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Vishay General Semiconductor - Diodes Division SMAJ150A-E3/5A
- Part No.:
- SMAJ150A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150A-E3/5A.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ150A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 150 V standoff voltage (VWM), 167–185 V breakdown range (VBR at 1 mA), and clamps transients to ≤243 V at 1.2 A peak pulse current (IPPM) under 10/1000 μs waveform - deployed in automotive power supplies, industrial sensor interfaces, and telecom line protection.
For engineers reviewing the SMAJ150A-E3/5A datasheet, SMAJ150A-E3/5A pinout, SMAJ150A-E3/5A application, or SMAJ150A-E3/5A equivalent, key selection criteria include its 400 W peak pulse power rating (derated to 300 W above 78 V), low 1.0 μA max reverse leakage at VWM, and SMA (DO-214AC) package compatibility with automated SMT assembly.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device triggered by transient overvoltages exceeding its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ps), while the cathode-band polarity marking enables correct orientation during PCB layout.
The device complies with AEC-Q101 when ordered with HE3/HM3 suffixes (not applicable to SMAJ150A-E3/5A), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, limiting continuous power dissipation to 3.3 W at 50 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR (min/max) | 167 V / 185 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on across temperature and unit variation. |
| VC @ IPPM | ≤243 V at 1.2 A - Clamping voltage under 10/1000 μs surge; determines protected circuit's maximum transient stress. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power handling capability with 0.01% duty cycle; defines single-event surge survivability. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); relevant for accidental polarity reversal events. |
| TJ Range | −55 °C to +150 °C - Operating and storage junction temperature range; supports under-hood automotive and industrial environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on minimal pad layout; informs derating for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by a band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional conduction path) | Connected to lower-potential side of protected line; must be placed downstream of fuse or current-limiting impedance. |
| Cathode | Reverse-biased terminal (clamping node) | Connected to higher-potential side (e.g., VCC rail); carries full surge current during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12–48 V systems without external series impedance. |
| Glass-passivated junction | Ensures stable, repeatable avalanche behavior over lifetime and temperature; eliminates parameter drift from moisture or contamination. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving clamping precision. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk. |
| RoHS-compliant, commercial grade | Meets EU RoHS Directive 2011/65/EU; suitable for consumer, industrial, and non-automotive applications requiring environmental compliance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 16750-2) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground to clamp positive-going surges up to 100 V peak. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤243 V, preventing latch-up or gate oxide damage. |
Use Scenario: 4–20 mA current loop interface in PLC analog input modules subjected to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: TVS connected across signal and return lines to shunt transients before reaching op-amp front-end. Use Value: Maintains signal integrity by clamping <100 ns transients to <250 V, avoiding ADC saturation or amplifier saturation recovery delay. |
| Telecom DC Power Feeding | Consumer Device USB Port Protection |
|
Use Scenario: −48 V DC feeding circuits in base station remote radio units experiencing lightning-induced surges on power feed lines. IC Role / Device Role / Timing Role: Unidirectional TVS installed on negative rail relative to chassis ground to suppress negative transients. Use Value: Withstands 400 W pulses without degradation, enabling compliance with Telcordia GR-1089-CORE surge immunity requirements. |
Use Scenario: USB 2.0 data lines (D+/D−) in portable speakers exposed to human-body-model ESD during plugging/unplugging. IC Role / Device Role / Timing Role: Not applicable - SMAJ150A-E3/5A is rated for >150 V VWM; unsuitable for low-voltage signal-line protection. Use Value: Not applicable - this part is not selected for USB port protection due to excessive standoff voltage and lack of low-capacitance design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150A-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; used where halogen-free material compliance is mandated (e.g., certain industrial OEMs). | Select SMAJ150A-M3/5A when halogen-free bill-of-materials is required; otherwise SMAJ150A-E3/5A is standard. |
| SMAJ150AHE3_A/I | AEC-Q101 qualified version with same VWM, VBR, and PPPM; differs only in qualification testing and traceability. | Required for automotive electronics (e.g., body control modules) where component-level reliability validation is mandatory. | Choose SMAJ150AHE3_A/I for automotive-grade designs; SMAJ150A-E3/5A is appropriate for commercial/industrial use. |
Compared with SMAJ150A-M3/5A, the SMAJ150A-E3/5A offers identical surge performance but lacks halogen-free certification; compared with SMAJ150AHE3_A/I, it omits AEC-Q101 qualification testing - making it suitable for cost-sensitive, non-automotive applications requiring proven TVS functionality without extended reliability validation.
Availability
SMAJ150A-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC feeding applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for SMAJ150A-E3/5A 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 high-reliability, high-efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure tolerance and surge immunity are critical system requirements.
FAQ
What is the standoff voltage (VWM) of the SMAJ150A-E3/5A?
The SMAJ150A-E3/5A has a maximum reverse standoff voltage (VWM) of 150 V. This means it remains in high-impedance blocking mode for all reverse voltages up to 150 V, making it suitable for protecting 125 V DC systems with safety margin. The value is guaranteed per Vishay's datasheet revision 09-Jan-2024, Document Number 88390.
Does the SMAJ150A-E3/5A meet AEC-Q101 qualification?
No, the SMAJ150A-E3/5A is a commercial-grade RoHS-compliant part and does not carry AEC-Q101 qualification. For automotive applications requiring AEC-Q101, the designated variant is SMAJ150AHE3_A/I - which shares identical electrical parameters but undergoes additional stress testing and traceability controls. The SMAJ150A-E3/5A is intended for industrial and telecom use.
What is the clamping voltage (VC) of the SMAJ150A-E3/5A at its rated peak pulse current?
The SMAJ150A-E3/5A clamps to a maximum of 243 V at its specified peak pulse current (IPPM) of 1.2 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can the SMAJ150A-E3/5A be used for bidirectional transient protection?
No, the SMAJ150A-E3/5A is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, the equivalent part is SMAJ150CA (with "CA" suffix), which provides symmetrical clamping in both polarities. Using SMAJ150A-E3/5A in bidirectional configurations risks forward conduction and failure during negative transients.
What package type does the SMAJ150A-E3/5A use, and what are its mounting requirements?
The SMAJ150A-E3/5A uses the SMA (DO-214AC) surface-mount package - a low-profile, two-terminal outline with defined pad dimensions per Vishay's mechanical drawing. It requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated 400 W pulse power dissipation, and is compatible with standard SnPb and lead-free reflow profiles (MSL Level 1, 260 °C peak).
SMAJ150A-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 1.2A
- Power - Peak Pulse:
- 300W
- 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)
SMAJ150A-E3/5A FAQ
1.How can I place an order for SMAJ150A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150A-E3/5A 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 SMAJ150A-E3/5A reliable?
The price and inventory of SMAJ150A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ150A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150A-E3/5A?
SMAJ150A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150A-E3/5A 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 SMAJ150A-E3/5A?
For technical support, including SMAJ150A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150A-E3/5A requirements.
6.How does Aetrix verify that SMAJ150A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ150A-E3/5A 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 SMAJ150A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ150A-E3/5A?
All SMAJ150A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150A-E3/5A, 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 SMAJ150A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ150A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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