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Taiwan Semiconductor Corporation SMAJ15C
- Part No.:
- SMAJ15C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15C.pdf
- Description:
- 400W, 18.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,183
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Product details
Overview
SMAJ15C from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 15V working stand-off voltage (VWM), 16.7–20.4V breakdown voltage (VBR), and 26.9V maximum clamping voltage (VC) at 14.9A peak pulse current - designed for overvoltage protection in DC/DC converters and SMPS input rails.
For engineers reviewing the SMAJ15C datasheet, SMAJ15C pinout, SMAJ15C application, or SMAJ15C equivalent, key selection criteria include clamping performance under 10/1000μs surge, unidirectional polarity marking, DO-214AC thermal derating above 25°C, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMAJ15C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (16.7–20.4V @ 1mA), clamping transients to ≤26.9V at 14.9A. Its glass-passivated junction ensures stable leakage (<1μA @ 15V) and fast response (<1.0ps).
It is rated for 400W peak pulse power (10/1000μs waveform), derated linearly above 25°C ambient per Fig.2, and supports steady-state power dissipation of 1W - suitable for single-pulse surge suppression in low-to-medium energy automotive and industrial power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC blocking threshold. |
| VBR min/max | 16.7 / 20.4 V @ 1 mA - Breakdown onset range; determines minimum surge trigger level and design margin. |
| VC @ IPPM | 26.9 V @ 14.9 A - Clamped voltage during 10/1000μs surge; sets worst-case protected circuit stress. |
| PPPM | 400 W - Peak pulse power handling (10/1000μs); defines survivable surge energy without failure. |
| IR @ VWM | <1 μA - Reverse leakage at 15V; ensures minimal standby power loss and signal integrity in high-impedance nodes. |
| TJ max | 150 °C - Maximum junction temperature; constrains PCB copper area and airflow requirements for thermal management. |
| Package | DO-214AC (SMA) - Surface-mount outline with cathode band marking; compatible with standard reflow profiles and J-STD-002 solderability. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end. Weight ≈0.060g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration. |
| Cathode (banded end) | Reverse-biased surge clamp terminal | Connected to protected line (e.g., +12V rail); conducts only during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Fast response time <1.0 ps | Clamps ESD and fast transients before downstream ICs experience overstress - critical for USB, CAN, and sensor interfaces. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching immunity without external filtering components. |
| Moisture sensitivity level 1 | 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 - required for export to EU, China, and Korea markets. |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC/DC input, clamping surges within 10/1000μs window. Use Value: Limits voltage to ≤26.9V during 14.9A surge, preventing damage to upstream regulators and microcontrollers. | Use Scenario: Safeguarding isolated 24V-to-5V DC/DC converter inputs in factory automation controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 100V/1A transients induced by nearby relay switching. Use Value: Maintains <1μA leakage at 15V, avoiding bias error in precision feedback networks while surviving 400W pulses. |
| SMPS Input Stage Clamp | LED Driver Surge Suppression |
Use Scenario: Secondary-side overvoltage clamp in offline AC/DC adapters with active PFC stages. IC Role / Device Role / Timing Role: Fast-acting unidirectional suppressor across bulk capacitor output, triggered after rectifier stage. Use Value: Clamps flyback spikes to 26.9V before they reach PWM controller VDD pin, eliminating need for Zener+RC snubbers. | Use Scenario: Transient protection on constant-current LED driver outputs exposed to cable disconnect events. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMAJ15C used in unidirectional mode with anode grounded, cathode on LED+ line. Use Value: Withstands 40A IFSM surge (8.3ms half-sine), enabling robustness against hot-plug and open-circuit arcs. |
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 | Narrower VBR range (16.7–18.5V vs. 16.7–20.4V); tighter 5% tolerance; same VC (24.4V @ 16.4A). | Better suited for designs requiring tighter clamping consistency across temperature and lot variation. | Select SMAJ15A when VBR distribution control is critical; SMAJ15C offers broader tolerance for cost-sensitive volume production. |
| SMBJ15C | Same electrical specs but in larger DO-214AA (SMB) package; higher thermal mass; 600W PPPM rating (10/1000μs). | Preferred where board space allows and higher surge margin or improved thermal derating is needed. | Choose SMBJ15C for enhanced reliability in high-temperature environments (>85°C ambient); SMAJ15C fits tighter layouts with adequate 400W margin. |
Compared with SMAJ15A, SMAJ15C trades tighter VBR tolerance for broader manufacturing acceptance and lower unit cost; versus SMBJ15C, it sacrifices 50% peak power headroom and thermal margin to achieve 30% smaller footprint in DO-214AC.
Availability
SMAJ15C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and SMPS input clamping requiring stable component supply and full traceability.
Supply support for SMAJ15C 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 surface-mount transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, high surge robustness, and automated assembly compatibility.
FAQ
What is the polarity configuration of the SMAJ15C?
The SMAJ15C is a unidirectional TVS diode, with cathode identified by a band on the DO-214AC package body. It conducts only when the cathode is at higher potential than the anode - ideal for protecting positive supply rails referenced to ground. This differs from bidirectional variants (e.g., SMAJ15CA), which lack polarity marking and suppress surges in both directions.
Does the SMAJ15C meet automotive-grade reliability standards?
Yes, the SMAJ15C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electrical disturbances, and is qualified to operate across –55°C to +150°C junction temperature. Its moisture sensitivity level 1 rating and JESD201 Class 2 whisker resistance further support use in automotive ECUs and under-hood modules.
What is the maximum clamping voltage of the SMAJ15C under surge conditions?
The SMAJ15C has a maximum clamping voltage (VC) of 26.9V at 14.9A peak pulse current (IPPM) under the standardized 10/1000μs waveform. This value is guaranteed across all units and represents the worst-case voltage seen by downstream circuitry during a full-rated surge event.
Can the SMAJ15C be used in bidirectional protection circuits?
No - the SMAJ15C is strictly unidirectional and must be installed with correct polarity (cathode toward protected line). For bidirectional protection, the SMAJ15CA variant is specified, with symmetrical VBR and clamping in both polarities. Using SMAJ15C in reverse-biased configurations risks permanent breakdown or failure.
How does the SMAJ15C's 400W rating scale with ambient temperature?
The SMAJ15C's 400W peak pulse power rating applies only at TA = 25°C. Above that, power capability derates linearly per Figure 2 in the datasheet: at 85°C ambient, it drops to approximately 240W; at 125°C, to ~120W. Layout with adequate copper pour and thermal vias is essential for sustained high-temperature operation.
SMAJ15C 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:
- 26.9V
- Current - Peak Pulse (10/1000µs):
- 14.9A
- 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)
SMAJ15C FAQ
1.How can I place an order for SMAJ15C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15C 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 SMAJ15C reliable?
The price and inventory of SMAJ15C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15C is usually 5 days.
3.What payment methods are accepted for SMAJ15C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15C?
SMAJ15C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15C 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 SMAJ15C?
For technical support, including SMAJ15C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15C requirements.
6.How does Aetrix verify that SMAJ15C is sourced from the original manufacturer or authorized distributors?
All SMAJ15C 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 SMAJ15C meets industry standards.
7.What is the process for return or replacement of SMAJ15C?
All SMAJ15C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15C, 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 SMAJ15C part is unused and in its original packaging.
Return procedure for SMAJ15C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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