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Vishay General Semiconductor - Diodes Division SMAJ90CA-E3/5A
- Part No.:
- SMAJ90CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90CA-E3/5A.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,706
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Product details
Overview
SMAJ90CA-E3/5A from Vishay General Semiconductor is a bidirectional 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), and clamps transients to ≤146 V at 2.1 A peak pulse current (IPPM) under 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMAJ90CA-E3/5A datasheet, SMAJ90CA-E3/5A pinout, SMAJ90CA-E3/5A application, or SMAJ90CA-E3/5A equivalent, this device is selected for high-reliability bidirectional surge suppression where low clamping voltage, fast response (<1 ps), and AEC-Q101 qualification (via HE3/HM3 variants) are critical in 12 V/24 V systems with inductive switching noise.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior and leakage performance (≤1.0 μA at 90 V) in either direction. Its glass-passivated junction ensures stable VBR tolerance (±5 %), low incremental surge resistance, and repeatable 400 W peak pulse power (10/1000 μs) up to 78 V - derated to 300 W above 78 V per Fig. 2.
Mounted on standard 5.0 mm × 5.0 mm copper pads, it achieves 120 °C/W junction-to-ambient thermal resistance and supports surge currents up to 2.1 A while maintaining clamping voltage ≤146 V - enabling protection of downstream MOSFETs, CAN transceivers, and analog front-ends without latch-up or thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage trip threshold |
| VBR (min/max) | 100 V / 111 V at 1 mA - verified breakdown window ensures predictable turn-on margin above VWM |
| VC @ IPPM | ≤146 V at 2.1 A - clamping voltage limits stress on protected ICs during 10/1000 μs transients |
| PPPM | 300 W - peak pulse power rating above 78 V; defines energy-handling capacity for repetitive surges |
| IPPM | 2.1 A - peak pulse current corresponding to VC; used to size PCB trace width and layout clearance |
| Junction Temp | -55 °C to +150 °C - enables operation in under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - industry-standard SMD outline with 2.54 mm lead pitch; compatible with automated placement |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals simplify layout and eliminate orientation errors during assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as input/output; no cathode band - enables identical clamping in both directions |
| Case / Body | Thermal and mechanical interface | Plastic body meets UL 94 V-0; leads matte tin-plated per J-STD-002 for reliable solder wetting |
Key Features
| Feature | Design Value |
|---|---|
| 400 W / 300 W peak pulse power | Supports EN 61000-4-5 Level 4 (4 kV) surge testing when properly laid out on 5 mm² copper pads |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes voltage overshoot during fast transients - critical for protecting 100 V-rated MOSFETs and op-amps |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow without popcorn effect or delamination |
| AEC-Q101 qualified option (HE3/HM3) | Validated for automotive powertrain and chassis applications requiring zero defect reliability |
| 0.064 g unit weight | Reduces board mass and inertial stress in vibration-prone environments (e.g., motor control enclosures) |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus and analog sensor inputs (e.g., pressure, temperature) from load dump and alternator ripple in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between sensor line and ground, absorbing ±100 V transients within nanoseconds. Use Value: Prevents latch-up and parametric shift in precision ADCs and microcontroller GPIOs by limiting voltage to ≤146 V during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to relay coil flyback and ESD in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff protector on 24 V DC input lines, conducting only during >90 V surges while remaining invisible to normal operation. Use Value: Eliminates need for external series resistors or RC filters - preserves signal integrity and response time for 10 kHz digital edge detection. |
| Telecom Line Interface | Power Supply Rail Clamping |
|
Use Scenario: Shielding RS-485 transceiver pins against lightning-induced surges on outdoor data links in security and building management systems. IC Role / Device Role / Timing Role: Primary surge shunt on differential pair, symmetrically referenced to ground to maintain common-mode rejection. Use Value: Maintains <1 pF junction capacitance at 0 V bias - avoids signal distortion on 10 Mbps RS-485 links without degrading rise/fall times. |
Use Scenario: Secondary overvoltage clamp on 90 V intermediate bus rails feeding isolated DC/DC converters in telecom rectifiers. IC Role / Device Role / Timing Role: Fast-acting crowbar that activates before upstream fuses blow, preventing catastrophic failure of downstream SiC MOSFETs. Use Value: Limits rail excursion to ≤146 V during 100 ms overvoltage faults - extends converter lifetime and avoids thermal runaway in high-density power modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90CA-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package | No difference in circuit function or layout; selected where halogen-free compliance is mandated (e.g., EU public infrastructure) | Direct drop-in replacement for SMAJ90CA-E3/5A when halogen-free materials are required |
| SMBJ90CA-E3/52 | Same VWM/VC but in SMB (DO-214AA) package - 20 % larger footprint, 10 % higher PPPM (600 W) | Better thermal dissipation in high-ambient-temp environments (>85 °C); requires PCB pad revision | Choose when higher surge energy handling is needed and board space allows SMB footprint |
Compared with SMAJ90CA-E3/5A, the M3/5A offers identical protection performance with halogen-free construction, while SMBJ90CA-E3/52 delivers 50 % higher peak pulse power in a larger package - enabling longer surge duration tolerance without changing VWM or clamping behavior.
