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Vishay General Semiconductor - Diodes Division SMAJ90A-E3/61
- Part No.:
- SMAJ90A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90A-E3/61.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ90A-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on DC power rails and signal lines. It features a 90 V standoff voltage (VWM), 100–111 V breakdown range (VBR at 1 mA), and clamps transients to ≤146 V at 2.1 A peak pulse current (IPPM) under 10/1000 μs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMAJ90A-E3/61 datasheet, SMAJ90A-E3/61 pinout, SMAJ90A-E3/61 application, or SMAJ90A-E3/61 equivalent, key selection criteria include its 400 W peak pulse power rating (≤78 V), 3.3 W steady-state power dissipation, -55 °C to +150 °C operating junction temperature, and SMA (DO-214AC) surface-mount package with cathode band polarity marking.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device in reverse-biased configuration: when transient voltage exceeds VBR, it avalanches to divert surge current away from protected circuitry while maintaining clamped voltage ≤146 V. Its glass-passivated junction ensures stable leakage (<1.0 μA at 90 V) and fast response time (<1 ns).
Thermally, it exhibits RθJA = 120 °C/W (on standard 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, enabling reliable operation up to 150 °C junction temperature. The device is RoHS-compliant (E3 suffix), MSL Level 1 rated, and qualified per JESD201 Class 2 whisker test.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 90 V - maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 100–111 V at 1 mA - precise avalanche initiation range ensuring predictable turn-on during transients |
| VC (Clamping Voltage) | ≤146 V at IPPM = 2.1 A (10/1000 μs) - limits downstream voltage stress during surge events |
| PPPM (Peak Pulse Power) | 400 W - energy-handling capacity for short-duration transients; derated to 300 W above 78 V |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - withstands repetitive inrush or switching surges without degradation |
| TJmax | +150 °C - supports high-temperature environments including under-hood automotive and industrial enclosures |
| Package | SMA (DO-214AC) - low-profile SMD footprint (4.93 mm × 3.99 mm) compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration. Cathode identified by molded band on case end; anode is opposite terminal.
| 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 | Reference / return path | Typically tied to system ground or low-impedance return plane; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges without external series impedance |
| Glass passivated junction | Ensures long-term stability of VBR and leakage current across temperature and lifetime cycling |
| MSL Level 1, 260 °C reflow compatible | Supports lead-free soldering without preconditioning; eliminates moisture-related popcorning risk |
| AEC-Q101 qualification option (HE3 suffix) | Validates reliability for automotive applications including engine control, body electronics, and ADAS power domains |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving clamping fidelity |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply inputs in engine control units (ECUs) against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and ground, upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤146 V during 100 V/500 ms load dump events, preventing damage to downstream 3.3 V/5 V logic and analog front-ends. |
Use Scenario: Safeguarding 4–20 mA current loop and RS-485 transceivers in factory automation sensors exposed to ESD and cable-induced surges. IC Role / Device Role / Timing Role: Line-side TVS on signal pair or power input, absorbing ±8 kV contact ESD (IEC 61000-4-2) and 1 kV ring wave (IEC 61000-4-12). Use Value: Clamps transients within nanoseconds while adding <1 pF capacitance, preserving signal integrity up to 10 Mbps on differential buses. |
| Telecom DC Power Input Protection | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Securing -48 V DC input of telecom base station power modules against lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Primary-level TVS on rectified DC bus, coordinated with MOVs and gas discharge tubes in multi-stage protection architecture. Use Value: Handles 400 W pulses with <1 ns response, reducing let-through energy to secondary protection stages and extending system MTBF. |
Use Scenario: Hardening 5 V/9 V/12 V DC input jacks in smart home hubs and portable audio devices against user-induced ESD and hot-plug transients. IC Role / Device Role / Timing Role: Standalone unidirectional TVS mounted directly at connector, shunting surge current before reaching PMIC or battery charger IC. Use Value: Withstands >10,000 ESD strikes at ±15 kV air/±8 kV contact (per IEC 61000-4-2), eliminating field failures due to jack handling. |
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-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and package | No difference in circuit performance or layout; selected where halogen-free compliance is mandated (e.g., EU public infrastructure) | Direct material substitution when halogen-free bill-of-materials is required; same thermal and clamping behavior as SMAJ90A-E3/61 |
| SMAJ90CA-E3/61 | Bidirectional version; symmetric VBR (100–111 V) and VC (≤146 V) in both polarities; no cathode marking | Required for AC-coupled or floating signal lines (e.g., Ethernet PHY, audio differential pairs) where polarity reversal may occur | Use only when bidirectional clamping is needed; not interchangeable with SMAJ90A-E3/61 in unidirectional DC rails due to lack of polarity reference |
Compared with SMAJ90A-M3/61, SMAJ90A-E3/61 offers standard RoHS compliance without halogen restrictions; compared with SMAJ90CA-E3/61, it provides defined polarity for optimized placement on DC power paths and lower cost in unidirectional use cases.
