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Taiwan Semiconductor Corporation 1.5SMC170A
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- Part No.:
- 1.5SMC170A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC170A.pdf
- Description:
- 1500W, 170V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,685
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Product details
Overview
1.5SMC170A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 170V breakdown voltage (162–179V), 145V working stand-off voltage, 234V maximum clamping voltage at 6.7A peak impulse current, and 1500W peak pulse power dissipation - enabling robust protection against ESD, lightning-induced transients, and load-switching spikes in industrial power supplies.
For engineers reviewing the 1.5SMC170A datasheet, 1.5SMC170A pinout, 1.5SMC170A application, or 1.5SMC170A equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, leakage current at operating voltage, thermal resistance (RθJA = 50°C/W), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive-grade transient immunity.
Technical Context
The 1.5SMC170A operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-nanosecond response (<1.0 ps) to fast-rising transients. Its DO-214AB (SMC) package supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Electrical behavior is defined by precise VBR (162–179 V @ 1 mA), VWM = 145 V, IR ≤ 1 µA at VWM, and VC = 234 V @ IPPM = 6.7 A (10/1000 µs waveform). Thermal performance includes RθJC = 15°C/W and TJMAX = +150°C, enabling reliable operation under sustained ambient temperatures up to +125°C with derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 162 V / 179 V @ 1 mA - defines minimum and maximum guaranteed avalanche initiation threshold across production lot |
| VWM | 145 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 234 V @ 6.7 A (10/1000 µs) - clamped voltage seen by protected circuit during worst-case surge |
| PPK | 1500 W - peak transient power handling capability per single non-repetitive pulse |
| IR @ VWM | ≤1 µA - ensures negligible standby power loss and no interference with high-impedance sensing nodes |
| TJMAX | +150 °C - maximum junction temperature supporting operation in enclosed industrial enclosures |
| RθJA | 50 °C/W - enables thermal design with standard PCB copper area; requires ≥1 cm² 2-oz copper pad for full 1500W rating |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node; must be low-inductance path to handle 6.7A surge return |
| Cathode | Protected line input | Connected to line being protected (e.g., 12–48V rail); clamps to anode when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and humidity exposure; eliminates parameter drift in humid industrial environments |
| Clamping ratio (VC/VBR) | 1.45 (234 V / 162 V) - tight ratio minimizes overvoltage stress on downstream MOSFETs or controllers |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) - suitable for automotive body electronics without additional filtering |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - zero bake requirement prior to reflow; compatible with standard SMT assembly lines |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green manufacturing and export compliance |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
Use Scenario: 24V DC input stage of programmable logic controller (PLC) power supply exposed to load-dump transients and field-wiring faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V rail and chassis ground to clamp surges before they reach upstream DC-DC converter ICs. Use Value: Clamps 1500W transients to ≤234V, maintaining <10% overvoltage margin below typical 250V-rated input capacitors and ensuring >100,000 surge cycles without degradation. |
Use Scenario: CAN_H/CAN_L lines in BCM subjected to ISO 7637-2 Pulse 2a (battery disconnect) and Pulse 3b (capacitive coupling). IC Role / Device Role / Timing Role: Paired unidirectional 1.5SMC170A devices (one per line) referenced to local ground, providing bidirectional protection via dual placement. Use Value: Sub-1ps response captures fast edge transients before CAN transceiver input stages saturate; 1µA leakage avoids bus bias shift in low-power sleep modes. |
| Telecom Remote Radio Unit (RRU) DC Feeder Protection | Renewable Energy Inverter DC Link Surge Suppression |
Use Scenario: -48V DC feeder line entering outdoor RRU cabinet, subject to lightning-induced common-mode surges up to 1kV. IC Role / Device Role / Timing Role: Primary TVS on -48V input, coordinated with gas discharge tube (GDT) front-end for staged protection. Use Value: 145V VWM provides 20% margin above nominal -48V (derated for ripple), while 234V VC stays below -40V transceiver absolute maximum ratings. |
Use Scenario: 600–1000V DC link in solar string inverter exposed to grid-switching transients and nearby lightning strikes. IC Role / Device Role / Timing Role: String-level TVS bank (multiple 1.5SMC170A in parallel) across DC+ to DC− to limit overvoltage during rapid IGBT turn-off. Use Value: 1500W rating enables absorption of 100µs–1ms energy bursts without thermal runaway; DO-214AB footprint allows scalable parallel layout with low parasitic inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A (Bourns) | Same DO-214AA (SMB) package; 1500W rating; VBR = 162–179V; VC = 274V @ 5.5A - higher clamping voltage due to lower surge current rating | Less effective clamping margin for 200V-class systems; requires larger PCB area for same power density | Select SMBJ170A only if DO-214AB footprint unavailable; verify VC margin against protected device VDS(max) |
| 1.5KE170A (ON Semiconductor) | Through-hole DO-15 package; identical electrical specs (VBR, VC, PPK); RθJA = 60°C/W - 20% worse thermal performance | Not suitable for high-density SMT designs; requires wave solder or hand-solder process; incompatible with automated placement | Choose 1.5KE170A only for legacy through-hole boards or prototyping where reflow compatibility is not required |
Compared with SMBJ170A and 1.5KE170A, the 1.5SMC170A delivers superior clamping efficiency (234V vs. 274V) and thermal management (50°C/W vs. 60°C/W), making it optimal for space-constrained, high-reliability SMT applications requiring minimal overvoltage headroom and repeatable reflow yield.
