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Taiwan Semiconductor Corporation SMAJ150CH
- Part No.:
- SMAJ150CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CH.pdf
- Description:
- TVS DIODE 150VWM 266VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,821
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Product details
Overview
SMAJ150CH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection in DC power lines. It features 150 V working stand-off voltage (VWM), 167–204 V breakdown voltage (VBR), 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 - meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b for vehicle electronics.
For engineers reviewing the SMAJ150CH datasheet, SMAJ150CH pinout, SMAJ150CH application, or SMAJ150CH equivalent, this device is selected for robust ESD and surge immunity in on-board DC/DC converters, lighting control modules, and SMPS input stages where bidirectional clamping, AEC-Q101 qualification, and sub-1 ps response time are critical design requirements.
Technical Context
The SMAJ150CH implements a glass-passivated silicon junction optimized for fast transient suppression in harsh automotive environments. Its bidirectional configuration enables symmetrical clamping in both polarities without external polarity management, and its 150 °C maximum junction temperature supports operation under high ambient conditions typical of engine bay or under-hood applications.
It delivers 266 V clamping voltage at 1.1 A IPPM under 10/1000 µs waveform, with <1 µA reverse leakage at 150 V, and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for lead-free reflow and high-reliability automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 167 V / 204 V at 1 mA test current - Ensures reliable turn-on above system operating voltage with margin |
| VC @ IPPM | 266 V at 1.1 A - Clamped voltage seen by protected circuit during 10/1000 µs surge |
| PPPM | 400 W (10/1000 µs) - Peak surge energy absorption capability per single event |
| IR @ VWM | <1 µA - Negligible leakage current at rated stand-off voltage, minimizing standby power loss |
| Response time | <1.0 ps - Enables effective suppression of nanosecond-scale transients like ESD and load dump spikes |
| Operating TJ | −55 °C to +150 °C - Fully rated for automotive under-hood and powertrain environments |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; bidirectional symmetry means no functional anode/cathode assignment - terminals are electrically identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked end) | Transient current entry point (bidirectional) | Same electrical role as cathode; polarity marking is mechanical only - device conducts identically in either direction |
| Cathode (band end) | Transient current exit point (bidirectional) | Same electrical role as anode; bidirectional construction eliminates directional dependency in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per stress test standard |
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating DC rails without polarity concerns or external diode pairing |
| ISO 7637-2 compliance | Guaranteed performance against standardized automotive transients (Pulse 1, 2a, 2b, 3a, 3b) without derating |
| Glass passivated junction | Provides stable VBR and low IR over lifetime, resisting moisture ingress and electrochemical degradation |
| Matte tin-plated leads | Ensures reliable solder wetting and compatibility with Pb-free reflow profiles per J-STD-002 |
Applications
| Automotive Lighting Control | On-Board DC/DC Converter Input |
|---|---|
Use Scenario: LED headlamp driver exposed to load dump and jump-start surges in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across input rail upstream of buck controller IC. Use Value: Limits transient voltage to ≤266 V, protecting 40 V-rated MOSFETs and gate drivers while maintaining AEC-Q101 compliance. |
Use Scenario: 48 V-to-12 V DC/DC module in ADAS domain controller subjected to ISO 7637-2 Pulse 1 (inductive switch-off). IC Role / Device Role / Timing Role: Bidirectional TVS shunting surge energy before input filter capacitor. Use Value: Clamps negative-going transients to −266 V and positive to +266 V, preserving input stage integrity without polarity-sensitive placement. |
| Industrial SMPS Front-End | LED Driver Power Supply |
Use Scenario: 300 W AC/DC adapter for factory automation equipment operating in electrically noisy plant environments. IC Role / Device Role / Timing Role: Secondary-side transient protector across output bus to safeguard downstream PLC I/O modules. Use Value: Absorbs 400 W surges with <1 µA leakage, preventing false triggering of undervoltage lockout in 150 V nominal output designs. |
Use Scenario: Constant-current LED driver for street lighting with long cable runs susceptible to induced lightning surges. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across LED string terminals to suppress differential-mode transients. Use Value: Maintains 150 V stand-off while clamping 10/1000 µs surges to 266 V, ensuring LED array survival under 1 kV/µs edge rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ150AHE3/5A | Unidirectional; 150 V VWM, 243 V VC @ 1.3 A; same DO-214AC package | Requires explicit polarity orientation; not suitable for AC or floating-rail protection | Select when polarity is fixed and lower clamping voltage is prioritized over bidirectional flexibility |
| ON Semiconductor SMAJ150CA | Bidirectional; 150 V VWM, 266 V VC @ 1.1 A; identical clamping and thermal specs | Same AEC-Q101 and ISO 7637-2 compliance; minor marking and date code format differences | Drop-in alternative with identical electrical and mechanical behavior - validated for cross-manufacturer substitution in automotive BOMs |
Compared with SMAJ150CH, the Littelfuse SMAJ150AHE3/5A offers tighter clamping but requires strict polarity-aware layout, whereas the ON Semiconductor SMAJ150CA matches all key parameters and qualifications - enabling seamless sourcing diversification without redesign or requalification.
