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Taiwan Semiconductor Corporation SMAJ15CA
- Part No.:
- SMAJ15CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15CA.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,380
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Product details
Overview
SMAJ15CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 15 V working stand-off voltage (VWM), 16.7–18.5 V breakdown voltage (VBR), and clamps transients to ≤24.4 V at 16.4 A peak impulse current (IPPM), delivering 400 W peak pulse power (10/1000 µs waveform) for automotive and industrial power supply surge immunity.
For engineers reviewing the SMAJ15CA datasheet, SMAJ15CA pinout, SMAJ15CA application, or SMAJ15CA equivalent, key selection criteria include its bidirectional configuration (CA suffix), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, <1.0 ps response time, <1 µA reverse leakage at VWM, and UL 94V-0 molding compound - all critical for reliable ESD and load-dump protection in compact, high-reliability PCB layouts.
Technical Context
The SMAJ15CA implements a glass-passivated silicon junction optimized for fast clamping of high-energy transients without thermal runaway. Its bidirectional structure enables symmetrical protection on AC-coupled or floating lines, with breakdown symmetry confirmed across both polarities per electrical specifications.
It operates within -55°C to +150°C junction temperature range and supports 40 A non-repetitive forward surge (8.3 ms half-sine), making it suitable for automotive battery line protection where load dump pulses exceed 100 V. Clamping performance is validated under standardized 10/1000 µs waveform testing per R.E.A. definition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 12 V systems. |
| VBR @ IT=1 mA | 16.7–18.5 V - Verified breakdown threshold ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM=16.4 A | 24.4 V - Clamped voltage during 400 W transient; limits downstream IC stress below 25 V absolute maximum ratings. |
| PPPM | 400 W (10/1000 µs) - Peak surge energy handling capacity sufficient for ISO 7637-2 Pulse 5a (load dump). |
| IR @ VWM | <1 µA - Negligible standby leakage, preserving efficiency in always-on 12 V monitoring circuits. |
| Response Time | <1.0 ps - Enables suppression of nanosecond-scale ESD and switching noise before sensitive circuitry reacts. |
| Package | DO-214AC (SMA) - Surface-mount footprint (4.5 × 2.7 mm) compatible with automated placement and reflow soldering. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation means band denotes common reference point, not unidirectional anode/cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Bidirectional terminal pair | Identical electrical behavior in both directions; band serves as mechanical orientation marker only - no functional polarity. |
| Case / Body | Non-conductive housing | No thermal or electrical connection to die; provides mechanical support and UL 94V-0 flame resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated protection against conducted transients in automotive 12 V systems including battery disconnect spikes and inductive switching noise. |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement prior to reflow; supports standard SMT assembly without moisture-related popcorning risk. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained industrial and automotive applications. |
| 40 A IFSM surge rating | Withstands 8.3 ms half-sine surges up to 40 A, enabling use in high-current DC/DC converter input stages. |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of head unit MCUs and audio codecs against load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of LDO regulators and EMI filters. Use Value: Limits clamped voltage to 24.4 V, staying within 25 V absolute max rating of PMICs and interface ICs while surviving 400 W pulses. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: Primary transient shunt at connector entry point, before optocoupler or Schmitt trigger input stage. Use Value: Sub-1 ps response ensures clamping initiates before 100 ns edge rates of relay coil transients propagate into logic circuitry. |
| LED Driver Constant-Current Supply | On-Board DC/DC Converter Input |
Use Scenario: Overvoltage protection for constant-current LED drivers in streetlight and signage applications subject to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input to absorb line-to-ground transients. Use Value: 400 W peak power rating handles multi-cycle surge events without degradation, supporting IP67-rated outdoor enclosures. |
Use Scenario: Input-side surge suppression for isolated 48 V-to-12 V DC/DC modules in telecom and server power distribution units. IC Role / Device Role / Timing Role: First-line defense against back-fed transients from downstream loads or hot-swap events. Use Value: 15 V VWM allows safe operation with 12 V nominal input while providing 9.4 V overhead margin before clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A (Taiwan Semiconductor) | Unidirectional; same VWM/VBR/VC specs but asymmetric conduction - conducts only in reverse direction. | Requires correct polarity placement; unsuitable for AC-coupled or floating signal lines. | Select SMAJ15A only when protecting unidirectional DC rails with known polarity and no reverse-voltage risk. |
| SMBJ15CA (Littelfuse) | Same DO-214AA (SMB) package; 600 W PPPM rating (10/1000 µs); slightly higher VC = 24.8 V at 24.7 A. | Larger footprint (4.6 × 3.9 mm) requires PCB layout change; higher power suits more severe surge environments. | Choose SMBJ15CA when system-level surge testing exceeds 400 W requirements or when existing design uses SMB package. |
Compared with SMAJ15A, SMAJ15CA provides polarity-agnostic protection essential for differential bus lines; versus SMBJ15CA, it offers identical clamping performance in a smaller DO-214AC footprint - ideal for space-constrained automotive modules where 400 W surge immunity suffices.
