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Taiwan Semiconductor Corporation SMAJ150AH
- Part No.:
- SMAJ150AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150AH.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,913
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Product details
Overview
SMAJ150AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 150V working stand-off voltage (VWM), and clamping voltage of 243V at 1.3A peak impulse current - deployed in automotive DC/DC converters to protect sensitive power management ICs from load dump and ISO 7637-2 Pulse 1/2a/2b transients.
For engineers reviewing the SMAJ150AH datasheet, SMAJ150AH pinout, SMAJ150AH application, or SMAJ150AH equivalent, key selection criteria include clamping performance under 10/1000μs surge, AEC-Q101 qualification status, unidirectional polarity marking, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on high-reliability automotive PCBs.
Technical Context
The SMAJ150AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its breakdown range of 167–185V at 1mA test current. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.3μA at 150V), while fast response time (<1.0ps) enables effective suppression of ESD and fast-rising transients.
It complies with ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), and is rated for operation across –55°C to +150°C junction temperature - making it suitable for under-hood automotive environments where thermal derating and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before conduction begins; defines system bus voltage margin for safe operation. |
| VBR @ IT=1mA | 167–185 V - Breakdown voltage range ensuring reliable turn-on during overvoltage events without premature triggering. |
| VC @ IPPM=1.3A | 243 V - Clamping voltage at peak impulse current; determines maximum stress imposed on downstream circuitry during surge. |
| PPPM | 400 W (10/1000μs) - Peak pulse power rating; validates capability to absorb standardized automotive transients per ISO 7637-2. |
| IR @ VWM | <1.3 μA - Reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity in high-impedance nodes. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in engine compartment and other high-ambient automotive locations. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with cathode band marking; compatible with JEDEC MS-013 and J-STD-020 MSL Level 1. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end; weight ≈ 0.060g; meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / low-side reference | Connected to ground or low-impedance return path; forms current loop with cathode during clamping. |
| Cathode (banded end) | Reverse-biased terminal / protected line connection | Connected to the line being protected (e.g., 12V rail); conducts avalanche current to ground when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for front-end power protection in OEM ECUs. |
| Glass passivated junction | Ensures stable electrical parameters over lifetime and improved resistance to humidity-induced degradation in harsh environments. |
| Clamping voltage ≤243V at 1.3A | Provides predictable overvoltage limiting for 12V/24V systems, enabling robust interface design with PMICs and microcontrollers rated ≤28V absolute max. |
| Response time <1.0ps | Enables suppression of sub-nanosecond ESD events (IEC 61000-4-2) and fast edge-induced ringing in switching regulators. |
| MSL Level 1 (per J-STD-020) | Allows unlimited floor life and standard reflow without baking - simplifies manufacturing for high-volume automotive SMT lines. |
Applications
| Automotive Load Dump Protection | On-Board DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V vehicle battery-fed electronics during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp transients up to ±120V. Use Value: Limits peak voltage seen by upstream PMICs to ≤243V, preventing latch-up or permanent damage during 100V/400ms surges. | Use Scenario: Safeguarding buck converter input stage against switching noise and coupled transients from adjacent high-current circuits. IC Role / Device Role: Transient suppressor mounted directly at DC/DC input pins to shunt fast-rising spikes before they reach controller ICs. Use Value: Maintains stable input voltage during 10/1000μs pulses up to 400W, preserving regulation accuracy and preventing false shutdowns. |
| Industrial SMPS Secondary Side | LED Driver Overvoltage Clamp |
Use Scenario: Securing secondary-side control logic in isolated AC/DC adapters exposed to reflected primary-side surges. IC Role / Device Role: Standoff-rated TVS connected across optocoupler supply or feedback divider to prevent misregulation. Use Value: Blocks >150V transients while drawing <1.3μA at nominal output, avoiding loading errors in precision feedback networks. | Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to open-circuit or hot-swap transients. IC Role / Device Role: Unidirectional clamp placed across driver output terminals to limit voltage during LED string disconnection. Use Value: Clamps to 243V within nanoseconds, protecting MOSFETs and sense resistors rated for ≤250V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150A | Same VWM/VBR specs but not AEC-Q101 qualified; higher IR (≤5μA vs. ≤1.3μA) and no ISO 7637-2 compliance documentation. | Restricted to commercial-grade power supplies and non-automotive industrial equipment. | Select only if AEC-Q101 and automotive transient standards are not required. |
| SMBJ150AH | Same electrical specs but in larger DO-214AA (SMB) package; 600W peak power rating (vs. 400W), higher thermal mass, and different pad layout. | Used where board space allows larger footprint and higher surge margin is needed (e.g., heavy-duty motor drives). | Choose when higher power handling or legacy SMB layout compatibility is prioritized over miniaturization. |
Compared with SMAJ150A and SMBJ150AH, the SMAJ150AH uniquely balances AEC-Q101 qualification, DO-214AC size constraints, and verified ISO 7637-2 compliance - making it the preferred choice for space-constrained, automotive-qualified 12V/24V power rail protection.