Availability
SMAJ150CH is available at Aetrix Electronics and suitable for automotive lighting control, on-board DC/DC converter input protection, and industrial SMPS front-end designs requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 validation.
Supply support for SMAJ150CH 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 devices for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in automotive power networks, emphasizing robustness, repeatable clamping, and compatibility with modern lead-free SMT assembly processes.
FAQ
What does the "CH" suffix indicate in SMAJ150CH?
The "CH" suffix in SMAJ150CH denotes a bidirectional TVS diode with 150 V working stand-off voltage and AEC-Q101 qualification. Unlike unidirectional variants (e.g., SMAJ150H), the "C" confirms symmetrical clamping in both polarities, and the "H" indicates the high-power 400 W rating per 10/1000 µs waveform. This designation is standardized across Taiwan Semiconductor's SMAJ family.
Is SMAJ150CH compatible with lead-free reflow soldering?
Yes, SMAJ150CH is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the DO-214AC package is rated for peak reflow temperatures up to 260 °C. The device also complies with J-STD-020 Moisture Sensitivity Level 1, eliminating bake requirements prior to assembly.
How does SMAJ150CH perform under ISO 7637-2 Pulse 2b?
SMAJ150CH is explicitly rated to meet ISO 7637-2 Pulse 2b (inductive load disconnect, 100 V/2 Ω, 50 ms). Its 266 V clamping voltage ensures protected circuits remain below 300 V during this 100 V superimposed surge, satisfying the standard's immunity requirement without additional filtering or derating - confirmed in Taiwan Semiconductor's A2102 datasheet, page 3.
What is the maximum junction temperature for SMAJ150CH during surge events?
The maximum junction temperature for SMAJ150CH is 150 °C, as specified in the Absolute Maximum Ratings table. During a single 10/1000 µs 400 W surge, self-heating is transient and localized; steady-state thermal limits apply only to continuous power dissipation (1 W). The device's 150 °C TJ max enables reliable operation in under-hood automotive environments where ambient temperatures reach 125 °C.
Can SMAJ150CH replace SMAJ150AHE3/5A in an existing design?
No - SMAJ150CH cannot directly replace SMAJ150AHE3/5A without layout review. SMAJ150CH is bidirectional and polarity-insensitive, while SMAJ150AHE3/5A is unidirectional and requires correct anode/cathode orientation. Swapping them risks failure during negative transients. If replacing, verify schematic polarity, update footprint silkscreen, and revalidate clamping performance under bidirectional stress.
SMAJ150CH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ150CH FAQ
1.How can I place an order for SMAJ150CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CH 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 SMAJ150CH reliable?
The price and inventory of SMAJ150CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150CH is usually 5 days.
3.What payment methods are accepted for SMAJ150CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CH?
SMAJ150CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CH 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 SMAJ150CH?
For technical support, including SMAJ150CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CH requirements.
6.How does Aetrix verify that SMAJ150CH is sourced from the original manufacturer or authorized distributors?
All SMAJ150CH 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 SMAJ150CH meets industry standards.
7.What is the process for return or replacement of SMAJ150CH?
All SMAJ150CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CH, 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 SMAJ150CH part is unused and in its original packaging.
Return procedure for SMAJ150CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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