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Vishay General Semiconductor - Diodes Division SMAJ150CA-E3/61
- Part No.:
- SMAJ150CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CA-E3/61.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,120
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Product details
Overview
SMAJ150CA-E3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 150 V standoff voltage (VWM), 167–185 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤243 V at 1.2 A peak pulse current (IPPM), with 400 W peak pulse power (10/1000 μs waveform). It is used in automotive power line protection, industrial sensor interfaces, and telecom signal line surge suppression.
For engineers reviewing the SMAJ150CA-E3/61 datasheet, SMAJ150CA-E3/61 pinout, SMAJ150CA-E3/61 application, or SMAJ150CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3 suffix variants), low leakage (<1.0 μA at VWM), and SMA (DO-214AC) package compatibility with automated SMT assembly.
Technical Context
This device operates as a voltage-clamped crowbar during transient events: when reverse voltage exceeds VBR, it avalanches into low-impedance conduction, diverting surge current away from protected circuitry. Its bidirectional symmetry ensures identical clamping behavior in both polarities - critical for AC-coupled or floating signal lines.
Thermal performance is defined by RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), enabling reliable operation up to TJ = +150 °C. The glass-passivated junction and MSL Level 1 rating (260 °C peak reflow) support high-yield, lead-free manufacturing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC RMS working margin. |
| VBR (min/max) | 167 V / 185 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across process variation. |
| VC @ IPPM | ≤243 V at IPPM = 1.2 A (10/1000 μs) - Clamped voltage seen by protected IC/MOSFET; determines residual stress on downstream components. |
| PPPM | 400 W - Peak transient energy absorption capacity; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage at rated standoff; avoids signal integrity degradation or battery drain in always-on systems. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD outline with 5.0 mm × 5.0 mm copper pad thermal design; supports JEDEC-compliant reflow. |
| TJ Range | −55 °C to +150 °C - Full industrial and automotive ambient operating envelope; validated for under-hood and outdoor deployment. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Identical bidirectional conduction; either terminal serves as input/output - no orientation required during placement. |
| Case (body) | Thermal and mechanical interface | Plastic-molded body meets UL 94 V-0; transfers heat to PCB copper pads per recommended 0.2" × 0.2" layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and ungrounded sensor outputs without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Withstands repetitive lightning-induced surges per IEC 61000-4-5; derates to 300 W above 78 V, maintaining robustness at high-VWM ratings. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD > 30 kV), improving protection margin for sub-5 V logic interfaces. |
| AEC-Q101 qualification option | HE3/HM3 variants meet automotive reliability standards - validated for temperature cycling, HTRB, and surge endurance in engine control modules. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT processes without pre-baking; eliminates moisture-related popcorning risk in high-volume manufacturing. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply rails in body control modules against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role: Primary clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤243 V during 120 V/350 ms load dump events, preventing latch-up or gate oxide damage in downstream PMICs. |
Use Scenario: Shielding analog output lines (4–20 mA, 0–10 V) of pressure/temperature transmitters from field wiring surges. IC Role / Device Role: Bidirectional shunt protector across signal and return paths in two-wire loop-powered sensors. Use Value: Maintains signal fidelity with <1.0 μA leakage at 150 V, while clamping induced spikes to safe levels for ADC front-end op-amps. |
| Telecom Signal Line Protection | Consumer USB/Display Port ESD Guard |
|
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul links exposed to induced lightning surges on long cable runs. IC Role / Device Role: Common-mode TVS across differential pair (A/B) and ground, leveraging bidirectional symmetry. Use Value: Achieves <1 ns response time and ≤243 V clamping to preserve signal integrity up to 20 Mbps, meeting Telcordia GR-1089-CORE. |
Use Scenario: Adding secondary surge immunity to USB 2.0 data lines in smart displays, supplementing internal ESD diodes. IC Role / Device Role: Low-capacitance (<50 pF typical) bidirectional clamp placed between D+/D− and chassis ground. Use Value: Adds 400 W transient handling beyond built-in 8 kV HBM protection, enabling compliance with IEC 61000-4-2 Level 4 (15 kV air). |
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-E3/61 | Unidirectional variant; cathode-marked; VF = 3.5 V at 25 A forward current. | Requires correct polarity placement; unsuitable for AC or floating lines. | Select only when protecting DC rails with known polarity and where forward conduction must be minimized. |
| SMBJ150CA-E3/52 | Same VWM/VBR/VC specs but in SMB (DO-214AA) package; 400 W rating, higher IPPM (1.3 A). | Larger footprint (3.94 mm × 4.57 mm vs. 4.50 mm × 2.79 mm); better thermal dissipation on large copper areas. | Choose when board space allows larger package and higher surge margin is needed for harsher environments. |
Compared with SMAJ150CA-E3/61, the unidirectional SMAJ150A-E3/61 requires strict polarity alignment and lacks AC-line suitability, while the SMBJ150CA-E3/52 trades compactness for enhanced thermal mass and surge headroom - making SMAJ150CA-E3/61 optimal for space-constrained bidirectional protection.
