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Alpha & Omega Semiconductor Inc. SMDJ90A
- Part No.:
- SMDJ90A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ90A.pdf
- Description:
- 1CH 90V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:5,405
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Product details
Overview
SMDJ90A from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor diode (TVS) designed for high-energy surge protection in DC power lines and signal interfaces. It features a 90 V reverse standoff voltage (VRWM), 100–111 V breakdown voltage (VBR) at 1 mA, 146 V maximum clamping voltage (VC) at 20.6 A peak pulse current, and 3000 W peak pulse power dissipation on a 10/1000 µs waveform - deployed in industrial motor drives and telecom power supplies.
For engineers reviewing the SMDJ90A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 20.6 A surge, thermal resistance (RθJA = 75 °C/W), unidirectional polarity with cathode band marking, DO-214AB package compatibility, and compliance with J-STD-020 MSL Level 1.
Technical Context
The SMDJ90A operates as a silicon avalanche diode optimized for fast transient suppression. Its glass-passivated junction enables sub-nanosecond response time (<1.0 ps), while its low-profile DO-214AB package supports surface-mount board space efficiency and built-in strain relief for mechanical reliability.
Rated for -55 °C to +150 °C junction temperature, it delivers stable clamping across ambient conditions with a typical voltage temperature coefficient of 0.1% × VBR per °C change. Electrical characteristics are specified for unidirectional operation only, with cathode denoted by a color band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 90 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin. |
| VBR @ IT=1 mA | 100–111 V - Breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 146 V - Clamped voltage at 20.6 A peak pulse; limits downstream component stress during surge events. |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capacity; supports IEC 61000-4-5 Level 4 immunity testing. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient industrial environments. |
| RθJA | 75 °C/W - Thermal resistance to ambient on standard 8 mm × 8 mm copper pads; guides PCB thermal layout. |
| IR @ VRWM | 2.0 µA - Reverse leakage at rated standoff; ensures minimal standby power loss in high-impedance circuits. |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package with molded plastic case and matte tin lead-free plating. Cathode terminal identified by a color band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side of protected line; not used in normal TVS operation. |
| Cathode | Current exit point during reverse clamping | Marked with color band; connected to higher-potential side (e.g., VBUS); conducts surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of ESD and lightning-induced fast-rising transients before IC damage occurs. |
| Glass passivated junction | Improved long-term reliability and stable VBR over temperature and life cycle vs. epoxy-passivated alternatives. |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 260 °C peak without moisture-related popcorning. |
| UL 94V-0 flammability | Self-extinguishing plastic housing meets safety requirements for enclosed industrial equipment. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of DC bus inputs against load dump and inductive switching surges in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional TVS placed between DC+ and chassis ground to clamp transients exceeding 90 V. Use Value: Limits voltage to ≤146 V during 20.6 A surges, preventing gate oxide failure in IGBT drivers and DC-link capacitors. | Use Scenario: Input-stage surge protection on 48 V telecom rectifier outputs feeding base station backplanes. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 10/1000 µs surges per IEC 61000-4-5. Use Value: Maintains 2.0 µA leakage at 90 V, minimizing standby current draw while delivering 3000 W peak power handling. |
| Automotive Body Control Modules | Renewable Energy Inverters |
Use Scenario: CAN/LIN bus line protection and 12 V supply rail clamping in BCM ECUs exposed to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS on battery-fed rails to suppress load-dump spikes up to 120 V. Use Value: Withstands 150 °C junction temperature and exhibits 0.1% × VBR/°C drift, ensuring stable clamping across under-hood thermal cycles. | Use Scenario: DC-link overvoltage suppression in solar string inverters subjected to lightning-induced surges. IC Role / Device Role / Timing Role: High-power TVS mounted on heatsinked copper pads to dissipate 3000 W transient energy. Use Value: RθJL = 15 °C/W enables efficient heat transfer to PCB, supporting sustained reliability in outdoor-rated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC90A (Littelfuse) | Same DO-214AB package; VBR = 100–111 V, VC = 146 V, PPPM = 3000 W - identical electrical specs. | Identical unidirectional configuration and mounting; validated for same IEC 61000-4-5 test profiles. | Select when dual-sourcing required; SAC90A offers alternate logistics channel but no performance advantage. |
| 1.5KE91A (ON Semiconductor) | DO-201AD package; same VRWM (91 V), VBR (101–112 V), VC (146 V), PPPM (3000 W); higher RθJA (100 °C/W). | Larger footprint and axial-leaded form factor; unsuitable for high-density SMT layouts. | Choose only if legacy through-hole design or manual assembly constraints prohibit DO-214AB use. |
Compared with SMDJ90A, SAC90A provides identical clamping and thermal performance in the same package, while 1.5KE91A trades board space efficiency for legacy compatibility - making SMDJ90A optimal for new SMT designs requiring high power density and MSL-1 process support.