Availability
1.5SMC170A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom remote radio units, and renewable energy inverters requiring stable component supply and long-term obsolescence management.
Supply support for 1.5SMC170A 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, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 and ISO 14001 certifications.
The 1.5SMC series was developed for high-reliability surface-mount surge protection in harsh environments - emphasizing low clamping ratio, MSL Level 1 assembly compatibility, and automotive-grade transient immunity per ISO 7637-2.
FAQ
What is the maximum clamping voltage of the 1.5SMC170A under standard test conditions?
The 1.5SMC170A has a maximum clamping voltage (VC) of 234 V when subjected to a 10/1000 µs waveform peak impulse current (IPPM) of 6.7 A. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage imposed on the protected circuit during worst-case surge events. The 1.5SMC170A maintains this clamping performance across its full operating temperature range (–55°C to +150°C) with minimal derating.
Is the 1.5SMC170A suitable for bidirectional transient protection?
No - the 1.5SMC170A is a unidirectional TVS diode intended for DC line protection with defined anode/cathode polarity. For bidirectional applications such as AC lines or differential buses, a 1.5SMC170CA variant (with "CA" suffix) must be used. The 1.5SMC170A lacks symmetrical breakdown characteristics and will conduct continuously if reverse-biased beyond its VWM of 145 V.
What is the leakage current specification for the 1.5SMC170A at its working stand-off voltage?
The 1.5SMC170A exhibits a maximum blocking leakage current (IR) of 1 µA when biased at its rated working stand-off voltage (VWM) of 145 V and tested at 25°C. This ultra-low leakage ensures minimal power loss in always-on systems and prevents false triggering in high-impedance monitoring circuits. Leakage remains below 5 µA up to 125°C ambient per thermal derating curves.
Does the 1.5SMC170A meet automotive transient immunity standards?
Yes - the 1.5SMC170A is explicitly validated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (supply disconnection and switching), and Pulse 3a/3b (capacitive coupling) requirements. Its 1500W peak power rating and 234V clamping voltage enable direct integration into automotive body control modules, infotainment power supplies, and sensor interface circuits without supplemental protection components.
What is the thermal resistance from junction-to-ambient for the 1.5SMC170A in standard mounting conditions?
The 1.5SMC170A has a junction-to-ambient thermal resistance (RθJA) of 50°C/W when mounted on a standard FR-4 PCB with 1 cm² of 2-ounce copper pad per terminal. This value assumes natural convection cooling and is critical for calculating maximum allowable average power dissipation in continuous surge environments. For higher reliability, use thermal vias and extended copper pours to approach the RθJC = 15°C/W limit.
1.5SMC170A 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):
- 145V
- Voltage - Breakdown (Min):
- 162V
- Voltage - Clamping (Max) @ Ipp:
- 234V
- Current - Peak Pulse (10/1000µs):
- 6.7A
- 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)
1.5SMC170A FAQ
1.How can I place an order for 1.5SMC170A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC170A 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 1.5SMC170A reliable?
The price and inventory of 1.5SMC170A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC170A is usually 5 days.
3.What payment methods are accepted for 1.5SMC170A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC170A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC170A?
1.5SMC170A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC170A 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 1.5SMC170A?
For technical support, including 1.5SMC170A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC170A requirements.
6.How does Aetrix verify that 1.5SMC170A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC170A 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 1.5SMC170A meets industry standards.
7.What is the process for return or replacement of 1.5SMC170A?
All 1.5SMC170A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC170A, 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 1.5SMC170A part is unused and in its original packaging.
Return procedure for 1.5SMC170A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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