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Taiwan Semiconductor Corporation SMAJ17CA
- Part No.:
- SMAJ17CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CA.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,932
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Product details
Overview
SMAJ17CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails and signal lines. It features a 17 V working stand-off voltage (VWM), 18.9–20.9 V breakdown voltage (VBR), 30.5 V maximum clamping voltage (VC) at 13.1 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive infotainment power supplies and industrial sensor interfaces.
For engineers reviewing the SMAJ17CA datasheet, SMAJ17CA pinout, SMAJ17CA application, or SMAJ17CA equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, bidirectional surge handling capability, and compatibility with automated SMT placement on high-reliability PCBs.
Technical Context
The SMAJ17CA is a glass-passivated, single-die, bidirectional TVS diode optimized for fast response (<1.0 ps from 0 V to VBR min) and low leakage (<1 µA at VWM). Its junction operates from –55 °C to +150 °C and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
It delivers symmetrical clamping in both polarities, with a maximum clamping voltage of 30.5 V at 13.1 A (10/1000 µs), enabling effective suppression of ESD, lightning-induced surges, and load dump transients in 12 V and 24 V systems without forward conduction during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 12 V nominal rail. |
| VBR @ IT=1 mA | 18.9–20.9 V - Verified breakdown threshold ensures reliable turn-on during overvoltage events. |
| VC @ IPPM=13.1 A | 30.5 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress below 33 V tolerance. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform; supports ISO 7637-2 Pulse 1 & 2b compliance. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life and avoids false triggering in always-on circuits. |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060 g mass, matte tin-plated leads, and J-STD-002 solderability. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; dual axial terminals (anode/cathode) arranged in a single-row, two-terminal configuration. Polarity is marked by a band indicating cathode for unidirectional variants; SMAJ17CA is bidirectional, so the band denotes terminal symmetry - either terminal may serve as input/output depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; clamps to VC when voltage exceeds –VBR. |
| Cathode (banded end) | Transient current entry (positive polarity) | Accepts forward surge current during positive transients; clamps to VC when voltage exceeds +VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating DC lines without polarity constraints. |
| Sub-1 ps response time | Activates before most microsecond-scale transients fully develop, minimizing voltage overshoot. |
| ISO 7637-2 compliance | Validated against automotive electrical disturbance standards including Pulse 1 (inductive load dump), 2a/2b (supply interruption), and 3a/3b (capacitive coupling). |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly without dry-pack handling. |
Applications
| Automotive Infotainment Power Supply | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V input rails of head unit power modules from load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS device placed at board edge to shunt surge energy before it reaches DC/DC controllers and LDOs. Use Value: Limits clamped voltage to 30.5 V, ensuring downstream regulators (e.g., TPS54335) remain within absolute maximum ratings during 100 V/50 ms load dump events. | Use Scenario: Safeguarding RS-485 transceivers connected to long field wiring exposed to EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Line-side TVS placed differential across A/B bus lines and common-mode to ground. Use Value: Symmetrical 30.5 V clamping prevents latch-up in transceivers such as SN65HVD230 while maintaining signal integrity up to 10 Mbps. |
| LED Driver Input Stage | On-board DC/DC Converter Input |
Use Scenario: Overvoltage protection for constant-current LED drivers powered from 24 V industrial buses. IC Role / Device Role / Timing Role: Primary surge clamp at driver input, upstream of input capacitors and controller ICs. Use Value: Withstands repetitive 400 W pulses without degradation, supporting >100,000 surge cycles in outdoor lighting applications. | Use Scenario: Input rail protection for point-of-load buck converters in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Front-end TVS absorbing switching noise and back-EMF from adjacent relay coils. Use Value: Low 1 µA leakage avoids loading 24 V standby rails; DO-214AC footprint enables compact layout near connector entry points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17CA (Bourns) | Same VWM/VBR/VC, but 600 W PPPM (10/1000 µs) in DO-214AA (SMB) package; 1.6× larger footprint. | Better suited for higher-energy transients; requires PCB layout revision due to larger body and lead spacing. | Select SMBJ17CA only if system-level testing shows 400 W insufficient for worst-case ISO 7637-2 Pulse 1 exposure. |
| SMCJ17CA (Littelfuse) | Same VWM/VBR/VC, 1500 W PPPM (10/1000 µs), DO-214AB (SMC) package; 2.5× larger than SMA. | Used where sustained surge energy exceeds 400 W - e.g., heavy-duty vehicle alternator output lines. | Choose SMCJ17CA only when validated test data confirms need for >1 kW surge capacity; otherwise, SMAJ17CA offers optimal size/power balance. |
Compared with SMBJ17CA and SMCJ17CA, SMAJ17CA provides the smallest footprint (DO-214AC) and tightest clamping (30.5 V) among 17 V bidirectional TVS diodes rated ≥400 W, making it ideal for space-constrained 12 V/24 V modules requiring automotive-grade transient immunity without overspec'ing package size.
