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Vishay General Semiconductor - Diodes Division SMAJ90CAHM3/H
- Part No.:
- SMAJ90CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90CAHM3/H.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,833
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Product details
Overview
SMAJ90CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics against inductive switching transients and lightning-induced surges. It features a 90 V standoff voltage (VWM), 100–111 V breakdown range (VBR), 146 V maximum clamping voltage (VC) at 2.1 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is widely deployed on power rails and signal lines of automotive ECUs, industrial sensor interfaces, and telecom front-end circuits.
For engineers reviewing the SMAJ90CAHM3/H datasheet, SMAJ90CAHM3/H pinout, SMAJ90CAHM3/H application, or SMAJ90CAHM3/H equivalent, key selection criteria include its bidirectional polarity, AEC-Q101 qualification, halogen-free RoHS-compliant HM3 suffix, SMA (DO-214AC) package compatibility, and verified clamping performance under repetitive surge conditions up to 150 °C junction temperature.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transient events exceeding VWM, it avalanches rapidly (<1 ps response) to divert surge current away from downstream ICs or MOSFETs. Its bidirectional structure enables symmetric clamping in both polarities without external polarity management.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, supporting operation up to TJ = 150 °C with appropriate PCB copper pad layout (0.2" × 0.2" per terminal). The device is rated for 40 A non-repetitive forward surge (8.3 ms half-sine) and maintains <1.0 μA leakage at 90 V.
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 avalanche initiation range; ensures reliable turn-on above system overvoltage thresholds. |
| VC @ IPPM | 146 V at 2.1 A - Clamped voltage during 10/1000 μs surge; limits stress on protected 100 V-rated components. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); supports protection against IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); validates robustness against motor-switching transients. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm × 4.50 mm footprint; compatible with standard SMT reflow profiles (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (negative polarity event) | Provides low-impedance path to ground during negative voltage excursions; symmetrical with cathode for bidirectional clamping. |
| Cathode | Transient current sink (positive polarity event) | Provides low-impedance path to ground during positive voltage excursions; functionally identical to anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance - supports lead-free manufacturing and environmental compliance. |
| 400 W peak pulse power (10/1000 μs) | Clamps high-energy transients without failure; derates to 300 W above 78 V - matches IEC 61000-4-5 surge immunity requirements. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during suppression - protects 100 V-rated MOSFETs and gate drivers without additional series impedance. |
| Fast response time (<1 ps) | Engages before system-level protection ICs or fuses react - preserves integrity of fast digital interfaces and analog sensors. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply inputs of engine control units (ECUs) and infotainment modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp surges before reaching DC-DC converters and microcontrollers. Use Value: Withstands 40 A surge current and operates up to +150 °C - eliminates need for secondary protection stages in harsh under-hood environments. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA, 0–10 V) of pressure and temperature transmitters in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamping element across signal and return paths to suppress ESD and inductive kickback from solenoid actuators. Use Value: 146 V clamping voltage ensures signal chain ICs remain below absolute maximum ratings even during 1 kV/500 A surge events. |
| Telecom Front-End Surge Protection | Consumer Power Adapter Input Protection |
|
Use Scenario: Shielding Ethernet PHY interfaces and PoE injectors from lightning-induced surges entering via RJ45 ports in outdoor base stations. IC Role / Device Role / Timing Role: Primary line-to-line and line-to-ground TVS array component in multi-stage protection schemes compliant with ITU-T K.21. Use Value: Symmetric bidirectional behavior and low capacitance (<50 pF) prevent signal integrity degradation on 100 MHz Ethernet links. |
Use Scenario: Securing AC-DC adapter primary-side rectifier outputs against mains-borne transients (IEC 61000-4-5) in smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after MOV-based primary protection, absorbing residual energy and limiting let-through voltage. Use Value: 90 V VWM aligns with 100 V DC bus designs; 400 W rating handles repeated surge events without parametric shift or wear-out. |
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/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant with brominated flame retardant (non-halogen-free). | Acceptable where halogen-free requirement is not mandated (e.g., commercial industrial equipment). | Select SMAJ90CAHE3/H if halogen content is not restricted by end-product environmental policy. |
| SMBJ90CAHM3 | Identical VWM, VBR, and VC, but SMB (DO-214AA) package - 3.56 mm × 4.57 mm vs. SMA's 4.50 mm × 5.28 mm; 600 W PPPM. | Better suited for higher-power surge scenarios where board space allows larger thermal mass and higher pulse rating. | Choose SMBJ90CAHM3 when system-level surge testing exceeds 400 W or PCB layout permits larger footprint. |
Compared with SMAJ90CAHM3/H, SMAJ90CAHE3/H offers identical automotive qualification without halogen-free assurance, while SMBJ90CAHM3 provides higher surge capacity in a physically larger package - neither is pin-compatible due to differing package outlines, requiring layout revision for substitution.
Availability
SMAJ90CAHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom infrastructure requiring stable component supply with AEC-Q101 validation and halogen-free compliance.
Supply support for SMAJ90CAHM3/H 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 and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and communications systems - delivering consistent clamping behavior and long-term stability under thermal and electrical stress.
FAQ
What does the "HM3" suffix indicate in SMAJ90CAHM3/H?
The "HM3" suffix denotes that the SMAJ90CAHM3/H is halogen-free, RoHS-compliant, and qualified to AEC-Q101 standards. It uses bromine-free molding compound and meets JESD201 Class 2 whisker resistance requirements, making it suitable for automotive and environmentally regulated industrial applications where halogen content is restricted.
Is SMAJ90CAHM3/H bidirectional, and how does that affect circuit placement?
Yes, SMAJ90CAHM3/H is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. This allows placement across any two nodes requiring overvoltage protection - such as line-to-line or line-to-ground - without orientation constraints, simplifying layout and reducing BOM complexity compared to unidirectional variants.
What is the maximum clamping voltage of SMAJ90CAHM3/H, and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ90CAHM3/H is 146 V, measured at a peak pulse current (IPPM) of 2.1 A using the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream components remain within their absolute maximum ratings.
Can SMAJ90CAHM3/H be used in place of a unidirectional TVS like SMAJ90A?
No - SMAJ90CAHM3/H is strictly bidirectional and lacks cathode marking, whereas SMAJ90A is unidirectional with defined polarity. Substituting SMAJ90CAHM3/H for SMAJ90A would compromise protection in DC-biased circuits where only one polarity requires suppression. Reverse polarity protection or asymmetric clamping behavior cannot be assumed; design intent and circuit topology must match device polarity.
Does SMAJ90CAHM3/H require heatsinking for standard operation?
SMAJ90CAHM3/H does not require external heatsinking for single-event surge suppression, as its thermal design relies on short-duration pulse dissipation. However, for repetitive surge conditions, PCB copper pad area (minimum 0.2" × 0.2" per terminal) is essential to maintain RθJA ≤ 120 °C/W and prevent junction temperature exceedance beyond 150 °C - no additional heatsink is needed if layout guidelines are followed.
SMAJ90CAHM3/H 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/H FAQ
1.How can I place an order for SMAJ90CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90CAHM3/H 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/H reliable?
The price and inventory of SMAJ90CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ90CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90CAHM3/H?
SMAJ90CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90CAHM3/H 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/H?
For technical support, including SMAJ90CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90CAHM3/H requirements.
6.How does Aetrix verify that SMAJ90CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ90CAHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ90CAHM3/H?
All SMAJ90CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90CAHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ90CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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