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Vishay General Semiconductor - Diodes Division SMAJ90CAHM3_A/I
- Part No.:
- SMAJ90CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90CAHM3_A/I.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
SMAJ90CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 90 V standoff voltage (VWM), 100–111 V breakdown voltage (VBR) at 1 mA, 146 V maximum clamping voltage (VC) at 2.1 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), suited for automotive sensor line protection and industrial I/O interface surge suppression.
For engineers reviewing the SMAJ90CAHM3_A/I datasheet, SMAJ90CAHM3_A/I pinout, SMAJ90CAHM3_A/I application, or SMAJ90CAHM3_A/I equivalent, this device serves as a halogen-free, AEC-Q101-qualified TVS for bidirectional transient suppression where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical selection criteria.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (100 V / 111 V), VC (146 V), and ID leakage (<1.0 μA at 90 V) in either direction. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance under repetitive 10/1000 μs transients.
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The device sustains 40 A non-repetitive forward surge current (IFSM) and meets JESD201 Class 2 whisker resistance, supporting high-reliability automotive and industrial PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 100 V / 111 V at IT = 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 146 V at 2.1 A - Clamped voltage seen by downstream ICs during 10/1000 μs surge; limits stress on 100 V-rated components. |
| PPPM | 400 W (≤78 V); 300 W (>78 V) - Peak transient energy handling capability with standard waveform; supports IEC 61000-4-5 level 3/4 compliance. |
| ID @ VWM | <1.0 μA - Ultra-low leakage at rated standoff; prevents signal distortion or bias shift in high-impedance sensor interfaces. |
| TJ max. | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with automated pick-and-place and IR reflow (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration - no polarity marking; symmetrical terminal structure with Cathode and Anode terminals electrically interchangeable for transient suppression in AC-coupled or floating lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | Conducts surge current when voltage at this terminal falls >VBR below cathode; enables bidirectional clamping without external polarity routing. |
| Cathode | Transient current entry (positive polarity event) | Conducts surge current when voltage at this terminal rises >VBR above anode; forms symmetrical clamp path with anode terminal. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-609A Class 1; supports green manufacturing and end-of-life recycling mandates. |
| 400 W peak pulse power (10/1000 μs) | Handles IEC 61000-4-5 combination wave surges up to 1 kV/500 A without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs - e.g., keeps 100 V-rated microcontrollers within safe margin during 1 kV surge. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without moisture-induced damage; eliminates baking requirement prior to assembly. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Limits clamped voltage to 146 V while maintaining <1.0 μA leakage - preserving accuracy of 12-bit ADC references and preventing false triggering in LIN receivers. |
Use Scenario: Safeguarding 24 V DC digital input channels on programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between input line and common rail to absorb 10/1000 μs transients up to 400 W. Use Value: Enables robust operation at ambient temperatures up to +85 °C with verified 150 °C junction rating - eliminating thermal derating concerns in enclosed cabinets. |
| Telecom Line Interface | Consumer Power Adapter Output |
|
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side data/power lines to suppress common-mode transients before isolation barrier. Use Value: Symmetric 100–111 V VBR ensures equal clamping in both directions - critical for differential signaling integrity in 100BASE-TX and PoE++ systems. |
Use Scenario: Secondary-side overvoltage protection on 12 V/19 V SMPS outputs feeding laptops, monitors, and set-top boxes. IC Role / Device Role / Timing Role: Fast-response clamp parallel to output capacitor to suppress switching spikes and adapter fault conditions. Use Value: 146 V VC guarantees downstream 16 V-rated DC-DC converters remain within absolute maximum ratings during 1.2/50 μs ringwave events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90CAHE3_A/I | Same electrical specs, but RoHS-compliant without halogen-free certification; uses standard matte tin plating. | Approved for commercial/industrial use; not qualified for automotive AEC-Q101 stress testing. | Select when halogen-free requirement is absent and cost sensitivity outweighs automotive qualification needs. |
| SMBJ90CAHM3_A/I | Same VWM/VBR/VC, but SMB (DO-214AA) package - 5.28 mm × 4.50 mm vs. SMA's 4.50 mm × 2.79 mm; 600 W PPPM rating. | Higher power handling enables longer surge duration immunity; larger footprint requires PCB layout revision. | Choose when system-level surge testing exceeds 400 W or when thermal margin must be increased via larger copper pads. |
Compared with SMAJ90CAHM3_A/I, SMAJ90CAHE3_A/I omits halogen-free and AEC-Q101 validation but retains identical clamping behavior, while SMBJ90CAHM3_A/I trades compactness for higher surge capacity and thermal mass - requiring board redesign but offering extended lifetime under repetitive transients.
