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Vishay General Semiconductor - Diodes Division SMAJ45AHM3_A/I
- Part No.:
- SMAJ45AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45AHM3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,445
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Product details
Overview
SMAJ45AHM3_A/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 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 5.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ45AHM3_A/I datasheet, SMAJ45AHM3_A/I pinout, SMAJ45AHM3_A/I application, or SMAJ45AHM3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold (VBR = 50.0–55.3 V), limiting transient energy to safe levels for downstream circuitry. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the SMA package supports high-density PCB layouts and meets MSL level 1 per J-STD-020.
The device delivers 400 W peak pulse power (10/1000 μs) up to 78 V, derating to 300 W above that; it sustains 40 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits 0.102 %/°C temperature coefficient of VBR - critical for thermal stability in automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 50.0 V / 55.3 V at IT = 1 mA - defines reliable avalanche onset range for design margining |
| VC @ IPPM | 72.7 V at 5.5 A - clamping voltage during 10/1000 μs transient, directly limiting stress on protected ICs |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak transient energy absorption capability under standard waveform |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage ensures minimal standby power loss in battery-powered systems |
| TJ max. | +150 °C - enables operation in under-hood automotive and industrial ambient conditions |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" x 0.157" footprint and matte tin leads |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with glass-passivated chip junction, matte tin-plated leads, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; forms clamping loop with cathode |
| Cathode | Reverse-biased terminal / transient input node | Connected to protected line (e.g., 45 V rail); avalanche conduction occurs here during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power rails |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance requirements without compromising surge robustness |
| 400 W peak pulse power (10/1000 μs) | Handles IEC 61000-4-5 Level 4 surges without degradation when mounted per recommended pad layout |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs |
| MSL level 1, peak reflow ≤260 °C | Enables single-pass lead-free reflow assembly without moisture-induced failure or delamination |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 45 V auxiliary power rails in vehicle infotainment and body control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between rail and ground, responding within <1 ns to suppress transients exceeding 45 V. Use Value: Prevents permanent damage to DC-DC controllers and microcontrollers by limiting clamped voltage to 72.7 V during 400 W surges. |
Use Scenario: Safeguarding analog output lines of pressure and temperature sensors in PLC I/O modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Standoff protection element on 24–48 V sensor supply lines, absorbing inductive switching spikes from solenoid drivers. Use Value: Maintains signal integrity by holding leakage below 1.0 μA at 45 V, avoiding measurement drift in precision 16-bit ADC front-ends. |
| Telecom DC Power Input Protection | Consumer Device USB Power Switch Protection |
|
Use Scenario: Guarding primary DC input of PoE-powered telecom equipment against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line transient suppressor on 48 V input stage, coordinated with upstream fuses and downstream TVS arrays. Use Value: Withstands repetitive 10/1000 μs surges up to 400 W, enabling compliance with ITU-T K.21 basic protection requirements. |
Use Scenario: Shielding USB Type-C power delivery switches in portable monitors from hot-plug voltage overshoot and ESD events. IC Role / Device Role / Timing Role: Unidirectional clamp on VBUS line, activated only during overvoltage - no impact on normal 5–20 V PD negotiation. Use Value: Enables compact layout via SMA package and eliminates need for additional series impedance due to low Rsurge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45AHE3_A/I | Same electrical specs but RoHS-compliant (E3), not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial/industrial use where automotive qualification is not required | Select when halogen-free content is not mandated and cost optimization is prioritized |
| SMAJ45A-M3/5A | Identical electrical and mechanical specs; differs only in packaging format (13" reel, 7500 pcs) and base P/N suffix | No functional difference - same device, alternate ordering code for volume procurement | Choose for high-volume production requiring standard tape-and-reel logistics |
Compared with SMAJ45AHM3_A/I, the SMAJ45AHE3_A/I offers identical clamping performance but omits halogen-free construction and AEC-Q101 validation, while SMAJ45A-M3/5A is functionally identical with different packaging - making the HM3 variant optimal for automotive-grade, environmentally regulated designs requiring full compliance traceability.
Availability
SMAJ45AHM3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply across extended product lifecycles.
Supply support for SMAJ45AHM3_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, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series was developed specifically for high-energy transient suppression in harsh environments, targeting AEC-Q101 compliance and robust clamping performance across 5.0–188 V standoff ranges.
FAQ
What is the clamping voltage of SMAJ45AHM3_A/I at its rated peak pulse current?
The SMAJ45AHM3_A/I has a maximum clamping voltage (VC) of 72.7 V at 5.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ45AHM3_A/I qualified for automotive applications?
Yes, SMAJ45AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet revision 09-Jan-2024. This qualification validates its reliability for automotive powertrain, chassis, and body electronics subjected to temperature cycling, humidity, and mechanical shock per AEC standards.
What does the "HM3" suffix indicate in SMAJ45AHM3_A/I?
The "HM3" suffix in SMAJ45AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, but not halogen-free), confirming compliance with both environmental regulations and automotive reliability requirements.
How does SMAJ45AHM3_A/I differ from SMAJ45A-M3/5A?
SMAJ45AHM3_A/I and SMAJ45A-M3/5A share identical electrical specifications, thermal characteristics, and package dimensions. The difference lies solely in packaging format: HM3_A/I uses 7500-piece 13" tape-and-reel with revision "I", while M3/5A uses the same quantity but different reel coding - no functional or performance distinction exists between them.
What is the maximum operating junction temperature for SMAJ45AHM3_A/I?
The maximum operating junction temperature (TJ max.) for SMAJ45AHM3_A/I is +150 °C, as specified in the Vishay datasheet. This rating enables reliable operation in under-hood automotive environments and high-temperature industrial enclosures, provided thermal design accounts for RθJA = 120 °C/W and appropriate PCB copper area is used.
SMAJ45AHM3_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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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)
SMAJ45AHM3_A/I FAQ
1.How can I place an order for SMAJ45AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45AHM3_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 SMAJ45AHM3_A/I reliable?
The price and inventory of SMAJ45AHM3_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 SMAJ45AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ45AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45AHM3_A/I?
SMAJ45AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45AHM3_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 SMAJ45AHM3_A/I?
For technical support, including SMAJ45AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ45AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ45AHM3_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 SMAJ45AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ45AHM3_A/I?
All SMAJ45AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45AHM3_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 SMAJ45AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ45AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45AHM3_A/I Tags
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