Availability
SMAJ17CA is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor interfaces, and LED driver input stages requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMAJ17CA 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.
The SMAJ series was developed specifically for AEC-Q200-compliant, surface-mount transient suppression in automotive and industrial environments - emphasizing fast response, low leakage, and robust package reliability under thermal cycling and mechanical shock.
FAQ
What is the maximum clamping voltage of the SMAJ17CA under a 10/1000 µs surge?
The SMAJ17CA has a maximum clamping voltage (VC) of 30.5 V when subjected to a 13.1 A peak pulse current with a 10/1000 µs waveform. This value is guaranteed across temperature and lifetime, and directly determines the voltage stress imposed on downstream circuitry during surge events - critical for ensuring ICs like CAN transceivers or microcontrollers remain within their absolute maximum ratings. The SMAJ17CA achieves this while maintaining bidirectional symmetry and sub-1 ps response.
Is the SMAJ17CA suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMAJ17CA is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test profiles per its datasheet. Its 400 W peak pulse power rating, 30.5 V clamping, and –55 °C to +150 °C operating range align with automotive environmental and surge immunity requirements. It is commonly used in infotainment power inputs and body control module interfaces where bidirectional protection and DO-214AC SMT compatibility are essential. The SMAJ17CA's qualification includes moisture sensitivity level 1 and JESD201 Class 2 whisker resistance.
How does the bidirectional design of the SMAJ17CA affect its circuit implementation?
The SMAJ17CA's bidirectional construction eliminates polarity dependence - either terminal can be connected to the protected line, with the other tied to ground or reference. This simplifies layout in AC-coupled or floating systems (e.g., RS-485 buses) and avoids orientation errors during automated placement. Unlike unidirectional TVS diodes, the SMAJ17CA provides identical clamping behavior for both positive and negative transients, with symmetric VBR (18.9–20.9 V) and VC (30.5 V). No series blocking diode is needed, reducing BOM count and parasitic inductance.
What is the reverse leakage current specification for the SMAJ17CA at its working stand-off voltage?
The SMAJ17CA exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its 17 V working stand-off voltage (VWM) and tested at 25 °C. This ultra-low leakage minimizes quiescent power loss in battery-backed or energy-sensitive systems, such as always-on automotive sensors or IoT node power rails. Leakage remains well below 5 µA across its full operating temperature range (–55 °C to +150 °C), ensuring consistent performance in under-hood or industrial ambient conditions. The SMAJ17CA achieves this while retaining fast response and robust surge capability.
Does the SMAJ17CA require special handling or baking before reflow soldering?
No, the SMAJ17CA is rated at Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it has unlimited floor life and requires no pre-reflow baking. Its DO-214AC (SMA) package uses molding compound compliant with UL 94V-0 and matte tin-plated leads qualified to J-STD-002 for solderability. This allows direct placement into standard lead-free reflow profiles (e.g., JEDEC J-STD-020 Class 3) without dry-pack storage or humidity-controlled handling - streamlining manufacturing for high-volume automotive and industrial PCB assembly. The SMAJ17CA's MSL 1 rating is verified and documented in Taiwan Semiconductor's official datasheet revision U2102.
SMAJ17CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ17CA FAQ
1.How can I place an order for SMAJ17CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CA 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 SMAJ17CA reliable?
The price and inventory of SMAJ17CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17CA is usually 5 days.
3.What payment methods are accepted for SMAJ17CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CA?
SMAJ17CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CA 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 SMAJ17CA?
For technical support, including SMAJ17CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CA requirements.
6.How does Aetrix verify that SMAJ17CA is sourced from the original manufacturer or authorized distributors?
All SMAJ17CA 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 SMAJ17CA meets industry standards.
7.What is the process for return or replacement of SMAJ17CA?
All SMAJ17CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CA, 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 SMAJ17CA part is unused and in its original packaging.
Return procedure for SMAJ17CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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