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Vishay General Semiconductor - Diodes Division SMAJ90AHM3/I
- Part No.:
- SMAJ90AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90AHM3/I.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
SMAJ90AHM3/I 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 stand-off voltage (VWM), 100–111 V breakdown voltage (VBR), 146 V maximum clamping voltage (VC) at 2.1 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive power supply protection and industrial sensor interface circuits.
For engineers reviewing the SMAJ90AHM3/I datasheet, SMAJ90AHM3/I pinout, SMAJ90AHM3/I application, or SMAJ90AHM3/I equivalent, this part delivers AEC-Q101 qualified surge suppression for 12 V/24 V automotive subsystems, meets UL 497B recognition, and supports halogen-free, RoHS-compliant production with MSL Level 1 reflow capability up to 260 °C.
Technical Context
This unidirectional TVS diode operates as a fast-acting shunt clamp during overvoltage events, leveraging a glass-passivated silicon junction for low incremental surge resistance and sub-nanosecond response time. Its thermal design relies on RθJA = 120 °C/W and RθJL = 30 °C/W, with derating above TA = 25 °C per Figure 2 of the datasheet.
The device sustains 40 A non-repetitive forward surge current (IFSM) at 8.3 ms half-sine, supports 1.0 μA max reverse leakage at VWM, and exhibits +0.106 %/°C temperature coefficient of VBR - enabling stable clamping performance across -55 °C to +150 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 100 V / 111 V at 1 mA test current - defines reliable breakdown threshold window |
| VC @ IPPM | 146 V at 2.1 A - clamping voltage under standardized 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W - peak transient energy absorption capacity with 0.01 % duty cycle |
| ID @ VWM | 1.0 μA - ultra-low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive environments and industrial enclosures |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal requirement |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices; compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lower-potential rail; forms current path during reverse-biased clamping |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery feed); conducts when transient exceeds VWM, diverting current to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant | HM3 suffix denotes full compliance with JEDEC J-STD-201 Class 2 whisker resistance and environmental directives |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/85 % RH; supports lead-free reflow up to 260 °C peak without preconditioning |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) in properly laid-out PCBs with 5.0 mm × 5.0 mm pads |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage overshoot during fast transients, protecting downstream MOSFET gates and MCU I/O pins |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protects 12 V power rail feeding microcontroller, relay drivers, and LIN transceivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between battery feed and local regulator input. Use Value: Limits transient excursions to ≤146 V, preventing damage to 3.3 V/5 V LDOs and ensuring system reset integrity during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shields CANH/CANL differential pair from ESD and inductive switching noise in motor control gate drivers. IC Role / Device Role / Timing Role: Paired unidirectional TVS on each bus line referenced to chassis ground. Use Value: Clamps common-mode surges to <150 V while maintaining <10 pF junction capacitance, preserving CAN FD bit timing integrity up to 5 Mbps. |
| Telecom Power Supply Input | Consumer Appliance Motor Driver |
|
Use Scenario: Guards AC-DC adapter primary-side rectifier output against lightning-induced surges on PoE-powered equipment. IC Role / Device Role / Timing Role: Primary-side TVS across bulk capacitor terminals, upstream of DC-DC converter. Use Value: Absorbs 400 W pulses without degradation, meeting UL 60950-1 transient immunity requirements for Class II equipment. |
Use Scenario: Suppresses back-EMF spikes from brushed DC motors in smart home vacuum cleaners and power tools. IC Role / Device Role / Timing Role: Mounted across motor terminals, oriented to conduct only during negative flyback events. Use Value: Limits voltage reversal to ≤146 V, preventing gate oxide rupture in N-channel H-bridge MOSFETs rated at 100 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90AHE3/I | RoHS-compliant but not halogen-free; lacks JESD 201 Class 2 whisker resistance certification | Acceptable for commercial-grade industrial controls where halogen-free is not mandated | Select when cost sensitivity outweighs automotive or green-material requirements |
| SMAJ90A-M3/5A | Same electrical specs; packaged in 13" tape-and-reel (7500 pcs) vs. SMAJ90AHM3/I's 13" reel with I-code marking | Identical performance; differs only in packaging logistics and traceability coding | Choose for high-volume SMT line compatibility with existing feeder setups requiring 5A carrier tape |
Compared with SMAJ90AHM3/I, SMAJ90AHE3/I omits halogen-free assurance and whisker resistance validation, while SMAJ90A-M3/5A matches all electrical and thermal behavior but uses a different reel code and lacks the HM3-specific material declaration - making SMAJ90AHM3/I the preferred choice for AEC-Q101-critical or sustainability-audited designs.
Availability
SMAJ90AHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN networks, and telecom power supply protection requiring stable component supply across extended product lifecycles.
Supply support for SMAJ90AHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series targets robust transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through proven clamping consistency and AEC-Q101 validation.
FAQ
What is the clamping voltage of SMAJ90AHM3/I under a 10/1000 μs surge?
The SMAJ90AHM3/I clamps to a maximum of 146 V when subjected to its rated peak pulse current of 2.1 A using the standard 10/1000 μs waveform. This value is measured per Figure 1 and Table 1 in Vishay Document 88390, and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with 100 V-rated downstream components.
Is SMAJ90AHM3/I suitable for automotive applications?
Yes, SMAJ90AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix) and footnote (1) in the datasheet. It undergoes stress testing for temperature cycling, high-temperature reverse bias, and mechanical shock - making SMAJ90AHM3/I appropriate for under-hood and chassis-mounted modules including body control units and ADAS power domains.
What does the "HM3" suffix mean in SMAJ90AHM3/I?
The "HM3" suffix in SMAJ90AHM3/I indicates halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance certification. It distinguishes this variant from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) versions - confirming that SMAJ90AHM3/I meets stringent environmental and reliability requirements for automotive and green-electronics programs.
How does SMAJ90AHM3/I differ from bidirectional SMAJ90CA variants?
SMAJ90AHM3/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction must be blocked. In contrast, SMAJ90CA is bidirectional, symmetrical in both directions, and used in AC-coupled or differential signal paths like telecom lines - meaning SMAJ90AHM3/I cannot substitute for SMAJ90CA without circuit redesign to accommodate polarity-sensitive placement.
What PCB layout guidance applies to SMAJ90AHM3/I for optimal thermal performance?
Per Vishay Document 88390, SMAJ90AHM3/I requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads on each terminal to achieve rated 400 W pulse power. Traces must be short and wide to minimize inductance; ground plane area beneath the device should be maximized. Thermal relief is discouraged - direct copper connection to internal ground planes ensures RθJA remains near the specified 120 °C/W.
SMAJ90AHM3/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:
- 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/I FAQ
1.How can I place an order for SMAJ90AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90AHM3/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 SMAJ90AHM3/I reliable?
The price and inventory of SMAJ90AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ90AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90AHM3/I?
SMAJ90AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90AHM3/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 SMAJ90AHM3/I?
For technical support, including SMAJ90AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90AHM3/I requirements.
6.How does Aetrix verify that SMAJ90AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ90AHM3/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 SMAJ90AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ90AHM3/I?
All SMAJ90AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90AHM3/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 SMAJ90AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ90AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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