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Vishay General Semiconductor - Diodes Division SMAJ90A-M3/5A
- Part No.:
- SMAJ90A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90A-M3/5A.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ90A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 90 V standoff voltage (VWM), 100–111 V breakdown range (VBR at 1 mA), 146 V maximum clamping voltage (VC) at 2.1 A peak pulse current, and 400 W peak pulse power rating (10/1000 µs waveform). It is widely deployed to safeguard MOSFETs, microcontrollers, and sensor interfaces against inductive switching transients and ESD in industrial motor drives and automotive body electronics.
For engineers reviewing the SMAJ90A-M3/5A datasheet, SMAJ90A-M3/5A pinout, SMAJ90A-M3/5A application, or SMAJ90A-M3/5A equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) package compatibility with automated SMT assembly, AEC-Q101 qualification readiness (via HM3 suffix variants), and precise clamping performance under repetitive surge conditions up to 150 °C junction temperature.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 90 V, it avalanches into low-impedance conduction to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while the 30 °C/W junction-to-lead thermal resistance supports reliable power dissipation during transient events.
The device complies with ANSI/IEEE C62.35 surge standards and delivers repeatable clamping response within 1 ns, with incremental surge resistance optimized to minimize voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a). Its M3 suffix denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 90 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 100–111 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and unit variation |
| VC (Clamping Voltage) | 146 V at IPPM = 2.1 A - Peak voltage seen by protected IC during 10/1000 µs surge; directly limits stress on downstream components |
| PPPM (Peak Pulse Power) | 400 W (≤78 V); 300 W (>78 V) - Sustained surge energy handling per single event; derated above 25 °C per Fig. 2 |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - Unidirectional forward surge capability; supports inrush and fault-current limiting in DC power rails |
| TJmax | 150 °C - Maximum junction temperature; enables operation in under-hood automotive and high-ambient industrial environments |
| RθJL | 30 °C/W - Junction-to-lead thermal resistance; determines temperature rise under sustained power dissipation or repeated surges |
Pinout & Package
Package: SMA (DO-214AC) - Surface-mount plastic package with 2.54 mm lead pitch, 5.28 mm length, and 4.93 mm width; rated UL 94 V-0, compatible with standard reflow profiles and automated pick-and-place.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection (anode tied to ground) | Reverse-biased during normal operation; conducts only during overvoltage to shunt current to ground |
| Anode | Ground reference terminal | Provides low-inductance return path for surge current; must be connected to solid ground plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables protection against high-energy transients like load dump (ISO 16750-2) without derating below 78 V |
| 1 ns response time | Clamps sub-microsecond ESD and fast-switching noise before sensitive logic inputs are overstressed |
| Low incremental surge resistance | Minimizes VC overshoot during rapid di/dt events, improving margin for 3.3 V/5 V logic rails |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance requirements without compromising surge robustness |
| MSL Level 1 (260 °C peak) | Supports single-pass lead-free reflow without moisture-induced failure or delamination |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects microcontroller GPIOs and CAN transceiver power rails from load-dump spikes (up to 35 V) and inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 12 V supply and ground, with cathode to supply rail. Use Value: Limits transient voltage to ≤146 V, preventing latch-up or gate oxide damage in 3.3 V MCU peripherals during 100 ms load-dump events. |
Use Scenario: Shields 24 V digital input optocoupler circuits from field-wiring transients induced by relay coil de-energization or lightning coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted across input terminals, clamping reverse polarity and surge energy before signal conditioning stage. Use Value: Maintains <1 µA leakage at 24 V nominal, ensuring clean logic-level detection while surviving 400 W surges per IEC 61000-4-5 Combination Wave. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Front-End |
Use Scenario: Guards BLDC motor controller FET gates and bootstrap circuitry against back-EMF spikes during PWM commutation. IC Role / Device Role / Timing Role: Localized TVS on each high-side gate driver supply rail, cathode to VDD, anode to ground. Use Value: Clamps 100 ns rise-time spikes to <146 V, preserving gate oxide integrity and preventing false triggering of overvoltage protection circuits. |
Use Scenario: Provides secondary-level surge suppression on +48 V telecom rectifier output, downstream of primary MOV-based protection. IC Role / Device Role / Timing Role: Precision-clamping TVS in series with bulk capacitance to limit residual overshoot after primary clamp conduction. Use Value: Delivers 146 V clamping at 2.1 A with <0.1 % duty cycle tolerance, enabling tighter output voltage regulation and reduced capacitor derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free; uses matte tin plating without JESD201 Class 2 whisker mitigation | Approved for commercial-grade industrial use; not qualified for automotive under hood | Select when halogen-free requirement is not mandated and cost sensitivity outweighs AEC-Q101 readiness |
| SMAJ90CA-M3/5A | Bidirectional variant; identical VWM, VBR, and VC, but symmetrical conduction in both polarities | Required for AC-coupled signal lines or floating bus protection where polarity reversal may occur | Choose only if bidirectional clamping is needed; unidirectional SMAJ90A-M3/5A offers lower leakage and better DC bias stability |
Compared with SMAJ90A-E3/5A, the M3 version adds halogen-free compliance and whisker resistance for harsh environments; compared with SMAJ90CA-M3/5A, the unidirectional configuration provides superior reverse leakage control and avoids unnecessary conduction during normal negative excursions.
