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Vishay General Semiconductor - Diodes Division SMAJ90CAHM3/I
- Part No.:
- SMAJ90CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90CAHM3/I.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,258
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Product details
Overview
SMAJ90CAHM3/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 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, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ90CAHM3/I datasheet, SMAJ90CAHM3/I pinout, SMAJ90CAHM3/I application, or SMAJ90CAHM3/I equivalent, this device is selected for robust ESD and surge protection in automotive sensor interfaces, industrial I/O modules, and telecom line receivers where bidirectional clamping, AEC-Q101 qualification, and halogen-free RoHS compliance are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients. Its glass-passivated junction enables fast response time (<1 ps), low incremental surge resistance, and stable performance over temperature (−55 °C to +150 °C).
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 72–90 V nominal systems. |
| VBR min/max | 100 V / 111 V at 1 mA - Confirmed breakdown range ensures reliable turn-on under transient stress without premature conduction. |
| VC @ IPPM | 146 V at 2.1 A - Clamping voltage limits downstream IC stress during 10/1000 μs surges; critical for protecting 100 V-rated components. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power handling capacity validated per Fig. 1; supports IEC 61000-4-5 Level 3/4 surge immunity. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports inrush and fault-current events in power rails. |
| TJ max | +150 °C - Maximum junction temperature enables operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration with no polarity marking; symmetrical terminals enable mounting without orientation constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals function identically as clamping nodes; current flows bidirectionally during ±voltage transients. |
| Case (body) | Thermal and mechanical interface | Plastic-molded body provides UL 94 V-0 flammability rating and serves as primary heat sink path via PCB copper pads. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, ADAS sensors, and infotainment power supplies. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations and eliminates corrosive halogen emissions during reflow or end-of-life processing. |
| 400 W peak pulse power (10/1000 μs) | Provides robust protection against lightning-induced surges and inductive switching spikes in industrial and telecom infrastructure. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping-critical for safeguarding 100 V logic interfaces and analog front-ends. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free soldering without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN FD and LIN bus transceivers from load dump and ISO 7637-2 pulses in vehicle body control modules. IC Role / Device Role: Bidirectional clamping element placed across differential signal pair or supply rail to shunt transient energy. Use Value: Maintains signal integrity during 100 V/500 ms load dump events while meeting AEC-Q101 reliability requirements. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback and EFT bursts. IC Role / Device Role: Primary surge suppression component mounted at connector entry point before optocoupler or MCU GPIO. Use Value: Limits induced voltage to ≤146 V during 4 kV EFT (IEC 61000-4-4), preventing false triggering and latch-up in field-side circuitry. |
| Telecom Line Interface | Consumer Power Adapter Output |
|
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges on outdoor data lines. IC Role / Device Role: Secondary-level TVS deployed after gas discharge tube (GDT) to handle residual fast-rising transients. Use Value: Responds within picoseconds to clamp sub-microsecond rise-time surges, reducing let-through voltage to <150 V. |
Use Scenario: Suppressing output overvoltage spikes caused by transformer leakage in AC/DC adapters powering USB-C PD devices. IC Role / Device Role: Clamp diode connected between +VOUT and GND to absorb 100–200 V transients generated during MOSFET switching transitions. Use Value: Prevents damage to downstream USB PD controllers rated for ≤20 V absolute maximum, despite 90 V VWM headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90CAHE3/I | Same electrical specs but RoHS-compliant without halogen-free certification; uses standard matte tin plating. | Lacks halogen-free material declaration; acceptable for commercial but not automotive or green-certified industrial programs. | Select when halogen-free requirement is not mandated and cost optimization is prioritized. |
| SMBJ90CAHM3/I | Same VWM, VBR, VC, but SMB (DO-214AA) package offers 40% higher PPPM (600 W) and lower RθJA (80 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint (4.58 mm × 3.94 mm vs. 5.28 mm × 4.50 mm). | Choose when higher surge endurance is needed and board space permits larger package. |
Compared with SMAJ90CAHM3/I, SMAJ90CAHE3/I trades halogen-free compliance for lower cost, while SMBJ90CAHM3/I delivers superior power handling and thermal dissipation at the expense of increased board area-enabling design flexibility based on reliability, regulatory, and layout constraints.
Availability
SMAJ90CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line receiver circuits requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for SMAJ90CAHM3/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 validation.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where consistent clamping performance and long-term stability are mission-critical.
FAQ
What is the clamping voltage of SMAJ90CAHM3/I at its rated peak pulse current?
The SMAJ90CAHM3/I has a maximum clamping voltage (VC) of 146 V at 2.1 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per Figure 1 in Vishay Document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ90CAHM3/I maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is SMAJ90CAHM3/I suitable for automotive applications?
Yes, SMAJ90CAHM3/I is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix HM3_X (where "X" denotes revision). It meets stringent reliability requirements for under-hood and cabin electronics, including thermal cycling, humidity resistance, and surge immunity. The SMAJ90CAHM3/I is commonly deployed in body control modules, ADAS camera power supplies, and infotainment system interfaces.
How does the HM3 suffix differ from E3 or HE3 in SMAJ90CAHM3/I?
The HM3 suffix in SMAJ90CAHM3/I indicates halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance-required for green manufacturing and certain automotive OEM specifications. In contrast, E3 denotes RoHS-compliant only, and HE3 adds AEC-Q101 qualification without halogen-free assurance. The SMAJ90CAHM3/I satisfies the most restrictive material compliance tier among SMAJ90CA variants.
What is the thermal resistance of SMAJ90CAHM3/I, and how does it affect PCB layout?
The SMAJ90CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surge conditions, designers must provide adequate copper area and avoid excessive trace length. The SMAJ90CAHM3/I's RθJL of 30 °C/W further emphasizes the importance of direct thermal connection to inner-layer ground planes.
Does SMAJ90CAHM3/I have polarity markings, and how is it installed on PCB?
No, SMAJ90CAHM3/I is a bidirectional TVS and carries no cathode band or polarity marking-its terminals are functionally identical. Installation requires no orientation check; either terminal may connect to line or return. This simplifies automated assembly and eliminates risk of reverse placement. The SMAJ90CAHM3/I's symmetrical structure ensures identical clamping behavior for both positive and negative transients.
SMAJ90CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMAJ90CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90CAHM3/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/I reliable?
The price and inventory of SMAJ90CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ90CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90CAHM3/I?
SMAJ90CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90CAHM3/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/I?
For technical support, including SMAJ90CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90CAHM3/I requirements.
6.How does Aetrix verify that SMAJ90CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ90CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ90CAHM3/I?
All SMAJ90CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ90CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ90CAHM3/I Tags
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