Availability
SMAJ150AH is available at Aetrix Electronics and suitable for automotive electronics, industrial switch-mode power supplies, and LED lighting systems requiring stable component supply with full traceability and lifecycle support.
Supply support for SMAJ150AH 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 is part of TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for robust, high-reliability protection in automotive power distribution and ECU subsystems.
FAQ
What is the breakdown voltage range of the SMAJ150AH?
The SMAJ150AH has a guaranteed breakdown voltage (VBR) range of 167V to 185V at 1mA test current, measured per JEDEC standards. This range ensures consistent turn-on behavior across production lots and temperature extremes, supporting reliable overvoltage protection in 12V/24V automotive systems where the SMAJ150AH is commonly applied.
Is the SMAJ150AH suitable for bidirectional transient suppression?
No - the SMAJ150AH is a unidirectional TVS diode, intended for use with clearly defined polarity (cathode connected to protected line). For bidirectional applications, Taiwan Semiconductor specifies the SMAJ150H variant (no "A" suffix) or parts with CH/CAH suffixes. Using SMAJ150AH in reverse-biased configurations risks failure due to lack of symmetric clamping capability.
Does the SMAJ150AH meet automotive qualification standards?
Yes - the SMAJ150AH is explicitly AEC-Q101 qualified and tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction includes glass-passivated junctions and MSL Level 1 packaging, confirming suitability for under-hood automotive deployment where SMAJ150AH is routinely specified.
What is the maximum clamping voltage of the SMAJ150AH under surge conditions?
The SMAJ150AH clamps to a maximum of 243V at its rated peak impulse current of 1.3A (10/1000μs waveform). This value is measured and guaranteed per datasheet specifications, defining the upper voltage limit imposed on protected circuitry during standardized surge events - a critical parameter when selecting SMAJ150AH for PMIC or microcontroller input protection.
Can the SMAJ150AH be used in high-humidity environments?
Yes - the SMAJ150AH features a glass-passivated chip junction and UL 94V-0 compliant molding compound, both contributing to high resistance against moisture-induced parameter drift or corrosion. Its J-STD-020 MSL Level 1 rating confirms zero floor-life restrictions, making SMAJ150AH appropriate for humid industrial or automotive under-hood applications without pre-bake requirements.
SMAJ150AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ150AH FAQ
1.How can I place an order for SMAJ150AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150AH 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 SMAJ150AH reliable?
The price and inventory of SMAJ150AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150AH is usually 5 days.
3.What payment methods are accepted for SMAJ150AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150AH?
SMAJ150AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150AH 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 SMAJ150AH?
For technical support, including SMAJ150AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150AH requirements.
6.How does Aetrix verify that SMAJ150AH is sourced from the original manufacturer or authorized distributors?
All SMAJ150AH 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 SMAJ150AH meets industry standards.
7.What is the process for return or replacement of SMAJ150AH?
All SMAJ150AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150AH, 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 SMAJ150AH part is unused and in its original packaging.
Return procedure for SMAJ150AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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