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Taiwan Semiconductor Corporation SMAJ150A
- Part No.:
- SMAJ150A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150A.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,360
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Product details
Overview
SMAJ150A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 150 V working stand-off voltage (VWM), 167–185 V breakdown voltage (VBR) at 1 mA test current, 243 V maximum clamping voltage (VC) at 1.3 A peak impulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ150A datasheet, SMAJ150A pinout, SMAJ150A application, or SMAJ150A equivalent, key selection considerations include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, junction temperature derating above 25°C, unidirectional polarity marking, and compatibility with automated SMT placement on 1 W steady-state power-limited PCB layouts.
Technical Context
The SMAJ150A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and low leakage (<1 µA at VWM). Its fast response time (<1.0 ps from 0 V to VBR min) ensures effective suppression of nanosecond-scale transients in automotive and industrial power systems.
It is rated for -55°C to +150°C operating junction temperature, meets JESD201 Class 2 whisker resistance, and complies with RoHS and halogen-free (IEC 61249-2-21) requirements - confirming suitability for high-reliability, lead-free reflow assembly environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse voltage before clamping begins; defines safe operating DC rail margin. |
| VBR @ IT=1 mA | 167–185 V - Breakdown onset range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM=1.3 A | 243 V - Clamped voltage under 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform; supports ISO 7637-2 compliance up to 78 V VWM. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; minimizes standby power loss in high-impedance monitoring paths. |
| Package | DO-214AC (SMA) - Surface-mount outline with cathode band marking; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060 g. UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional configuration; enables clamping when cathode exceeds anode by ≥VBR. |
| Cathode | Reverse-biased terminal / transient input | Connected to protected line (e.g., 150 V rail); avalanche conduction occurs when voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Clamping voltage ≤243 V at 1.3 A | Provides defined overvoltage ceiling for downstream 250 V-rated components in 150 V systems. |
| Response time <1.0 ps | Enables suppression of ESD and fast-switching noise before sensitive ICs experience latch-up or damage. |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliant | Validated for automotive load-dump and inductive switching immunity without external filtering. |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against flyback spikes and cross-conduction transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input/output rails to clamp voltage excursions exceeding 150 V nominal. Use Value: Prevents cumulative degradation of SiC/GaN FETs and Schottky diodes by limiting peak reverse stress to ≤243 V during 400 W surges. | Use Scenario: Input rail protection in isolated 150 V-to-12 V DC/DC modules used in battery management and motor control subsystems. IC Role / Device Role / Timing Role: Standoff protector on high-voltage input node, absorbing coupled noise from adjacent switching stages. Use Value: Maintains system uptime by eliminating transient-induced reset faults in microcontrollers powered from regulated 12 V output. |
| Automotive Lighting Systems | Industrial Adapters |
Use Scenario: Surge suppression on LED driver inputs subjected to load dump (Pulse 5a) and jump-start conditions per ISO 16750-2. IC Role / Device Role / Timing Role: Primary-line TVS on 150 V bus feeding constant-current LED arrays in headlamp modules. Use Value: Survives 35 V/100 ms load dump pulses without parametric shift, verified per ISO 7637-2 Pulse 1/2a/2b/3a/3b. | Use Scenario: Input-stage protection in universal-input AC/DC adapters delivering 150 V DC for industrial sensors and actuators. IC Role / Device Role / Timing Role: Final-stage clamp after bridge rectifier and bulk capacitor, guarding against line surges and capacitor discharge transients. Use Value: Enables CE/UL certification by meeting EN 61000-4-5 Level 3 (2 kV line-earth) with no additional MOV or gas discharge tube. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150 | Higher clamping voltage (266 V vs. 243 V at same IPPM); wider VBR range (167–204 V). | Less margin for 250 V-rated downstream components; higher energy dissipation during clamping. | Select SMAJ150 only if tighter VBR tolerance is not required and clamping voltage margin permits. |
| SMBJ150A | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM rating. | Requires larger PCB footprint; suited for higher-energy transients where 400 W is marginal. | Choose SMBJ150A when board layout allows larger package and system-level surge testing exceeds 400 W limits. |
Compared with SMAJ150 and SMBJ150A, the SMAJ150A offers optimal balance of compact DO-214AC footprint, 243 V clamping ceiling, and ISO 7637-2 compliance - making it preferred for space-constrained automotive and industrial DC rails where precise voltage limiting is critical.
Availability
SMAJ150A is available at Aetrix Electronics and suitable for switching mode power supplies, automotive lighting systems, and industrial adapters requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMAJ150A 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, and protection devices since 1979.
The SMAJ series was developed specifically for surface-mount transient suppression in automotive and industrial power systems, emphasizing high surge robustness, tight parameter distribution, and compatibility with lead-free reflow processes.
FAQ
What is the maximum clamping voltage of SMAJ150A under standard test conditions?
The SMAJ150A has a maximum clamping voltage (VC) of 243 V when subjected to a 10/1000 µs waveform with a peak impulse current (IPPM) of 1.3 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuits during transient events. The SMAJ150A maintains this clamping performance across its specified operating temperature range, with derating applied above 25°C per the manufacturer's pulse derating curve.
Is SMAJ150A suitable for bidirectional transient protection?
No, SMAJ150A is a unidirectional TVS diode intended for DC rail protection where polarity is fixed. For bidirectional applications, Taiwan Semiconductor specifies the SMAJ150CA variant (with "CA" suffix), which provides symmetrical clamping in both directions. Using SMAJ150A in reverse-biased configurations beyond its specified VWM may result in premature conduction or failure. Always verify polarity alignment during PCB layout for SMAJ150A.
What packaging and reel quantity is offered for SMAJ150A?
SMAJ150A is supplied in DO-214AC (SMA) package on tape-and-reel format, with 7,500 units per reel. The device features matte tin-plated leads compliant with J-STD-002 solderability standards and meets JESD201 Class 2 whisker resistance requirements. This packaging supports high-speed automated placement and is qualified for lead-free reflow profiles up to 260°C peak temperature.
Does SMAJ150A meet automotive-grade reliability standards?
Yes, SMAJ150A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electrical disturbances and is rated for operation from -55°C to +150°C junction temperature. It also complies with J-STD-020 moisture sensitivity level 1 (unlimited floor life) and RoHS/halogen-free specifications. While not AEC-Q200 qualified out-of-box, its construction and test validation align with common automotive subsystem requirements for non-safety-critical power rail protection.
How does SMAJ150A compare to SMAJ150 in terms of electrical performance?
SMAJ150A offers tighter breakdown voltage tolerance (167–185 V vs. 167–204 V for SMAJ150) and lower clamping voltage (243 V vs. 266 V at 1.3 A), resulting in superior voltage limiting precision. Both share identical VWM (150 V), package (DO-214AC), and peak pulse power (400 W), but SMAJ150A's reduced VC improves safety margin for 250 V-rated downstream components. The "A" suffix denotes enhanced parameter consistency for critical applications.
SMAJ150A 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 1.3A
- 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)
SMAJ150A FAQ
1.How can I place an order for SMAJ150A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150A 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 reliable?
The price and inventory of SMAJ150A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150A is usually 5 days.
3.What payment methods are accepted for SMAJ150A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150A?
SMAJ150A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150A 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?
For technical support, including SMAJ150A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150A requirements.
6.How does Aetrix verify that SMAJ150A is sourced from the original manufacturer or authorized distributors?
All SMAJ150A 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 meets industry standards.
7.What is the process for return or replacement of SMAJ150A?
All SMAJ150A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150A, 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 part is unused and in its original packaging.
Return procedure for SMAJ150A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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