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Vishay General Semiconductor - Diodes Division SMAJ90AHM3/H
- Part No.:
- SMAJ90AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90AHM3/H.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,672
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Product details
Overview
SMAJ90AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 90 V standoff voltage (VWM), 100–111 V breakdown range (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 SMAJ90AHM3/H datasheet, SMAJ90AHM3/H pinout, SMAJ90AHM3/H application, or SMAJ90AHM3/H equivalent, key selection considerations include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and suitability for automotive power rail and sensor line protection where fast response (<1 ns), low clamping ratio (VC/VBR ≈ 1.46), and MSL Level 1 reflow compatibility are required.
Technical Context
This device operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds VBR, with cathode band marking polarity. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at 90 V), while the SMA package enables automated placement and meets UL 94 V-0 flammability rating.
Thermal performance is defined by RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting continuous power dissipation of 3.3 W at 50 °C ambient. It sustains 40 A non-repetitive forward surge (8.3 ms half-sine) and derates linearly above 25 °C per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 100 V / 111 V at 1 mA - Confirmed breakdown range ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 146 V at 2.1 A - Clamping voltage under 10/1000 μs transient; limits downstream IC stress to ≤146 V during surge events. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; supports IEC 61000-4-5 level 4 immunity testing. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); validates robustness against inductive switch-off spikes in automotive power circuits. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood automotive environments with proper PCB thermal design. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" length, 0.177" width, and 0.090" height; compatible with J-STD-020 MSL Level 1 reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, cathode indicated by a band on the body. Dimensions: 5.28 mm × 4.50 mm × 2.29 mm (L × W × H). Meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to lower-potential side (e.g., ground or return path); defines directionality for unidirectional clamping. |
| Cathode | Clamping output / Surge current sink | Marked with band; connected to protected line (e.g., 12 V rail or sensor input); conducts transient energy to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors; HM3 suffix confirms qualification. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for Tier 1 automotive supply chains without compromising thermal or electrical performance. |
| 400 W peak pulse power (10/1000 μs) | Supports high-energy transients common in 12 V/24 V vehicle systems, including load dump and ISO 7637-2 pulse 5a. |
| Fast response time (<1 ns) | Clamps before sensitive downstream components (e.g., MCU I/O or CAN transceivers) experience damaging overvoltage. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V or 5 V logic interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 90 V. Use Value: Limits rail voltage to ≤146 V during 400 W transients, preventing damage to voltage regulators and microcontrollers. |
Use Scenario: Safeguarding analog outputs of pressure or temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: TVS mounted across sensor output and ground to absorb ESD and switching noise from nearby solenoids. Use Value: Maintains signal integrity by clamping transients within 1 ns while adding <1 pF capacitance at 0 V bias. |
| Consumer Power Adapter Input Stage | Telecom DC Power Interface |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters powering USB-C PD devices. IC Role / Device Role / Timing Role: Standoff-rated TVS on +5 V or +20 V output rails to absorb flyback spikes from transformer leakage inductance. Use Value: Prevents latch-up in USB PD controllers by limiting output overvoltage to 146 V during no-load transient conditions. |
Use Scenario: DC input protection for PoE-powered network switches exposed to lightning-induced surges on 48 V lines. IC Role / Device Role / Timing Role: Unidirectional TVS on PSE-side DC input to shunt induced common-mode surges to earth ground. Use Value: Withstands repetitive 400 W pulses per IEC 61000-4-5, enabling compliance with EN 61000-6-2 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90AHE3/H | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification. | Approved for industrial/commercial use only; not validated for automotive temperature cycling or humidity testing. | Select SMAJ90AHE3/H for cost-sensitive non-automotive designs where halogen-free and AEC-Q101 are not mandated. |
| SMBJ90A-H | Higher 600 W peak pulse power (10/1000 μs), same VWM/VC, but larger SMB (DO-214AA) package (5.28 mm × 4.57 mm). | Requires larger PCB footprint and higher thermal mass; better suited for high-reliability industrial power supplies. | Choose SMBJ90A-H when system-level surge tests exceed 400 W or when board layout allows larger package for improved thermal margin. |
Compared with SMAJ90AHM3/H, SMAJ90AHE3/H lacks automotive qualification and halogen-free status, while SMBJ90A-H trades compact size for higher surge capacity and thermal robustness-making SMAJ90AHM3/H optimal for space-constrained AEC-Q101-compliant automotive modules.
Availability
SMAJ90AHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ90AHM3/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 automotive-grade validation.
The SMAJ series targets high-speed transient suppression in harsh environments, with design focus on AEC-Q101 compliance, low clamping ratio, and automated manufacturability for automotive and industrial power systems.
FAQ
What is the clamping voltage of the SMAJ90AHM3/H under a 10/1000 μs transient?
The SMAJ90AHM3/H has a maximum clamping voltage (VC) of 146 V at 2.1 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per Figure 1 and Table 1 in Vishay Document 88390, ensuring consistent overvoltage limiting for protected circuits downstream of the SMAJ90AHM3/H.
Is the SMAJ90AHM3/H qualified for automotive applications?
Yes, the SMAJ90AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code and footnote (1) in the Thermal Characteristics section of Vishay Document 88390. This qualification covers temperature cycling, humidity testing, and mechanical shock-making SMAJ90AHM3/H suitable for under-hood and cabin automotive modules.
What does the "HM3" suffix indicate for SMAJ90AHM3/H?
The "HM3" suffix in SMAJ90AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 parts meet JESD 201 Class 2 whisker resistance and are supplied in 7" tape-and-reel (package code H), distinguishing them from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, non-halogen-free) variants.
What is the maximum operating junction temperature for SMAJ90AHM3/H?
The SMAJ90AHM3/H has a maximum operating junction temperature (TJ) of +150 °C, as specified in the Maximum Ratings table of Vishay Document 88390. This rating enables reliable operation in high-temperature automotive environments when mounted on recommended 0.2" × 0.2" copper pads and respecting thermal derating curves in Figure 2.
How does the SMAJ90AHM3/H compare to bidirectional TVS diodes like SMAJ90CA?
The SMAJ90AHM3/H is unidirectional and intended for DC line protection with defined polarity (cathode marked), whereas SMAJ90CA is bidirectional and used in AC or floating signal paths. SMAJ90AHM3/H offers tighter leakage control (<1.0 μA at 90 V) and is AEC-Q101 qualified, while SMAJ90CA lacks automotive qualification and exhibits symmetric breakdown in both directions.
SMAJ90AHM3/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:
- 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:
- 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)
SMAJ90AHM3/H FAQ
1.How can I place an order for SMAJ90AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90AHM3/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 SMAJ90AHM3/H reliable?
The price and inventory of SMAJ90AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ90AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90AHM3/H?
SMAJ90AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90AHM3/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 SMAJ90AHM3/H?
For technical support, including SMAJ90AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90AHM3/H requirements.
6.How does Aetrix verify that SMAJ90AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ90AHM3/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 SMAJ90AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ90AHM3/H?
All SMAJ90AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90AHM3/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 SMAJ90AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ90AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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