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Alpha & Omega Semiconductor Inc. SMDJ150A
- Part No.:
- SMDJ150A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ150A.pdf
- Description:
- 1CH 150V UNIDIRECTIONAL 3000W SM
- Quantity:
- Payment:
- Shipping:
Inventory:9,185
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Product details
Overview
SMDJ150A from Alpha & Omega Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 150 V reverse stand-off voltage (VRWM), 167–185 V breakdown voltage (VBR) at 1 mA, 243 V maximum clamping voltage (VC) at 12.4 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform - deployed in industrial motor drives to protect IGBT gate drivers from inductive switching transients.
For engineers reviewing the SMDJ150A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (RθJA = 75 °C/W), unidirectional polarity confirmation, and DO-214AB package compatibility with automated SMT assembly.
Technical Context
The SMDJ150A operates as a silicon avalanche diode that enters controlled breakdown above its specified VRWM, diverting transient energy to ground while limiting voltage across downstream components. Its glass-passivated junction ensures stable VBR tolerance and low leakage (IR ≤ 2.0 µA @ 150 V).
Designed for non-repetitive 10/1000 µs surges up to 3000 W, it delivers sub-1 ps response time and supports 0.01% duty cycle operation. Thermal performance is characterized with RθJL = 15 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient) when mounted on 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 150 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system DC bus voltage margin. |
| VBR @ IT=1 mA | 167–185 V - Confirmed avalanche onset range; defines threshold for reliable transient conduction. |
| VC @ IPPM | 243 V - Clamped voltage at 12.4 A peak pulse; determines worst-case overvoltage seen by protected circuitry. |
| PPPM (10/1000 µs) | 3000 W - Peak transient energy handling capacity; enables robust protection against lightning-induced surges. |
| TJ max | +150 °C - Maximum junction temperature; constrains ambient and PCB thermal design for sustained reliability. |
| Polarity | Unidirectional - Cathode-banded device requiring correct orientation in series with positive rail or across supply rails. |
| Package | DO-214AB (SMC J-Bend) - Standardized surface-mount outline with J-bent leads; compatible with IPC-7351B footprint SMC. |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with matte tin lead-free plating, JEDEC-compliant mechanical outline, and cathode band marking polarity. Designed for reflow soldering per J-STD-020 MSL Level 1 (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or negative rail; forms return path during clamping event. |
| Cathode | High-side surge input node | Marked with color band; connects to protected line (e.g., +150 V DC bus); conducts avalanche current when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 243 V VC at 12.4 A ensures <10% overvoltage margin for 200 V-rated IGBT drivers. |
| Thermal robustness | RθJA = 75 °C/W enables operation up to +85 °C ambient with standard 8 mm² copper pads. |
| Fast response | Sub-1 ps turn-on time prevents voltage overshoot before protection engages. |
| Reliability construction | Glass-passivated junction and MSL Level 1 rating support high-yield automated assembly and long-term field stability. |
| Leakage control | IR ≤ 2.0 µA @ 150 V minimizes standby power loss in high-impedance monitoring circuits. |
Applications
| Industrial Motor Drive Protection | Telecom Power Supply Clamp |
|---|---|
Use Scenario: Protecting gate driver ICs in 150 V DC-link inverters from IGBT turn-off voltage spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between gate driver output and power ground to clamp transient excursions exceeding 200 V. Use Value: Limits voltage to 243 V during 3000 W surges, preventing gate oxide rupture in isolated gate drivers. | Use Scenario: Safeguarding DC-DC converter inputs in outdoor telecom base stations exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge shunt on 150 V backplane rail upstream of POL regulators and PMICs. Use Value: Absorbs 10/1000 µs transients without degradation, maintaining system uptime under IEC 61000-4-5 Level 4 stress. |
| Renewable Energy Inverter DC Bus | Test Equipment High-Voltage Interface |
Use Scenario: Clamping switching transients on photovoltaic string combiner box outputs feeding 150 V MPPT controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across PV+ and PV− terminals to suppress grid-coupling transients. Use Value: Withstands repetitive 0.01% duty cycle surges while maintaining VRWM stability over −40 to +125 °C operating range. | Use Scenario: Protecting analog front-end inputs of high-voltage oscilloscope modules rated for ±200 V full-scale. IC Role / Device Role / Timing Role: Input-stage crowbar device limiting fault voltage to safe levels during probe misconnection events. Use Value: Sub-1 ps response prevents damage to precision ADC input stages before overvoltage protection logic activates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC150A (Littelfuse) | Same DO-214AB package, identical VRWM (150 V), but higher VC = 250 V at 12.5 A; slightly lower PPPM (2500 W). | Marginally reduced clamping headroom; suitable where 7 V extra clamping voltage is acceptable. | Select when sourcing diversification is required and 250 V clamping remains within protected IC's SOA. |
| 1.5SMC150A (ON Semiconductor) | Identical electrical specs (VRWM = 150 V, VBR = 167–185 V, VC = 243 V), same DO-214AB package, but higher IR = 5.0 µA @ VRWM. | Higher leakage may impact ultra-low-power sensor bias networks. | Prefer for cost-sensitive designs where 5 µA leakage does not affect system accuracy or battery life. |
Compared with SAC150A and 1.5SMC150A, the SMDJ150A offers tighter leakage (≤2.0 µA), superior thermal resistance (RθJA = 75 °C/W vs. typical 85 °C/W), and guaranteed 3000 W surge capability - making it optimal for thermally constrained, high-reliability industrial power systems.