Availability
SMAJ90A-M3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and telecom power front-end designs requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMAJ90A-M3/5A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems-designed to meet stringent surge immunity standards while supporting automated manufacturing and extended temperature operation.
FAQ
What is the clamping voltage of the SMAJ90A-M3/5A under a 10/1000 µs surge?
The SMAJ90A-M3/5A exhibits a maximum clamping voltage (VC) of 146 V when subjected to a 10/1000 µs waveform at a peak pulse current (IPPM) of 2.1 A. This value is measured per ANSI/IEEE C62.35 and represents the upper voltage limit imposed on protected circuitry during standardized surge events. The SMAJ90A-M3/5A maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C), making it suitable for under-hood automotive and high-ambient industrial deployments.
Is the SMAJ90A-M3/5A suitable for automotive applications?
Yes-the SMAJ90A-M3/5A is halogen-free and RoHS-compliant per its M3 suffix, and it meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow requirements. While the base SMAJ90A-M3/5A itself is not AEC-Q101 qualified, Vishay offers the HM3-suffixed variant (e.g., SMAJ90A-HM3/5A) which carries full AEC-Q101 qualification. Engineers specifying SMAJ90A-M3/5A for automotive use should verify qualification status via the ordering code and consult Vishay's automotive-grade documentation for the HM3 version.
How does the SMAJ90A-M3/5A differ from bidirectional TVS diodes like SMAJ90CA-M3/5A?
The SMAJ90A-M3/5A is unidirectional and features a cathode band marking; it conducts only during reverse overvoltage, offering <1 µA leakage at 90 V. In contrast, SMAJ90CA-M3/5A is bidirectional with no polarity marking and conducts symmetrically in both directions, doubling leakage at VWM. For DC-biased rails (e.g., 12 V or 24 V supplies), SMAJ90A-M3/5A provides tighter leakage control and avoids unintended conduction during normal negative transients-making it the preferred choice unless AC or polarity-agnostic protection is required.
What is the thermal resistance and power derating behavior of the SMAJ90A-M3/5A?
The SMAJ90A-M3/5A has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W on standard 0.2" × 0.2" copper pads. Its 3.3 W steady-state power dissipation (PD) is derated linearly above 25 °C ambient, dropping to zero at 150 °C. For repetitive surges, peak pulse power must be limited to 300 W above 78 V and applied at ≤0.01 % duty cycle (per Fig. 2). The SMAJ90A-M3/5A sustains these ratings without degradation when mounted per Vishay's recommended pad layout.
Can the SMAJ90A-M3/5A replace older SMAJ90A-E3/5A parts in existing designs?
Yes-the SMAJ90A-M3/5A is a direct form-fit-function replacement for SMAJ90A-E3/5A, sharing identical electrical specifications, SMA (DO-214AC) package dimensions, pinout, and solderability. The M3 variant adds halogen-free construction and enhanced whisker resistance (JESD201 Class 2), with no impact on PCB layout or thermal design. No requalification is needed for commercial applications; however, automotive users should confirm AEC-Q101 compliance separately, as the M3 suffix alone does not imply qualification-only HM3-suffixed versions carry that certification.
SMAJ90A-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- 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):
- 2.1A
- Power - Peak Pulse:
- 300W
- 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-214AC (SMA)
SMAJ90A-M3/5A FAQ
1.How can I place an order for SMAJ90A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90A-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ90A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ90A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90A-M3/5A?
SMAJ90A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90A-M3/5A 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-M3/5A?
For technical support, including SMAJ90A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90A-M3/5A requirements.
6.How does Aetrix verify that SMAJ90A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ90A-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ90A-M3/5A?
All SMAJ90A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90A-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ90A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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