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Vishay General Semiconductor - Diodes Division SMAJ90AHE3/5A
- Part No.:
- SMAJ90AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90AHE3/5A.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,705
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Product details
Overview
SMAJ90AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 90 V stand-off voltage (VWM), 100–111 V breakdown voltage (VBR) at 1 mA test current, and clamps up to 146 V at 2.1 A peak pulse current (IPPM) under 10/1000 μs waveform.
For engineers reviewing the SMAJ90AHE3/5A datasheet, SMAJ90AHE3/5A pinout, SMAJ90AHE3/5A application, or SMAJ90AHE3/5A equivalent, key selection considerations include its AEC-Q101 qualification, 400 W peak pulse power rating (derated to 300 W above 78 V), low incremental surge resistance, and suitability for automotive and industrial DC power line protection where fast response (<1 ns) and robust clamping are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for stable avalanche behavior. Its thermal resistance (RθJA = 120 °C/W) and junction temperature range (–55 °C to +150 °C) support operation in high-reliability automotive environments when mounted on recommended 0.2" × 0.2" copper pads.
The device complies with ANSI/IEEE C62.35 standards for transient suppressors and meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 (260 °C peak reflow). Its 1.0 μA maximum reverse leakage at 90 V ensures minimal standby power loss in always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 90 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe DC operating margin. |
| VBR (Breakdown Voltage) | 100–111 V at 1 mA - Avalanche onset range; ensures reliable triggering during transients without premature conduction. |
| VC (Clamping Voltage) | 146 V at IPPM = 2.1 A (10/1000 μs) - Peak voltage seen by protected circuit during surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capability; enables protection against IEC 61000-4-5 Level 3/4 transients. |
| ID (Reverse Leakage) | 1.0 μA max at VWM - Low leakage preserves signal integrity and battery life in low-power sensor interfaces. |
| TJ max | +150 °C - Enables use in under-hood automotive modules and industrial power supplies with elevated ambient temperatures. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or low-voltage rail; completes clamping path during positive transients on cathode side. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 90 V supply rail); conducts avalanche current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-event suppression of 1 kV/500 A transients per IEC 61000-4-5, critical for 12 V/24 V automotive power nets. |
| Fast response time (<1 ns) | Clamps before downstream MOSFETs or ICs experience damaging overvoltage, preserving gate oxide integrity. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage across temperature and humidity stress, meeting automotive lifetime requirements. |
| MSL Level 1, 260 °C peak reflow | Supports standard SMT assembly without moisture sensitivity concerns or baking requirements. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control units, ADAS power domains, and infotainment system inputs. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 90 V battery-fed subsystems (e.g., HVAC actuators, lighting drivers) from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and ground, triggered within nanoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤146 V, preventing damage to 100 V-rated MOSFETs and microcontrollers in power distribution modules. |
Use Scenario: Safeguarding analog front-ends of pressure/temperature sensors connected to 24–90 V industrial PLC I/O cards. IC Role / Device Role / Timing Role: Standoff-mode protector on sensor supply line, conducting only during surge events while maintaining <1 μA leakage during normal operation. Use Value: Preserves measurement accuracy by avoiding DC loading and prevents latch-up in precision op-amps due to low clamping overshoot. |
| Telecom DC Feeder Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding remote radio unit (RRU) power inputs fed via 90 V DC over long cables from induced lightning surges. IC Role / Device Role / Timing Role: Primary clamping element in multi-stage protection scheme, absorbing bulk surge energy before secondary MOV/GDT stages. Use Value: Withstands repetitive 400 W pulses at 0.01% duty cycle, enabling reliable field deployment in outdoor telecom infrastructure. |
Use Scenario: Guarding BLDC motor driver ICs in premium home appliances (e.g., washing machine inverters) against back-EMF spikes during commutation. IC Role / Device Role / Timing Role: Fast-acting unidirectional suppressor across motor phase-to-rail, activated before driver FETs exceed VDS(max). Use Value: Clamps at 146 V with 2.1 A peak current, matching typical inverter bus voltages and ensuring FET SOA compliance during fault conditions. |
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 | No AEC-Q101 qualification; commercial grade only; identical electrical specs and package. | Not approved for automotive production; suitable for industrial/commercial designs without automotive reliability mandates. | Select when AEC-Q101 is not required and cost optimization is prioritized over automotive qualification. |
| SMBJ90AHE3/5A | Same VWM/VBR/VC but higher PPPM (600 W); SMB (DO-214AA) package with larger thermal mass and 15% larger footprint. | Better thermal performance in high-duty-cycle surge environments; requires PCB layout change due to different pad dimensions. | Choose when surge repetition rate exceeds 0.01% or when board space allows larger SMB package for enhanced reliability. |
Compared with SMAJ90AHE3/5A, the E3/5A variant lacks automotive qualification but offers identical protection performance at lower cost, while SMBJ90AHE3/5A delivers higher surge capacity at the expense of footprint and layout compatibility-making SMAJ90AHE3/5A optimal for space-constrained AEC-Q101-compliant 90 V systems.