Availability
SMAJ90CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and 90 V power rail clamping requiring stable component supply across multi-year production cycles.
Supply support for SMAJ90CA-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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMAJ series is engineered for robust transient suppression in harsh environments - optimized for fast response, low clamping, and AEC-Q101 qualification in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of the SMAJ90CA-E3/5A under standard test conditions?
The SMAJ90CA-E3/5A exhibits a maximum clamping voltage (VC) of 146 V when subjected to its rated peak pulse current of 2.1 A using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees consistent overvoltage limiting for protected circuits - critical for ensuring downstream ICs remain within absolute maximum ratings during surge events.
Is SMAJ90CA-E3/5A suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ90CA-E3/5A itself is commercial-grade; however, Vishay offers AEC-Q101 qualified versions under ordering codes SMAJ90CAHE3_A/I and SMAJ90CAHM3_A/I. These variants share identical electrical characteristics and SMA package but undergo extended stress testing per AEC-Q101 - making them suitable for automotive powertrain and chassis applications where zero-defect reliability is mandatory.
How does the bidirectional design of SMAJ90CA-E3/5A affect PCB layout compared to unidirectional TVS diodes?
The SMAJ90CA-E3/5A has no polarity marking and functions identically in both directions - eliminating orientation constraints during placement and reducing assembly errors. Unlike unidirectional TVS diodes that require cathode alignment toward the protected line, this bidirectional part simplifies routing on differential pairs and AC-coupled signals, and removes risk of reverse installation in high-volume SMT lines.
What is the thermal resistance and power derating behavior of SMAJ90CA-E3/5A above 25 °C ambient?
SMAJ90CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on standard 5.0 mm × 5.0 mm copper pads. Its peak pulse power derates linearly above 25 °C ambient per Figure 2 in the datasheet - for example, at 75 °C ambient, the 300 W rating drops to ~240 W. Continuous power dissipation remains limited to 3.3 W regardless of temperature.
Can SMAJ90CA-E3/5A be used to protect CAN FD bus lines operating at 5 Mbps?
Yes - SMAJ90CA-E3/5A's junction capacitance is <1.0 pF at 0 V bias (per Fig. 4), which introduces negligible signal distortion on CAN FD physical layers. Its bidirectional clamping and 146 V VC ensure robust protection against ISO 16750-2 load dump transients without compromising bit timing or common-mode rejection - provided layout maintains controlled impedance and minimizes stub length.
SMAJ90CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ90CA-E3/5A FAQ
1.How can I place an order for SMAJ90CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90CA-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 SMAJ90CA-E3/5A reliable?
The price and inventory of SMAJ90CA-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 SMAJ90CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ90CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90CA-E3/5A?
SMAJ90CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90CA-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 SMAJ90CA-E3/5A?
For technical support, including SMAJ90CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ90CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ90CA-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 SMAJ90CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ90CA-E3/5A?
All SMAJ90CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90CA-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 SMAJ90CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ90CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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