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Taiwan Semiconductor Corporation SMAJ150CA
- Part No.:
- SMAJ150CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CA.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,764
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Product details
Overview
SMAJ150CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 150 V working stand-off voltage (VWM), 167–204 V breakdown voltage (VBR @ 1 mA), 243 V maximum clamping voltage (VC) at 1.3 A peak impulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - suitable for automotive ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance.
For engineers reviewing the SMAJ150CA datasheet, SMAJ150CA pinout, SMAJ150CA application, or SMAJ150CA equivalent, key selection criteria include bidirectional clamping capability, DO-214AC (SMA) package compatibility with automated SMT placement, low leakage (<1 µA @ VWM), fast sub-1 ps response time, and moisture sensitivity level 1 handling per J-STD-020.
Technical Context
The SMAJ150CA implements a glass-passivated silicon junction optimized for high-energy transient suppression without degradation under repeated surge events. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating circuits, eliminating polarity concerns during layout.
It operates across –55 °C to +150 °C junction temperature range and maintains stable VBR and VC performance under derated conditions above 25 °C ambient, as defined by Fig.2 pulse derating curve. The device meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR min/max | 167 V / 204 V @ 1 mA - Verified breakdown threshold range ensuring reliable turn-on during transients. |
| VC @ IPPM | 243 V @ 1.3 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress exposure. |
| PPPM | 400 W - Peak pulse power handling per standard waveform; supports high-energy ESD and load-dump immunity. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life and minimizes standby power loss. |
| TJ max | +150 °C - Enables use in under-hood automotive modules and high-temperature industrial power supplies. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline compatible with IPC-7351B land patterns and reflow profiles. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation means both terminals are functionally symmetric; no anode/cathode distinction in circuit role).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Transient current path terminal | Bidirectional conduction - either terminal serves as current entry point during positive or negative surges; no polarity-dependent mounting required. |
| Case | Non-electrical mechanical interface | Plastic body provides insulation and thermal mass; no electrical connection or heatsinking function. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Ensures clamping activation before transient energy couples into sensitive downstream ICs. |
| ISO 7637-2 compliance | Pulse 1/2a/2b/3a/3b - Validated for automotive power line immunity including load dump and inductive switching noise. |
| Moisture sensitivity | Level 1 (J-STD-020) - No bake requirement prior to reflow; supports standard SMT assembly without special handling. |
| RoHS & halogen-free | Compliant per IEC 61249-2-21 - Meets environmental regulations for global electronics manufacturing and end-of-life processing. |
| Steady-state power dissipation | 1 W - Supports continuous operation in thermally constrained PCB areas without forced cooling. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 12 V/24 V vehicle ECUs against alternator load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input rail upstream of DC/DC regulators and microcontrollers. Use Value: Withstands 400 W pulses and clamps to ≤243 V, preventing damage to 36 V-rated input stages in automotive-grade PMICs and CAN transceivers. |
Use Scenario: Input rail protection in isolated 48 V-to-12 V industrial DC/DC modules used in factory automation controllers. IC Role / Device Role / Timing Role: Bidirectional TVS placed between primary-side bulk capacitor and converter input filter to absorb reflected surge energy. Use Value: 150 V VWM aligns with 48 V system derating margins; DO-214AC footprint allows compact placement near connector entry points. |
| LED Driver Power Inputs | Telecom Power Feeds |
Use Scenario: Surge protection on constant-current LED driver inputs exposed to outdoor lighting grid transients. IC Role / Device Role / Timing Role: First-line defense against lightning-induced surges on AC-DC adapter outputs feeding LED strings. Use Value: 243 V clamping voltage ensures downstream MOSFET gate drivers and current-sense amplifiers remain within absolute maximum ratings during 1 kV/2 kA surges. |
Use Scenario: Protection of PoE-powered equipment (e.g., IP cameras, wireless APs) on 48 V DC feed lines. IC Role / Device Role / Timing Role: Bidirectional clamp on midspan injector output to limit voltage excursions during cable ESD events and hot-plug transients. Use Value: Sub-1 µA leakage avoids loading PoE detection signature; 150 V VWM accommodates 48 V nominal with 2× safety margin and ripple tolerance. |
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 | Unidirectional; same VWM/VBR/VC specs but requires correct polarity orientation during placement. | Only suitable where circuit ground reference is fixed and surge polarity is known (e.g., single-rail SMPS outputs). | Select SMAJ150A only if board layout enforces strict polarity and system-level testing confirms unidirectional surge dominance. |
| SMBJ150CA | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating (vs. 400 W for SMAJ150CA). | Higher power handling supports longer-duration transients; requires larger PCB footprint and different land pattern. | Choose SMBJ150CA when surge test requirements exceed 400 W or thermal margin is critical; otherwise SMAJ150CA offers better space efficiency. |
Compared with SMAJ150A and SMBJ150CA, the SMAJ150CA uniquely balances bidirectional flexibility, DO-214AC space efficiency, and ISO 7637-2 compliance - making it optimal for compact automotive and industrial modules where polarity-agnostic protection and SMT scalability are mandatory.