Availability
SMDJ90A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, RoHS-compliant packaging, and verified surge immunity performance.
Supply support for SMDJ90A 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 MOSFETs, TVS diodes, and power ICs for high-efficiency power conversion.
The SMDJ series was developed specifically for robust, high-power transient suppression in industrial and telecom infrastructure, emphasizing low clamping voltage, fast response, and surface-mount manufacturability.
FAQ
What is the maximum clamping voltage of the SMDJ90A under a 10/1000 µs surge?
The SMDJ90A has a maximum clamping voltage (VC) of 146 V when subjected to its rated peak pulse current of 20.6 A on a 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that downstream components experience no more than 146 V during defined surge events - a critical parameter for protecting 100 V-rated MOSFETs and controllers in the same circuit. The SMDJ90A maintains this clamping performance across its full operating temperature range.
Is the SMDJ90A suitable for bidirectional surge protection?
No, the SMDJ90A is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. For bidirectional applications - such as AC lines or differential data buses - the SMDJ90CA variant must be used instead. The SMDJ90A features a cathode band marking and conducts only in reverse breakdown; using it in reverse-biased AC configurations will result in forward conduction and device failure. Always verify polarity alignment before placing the SMDJ90A in-circuit.
What is the thermal resistance of the SMDJ90A, and how does it affect PCB layout?
The SMDJ90A 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. This value assumes standard JEDEC test conditions and directly informs minimum copper area requirements: reducing pad size increases RθJA, risking junction overheating during repeated surges. For high-duty-cycle applications, designers should also consider RθJL = 15 °C/W and use internal layers or thermal vias to enhance heat spreading - ensuring the SMDJ90A remains within its 150 °C TJ max limit.
Does the SMDJ90A meet lead-free and RoHS requirements?
Yes, the SMDJ90A is a green product per AOS policy: it is lead-free, RoHS compliant, and halogen-free, with matte tin lead finish meeting J-STD-020 MSL Level 1 reflow specifications (peak temperature 260 °C). Its DO-214AB package carries UL 94V-0 flammability rating, and all materials comply with EU Directive 2011/65/EU. Documentation confirming compliance is available in AOS' Green Policy document (AOSGreenPolicy.pdf), and the SMDJ90A is fully qualified for automated SMT assembly without special handling.
How does the SMDJ90A compare to older 1.5KE series TVS diodes?
The SMDJ90A replaces legacy through-hole 1.5KE91A with superior surface-mount integration: identical 3000 W PPPM and 146 V VC, but in a smaller DO-214AB package offering 25% lower RθJA (75 vs. 100 °C/W) and MSL Level 1 reflow compatibility. Unlike the 1.5KE series, the SMDJ90A uses glass passivation for tighter VBR tolerance and improved long-term stability. While electrically comparable, the SMDJ90A enables higher board density, automated placement, and better thermal performance - making it the preferred choice for new designs.
SMDJ90A 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):
- 90V
- Voltage - Breakdown (Min):
- 100V
- Voltage - Clamping (Max) @ Ipp:
- 146V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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
SMDJ90A FAQ
1.How can I place an order for SMDJ90A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ90A 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 SMDJ90A reliable?
The price and inventory of SMDJ90A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ90A is usually 5 days.
3.What payment methods are accepted for SMDJ90A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ90A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ90A?
SMDJ90A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ90A 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 SMDJ90A?
For technical support, including SMDJ90A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ90A requirements.
6.How does Aetrix verify that SMDJ90A is sourced from the original manufacturer or authorized distributors?
All SMDJ90A 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 SMDJ90A meets industry standards.
7.What is the process for return or replacement of SMDJ90A?
All SMDJ90A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ90A, 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 SMDJ90A part is unused and in its original packaging.
Return procedure for SMDJ90A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ90A Tags
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