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Vishay General Semiconductor - Diodes Division SMAJ45AHM3/H
- Part No.:
- SMAJ45AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45AHM3/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,579
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Product details
Overview
SMAJ45AHM3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 45 V standoff 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 - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ45AHM3/H datasheet, SMAJ45AHM3/H pinout, SMAJ45AHM3/H application, or SMAJ45AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low incremental surge resistance, and verified clamping performance under repetitive transients in 12 V/24 V automotive systems.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast response (<1 ps) to ESD and lightning-induced surges. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low leakage (<1.0 μA at 45 V), while thermal resistance RθJA = 120 °C/W supports operation up to +150 °C junction temperature.
The SMAJ45AHM3/H delivers 5.5 A peak pulse current (IPPM) at VC = 72.7 V under standardized 10/1000 μs waveform, with derated power above 78 V (300 W). It meets MSL Level 1 per J-STD-020 and is rated for 40 A non-repetitive forward surge (IFSM, 8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V/24 V supply rails. |
| VBR (min/max) | 50.0 V / 55.3 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamping voltage limits downstream IC stress during 400 W surge; critical for protecting 75 V-rated MOSFETs or CAN transceivers. |
| PPPM | 400 W (10/1000 μs) - Peak pulse power handling capacity validated on 5.0 mm × 5.0 mm copper pads; supports ISO 7637-2 Pulse 1/2a/5a compliance. |
| IFSM | 40 A (8.3 ms half-sine) - Withstands high-energy load dump events common in automotive alternator circuits without failure. |
| TJ max | +150 °C - Enables use in under-hood environments and high-temperature industrial enclosures without thermal derating penalties. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated placement; 0.208" × 0.157" body size fits tight board layouts. |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case with matte tin-plated leads, MSL Level 1, 260 °C reflow peak. Polarity indicated by cathode band on one end; anode and cathode terminals are axially oriented.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., CAN_H, LIN, or 12 V rail); conducts surge current to ground when VIN exceeds VBR. |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping loop and must be low-inductance for effective surge diversion. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - supports PPAP and long-term reliability requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards (e.g., ELV, REACH); eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients per ISO 7637-2 and IEC 61000-4-5 Level 3/4 without degradation - suitable for 24 V commercial vehicle systems. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during clamping - protects 5 V/3.3 V logic interfaces downstream of DC-DC converters or LDOs. |
| Glass-passivated junction | Ensures stable VBR across temperature (-55 °C to +150 °C) and lifetime; reduces parameter drift in harsh thermal cycling environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against load dump and jump-start surges in body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input fuse and DC-DC converter input. Use Value: Limits transient voltage to ≤72.7 V during 400 W pulses, preventing latch-up or gate oxide damage in downstream regulators and MCUs. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Fast-response transient suppressor mounted at connector entry point, shunting ESD and inductive kickback to chassis ground. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) within <1 ns, preserving signal integrity and avoiding ADC offset errors or DAC saturation. |
| Automotive CAN Bus Interface Protection | Consumer Appliance Motor Drive Surge Suppression |
Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1057) against coupled transients from adjacent 12 V power switching in infotainment head units. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed on CAN_H line with grounded cathode, referenced to CAN ground. Use Value: Maintains signal rise/fall times due to minimal junction capacitance (~100 pF at 0 V), while clamping bus voltage to safe levels during ISO 11898-2 fault conditions. |
Use Scenario: Absorbing back-EMF spikes from brushed DC motors in smart home appliances (e.g., robotic vacuum cleaners, HVAC blowers). IC Role / Device Role / Timing Role: Primary surge suppression element across motor terminals, connected anode-to-cathode in parallel with motor winding. Use Value: Withstands 40 A single-half-sine surge (IFSM) and repeated 400 W pulses, extending motor driver MOSFET lifetime and reducing field return rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45AHE3/H | Same electrical specs (VWM = 45 V, VC = 72.7 V), but RoHS-compliant without halogen-free certification (E3 vs HM3). | Approved for commercial/industrial use; not qualified for automotive AEC-Q101 or halogen-free mandates. | Select SMAJ45AHE3/H only if halogen-free requirement is absent and AEC-Q101 is not required. |
| SMAJ45A-M3/61 | Identical VWM, VBR, VC, and PPPM; halogen-free RoHS-compliant (M3), but not AEC-Q101 qualified. | Used in consumer electronics and white goods where automotive qualification is unnecessary. | Choose SMAJ45A-M3/61 for cost-sensitive, non-automotive designs requiring halogen-free compliance without AEC validation. |
Compared with SMAJ45AHM3/H, SMAJ45AHE3/H lacks halogen-free assurance and automotive qualification, while SMAJ45A-M3/61 omits AEC-Q101 validation - making SMAJ45AHM3/H the sole option meeting full automotive environmental and reliability requirements in one package.
Availability
SMAJ45AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer appliance motor drive circuits requiring stable component supply, AEC-Q101 traceability, and halogen-free compliance.
Supply support for SMAJ45AHM3/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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMAJ series was developed for high-reliability transient suppression in automotive and industrial environments, delivering consistent clamping behavior, AEC-Q101 validation, and robust surge handling in compact surface-mount packages.
FAQ
What is the clamping voltage of the SMAJ45AHM3/H under peak pulse conditions?
The SMAJ45AHM3/H has a maximum clamping voltage (VC) of 72.7 V at 5.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per standard test conditions and ensures downstream components see limited overvoltage during surge events. The SMAJ45AHM3/H maintains this clamping performance across its specified operating temperature range.
Is the SMAJ45AHM3/H qualified for automotive applications?
Yes, the SMAJ45AHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_X" (where "X" denotes revision). This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge endurance - making the SMAJ45AHM3/H suitable for under-hood and body electronics in passenger vehicles and commercial vehicles.
What does the "HM3" suffix indicate in SMAJ45AHM3/H?
The "HM3" suffix in SMAJ45AHM3/H designates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes the part from E3 (RoHS only), M3 (halogen-free RoHS, no AEC-Q101), and HE3 (RoHS + AEC-Q101, not halogen-free) variants. The "H" denotes 7" tape-and-reel packaging (1800 units per reel), and "/H" confirms the revision level.
Can SMAJ45AHM3/H replace SMAJ45A-E3 in an existing design?
SMAJ45AHM3/H is not a direct drop-in replacement for SMAJ45A-E3 due to differences in qualification and material content: SMAJ45AHM3/H adds AEC-Q101 validation and halogen-free compliance, while SMAJ45A-E3 is commercial-grade only. Layout and soldering profiles remain identical, but automotive or regulated applications require verification of the full HM3 qualification scope before substitution.
What is the maximum operating temperature for SMAJ45AHM3/H?
The SMAJ45AHM3/H has a maximum junction temperature (TJ) rating of +150 °C and an operating junction/storage temperature range of -55 °C to +150 °C. This allows deployment in high-temperature environments such as engine compartments, industrial motor drives, and enclosed power supplies - provided PCB thermal design maintains RθJA ≤ 120 °C/W.
SMAJ45AHM3/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):
- 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/H FAQ
1.How can I place an order for SMAJ45AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45AHM3/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 SMAJ45AHM3/H reliable?
The price and inventory of SMAJ45AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ45AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45AHM3/H?
SMAJ45AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45AHM3/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 SMAJ45AHM3/H?
For technical support, including SMAJ45AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45AHM3/H requirements.
6.How does Aetrix verify that SMAJ45AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ45AHM3/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 SMAJ45AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ45AHM3/H?
All SMAJ45AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45AHM3/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 SMAJ45AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ45AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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