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Taiwan Semiconductor Corporation SMCJ17AH
- Part No.:
- SMCJ17AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ17AH.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,579
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Product details
Overview
SMCJ17AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 17V working stand-off voltage (VWM), 18.9–20.9V breakdown voltage (VBR), and 27.6V maximum clamping voltage (VC) at 57A peak pulse current - designed for automotive-grade ESD and surge protection in power supply rails and I/O lines.
For engineers reviewing the SMCJ17AH datasheet, SMCJ17AH pinout, SMCJ17AH application, or SMCJ17AH equivalent, this device delivers AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1μA reverse leakage above 10V, and robust thermal performance (RθJC = 10°C/W) - critical for high-reliability 12V automotive and industrial control systems.
Technical Context
The SMCJ17AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (18.9–20.9V @ 1mA), clamping transients to ≤27.6V at 57A (10/1000μs waveform). Its glass-passivated junction ensures stable breakdown and low leakage (<1μA @ 17V).
Designed for automotive environments, it meets AEC-Q101 stress requirements and ISO 7637-2 immunity standards for load dump and inductive switching events. Thermal resistance values (RθJA = 55°C/W, RθJC = 10°C/W) support reliable operation up to TJ = +150°C in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin for 12V systems. |
| VBR min/max | 18.9 / 20.9 V @ 1 mA - Confirmed breakdown threshold range; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 27.6 V @ 57 A - Clamped voltage during 10/1000μs surge; limits downstream IC stress to safe levels in automotive CAN/LIN bus protection. |
| PPK | 1500 W - Peak pulse power handling capability; supports single-event surges per ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (battery disconnect). |
| IR @ VWM | <1 μA @ 17 V - Ultra-low reverse leakage; prevents excessive quiescent current drain in always-on vehicle modules. |
| TJ max | +150 °C - Maximum junction temperature rating; enables use in under-hood ECUs without derating in ambient up to +125°C. |
| RθJC | 10 °C/W - Low junction-to-case thermal resistance; allows efficient heat transfer to copper pour or heatsinked pads in high-power transient scenarios. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, molded plastic case with matte tin-plated leads (J-STD-002 compliant), polarity indicated by cathode band. Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., 12V rail); conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping path and must be low-inductance for effective surge suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive temperature cycling, humidity, mechanical shock, and HTRB - enables use in engine control, body electronics, and ADAS modules. |
| ISO 7637-2 compliance | Tested against Pulse 1 (inductive load dump), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (capacitive coupling) - meets OEM-level EMC requirements. |
| Glass-passivated junction | Stable VBR tolerance and long-term reliability under repeated surge stress; eliminates parameter drift in harsh thermal environments. |
| Fast response time | <1 ps rise time from 0 V to VBR - protects sensitive MCU I/O and transceivers before damage thresholds are exceeded. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow - simplifies SMT assembly and reduces manufacturing overhead. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V battery-supplied microcontroller power inputs in engine control units (ECUs) against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between VCC and GND, clamping surges before they reach LDO regulators or MCU VDD pins. Use Value: Limits clamped voltage to 27.6V at 57A, ensuring downstream components remain within absolute maximum ratings during ISO 7637-2 Pulse 1 events. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC analog input cards exposed to field wiring transients. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMCJ17AH serves as unidirectional clamp on powered sensor lines where polarity is fixed. Use Value: Sub-1ps response and 1μA leakage preserve signal integrity and minimize offset error in precision 4–20mA loop interfaces. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding 12V/24V DC input stages of PoE-powered network switches and base station radios from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converters; coordinated with MOVs and gas discharge tubes in multi-stage designs. Use Value: 1500W peak power rating and 27.6V clamping enable robust front-end protection without sacrificing efficiency in compact telecom enclosures. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances (e.g., washing machine drum drives, HVAC blowers). IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge supply rails to clamp flyback voltages generated during PWM commutation. Use Value: 200A peak forward surge rating (IFSM) and 10°C/W RθJC allow repeated motor startup/stall events without thermal runaway or parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ17A | Same DO-214AC (SMA) package; lower PPK (400W), higher VC (33.2V @ 38.9A), and no AEC-Q101 qualification. | Not suitable for automotive under-hood use; limited to consumer or industrial applications with lower surge severity. | Select SMCJ17AH when AEC-Q101, ISO 7637-2, or 1500W clamping is required; SMAJ17A only if space-constrained and surge energy is below 400W. |
| Vishay SMF17A | DO-219AB (SOD-123FL) package; 200W PPK, 33.2V VC @ 6A, and no automotive qualification. | Intended for low-energy board-level ESD (IEC 61000-4-2), not load dump or ISO 7637-2 pulses. | Choose SMCJ17AH for full automotive-grade surge immunity; SMF17A only for cost-sensitive, low-risk consumer PCBs with minimal external threat exposure. |
Compared with SMAJ17A and SMF17A, the SMCJ17AH provides 3.75× and 7.5× higher peak power handling respectively, certified AEC-Q101 reliability, and clamping voltage optimized for 12V system margins - making it the sole choice for functional safety-critical automotive and industrial power rail protection.