Availability
SMAJ90A-E3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom power systems, and consumer DC input protection requiring stable component supply and full traceability.
Supply support for SMAJ90A-E3/61 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, consistency, and AEC-Q101 qualification matter.
FAQ
What is the clamping voltage of SMAJ90A-E3/61 at its rated peak pulse current?
The SMAJ90A-E3/61 clamps to a maximum of 146 V when subjected to its specified peak pulse current of 2.1 A under the 10/1000 μs waveform. This value is measured at TA = 25 °C with devices mounted on 0.2" × 0.2" copper pads per JEDEC standards. The clamping performance remains stable across its -55 °C to +150 °C operating junction temperature range, making SMAJ90A-E3/61 suitable for under-hood and industrial deployments.
Is SMAJ90A-E3/61 RoHS-compliant and lead-free solder compatible?
Yes, SMAJ90A-E3/61 carries the "E3" suffix indicating full RoHS compliance and compatibility with lead-free reflow soldering up to 260 °C peak temperature (MSL Level 1 per J-STD-020). Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability requirements, and the device passes JESD 201 Class 2 whisker testing. These attributes ensure SMAJ90A-E3/61 integrates seamlessly into modern high-reliability SMT lines without process modification.
How does SMAJ90A-E3/61 differ from SMAJ90CA-E3/61?
SMAJ90A-E3/61 is unidirectional with cathode band marking and designed for DC rail protection, whereas SMAJ90CA-E3/61 is bidirectional with symmetrical clamping in both polarities and no polarity marking. Their VBR, VC, and PPPM values are identical, but SMAJ90A-E3/61 cannot replace SMAJ90CA-E3/61 in AC or floating signal paths - and vice versa in polarity-sensitive DC circuits. The choice depends strictly on circuit topology, not performance tier.
What is the maximum steady-state power dissipation for SMAJ90A-E3/61?
The SMAJ90A-E3/61 has a maximum steady-state power dissipation (PD) of 3.3 W at TA = 50 °C on an infinite heatsink. In typical PCB layouts with 0.2" × 0.2" copper pads per terminal, derating applies per Fig. 2 in the datasheet; at 70 °C ambient, usable PD drops to ~2.2 W. This rating governs continuous leakage-based heating and must be verified alongside expected reverse leakage (<1.0 μA at 90 V) in low-power standby designs using SMAJ90A-E3/61.
Can SMAJ90A-E3/61 be used in automotive applications?
SMAJ90A-E3/61 meets commercial-grade specifications and is widely deployed in non-safety-critical automotive subsystems such as infotainment power rails and body control modules. For AEC-Q101-qualified versions, specify SMAJ90AHE3_X (e.g., SMAJ90AHE3_A); those variants undergo extended stress testing for temperature cycling, humidity, and mechanical shock. The base SMAJ90A-E3/61 itself is not AEC-Q101 certified, so SMAJ90A-E3/61 should not be used in ASIL-B or higher safety domains without additional validation.
SMAJ90A-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ90A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90A-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ90A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ90A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90A-E3/61?
SMAJ90A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90A-E3/61 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-E3/61?
For technical support, including SMAJ90A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90A-E3/61 requirements.
6.How does Aetrix verify that SMAJ90A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ90A-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ90A-E3/61?
All SMAJ90A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90A-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ90A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ90A-E3/61 Tags
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