reflow soldering processes without preconditioning?
Yes, the 1.5SMC68 is rated at J-STD-020 Moisture Sensitivity Level 1, meaning it can be subjected to standard lead-free reflow profiles (peak ≤260 °C) without prior baking or dry-pack handling. Its DO-214AB (SMC) package uses UL 94V-0 molding compound and matte tin-plated leads compliant with J-STD-002, supporting high-yield automated assembly. This eliminates moisture-related popcorning risk and simplifies production logistics for the 1.5SMC68.
1.5SMC68 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):
- 55.1V
- Voltage - Breakdown (Min):
- 61.2V
- Voltage - Clamping (Max) @ Ipp:
- 98V
- Current - Peak Pulse (10/1000µs):
- 16A
- 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)
1.5SMC68 FAQ
1.How can I place an order for 1.5SMC68 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC68 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 1.5SMC68 reliable?
The price and inventory of 1.5SMC68 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC68 is usually 5 days.
3.What payment methods are accepted for 1.5SMC68?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC68 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC68?
1.5SMC68 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC68 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 1.5SMC68?
For technical support, including 1.5SMC68 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC68 requirements.
6.How does Aetrix verify that 1.5SMC68 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC68 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 1.5SMC68 meets industry standards.
7.What is the process for return or replacement of 1.5SMC68?
All 1.5SMC68 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC68, 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 1.5SMC68 part is unused and in its original packaging.
Return procedure for 1.5SMC68:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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