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Vishay General Semiconductor - Diodes Division SMAJ90A-E3/5A
- Part No.:
- SMAJ90A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90A-E3/5A.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,228
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Product details
Overview
SMAJ90A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 90 V stand-off voltage (VWM), 100–111 V breakdown range (VBR), 146 V maximum clamping voltage at 2.1 A peak pulse current (IPPM), 400 W peak pulse power (10/1000 μs), and operates across –55 °C to +150 °C junction temperature - deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMAJ90A-E3/5A datasheet, SMAJ90A-E3/5A pinout, SMAJ90A-E3/5A application, or SMAJ90A-E3/5A equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a voltage-clamping overvoltage protector using an avalanche breakdown mechanism. Its unidirectional configuration provides forward conduction only during reverse transient events, with cathode band marking indicating polarity. The device responds in <1 ps to transients and maintains low incremental surge resistance to minimize voltage overshoot under 10/1000 μs surge waveforms.
Designed for PCB-level ESD and surge immunity per IEC 61000-4-2/4-4/4-5, it delivers 400 W peak pulse power up to 78 V and 300 W above that threshold. Thermal performance relies on 0.2" × 0.2" copper pad layout per Vishay's recommended mounting footprint, with junction-to-ambient thermal resistance of 120 °C/W limiting sustained power dissipation to 3.3 W at 50 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR min/max | 100 V / 111 V at 1 mA test current - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 146 V at 2.1 A - Clamped voltage during full-rated 10/1000 μs surge; must stay below protected device's absolute max rating. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy absorption capability; defines survivability against lightning or inductive switch-off surges. |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; negligible loading on 90 V supply rails or high-impedance sensor lines. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive or enclosed industrial enclosures without derating. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard pads; dictates minimum copper area needed for thermal management. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by black band on one end; anode is unmarked opposite end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path during reverse surge. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges on 12 V/24 V automotive power nets. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving clamping precision for sensitive analog front-ends. |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free SMT assembly without moisture sensitivity concerns or baking requirements prior to reflow. |
| AEC-Q101 qualified option (HE3 suffix) | Validated for automotive powertrain and body electronics applications requiring zero-defect reliability and extended temperature cycling. |
| Glass passivated chip junction | Ensures stable VBR and low leakage over lifetime, even under high humidity or thermal stress conditions in industrial environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator ripple-induced transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power input and ground, triggered only during reverse-polarity surges. Use Value: Limits voltage to ≤146 V during 400 W surges, preventing damage to downstream DC/DC converters and microcontrollers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting ESD strikes (IEC 61000-4-2 ±8 kV contact) on 0–10 V or 4–20 mA signal paths. Use Value: Sub-μA leakage at 90 V ensures no measurement drift; fast response preserves signal integrity during transient events. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Control |
|
Use Scenario: Securing 48 V PoE-powered network switches against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input rail upstream of hot-swap controllers and PMICs. Use Value: 146 V clamping headroom allows safe operation with 48 V nominal + 100 % tolerance (up to 96 V), meeting EN 61000-4-5. |
Use Scenario: Shielding MCU GPIOs and gate drivers from back-EMF spikes generated by brushed DC motors in washing machines or HVAC blowers. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to motor driver IC output pins to suppress inductive kickback. Use Value: 2.1 A peak pulse current rating handles repetitive 10/1000 μs spikes from commutation, extending MOSFET lifetime. |
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-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and clamping performance. | No difference in circuit design or layout; selected when halogen-free compliance is mandated by OEM environmental policy. | Choose M3/5A for halogen-free BOM requirements; E3/5A remains optimal for general commercial applications. |
| SMAJ90AHE3_A/I | AEC-Q101 qualified version with enhanced reliability testing (HTOL, TC, UHAST); otherwise identical VWM, VBR, VC, and PPPM. | Required for automotive safety-critical modules (e.g., ADAS power supplies) where qualification evidence is mandatory. | Select HE3_A/I only when AEC-Q101 certification documentation and traceability are contractually required. |
Compared with SMAJ90A-M3/5A and SMAJ90AHE3_A/I, the SMAJ90A-E3/5A offers baseline commercial-grade performance with RoHS compliance and full 400 W surge capability - ideal for cost-sensitive industrial and telecom designs where halogen-free or automotive qualification are not mandated.
Availability
SMAJ90A-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface circuits, telecom DC input protection, and consumer appliance motor drive control requiring stable component supply and consistent parametric performance across production batches.
Supply support for SMAJ90A-E3/5A 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, EFT, and surge events is non-negotiable.
FAQ
What is the clamping voltage of SMAJ90A-E3/5A at its rated peak pulse current?
The SMAJ90A-E3/5A has a maximum clamping voltage (VC) of 146 V at its rated peak pulse current (IPPM) of 2.1 A under a 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that protected circuitry will not experience voltages exceeding 146 V during a full-rated transient event, provided layout follows Vishay's recommended 0.2" × 0.2" copper pad guidelines.
Is SMAJ90A-E3/5A suitable for bidirectional transient protection?
No, SMAJ90A-E3/5A is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, the SMAJ90CA variant must be used - it provides symmetrical clamping in both polarities and lacks polarity marking. Using SMAJ90A-E3/5A on AC-coupled or floating signal lines may result in unintended forward conduction.
Does SMAJ90A-E3/5A meet automotive qualification standards?
The SMAJ90A-E3/5A itself is a commercial-grade part and not AEC-Q101 qualified. However, Vishay offers the functionally identical SMAJ90AHE3_A/I variant - which carries full AEC-Q101 qualification including HTOL, temperature cycling, and unbiased HAST testing - for automotive applications requiring certified reliability.
What is the thermal resistance and maximum power dissipation of SMAJ90A-E3/5A?
SMAJ90A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on Vishay's recommended 0.2" × 0.2" copper pads. Its steady-state power dissipation (PD) is rated at 3.3 W at TA = 50 °C. This limits continuous DC power handling but does not constrain its 400 W transient surge capability, which is thermally non-repetitive.
How does the leakage current of SMAJ90A-E3/5A affect high-impedance circuits?
SMAJ90A-E3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 90 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage ensures negligible loading on high-impedance nodes such as op-amp inputs, ADC reference dividers, or sensor bias networks - preserving accuracy and stability without requiring additional compensation.
SMAJ90A-E3/5A 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-E3/5A FAQ
1.How can I place an order for SMAJ90A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90A-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ90A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ90A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90A-E3/5A?
SMAJ90A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90A-E3/5A 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-E3/5A?
For technical support, including SMAJ90A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90A-E3/5A requirements.
6.How does Aetrix verify that SMAJ90A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ90A-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ90A-E3/5A?
All SMAJ90A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90A-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ90A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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