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Taiwan Semiconductor Corporation SMAJ150H
- Part No.:
- SMAJ150H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150H.pdf
- Description:
- TVS DIODE 150VWM 266VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,948
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Product details
Overview
SMAJ150H from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 150V working stand-off voltage (VWM), 167–204V breakdown voltage (VBR), and 266V clamping voltage (VC) at 1.1A peak impulse current. It delivers AEC-Q101 qualification, <1.0ps response time, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive power line protection.
For engineers reviewing the SMAJ150H datasheet, SMAJ150H pinout, SMAJ150H application, or SMAJ150H equivalent, this device is selected for robust overvoltage suppression in DC/DC converters, SMPS front-ends, and automotive body electronics where fast clamping, low leakage (<1µA @ 150V), and high surge immunity are required.
Technical Context
The SMAJ150H operates as a unidirectional avalanche diode, activated only under reverse-biased overvoltage transients. Its glass-passivated junction ensures stable VBR tolerance (±5% typical), while its 10/1000μs waveform-rated 400W peak pulse power supports high-energy ESD and load-dump events per ISO 7637-2.
Designed for operation from –55°C to +150°C junction temperature, it features matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Polarity is marked by cathode band; moisture sensitivity level is J-STD-020 Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 167 V / 204 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 266 V - Clamped voltage at 1.1 A peak impulse current (10/1000μs); limits downstream voltage stress |
| PPPM | 400 W - Peak pulse power handling capability; sustains automotive load-dump surges without failure |
| IR @ VWM | <1 µA - Ultra-low reverse leakage ensures minimal standby power loss in high-impedance circuits |
| Response time | <1.0 ps - Enables effective suppression of nanosecond-scale ESD and fast transients |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration, cathode indicated by molded band. Weight: 0.060 g. UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V/24V supply rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress requirements |
| Glass passivated junction | Ensures long-term parameter stability and resistance to humidity-induced degradation in harsh environments |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) waveforms |
| J-STD-020 Level 1 MSL | Zero floor-life limitation - can be mounted directly from reel without baking or dry-pack handling |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protecting LIN bus power rails and microcontroller I/O from battery load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between 12V supply and ground, activated within sub-nanosecond on overvoltage. Use Value: Limits transient voltage to ≤266V, preventing latch-up or damage to 3.3V/5V logic supplies downstream of LDOs. | Use Scenario: Safeguarding isolated flyback or buck converter inputs against 400V surge events in factory automation power systems. IC Role / Device Role / Timing Role: Primary overvoltage suppression device on primary-side DC bus, coordinated with MOV and fuse. Use Value: Absorbs 400W peak pulse energy without degradation, maintaining >10⁵ surge cycles per JEDEC standards. |
| LED Driver Power Supply | Telecom Power Interface |
Use Scenario: Shielding constant-current LED driver ICs from line transients induced by nearby relay switching in streetlight controllers. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 24–48V input rail, positioned upstream of input filter capacitors. Use Value: Maintains <1µA leakage at 150V, avoiding false triggering and enabling accurate current regulation. | Use Scenario: Front-end protection for PoE-powered remote units exposed to lightning-induced surges on 48V DC distribution lines. IC Role / Device Role / Timing Role: First-stage transient suppressor on DC input, preceding secondary TVS arrays and DC-DC regulators. Use Value: Clamps to 266V within <1ps, limiting stress on downstream 36V-rated MOSFETs and gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150AH | Narrower VBR range (167–185 V vs. 167–204 V); tighter 5% tolerance; same VWM, VC, and PPPM | Better suited for designs requiring precise clamping onset; identical footprint and thermal profile | Select SMAJ150AH when VBR consistency across production lots is critical for margin analysis |
| SMBJ150H | Same electrical specs but in larger DO-214AA (SMB) package; 600W PPPM rating (10/1000μs) | Higher power handling allows longer surge duration or higher repetition rates; requires PCB layout change | Choose SMBJ150H only if system-level surge testing exceeds 400W or thermal derating demands larger copper area |
Compared with SMAJ150AH, the SMAJ150H offers broader VBR tolerance for cost-sensitive designs, while SMBJ150H provides higher surge headroom at the expense of board space - neither is pin-compatible due to differing package outlines.
Availability
SMAJ150H is available at Aetrix Electronics and suitable for automotive electronics, industrial DC/DC converters, and LED lighting systems requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ150H 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, serving global automotive, industrial, and consumer markets since 1979.
The SMAJ series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient suppression in 12V/24V/48V automotive and industrial power networks.
FAQ
What is the maximum clamping voltage of the SMAJ150H under standard test conditions?
The SMAJ150H has a maximum clamping voltage (VC) of 266 V when subjected to its rated peak impulse current of 1.1 A using the 10/1000 μs waveform. This value is measured at TJ = 25°C and defines the upper voltage limit imposed on protected circuitry during transient events, ensuring downstream components remain within safe operating voltage margins.
Is the SMAJ150H suitable for bidirectional transient protection?
No, the SMAJ150H is a unidirectional TVS diode intended for reverse-biased clamping only. For bidirectional protection, Taiwan Semiconductor specifies devices with "CH" or "CAH" suffixes (e.g., SMAJ150CH). Using SMAJ150H in bidirectional configurations risks forward conduction and potential failure during positive transients.
Does the SMAJ150H require derating at elevated ambient temperatures?
Yes, the SMAJ150H must be derated above TA = 25°C per the pulse derating curve in Figure 2 of the datasheet. At 85°C ambient, its 400W peak pulse power rating drops to approximately 260W; at 125°C, it falls to ~140W. Designers must apply this derating when sizing for sustained high-temperature environments like engine compartments.
What is the marking code for the SMAJ150H on the device body?
The SMAJ150H is marked with the code "SL" on its package body, per the manufacturer's ordering and marking table. This two-character laser marking identifies the specific 150V variant within the SMAJxH family and is visible adjacent to the cathode band on the DO-214AC (SMA) case.
How does the SMAJ150H compare to standard 1N6267A-type TVS diodes?
The SMAJ150H replaces legacy through-hole 1N6267A with superior surface-mount compatibility, AEC-Q101 qualification, and tighter process control. While both share 150V VWM and similar clamping, SMAJ150H offers faster response (<1ps vs. ~1ns), lower IR (<1µA vs. ~5µA), and guaranteed ISO 7637-2 compliance - making it appropriate for modern automotive and industrial SMT production.
SMAJ150H 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:
- 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)
SMAJ150H FAQ
1.How can I place an order for SMAJ150H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150H 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 SMAJ150H reliable?
The price and inventory of SMAJ150H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150H is usually 5 days.
3.What payment methods are accepted for SMAJ150H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150H?
SMAJ150H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150H 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 SMAJ150H?
For technical support, including SMAJ150H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150H requirements.
6.How does Aetrix verify that SMAJ150H is sourced from the original manufacturer or authorized distributors?
All SMAJ150H 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 SMAJ150H meets industry standards.
7.What is the process for return or replacement of SMAJ150H?
All SMAJ150H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150H, 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 SMAJ150H part is unused and in its original packaging.
Return procedure for SMAJ150H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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