Availability
SMAJ15CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and LED driver power supplies requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ15CA 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, and power MOSFETs for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant, high-reliability transient suppression in 12 V/24 V automotive and harsh-environment industrial power systems - emphasizing fast response, low leakage, and robust surge endurance.
FAQ
What does the 'CA' suffix indicate in SMAJ15CA?
The 'CA' suffix in SMAJ15CA denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both forward and reverse directions. Unlike unidirectional variants (e.g., SMAJ15A), SMAJ15CA has no functional polarity - the cathode band serves only as a mechanical orientation marker. This makes SMAJ15CA suitable for protecting AC-coupled signals, floating grounds, or differential buses where voltage polarity may reverse.
Is SMAJ15CA compliant with automotive surge standards?
Yes, SMAJ15CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling and ignition noise). Its 400 W peak pulse power rating (10/1000 µs waveform), 150°C maximum junction temperature, and glass-passivated junction ensure robust performance in automotive 12 V battery line applications - including infotainment, body control, and ADAS subsystems where load dump and jump-start transients occur.
What is the maximum clamping voltage of SMAJ15CA under rated surge conditions?
The maximum clamping voltage (VC) of SMAJ15CA is 24.4 V at a peak impulse current (IPPM) of 16.4 A, tested with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures protected downstream components - such as 24 V-rated LDOs or microcontrollers - remain within their absolute maximum voltage ratings during transient events. The low VC reflects efficient silicon junction design and minimal series impedance.
Can SMAJ15CA be used in place of SMAJ15A in an existing design?
SMAJ15CA can replace SMAJ15A only if the circuit requires bidirectional protection - for example, on floating or AC-coupled nodes. However, SMAJ15A is unidirectional and will conduct only in reverse bias; substituting SMAJ15CA introduces symmetric conduction that may alter fault behavior in polarity-sensitive designs. No PCB changes are needed (same DO-214AC package), but functional validation is required to confirm compatibility with system-level surge paths and grounding schemes.
What is the moisture sensitivity level (MSL) and reflow profile for SMAJ15CA?
SMAJ15CA has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it is not moisture-sensitive and requires no baking prior to reflow soldering. It supports standard lead-free reflow profiles with peak temperatures up to 260°C. The device's matte tin-plated leads comply with J-STD-002 for solderability, and its UL 94V-0 molding compound withstands multiple reflow cycles without delamination or cracking - simplifying high-volume SMT manufacturing.
SMAJ15CA 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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)
SMAJ15CA FAQ
1.How can I place an order for SMAJ15CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15CA 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 SMAJ15CA reliable?
The price and inventory of SMAJ15CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15CA is usually 5 days.
3.What payment methods are accepted for SMAJ15CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15CA?
SMAJ15CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15CA 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 SMAJ15CA?
For technical support, including SMAJ15CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15CA requirements.
6.How does Aetrix verify that SMAJ15CA is sourced from the original manufacturer or authorized distributors?
All SMAJ15CA 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 SMAJ15CA meets industry standards.
7.What is the process for return or replacement of SMAJ15CA?
All SMAJ15CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15CA, 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 SMAJ15CA part is unused and in its original packaging.
Return procedure for SMAJ15CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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