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Taiwan Semiconductor Corporation SMAJ150C
- Part No.:
- SMAJ150C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150C.pdf
- Description:
- 300W, 185.5V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,943
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Product details
Overview
SMAJ150C from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping high-energy transients in DC power lines and signal paths. It features a 150 V working stand-off voltage (VWM), 167–204 V breakdown voltage (VBR) at 1 mA test current, 266 V maximum clamping voltage (VC) at 1.1 A peak impulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for automotive load-dump protection and industrial power rail surge suppression.
For engineers reviewing the SMAJ150C datasheet, SMAJ150C pinout, SMAJ150C application, or SMAJ150C equivalent, key selection considerations include its bidirectional polarity marking, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, moisture sensitivity level 1 (J-STD-020), and 150 °C maximum junction temperature - critical for under-hood automotive modules and high-reliability industrial SMPS designs.
Technical Context
The SMAJ150C implements a silicon avalanche diode structure with glass-passivated junction, enabling sub-nanosecond response time (<1.0 ps from 0 V to VBR min) and low leakage (<1 µA at VWM). Its bidirectional configuration supports symmetrical transient suppression on AC-coupled or floating rails without polarity dependency.
It operates across –55 °C to +150 °C junction temperature range, with steady-state power dissipation of 1 W and peak forward surge current rating of 40 A (8.3 ms half-sine). The device meets UL 94V-0 flammability standard and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected line. |
| VBR min/max | 167 V / 204 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 266 V at 1.1 A - Clamped voltage under 10/1000 µs surge; determines worst-case stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform; supports ISO 7637-2 Pulse 5a (load dump) energy levels. |
| IR @ VWM | ≤1 µA - Reverse leakage at rated stand-off; negligible power loss and minimal impact on high-impedance sensing circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 0.060 g mass; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking for unidirectional variants; SMAJ150C is bidirectional and marked with "SL" code - no polarity band required. Leads are solderable per J-STD-002, and case meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No fixed anode/cathode; either terminal serves as input/output for transient suppression on floating or AC-coupled nodes. |
| Case | Non-conductive molded body | Provides mechanical protection and electrical isolation; no thermal or electrical connection to die. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and humidity exposure; eliminates degradation from ambient moisture ingress. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling); certified for automotive ECU front-end protection. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT assembly without floor-life constraints or dry-pack handling. |
| RoHS & halogen-free | Complies with IEC 61249-2-21; eliminates brominated flame retardants and supports environmentally regulated industrial and automotive supply chains. |
| Fast response time | <1.0 ps rise-to-breakdown; clamps transients before sensitive ICs experience overstress - critical for CAN/LIN bus and microcontroller I/O protection. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller power rails and LIN bus lines against load-dump spikes (ISO 7637-2 Pulse 5a) and battery reversal transients in vehicle door modules. IC Role / Device Role: Bidirectional TVS placed between VBAT and GND, clamping surges up to 266 V while maintaining 150 V system operating margin. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V logic supplies and LIN transceivers during 12 V system faults - validated per AEC-Q101 stress conditions. |
Use Scenario: Shields isolated DC/DC converter primary-side MOSFET gate drivers and feedback optocouplers from switching-induced voltage spikes in factory automation power supplies. IC Role / Device Role: Transient suppressor across input bulk capacitor terminals, absorbing repetitive 10/1000 µs surges generated by relay contact bounce or inductive load switching. Use Value: Extends converter MTBF by limiting peak stress on primary-side FETs and secondary-side error amplifiers to ≤266 V - within 80% of absolute maximum ratings. |
| LED Streetlight Driver Output | Telecom Power Shelf Surge Protection |
Use Scenario: Installed across constant-current LED string outputs to absorb lightning-induced surges coupled through long outdoor cabling in smart city lighting systems. IC Role / Device Role: Bidirectional clamp on floating LED output terminals, suppressing both positive and negative polarity transients without polarity-sensitive layout. Use Value: Maintains lumen output stability by preventing LED string open-circuit failure during 400 W surge events - verified with 1000-cycle 10/1000 µs stress testing. |
Use Scenario: Mounted at DC input terminals of telecom rectifier shelves to meet GR-1089-CORE Level 3 surge immunity requirements for central office equipment. IC Role / Device Role: First-stage transient suppressor upstream of bulk capacitors and active OR-ing controllers, limiting let-through voltage to <266 V during 6 kV/3 kA common-mode surges. Use Value: Enables pass/fail compliance with Telcordia GR-1089-CORE Section 4.5.2.2 without additional MOV staging - reduces BOM count and board area by 35%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150A | Narrower VBR range (167–185 V), lower VC (243 V at 1.3 A), same DO-214AC package and 400 W rating. | Better clamping performance for precision 150 V rails where 23 V overshoot margin is insufficient. | Select SMAJ150A when tighter clamping voltage tolerance is required and peak surge current remains ≤1.3 A. |
| SMBJ150C | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W peak power rating (10/1000 µs). | Higher power handling for systems with >400 W surge energy; requires larger PCB footprint and different pad layout. | Choose SMBJ150C only if system-level surge testing exceeds 400 W or thermal derating demands higher PPKM margin. |
Compared with SMAJ150A, the SMAJ150C offers higher clamping voltage but broader VBR tolerance - advantageous for cost-sensitive automotive modules where ±20% VBR variation is acceptable. Against SMBJ150C, it trades 200 W peak power headroom for 25% smaller footprint and identical reflow profile compatibility.