Availability
SMAJ150CA-E3/61 is available at Aetrix Electronics and suitable for automotive infotainment power conditioning, industrial PLC analog I/O protection, and telecom base station signal line hardening requiring stable component supply across multi-year production cycles.
Supply support for SMAJ150CA-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 manufacturability.
The SMAJ series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and communications systems - delivering standardized TVS performance in compact, RoHS-compliant SMD packages.
FAQ
What is the clamping voltage of SMAJ150CA-E3/61 at its rated peak pulse current?
The SMAJ150CA-E3/61 clamps to a maximum of 243 V when subjected to its specified peak pulse current of 1.2 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage imposed on protected circuitry during a surge event - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The SMAJ150CA-E3/61 achieves this with low dynamic impedance, minimizing overshoot.
Is SMAJ150CA-E3/61 suitable for automotive applications?
Yes, SMAJ150CA-E3/61 is compatible with automotive use, and AEC-Q101 qualified versions are available under the HE3 and HM3 suffixes (e.g., SMAJ150CAHE3_A). While the base SMAJ150CA-E3/61 is commercial-grade, its −55 °C to +150 °C operating junction temperature range, robust surge capability, and MSL Level 1 reflow rating align with under-hood and cabin module requirements. For certified automotive deployment, specify the HE3 variant to ensure full qualification testing per AEC-Q101.
How does the bidirectional design of SMAJ150CA-E3/61 affect PCB layout?
The bidirectional design of SMAJ150CA-E3/61 eliminates polarity constraints - there is no cathode band or marking, so the device can be placed in either orientation on the PCB without functional impact. This simplifies automated pick-and-place programming and reduces assembly errors in high-mix production. Layout must still follow the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal to maintain thermal performance and achieve the rated 400 W pulse power. The SMAJ150CA-E3/61's symmetry makes it ideal for differential or floating signal paths.
What is the maximum reverse leakage current for SMAJ150CA-E3/61 at its standoff voltage?
The maximum reverse leakage current (ID) for SMAJ150CA-E3/61 is 1.0 μA when biased at its rated standoff voltage of 150 V and tested at 25 °C. This ultra-low leakage ensures minimal power loss and signal distortion in always-on or battery-powered systems - especially critical in precision analog sensing and low-power IoT nodes. Leakage remains well below 10 μA even at elevated temperatures up to 125 °C, preserving system efficiency across the full operating range of the SMAJ150CA-E3/61.
Can SMAJ150CA-E3/61 replace SMAJ150A-E3/61 in an existing design?
No - SMAJ150CA-E3/61 cannot be a direct drop-in replacement for SMAJ150A-E3/61 without layout review, because the "CA" suffix denotes bidirectional operation while "A" indicates unidirectional. The SMAJ150A-E3/61 has a cathode band and conducts only in reverse bias; substituting the bidirectional SMAJ150CA-E3/61 may cause unintended forward conduction in DC circuits. However, if the application involves AC, differential, or polarity-agnostic protection (e.g., RS-485), the SMAJ150CA-E3/61 is functionally superior - but requires verification that forward voltage drop and leakage meet system requirements.
SMAJ150CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ150CA-E3/61 FAQ
1.How can I place an order for SMAJ150CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CA-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 SMAJ150CA-E3/61 reliable?
The price and inventory of SMAJ150CA-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 SMAJ150CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ150CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CA-E3/61?
SMAJ150CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CA-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 SMAJ150CA-E3/61?
For technical support, including SMAJ150CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ150CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ150CA-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 SMAJ150CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ150CA-E3/61?
All SMAJ150CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CA-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 SMAJ150CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ150CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ150CA-E3/61 Tags
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