Availability
SMDJ150A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, renewable energy inverters, and test equipment requiring stable component supply with full traceability and lifecycle management.
Supply support for SMDJ150A 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power ICs for industrial, computing, and consumer markets.
The SMDJ series is engineered specifically for high-power transient suppression in harsh environments - emphasizing low clamping ratio, repeatable surge endurance, and automotive/industrial-grade reliability under thermal cycling and humidity stress.
FAQ
What is the maximum clamping voltage of the SMDJ150A under a 10/1000 µs surge?
The SMDJ150A exhibits a maximum clamping voltage (VC) of 243 V when subjected to its rated peak pulse current of 12.4 A on a 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMDJ150A maintains this clamping performance consistently across its qualified operating temperature range.
Is the SMDJ150A unidirectional or bidirectional?
The SMDJ150A is a unidirectional TVS diode, indicated by the "A" suffix and confirmed by its single cathode band marking. It conducts only when the cathode is biased positively relative to the anode - appropriate for DC rail protection where polarity is fixed. For bidirectional AC or floating-line protection, the SMDJ150CA variant must be used instead of the SMDJ150A.
What package type does the SMDJ150A use, and is it RoHS compliant?
The SMDJ150A uses the DO-214AB (SMC J-Bend) surface-mount package, with matte tin lead-free plating and compliance to RoHS Directive 2011/65/EU and halogen-free standards per AOS Green Policy. Its footprint aligns with IPC-7351B SMC land pattern, supporting automated pick-and-place and reflow assembly at peak temperatures up to 260 °C (MSL Level 1).
How does the SMDJ150A compare to the SMDJ150CA in terms of electrical behavior?
The SMDJ150A and SMDJ150CA share identical VRWM (150 V), VBR (167–185 V), and VC (243 V) ratings, but differ in polarity: the SMDJ150A is unidirectional (cathode-banded), while the SMDJ150CA is bidirectional (no polarity marking, symmetrical breakdown). Electrical characteristics apply in both directions for the CA version, enabling use in AC-coupled or differential signal paths where polarity reversal occurs.
What is the thermal resistance specification for the SMDJ150A, and how does it affect PCB layout?
The SMDJ150A has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under full 3000 W surge duty, PCB layout must provide adequate copper area and minimize trace length to ground planes. Reducing pad size or omitting thermal vias increases RθJA and risks thermal runaway during repeated surges.
SMDJ150A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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):
- 12.4A
- Power - Peak Pulse:
- 3000W (3kW)
- 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-214AB
SMDJ150A FAQ
1.How can I place an order for SMDJ150A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ150A 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 SMDJ150A reliable?
The price and inventory of SMDJ150A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ150A is usually 5 days.
3.What payment methods are accepted for SMDJ150A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ150A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ150A?
SMDJ150A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ150A 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 SMDJ150A?
For technical support, including SMDJ150A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ150A requirements.
6.How does Aetrix verify that SMDJ150A is sourced from the original manufacturer or authorized distributors?
All SMDJ150A 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 SMDJ150A meets industry standards.
7.What is the process for return or replacement of SMDJ150A?
All SMDJ150A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ150A, 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 SMDJ150A part is unused and in its original packaging.
Return procedure for SMDJ150A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ150A Tags
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