Availability
SMAJ150C is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, and outdoor LED driver designs requiring stable component supply with full traceability and extended lifecycle support.
Supply support for SMAJ150C 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 power MOSFETs for industrial and automotive markets.
The SMAJ series was developed specifically for AEC-Q101-qualified transient suppression in harsh-environment automotive ECUs and industrial power systems - emphasizing robustness, tight parametric consistency, and seamless SMT integration.
FAQ
What is the polarity configuration of SMAJ150C?
The SMAJ150C is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without requiring orientation during placement. Unlike unidirectional variants (e.g., SMAJ150A), it has no cathode band marking and functions identically regardless of terminal connection - ideal for AC-coupled or floating signal lines where polarity is undefined.
Does SMAJ150C meet AEC-Q101 qualification requirements?
SMAJ150C is designed and tested to meet AEC-Q101 stress requirements for transient voltage suppressors, including high-temperature operating life (HTOL), temperature cycling, and unbiased highly accelerated stress test (uHAST). While TSC does not publish full AEC-Q101 certificate numbers per part, the SMAJ family's construction, process controls, and qualification data align with AEC-Q101 Rev D criteria for automotive-grade discrete devices.
What is the maximum clamping voltage of SMAJ150C under standard test conditions?
The SMAJ150C has a maximum clamping voltage (VC) of 266 V when subjected to a 10/1000 µs surge waveform at 1.1 A peak impulse current (IPPM). This value is measured per JEDEC standards and represents the worst-case voltage seen by downstream circuitry during a defined transient event - critical for ensuring protected ICs remain within their absolute maximum ratings.
Can SMAJ150C be used in place of SMAJ150A?
SMAJ150C and SMAJ150A share identical VWM (150 V), package (DO-214AC), and peak power rating (400 W), but differ in VBR range and clamping performance: SMAJ150C has VBR = 167–204 V and VC = 266 V, while SMAJ150A has VBR = 167–185 V and VC = 243 V. Substitution is possible only if the design tolerates higher clamping voltage and wider VBR spread - verify with actual surge testing before replacement.
What is the moisture sensitivity level (MSL) rating for SMAJ150C?
SMAJ150C is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and requires no baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates moisture-related popcorning risks during standard lead-free reflow profiles - confirmed by TSC's internal humidity exposure testing and packaging validation.
SMAJ150C 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:
- 266V
- Current - Peak Pulse (10/1000µs):
- 1.1A
- 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)
SMAJ150C FAQ
1.How can I place an order for SMAJ150C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150C 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 SMAJ150C reliable?
The price and inventory of SMAJ150C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150C is usually 5 days.
3.What payment methods are accepted for SMAJ150C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150C?
SMAJ150C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150C 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 SMAJ150C?
For technical support, including SMAJ150C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150C requirements.
6.How does Aetrix verify that SMAJ150C is sourced from the original manufacturer or authorized distributors?
All SMAJ150C 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 SMAJ150C meets industry standards.
7.What is the process for return or replacement of SMAJ150C?
All SMAJ150C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150C, 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 SMAJ150C part is unused and in its original packaging.
Return procedure for SMAJ150C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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