Availability
SMCJ17AH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecommunications power supplies requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ17AH 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and computing markets.
The SMCJ series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive systems, emphasizing high PPK density, low clamping voltage, and robust thermal performance in surface-mount packages.
FAQ
What is the clamping voltage of the SMCJ17AH and how is it measured?
The SMCJ17AH has a maximum clamping voltage (VC) of 27.6 V, measured at 57 A peak pulse current using the standardized 10/1000 μs double-exponential waveform per IEC 61000-4-5 and ISO 7637-2. This value reflects worst-case device behavior under surge conditions and is guaranteed across temperature and lot variations.
Is the SMCJ17AH bidirectional or unidirectional?
The SMCJ17AH is a unidirectional TVS diode, indicated by the "H" suffix and cathode band marking. It clamps only in reverse bias; forward conduction follows standard silicon diode characteristics with VF ≈ 3.5 V at 100 A. For bidirectional protection, the SMCJ17CAH variant must be selected.
Does the SMCJ17AH meet AEC-Q101 requirements for automotive use?
Yes, the SMCJ17AH is explicitly AEC-Q101 qualified per the manufacturer's documentation, including stress testing for temperature cycling, high-temperature reverse bias, and humidity resistance - confirming suitability for under-hood and chassis-mounted automotive electronics.
What is the maximum steady-state power dissipation (PD) for the SMCJ17AH?
The SMCJ17AH has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, defined by its thermal resistance and package construction. This value applies only to continuous DC or low-frequency AC power; transient surge handling is governed separately by its 1500W PPK rating.
How does the SMCJ17AH compare to the SMCJ17H in terms of electrical performance?
The SMCJ17AH offers tighter VBR tolerance (18.9–20.9 V vs. 18.9–23.1 V for SMCJ17H) and lower clamping voltage (27.6 V vs. 30.5 V), resulting in improved protection margin for 12V systems. Both share identical package, PPK, and AEC-Q101 qualification, but SMCJ17AH is preferred for designs demanding precise clamping control.
SMCJ17AH 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 57A
- 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)
SMCJ17AH FAQ
1.How can I place an order for SMCJ17AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ17AH 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 SMCJ17AH reliable?
The price and inventory of SMCJ17AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ17AH is usually 5 days.
3.What payment methods are accepted for SMCJ17AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ17AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ17AH?
SMCJ17AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ17AH 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 SMCJ17AH?
For technical support, including SMCJ17AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ17AH requirements.
6.How does Aetrix verify that SMCJ17AH is sourced from the original manufacturer or authorized distributors?
All SMCJ17AH 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 SMCJ17AH meets industry standards.
7.What is the process for return or replacement of SMCJ17AH?
All SMCJ17AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ17AH, 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 SMCJ17AH part is unused and in its original packaging.
Return procedure for SMCJ17AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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