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Vishay General Semiconductor - Diodes Division SMAJ15-E3/61
- Part No.:
- SMAJ15-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15-E3/61.pdf
- Description:
- TVS DIODE 15VWM 26.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,512
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Product details
Overview
SMAJ15-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping transient overvoltages on power and signal lines. It features a 15 V stand-off voltage (VWM), 26.9 V maximum clamping voltage (VC) at 14.9 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ15-E3/61 datasheet, SMAJ15-E3/61 pinout, SMAJ15-E3/61 application, or SMAJ15-E3/61 equivalent, key selection criteria include its unidirectional polarity, 1.0 µA max reverse leakage at VWM, 16.7–20.4 V breakdown voltage range (VBR), 150 °C max junction temperature, and RoHS-compliant matte tin-plated leads solderable per J-STD-002.
Technical Context
This unidirectional TVS diode operates by avalanche breakdown to clamp transient voltages above its VWM threshold while maintaining low leakage (<1.0 µA) below that level. Its glass-passivated junction ensures stable performance and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The device is rated for 40 A non-repetitive forward surge current (IFSM) under 8.3 ms half-sine wave conditions and exhibits 30 °C/W typical junction-to-lead thermal resistance - critical for sustained surge handling in compact PCB layouts with 5.0 × 5.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins |
| VC @ IPPM | 26.9 V - Clamped voltage during 14.9 A 10/1000 µs surge, limiting stress on downstream components |
| IPPM | 14.9 A - Peak surge current capability with standard 10/1000 µs waveform |
| VBR min/max | 16.7 V / 20.4 V - Breakdown voltage range at 1.0 mA test current, defining turn-on consistency |
| Leakage ID | 1.0 µA max at VWM - Ensures minimal standby power loss and signal integrity in high-impedance circuits |
| PPPM | 400 W - Peak pulse power dissipation capacity, derated above 78 V to 300 W |
| TJ range | −55 °C to +150 °C - Operating and storage temperature range compatible with under-hood automotive and industrial environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-axis molded case with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); weight: 0.064 g; MSL Level 1 (260 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., VIN, signal trace); conducts during overvoltage to shunt energy to anode |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for sensitive ICs |
| MSL Level 1 rating | Allows uncompromised 260 °C lead-free reflow without preconditioning or baking |
| RoHS-compliant matte tin plating | Guarantees solderability per J-STD-002 and eliminates whisker risk (JESD201 Class 1A) |
| 400 W peak pulse power (10/1000 µs) | Provides robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply rails in engine control units (ECUs) and body control modules from load dump and alternator transients. IC Role / Device Role: Unidirectional TVS placed between battery rail and local regulator input to clamp surges up to ±100 V. Use Value: Limits clamped voltage to 26.9 V, preventing damage to 36 V-rated LDOs and microcontrollers downstream. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) in PLC I/O modules exposed to field wiring transients. IC Role / Device Role: TVS connected across output terminals to divert induced surges before reaching precision DAC or op-amp circuitry. Use Value: 1.0 µA leakage at 15 V ensures no measurable error in µA-level loop current accuracy. |
| Consumer Power Adapter Input | Telecom DC Power Feeding |
|
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for smart home devices subjected to mains-borne surges. IC Role / Device Role: Clamp diode installed across primary-side controller VCC capacitor to prevent latch-up during brownout recovery. Use Value: 150 °C max junction temperature supports operation in sealed enclosures with limited airflow. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from longitudinal surges on 48 V DC feeding lines. IC Role / Device Role: Unidirectional TVS on each conductor relative to common-mode reference to suppress differential-mode transients. Use Value: 400 W rating handles repetitive surges per IEEE 802.3bt Annex 132 requirements without degradation. |
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-E3/61 | Lower VBR range (16.7–18.5 V), tighter tolerance; 24.4 V VC at 16.4 A IPPM | Better suited for designs requiring lower clamping voltage and higher surge current margin at same VWM | Select when tighter VBR distribution and reduced VC are prioritized over absolute peak power rating |
| SMBJ15-E3/52 | Same VWM/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM | Higher power handling and thermal mass; requires larger PCB footprint | Choose for higher-reliability industrial systems where surge repetition rate or ambient temperature exceeds SMAJ15-E3/61 limits |
Compared with SMAJ15-E3/61, SMAJ15A-E3/61 offers improved clamping performance at the cost of slightly reduced surge current headroom, while SMBJ15-E3/52 trades board space for greater thermal robustness and surge endurance - making each optimal for distinct layout and reliability constraints.