Availability
SMAJ150CA is available at Aetrix Electronics and suitable for automotive ECUs, industrial DC/DC converters, and LED driver power inputs requiring stable component supply across extended production lifecycles.
Supply support for SMAJ150CA 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 high-reliability protection devices and power management components.
The SMAJ series was developed specifically for AEC-Q200-compliant automotive transient suppression and industrial-grade surge immunity, emphasizing robustness, consistency, and manufacturability in high-volume SMT environments.
FAQ
What does the 'CA' suffix indicate in SMAJ150CA?
The 'CA' suffix in SMAJ150CA denotes a bidirectional configuration - meaning the device clamps symmetrically for both positive and negative voltage transients without polarity dependence. This differs from 'A' suffix parts (e.g., SMAJ150A), which are unidirectional and require correct anode/cathode orientation. SMAJ150CA is therefore ideal for floating or AC-coupled circuits where surge polarity cannot be guaranteed, and its marking band has no functional significance in operation.
Does SMAJ150CA meet automotive qualification standards?
Yes, SMAJ150CA meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electrical disturbances, and its construction (glass-passivated junction, DO-214AC package, JESD201 Class 2 whisker resistance) supports AEC-Q200 stress testing. While TSC does not publish full AEC-Q200 reports for every variant, the SMAJ150CA shares the same die, process, and qualification baseline as AEC-Q200-qualified SMAJ family members - confirmed via TSC's U2102 datasheet revision and application notes.
What is the maximum clamping voltage of SMAJ150CA under surge conditions?
The maximum clamping voltage (VC) of SMAJ150CA is 243 V, measured at 1.3 A peak impulse current (IPPM) using the standardized 10/1000 µs double-exponential waveform. This value represents the upper limit of voltage seen by downstream circuitry during worst-case transient events and is guaranteed across the full operating temperature range (–55 °C to +150 °C), per the Electrical Specifications table in the U2102 datasheet.
Can SMAJ150CA replace SMAJ150A in an existing design?
SMAJ150CA can replace SMAJ150A electrically and mechanically - both share identical VWM, VBR, VC, package (DO-214AC), and soldering characteristics. However, SMAJ150CA is bidirectional while SMAJ150A is unidirectional, so no polarity marking alignment is needed. Layout changes are unnecessary, but verify that system-level surge behavior benefits from bidirectional clamping - especially in circuits with floating references or mixed-polarity transients.
What is the moisture sensitivity level (MSL) of SMAJ150CA?
SMAJ150CA has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it is not humidity-sensitive and may be stored indefinitely at ambient conditions without baking prior to reflow soldering. This eliminates MSL-related handling constraints, simplifies inventory management, and supports standard SMT assembly lines without dry-pack or floor-life tracking requirements - a key advantage over higher-MSL discrete protection devices.
SMAJ150CA 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ150CA FAQ
1.How can I place an order for SMAJ150CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CA 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 reliable?
The price and inventory of SMAJ150CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150CA is usually 5 days.
3.What payment methods are accepted for SMAJ150CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CA?
SMAJ150CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CA 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?
For technical support, including SMAJ150CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CA requirements.
6.How does Aetrix verify that SMAJ150CA is sourced from the original manufacturer or authorized distributors?
All SMAJ150CA 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 meets industry standards.
7.What is the process for return or replacement of SMAJ150CA?
All SMAJ150CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CA, 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 part is unused and in its original packaging.
Return procedure for SMAJ150CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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