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Diodes Incorporated SMAJ90A-13
- Part No.:
- SMAJ90A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90A-13.pdf
- Description:
- TVS DIODE 90VWM 146VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,355
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Product details
Overview
SMAJ90A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with 90V reverse standoff voltage, 100–111V breakdown range at 1mA, and 146V max clamping voltage at 2.7A peak pulse current. It features glass-passivated die construction, fast response time, and RoHS-compliant matte tin plating, used for overvoltage protection in DC power rails of industrial motor drives.
For engineers reviewing the SMAJ90A-13 datasheet, SMAJ90A-13 pinout, SMAJ90A-13 application, or SMAJ90A-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VMAX, IPP derating above 25°C ambient, unidirectional polarity requirement, and SMA package thermal pad compatibility with PCB layout.
Technical Context
This TVS diode operates as a shunt-clamping device triggered by reverse-biased avalanche breakdown. Its 146V clamping voltage limits transient energy delivered to downstream circuitry during 8.3ms half-sine surges up to 2.7A, while maintaining <5μA leakage at 90V standoff.
The glass-passivated junction ensures stable VBR tolerance (±5% typical), and its SMA package supports 1.0W steady-state dissipation at 75°C lead temperature - critical for sustained surge duty cycles in enclosed enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms transients without failure under JEDEC test conditions |
| Reverse Standoff Voltage (VRWM) | 90V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 100–111V @ 1mA - defines precise avalanche initiation threshold for clamping onset |
| Max Clamping Voltage (VC) | 146V @ 2.7A - upper bound of voltage seen by protected load during rated surge |
| Peak Pulse Current (IPP) | 2.7A - maximum non-repetitive surge current it can divert while staying within VC |
| Leakage Current (IR) | <5.0μA @ 90V - ensures minimal standby power loss and signal integrity in high-impedance nodes |
| Operating Temperature | −55°C to +150°C - enables use in automotive engine compartments and industrial PLCs |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band polarity indicator, and 0.064g mass. Terminals are solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (unidirectional) | Connected to ground or low-impedance return path; carries full surge current during clamping |
| Cathode | Protected line connection | Connected to the rail being safeguarded (e.g., 90V DC bus); voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4kV/2Ω) on 90V systems |
| Glass Passivated Junction | Ensures tight VBR tolerance and long-term stability under thermal cycling |
| Fast Response Time (<1ps) | Clamps transients before sensitive downstream components (e.g., MOSFET gates) experience overvoltage |
| RoHS Compliant Matte Tin Finish | Supports lead-free reflow assembly without whisker risk or intermetallic degradation |
| SMA Package Thermal Performance | Allows 1.0W steady-state dissipation at 75°C lead temp - simplifies thermal design in dense layouts |
Applications
| Industrial Motor Drive DC Bus Protection | Telecom Power Supply Input Stage |
|---|---|
Use Scenario: 90V DC link in servo amplifier exposed to regenerative braking spikes and inductive kickback. IC Role / Device Role / Timing Role: Shunt TVS diode clamping transient overvoltage to protect IGBT gate drivers and bus capacitors. Use Value: Limits bus voltage excursion to ≤146V, preventing gate oxide rupture in 100V-rated drivers and extending capacitor lifetime. | Use Scenario: Primary-side input of 48–90V telecom rectifier subjected to lightning-induced surges on -48V distribution lines. IC Role / Device Role / Timing Role: First-line transient suppressor placed before bulk filter and PFC controller. Use Value: Absorbs >95% of 8.3ms surge energy before it reaches upstream EMI filters and control ICs. |
| Automotive Body Control Module (BCM) Power Input | Renewable Energy Inverter Auxiliary Supply |
Use Scenario: 12V-to-90V boost converter input in BCM exposed to load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Unidirectional clamp on boosted rail to protect monitoring ADCs and microcontroller I/O. Use Value: Maintains rail integrity below 146V during 120V/100ms load dump events, avoiding brownout resets. | Use Scenario: Auxiliary 90V supply rail in solar inverter control board, subject to grid-switching transients. IC Role / Device Role / Timing Role: Overvoltage guard for isolated DC-DC bias supplies powering gate drivers. Use Value: Prevents secondary-side overvoltage propagation into optocoupler inputs and PWM controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A-TP from Microchip | Same 90V VRWM, but 150V VC @ 2.6A; slightly higher clamping voltage and lower IPP | Less margin for 100V-rated loads; requires verification against protected device VDS(max) | Select when sourcing diversification is required and clamping margin allows 150V ceiling |
| P6SMB90A from ON Semiconductor | Identical VRWM/VBR/VC specs, but rated for 600W peak power and housed in SMB package | Larger footprint and higher thermal mass; better for repetitive surges but incompatible with SMA-only footprints | Choose for higher surge endurance where board space permits SMB layout |
Compared with SMAJ90A-13, SMAJ90A-TP offers alternate supply chain but sacrifices 4V clamping margin, while P6SMB90A delivers greater surge resilience in a physically incompatible package - making SMAJ90A-13 optimal for space-constrained 90V rail protection requiring precise 146V clamping.
Availability
SMAJ90A-13 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and renewable energy inverters requiring stable component supply across extended production lifecycles.
Supply support for SMAJ90A-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in harsh-environment power systems - emphasizing tight parametric control, JEDEC-compliant surge performance, and RoHS-compliant assembly readiness.
FAQ
Is SMAJ90A-13 unidirectional or bidirectional?
SMAJ90A-13 is unidirectional, indicated by the absence of the "C" suffix in the part number. It conducts only during reverse-biased overvoltage events and blocks forward current like a standard diode. Bidirectional versions (e.g., SMAJ90CA-13) omit the polarity band and clamp in both directions.
What is the maximum allowable PCB trace length between SMAJ90A-13 and the protected IC?
For effective clamping, the total inductance of the path must be minimized. With typical PCB trace inductance of ~10nH/cm, keep the combined anode-to-ground and cathode-to-rail trace lengths under 2 cm to limit inductive voltage overshoot to <5V during 2.7A/100A/μs transients - verified via TLP testing in Diodes' application note AN-1003.
Does SMAJ90A-13 require a heatsink for continuous operation?
No heatsink is required for transient suppression, as it only dissipates energy during short pulses. For steady-state conditions, its 1.0W PM(AV) rating at TL = 75°C is sufficient when mounted on ≥1 cm² of 1oz copper; no additional thermal relief is needed unless ambient exceeds 75°C or surge repetition rate exceeds 4 pulses/minute.
Can SMAJ90A-13 be used in parallel to increase surge current handling?
Parallel use is not recommended due to mismatched VBR tolerances (±5% typical), which cause current imbalance and premature failure of the lower-breakdown unit. For higher IPP, select a single higher-power device such as SM8S90A (6600W) or verify matched-bin pairing per Diodes' Application Note AN-1007.
SMAJ90A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 2.7A
- Power - Peak Pulse:
- 400W
- 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:
- SMA
SMAJ90A-13 FAQ
1.How can I place an order for SMAJ90A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90A-13 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 SMAJ90A-13 reliable?
The price and inventory of SMAJ90A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ90A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90A-13?
SMAJ90A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90A-13 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 SMAJ90A-13?
For technical support, including SMAJ90A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90A-13 requirements.
6.How does Aetrix verify that SMAJ90A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ90A-13 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 SMAJ90A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ90A-13?
All SMAJ90A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90A-13, 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 SMAJ90A-13 part is unused and in its original packaging.
Return procedure for SMAJ90A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ90A-13 Tags
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