Availability
SMAJ15-E3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer power adapters, and telecom PoE equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ15-E3/61 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in space-constrained surface-mount applications, targeting automotive, industrial, and communications systems where consistent clamping, low leakage, and reflow compatibility are essential.
FAQ
What is the polarity configuration of SMAJ15-E3/61?
SMAJ15-E3/61 is a unidirectional TVS diode, with the banded end indicating the cathode terminal. It conducts only during reverse overvoltage events - i.e., when the cathode is driven positive relative to the anode - and blocks normal forward bias. This configuration is ideal for DC power line protection where polarity is fixed, unlike bidirectional variants (e.g., SMAJ15CA) used in AC or floating signal paths. The SMAJ15-E3/61 datasheet confirms unidirectional operation in its PRIMARY CHARACTERISTICS table.
Does SMAJ15-E3/61 meet automotive qualification standards?
SMAJ15-E3/61 is RoHS-compliant and rated for MSL Level 1 reflow, but it is not AEC-Q101 qualified. For automotive-grade applications requiring formal qualification, Vishay offers the SMAJ15HE3/61 variant (with HE3 suffix), which is explicitly AEC-Q101 certified and built to high-reliability process controls. The SMAJ15-E3/61 datasheet distinguishes commercial-grade (E3) and automotive-grade (HE3) versions in its ORDERING INFORMATION section.
What is the maximum clamping voltage of SMAJ15-E3/61 under surge conditions?
The maximum clamping voltage (VC) of SMAJ15-E3/61 is 26.9 V, measured at its rated peak pulse current (IPPM) of 14.9 A using the standardized 10/1000 µs double-exponential waveform. This value is specified in the ELECTRICAL CHARACTERISTICS table for the SMAJ15 device type and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMAJ15-E3/61 maintains this clamping performance across its full operating temperature range.
Can SMAJ15-E3/61 be used in bidirectional signal line protection?
No - SMAJ15-E3/61 is strictly unidirectional and unsuitable for bidirectional signal lines such as USB, RS-485, or Ethernet pairs. Bidirectional protection requires symmetrical clamping in both polarities, provided only by CA-suffixed variants like SMAJ15CA. Using SMAJ15-E3/61 on a bidirectional line would result in unintended forward conduction during negative transients, potentially damaging the diode or distorting signals. The SMAJ15-E3/61 product documentation explicitly restricts its use to unidirectional applications.
What is the thermal resistance specification for SMAJ15-E3/61?
SMAJ15-E3/61 has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient resistance (RθJA) of 120 °C/W, measured on the standard 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pad layout per terminal. These values determine how effectively heat from surge events dissipates into the PCB - critical for sustaining repetitive surge duty cycles. The SMAJ15-E3/61 THERMAL CHARACTERISTICS table confirms both parameters under TA = 25 °C conditions.
SMAJ15-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ15-E3/61 FAQ
1.How can I place an order for SMAJ15-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15-E3/61 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 SMAJ15-E3/61 reliable?
The price and inventory of SMAJ15-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ15-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15-E3/61?
SMAJ15-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15-E3/61 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 SMAJ15-E3/61?
For technical support, including SMAJ15-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15-E3/61 requirements.
6.How does Aetrix verify that SMAJ15-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ15-E3/61 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 SMAJ15-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ15-E3/61?
All SMAJ15-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15-E3/61, 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 SMAJ15-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ15-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ15-E3/61 Tags
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