Availability
SMAJ90AHE3/5A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, and telecom DC feeder applications requiring stable component supply and AEC-Q101 traceability.
Supply support for SMAJ90AHE3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where consistent clamping performance and long-term stability are mandatory.
FAQ
What is the clamping voltage of the SMAJ90AHE3/5A under a 10/1000 μs surge?
The SMAJ90AHE3/5A clamps to a maximum of 146 V when subjected to its rated peak pulse current of 2.1 A under the standardized 10/1000 μs waveform. This value is measured at the device terminals with specified mounting conditions (0.2" × 0.2" copper pads), and represents the highest voltage imposed on the protected circuit during surge conduction. The SMAJ90AHE3/5A maintains this clamping performance across its operational temperature range.
Is SMAJ90AHE3/5A suitable for automotive applications?
Yes, SMAJ90AHE3/5A is AEC-Q101 qualified, as confirmed by its HE3 suffix and documentation in Vishay's official datasheet (Document Number: 88390, Revision: 09-Jan-2024). It has undergone stress testing for temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 requirements. The SMAJ90AHE3/5A is approved for use in engine control, body electronics, and ADAS power domains where 90 V system protection is needed.
What does the "HE3" suffix indicate in SMAJ90AHE3/5A?
The "HE3" suffix in SMAJ90AHE3/5A denotes RoHS-compliant construction with AEC-Q101 qualification and halogen-free molding compound. It distinguishes this automotive-grade variant from commercial versions (e.g., E3 or M3), confirming compliance with both environmental regulations and automotive reliability standards. The SMAJ90AHE3/5A is supplied in 13" tape-and-reel (5A packaging code) with full traceability for production use.
How does SMAJ90AHE3/5A differ from bidirectional SMAJ90CA variants?
SMAJ90AHE3/5A is unidirectional, featuring a cathode band and conducting only during positive transients on the cathode side, whereas SMAJ90CA is bidirectional with symmetrical clamping in both polarities and no polarity marking. The SMAJ90AHE3/5A exhibits forward voltage drop (~3.5 V at 25 A) and is used where polarity is known and controlled; SMAJ90CA suits AC-coupled or floating lines. Their VWM, VBR, and VC values differ accordingly.
What is the thermal resistance of SMAJ90AHE3/5A, and how does it affect layout?
The SMAJ90AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value assumes no additional heatsinking; exceeding 3.3 W steady-state dissipation risks junction overheating. For reliable operation under repeated surges, maintain adequate copper area and avoid routing heat-sensitive components nearby. The SMAJ90AHE3/5A's RθJL is 30 °C/W, supporting localized thermal relief via thermal vias to inner ground planes.
SMAJ90AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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):
- 2.1A
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ90AHE3/5A FAQ
1.How can I place an order for SMAJ90AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90AHE3/5A 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 SMAJ90AHE3/5A reliable?
The price and inventory of SMAJ90AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ90AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90AHE3/5A?
SMAJ90AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90AHE3/5A 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 SMAJ90AHE3/5A?
For technical support, including SMAJ90AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90AHE3/5A requirements.
6.How does Aetrix verify that SMAJ90AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ90AHE3/5A 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 SMAJ90AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ90AHE3/5A?
All SMAJ90AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90AHE3/5A, 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 SMAJ90AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ90AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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