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Vishay General Semiconductor - Diodes Division SMAJ150A-E3/61
- Part No.:
- SMAJ150A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150A-E3/61.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,386
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Product details
Overview
SMAJ150A-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 150 V stand-off voltage (VWM), 167–185 V breakdown voltage (VBR) at 1 mA, 243 V maximum clamping voltage (VC) at 1.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in DC power rails and signal lines of industrial motor drives and automotive ECUs.
For engineers reviewing the SMAJ150A-E3/61 datasheet, SMAJ150A-E3/61 pinout, SMAJ150A-E3/61 application, or SMAJ150A-E3/61 equivalent, key selection criteria include clamping performance under 1.2 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, SMA (DO-214AC) package compatibility, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a shunt-clamping device that remains high-impedance below VWM (150 V) and rapidly transitions to low-impedance conduction above VBR (min 167 V), limiting transient voltages to ≤243 V at rated IPPM. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps).
The SMAJ150A-E3/61 is rated for non-repetitive 8.3 ms half-sine surge currents up to 40 A (IFSM), supports operation from –55 °C to +150 °C, and is optimized for surface-mount automated placement on PCBs with 0.2" × 0.2" copper pads per terminal to sustain its 400 W pulse rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 150 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin. |
| VBR (Breakdown Voltage) | 167–185 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on during transients above system rail. |
| VC (Clamping Voltage) | 243 V at IPPM = 1.2 A - Measured peak voltage across device during 10/1000 μs surge; determines protected circuit's max stress level. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V); 300 W (>78 V) - Sustained energy absorption capability with standard 10/1000 μs waveform per IEC 61000-4-5. |
| ID (Reverse Leakage) | ≤1.0 μA at 150 V - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard pad layout; dictates derating above 25 °C ambient. |
| Package | SMA (DO-214AC) - Industry-standard surface-mount outline with cathode band marking; compatible with JEDEC MS-012. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), RoHS-compliant (E3 suffix). Cathode indicated by black band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., VIN or signal); conducts surge current to ground when VAK > VBR. |
| Anode (unbanded end) | Reference / return path | Typically tied to system ground or low-impedance return; completes clamping path during overvoltage events. |
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. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping - critical for safeguarding 150 V-rated MOSFETs and gate drivers. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure per JESD22-A101. |
| MSL Level 1 rating | Supports single-reflow assembly without moisture sensitivity concerns; eliminates bake requirements pre-SMT. |
| AEC-Q101 qualification path | HE3 suffix variant available - validated for automotive powertrain and body electronics per stress test requirements. |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
Use Scenario: Protection of 150 V DC bus inputs against inductive kickback from IGBT gate drivers and relay coils. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed directly across input terminals to clamp transients <100 ns after onset. Use Value: Limits voltage excursions to ≤243 V, preventing damage to upstream DC-DC controllers rated for 200 V absolute max. |
Use Scenario: Surge suppression on 12 V battery-fed sensor supply lines exposed to load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Unidirectional TVS connected between sensor VCC and chassis ground to absorb 100 V/100 ms transients. Use Value: Maintains <1 μA leakage at 150 V, avoiding false triggering of low-power analog sensors during normal operation. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Input-stage protection of PoE-powered remote radio units subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device on 48 V DC input, coordinated with upstream GDT and series impedance. Use Value: Achieves 243 V clamping at 1.2 A enables coordination with secondary TVS stages to meet ITU-T K.21 heavy-duty requirements. |
Use Scenario: DC-link overvoltage suppression in solar string inverters where PV array open-circuit voltage reaches 1500 V, but auxiliary supplies operate at 150 V. IC Role / Device Role / Timing Role: Standoff-rated TVS on isolated 150 V auxiliary rail feeding gate drivers and MCU peripherals. Use Value: Withstands continuous 150 V DC while clamping switching spikes from SiC MOSFETs to safe levels for 16-bit ADC references. |
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-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and package. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU public infrastructure projects). | Choose M3/61 when halogen-free material declaration is contractually required; same footprint and performance. |
| 1.5SMC150A | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; RθJA = 60 °C/W vs. 120 °C/W. | Better thermal performance allows higher sustained surge duty cycles; requires larger PCB area (7.11 × 6.22 mm vs. 4.57 × 2.92 mm). | Select 1.5SMC150A only if board space permits and thermal derating at elevated ambient is critical; not drop-in compatible. |
Compared with SMAJ150A-E3/61, the M3/61 offers identical protection performance with halogen-free construction, while 1.5SMC150A trades compact size for superior thermal dissipation - making SMAJ150A-E3/61 optimal for space-constrained industrial and automotive modules needing verified RoHS compliance.
Availability
SMAJ150A-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive engine control units, telecom power feeds, and renewable energy inverters requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ150A-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, precision, and automotive-grade validation.
The SMAJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where consistent clamping performance and AEC-Q101 readiness are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ150A-E3/61 under standardized surge conditions?
The SMAJ150A-E3/61 exhibits a maximum clamping voltage (VC) of 243 V when subjected to its rated peak pulse current (IPPM) of 1.2 A using the 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the SMAJ150A-E3/61 suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ150A-E3/61 itself is commercial-grade; however, Vishay offers the functionally identical SMAJ150AHE3_A variant (with HE3 suffix) that is fully AEC-Q101 qualified. For automotive engine control units or body electronics, specify the HE3 version - it shares the same electrical characteristics, SMA package, and pinout as SMAJ150A-E3/61 but includes extended stress testing per AEC-Q101.
How does the thermal resistance of the SMAJ150A-E3/61 affect its surge handling capability at elevated ambient temperatures?
The SMAJ150A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on standard 0.2" × 0.2" copper pads. At 70 °C ambient, its usable peak pulse power derates to ~270 W - meaning sustained or repetitive surges must be reduced in amplitude or frequency to avoid exceeding TJ(max) = 150 °C. Derating curves in Figure 2 of the datasheet document this relationship precisely.
Can the SMAJ150A-E3/61 be used in bidirectional protection configurations?
No - the SMAJ150A-E3/61 is strictly unidirectional, as indicated by the "A" suffix and cathode band marking. For bidirectional protection at 150 V standoff, the correct variant is SMAJ150CA (e.g., SMAJ150CA-E3/61), which provides symmetrical clamping in both polarities and omits the polarity band. Using SMAJ150A-E3/61 in AC or floating applications risks failure due to forward conduction during negative transients.
What is the reverse leakage current specification for the SMAJ150A-E3/61 at its full stand-off voltage?
At its rated stand-off voltage of 150 V and TA = 25 °C, the SMAJ150A-E3/61 guarantees a maximum reverse leakage current (ID) of 1.0 μA. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in battery-backed systems - verified per the Electrical Characteristics table in the Vishay datasheet 88390.
SMAJ150A-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:
- 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-E3/61 FAQ
1.How can I place an order for SMAJ150A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150A-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 SMAJ150A-E3/61 reliable?
The price and inventory of SMAJ150A-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 SMAJ150A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ150A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150A-E3/61?
SMAJ150A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150A-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 SMAJ150A-E3/61?
For technical support, including SMAJ150A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150A-E3/61 requirements.
6.How does Aetrix verify that SMAJ150A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ150A-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 SMAJ150A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ150A-E3/61?
All SMAJ150A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150A-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 SMAJ150A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ150A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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