Availability
SMAJ90CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface designs requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SMAJ90CAHM3_A/I 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 targets high-volume, space-constrained transient protection across automotive, industrial, and communications markets - engineered for rapid response, low clamping, and seamless integration into automated SMT lines.
FAQ
What is the maximum clamping voltage of SMAJ90CAHM3_A/I at its rated peak pulse current?
The SMAJ90CAHM3_A/I exhibits a maximum clamping voltage (VC) of 146 V when subjected to its specified peak pulse current (IPPM) of 2.1 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 88390 and reflects worst-case clamping performance at TA = 25 °C with recommended PCB pad layout. The SMAJ90CAHM3_A/I maintains this clamping level consistently across its operational temperature range.
Is SMAJ90CAHM3_A/I suitable for automotive applications?
Yes, SMAJ90CAHM3_A/I is AEC-Q101 qualified and specifically designated for automotive use via the HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 validated). It has passed stress tests including high-temperature reverse bias, temperature cycling, and mechanical shock - making it appropriate for under-hood and cabin-mounted ECUs, ADAS sensors, and infotainment power rails. The SMAJ90CAHM3_A/I meets these requirements without derating at TJ ≤ 150 °C.
How does the bidirectional design of SMAJ90CAHM3_A/I affect its circuit implementation?
The SMAJ90CAHM3_A/I has no polarity marking and conducts identically in both directions, allowing direct placement across any two nodes subject to bidirectional transients - such as differential signal pairs, AC-coupled lines, or floating power rails. Unlike unidirectional TVS diodes, the SMAJ90CAHM3_A/I eliminates the need for orientation verification during assembly and avoids failure modes caused by reverse installation. Its symmetrical VBR (100–111 V) ensures matched clamping regardless of surge polarity.
What is the thermal resistance profile of SMAJ90CAHM3_A/I, and how does it impact PCB layout?
SMAJ90CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, measured on 0.2" × 0.2" copper pads. To maintain TJ ≤ 150 °C under full 400 W pulse loading, PCB layout must follow Vishay's recommended pad dimensions (5.0 mm × 5.0 mm per terminal) and avoid excessive trace length or narrow connections. The SMAJ90CAHM3_A/I's thermal performance is optimized for standard FR-4 with internal ground planes, not isolated pads.
Does SMAJ90CAHM3_A/I require special handling or baking before reflow soldering?
No, SMAJ90CAHM3_A/I is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30 °C/60% RH and processed through standard lead-free reflow profiles (peak 260 °C) without preconditioning or baking. Its moisture-sensitive level classification eliminates moisture-related popcorning risk and simplifies manufacturing logistics. The SMAJ90CAHM3_A/I's glass passivation and robust molding compound ensure reliability across multiple reflow cycles when handled per J-STD-002.
SMAJ90CAHM3_A/I 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:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ90CAHM3_A/I FAQ
1.How can I place an order for SMAJ90CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90CAHM3_A/I 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 SMAJ90CAHM3_A/I reliable?
The price and inventory of SMAJ90CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ90CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90CAHM3_A/I?
SMAJ90CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90CAHM3_A/I 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 SMAJ90CAHM3_A/I?
For technical support, including SMAJ90CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ90CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ90CAHM3_A/I 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 SMAJ90CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ90CAHM3_A/I?
All SMAJ90CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90CAHM3_A/I, 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 SMAJ90CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ90CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ90CAHM3_A/I Tags
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