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Taiwan Semiconductor Corporation SMCJ170AH
- Part No.:
- SMCJ170AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ170AH.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,707
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Product details
Overview
SMCJ170AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 170V working stand-off voltage (VWM), 189–209V breakdown voltage (VBR), and 275V maximum clamping voltage (VC) at 5.7A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ170AH datasheet, SMCJ170AH pinout, SMCJ170AH application, or SMCJ170AH equivalent, this device is selected for high-energy surge immunity in 24V/48V DC systems where low leakage (<1µA @ 170V), AEC-Q101 qualification, and fast sub-1ps response are required.
Technical Context
The SMCJ170AH uses a glass-passivated silicon junction optimized for unidirectional transient suppression. Its clamping behavior is defined by a 10/1000µs waveform per REA standards, with thermal resistance of RθJC = 10°C/W enabling reliable power dissipation under repetitive surge conditions up to TJ = 150°C.
It operates as a single-die, cathode-banded device with polarity marking per JEDEC DO-214AB outline. Forward voltage is specified at 5.0V @ 100A, confirming its suitability for high-current surge events without forward conduction interference in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage threshold for 24V/48V bus protection. |
| VBR min/max | 189–209 V @ IT = 1 mA - Confirmed breakdown range ensures predictable turn-on margin above VWM for robust noise immunity. |
| VC @ IPPM | 275 V @ 5.7 A - Clamping voltage during 10/1000µs surge defines worst-case voltage seen by downstream ICs. |
| PPK | 1500 W - Peak pulse power rating determines survivability against ISO 7637-2 Pulse 2b (inductive load dump) events. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves signal integrity and minimizes standby power loss in always-on systems. |
| TJ max | +150 °C - Junction temperature rating supports operation in under-hood automotive environments and enclosed industrial enclosures. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; forms clamping loop with cathode. |
| Cathode | Protected line input | Connected to power rail (e.g., +24V); clamps transients to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (load dump), and Pulse 3a/3b (capacitive coupling) test profiles. |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives, supporting J-STD-020 Level 1 MSL. |
| Sub-1 ps response time | Ensures clamping activation before ESD or fast transients damage sensitive CAN, LIN, or microcontroller I/O pins. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally constrained industrial and automotive supply chains. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V supply lines in body control modules (BCM) and junction boxes against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp surges before regulation stage. Use Value: Withstands 1500W pulses while limiting clamped voltage to 275V, preventing overvoltage failure of downstream 36V-rated regulators and gate drivers. |
Use Scenario: Shielding digital input channels on programmable logic controllers from field-wiring induced transients in factory automation. IC Role / Device Role / Timing Role: Standoff-connected TVS on isolated 24V input terminals, referenced to local ground plane. Use Value: Sub-1µA leakage avoids false triggering of optocoupler inputs; DO-214AB footprint enables automated placement alongside signal conditioning components. |
| Telecom Power Feeds | Renewable Energy Inverter DC Link |
Use Scenario: Safeguarding PoE-powered equipment front-end circuits from lightning-induced surges on Ethernet cable pairs. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on each DC feed line (48V nominal), grounded via chassis. Use Value: 170V VWM provides sufficient margin above 57V PoE+ peak, while 275V VC ensures Ethernet PHY ICs remain within absolute maximum ratings. |
Use Scenario: Transient suppression on DC link capacitors in solar string inverters exposed to grid switching events and lightning coupling. IC Role / Device Role / Timing Role: Parallel-mounted TVS across DC bus (±350V nominal), thermally coupled to heatsink via case contact. Use Value: RθJC = 10°C/W allows direct mounting to metal enclosure, sustaining repeated 1500W surges without thermal runaway in outdoor-rated enclosures. |
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 | 600W rating, SMB package (smaller footprint, higher RθJA = 85°C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 2b load dump | Select only if system-level surge energy is ≤600W and board space is constrained. |
| 1.5KE170A | Through-hole TO-218 package, same 1500W rating but slower response (~1ns), no AEC-Q101 qualification | Not suitable for automotive PCB assembly; requires wave soldering and larger keep-out area | Prefer for legacy industrial designs where reflow compatibility and automotive qualification are not required. |
Compared with SMBJ170A and 1.5KE170A, the SMCJ170AH delivers automotive-grade reliability, superior thermal performance in SMT layouts, and verified compliance with vehicle-level surge standards - making it the optimal choice for new 24V/48V embedded systems requiring zero-layout compromise on surge resilience.
Availability
SMCJ170AH is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom power feeds, and renewable energy inverter DC link applications requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ170AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices since 1979.
The SMCJ170AH belongs to TSC's AEC-Q101-qualified SMCJ(A)H series - engineered specifically for high-reliability transient suppression in automotive and harsh-environment industrial power systems.
FAQ
What is the clamping voltage of SMCJ170AH at its rated peak pulse current?
The SMCJ170AH has a maximum clamping voltage (VC) of 275 V at 5.7 A peak impulse current (IPPM), measured under the standard 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is confirmed in the Electrical Specifications table on page 3 of the official TSC datasheet revision A2102.
Is SMCJ170AH suitable for bidirectional transient protection?
No, the SMCJ170AH is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its forward voltage specification (VF = 5.0 V @ 100 A). For bidirectional protection in the same voltage range, TSC offers the SMCJ170CAH variant, which applies identical clamping performance in both polarities.
Does SMCJ170AH meet automotive qualification standards?
Yes, the SMCJ170AH is explicitly AEC-Q101 qualified per the manufacturer's documentation, with validation covering stress tests including temperature cycling, high-temperature operating life, and mechanical shock. It also meets ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements - essential for front-end protection in automotive ECUs and body electronics.
What is the thermal resistance from junction to case for SMCJ170AH?
The junction-to-case thermal resistance (RθJC) of the SMCJ170AH is 10°C/W, as published in the Thermal Performance section of the TSC datasheet. This low value enables effective heat transfer to a PCB copper pour or external heatsink, supporting sustained operation under repetitive surge conditions without exceeding the 150°C maximum junction temperature.
How does the leakage current of SMCJ170AH compare to lower-voltage variants in the same family?
The SMCJ170AH exhibits ≤1 µA reverse leakage current at its 170 V working stand-off voltage (VWM), consistent with the family's specification for devices rated above 10 V. Lower-voltage variants (e.g., SMCJ5.0AH) specify ≤5 µA at 10 V, reflecting the expected exponential increase in leakage at reduced VWM - confirming SMCJ170AH's suitability for high-impedance, low-power monitoring circuits.
SMCJ170AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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)
SMCJ170AH FAQ
1.How can I place an order for SMCJ170AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ170AH 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 SMCJ170AH reliable?
The price and inventory of SMCJ170AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ170AH is usually 5 days.
3.What payment methods are accepted for SMCJ170AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ170AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ170AH?
SMCJ170AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ170AH 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 SMCJ170AH?
For technical support, including SMCJ170AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ170AH requirements.
6.How does Aetrix verify that SMCJ170AH is sourced from the original manufacturer or authorized distributors?
All SMCJ170AH 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 SMCJ170AH meets industry standards.
7.What is the process for return or replacement of SMCJ170AH?
All SMCJ170AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ170AH, 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 SMCJ170AH part is unused and in its original packaging.
Return procedure for SMCJ170AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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