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Vishay General Semiconductor - Diodes Division SMAJ45A-M3/5A
- Part No.:
- SMAJ45A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45A-M3/5A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ45A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA test current, 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 IC power rails, MOSFET gate drivers, and sensor signal lines in industrial and automotive systems.
For engineers reviewing the SMAJ45A-M3/5A datasheet, SMAJ45A-M3/5A pinout, SMAJ45A-M3/5A application, or SMAJ45A-M3/5A equivalent, key selection criteria include verified unidirectional clamping behavior, M3 halogen-free RoHS compliance, 150 °C max junction temperature, and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (<1 μA leakage at 45 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and repeatable clamping performance across temperature.
The device uses a single P-N junction structure with cathode-band polarity marking, optimized for surge immunity per IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive transients). Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring minimal PCB copper area for 3.3 W steady-state dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC rail protection margin. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust protection against 400 W transient energy bursts. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates survivability against inrush or fault currents. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" length, 0.157" width, and matte tin-plated leads compliant with J-STD-002. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case meeting UL 94 V-0 flammability rating; terminals are matte tin plated, solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional mode) | Connected to system ground or low-side return path; forms shunt path during transient conduction. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 45 V supply rail); reverse voltage applied here initiates clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against high-energy transients without thermal runaway on standard PCB layouts. |
| 72.7 V clamping voltage at 5.5 A | Limits downstream IC stress to ≤72.7 V during worst-case surge, preserving logic-level interface integrity. |
| Low incremental surge resistance | Minimizes VC overshoot and improves clamping consistency across multiple surge events. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial end equipment without compromising reliability. |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free reflow assembly without moisture-induced popcorn failure or delamination. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
|
Use Scenario: Protecting 45 V battery-supplied ECUs from load-dump spikes and alternator transients in 12 V/24 V dual-battery architectures. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp surges within 1 ns response time. Use Value: Limits rail voltage to ≤72.7 V during 400 W pulses, preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC I/O modules from EFT and ESD coupling. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground to suppress sub-100 ns transients without distorting 0–10 V signals. Use Value: Maintains signal fidelity with <1 μA leakage at 45 V and clamps ESD events to safe levels before ADC input stages. |
| Consumer Power Adapter Output Stage | MOSFET Gate Driver Transient Suppression |
|
Use Scenario: Safeguarding USB-C PD and AC/DC adapter secondary-side outputs against lightning-induced surges on 45 V auxiliary rails. IC Role / Device Role / Timing Role: Standoff-rated TVS installed across output capacitor to absorb repetitive 10/1000 μs transients without degradation. Use Value: Delivers 400 W pulse handling with 0.057 %/°C VBR tempco, ensuring stable clamping across -55 to +150 °C ambient. |
Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs driven by 45 V bootstrap circuits in motor inverters. IC Role / Device Role / Timing Role: Fast-response TVS tied between gate and source to clamp Miller-induced voltage spikes during switching transitions. Use Value: Responds in <1 ns to limit gate-source voltage to ≤72.7 V, avoiding destructive avalanche in discrete FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for commercial-grade designs where halogen content is unrestricted. | Select E3 for cost-sensitive non-automotive applications; M3 required for halogen-free mandates. |
| SMAJ45CA-M3/5A | Bidirectional variant: symmetric VBR (50.0–55.3 V) in both polarities; same VC, PPPM, and package. | Suitable for AC-coupled or floating signal lines where polarity reversal may occur. | Choose CA version only if bidirectional protection is needed; unidirectional SMAJ45A-M3/5A offers lower leakage in DC systems. |
Compared with SMAJ45A-E3/5A, the M3 suffix adds halogen-free compliance without electrical trade-offs; versus SMAJ45CA-M3/5A, the unidirectional configuration provides tighter leakage control (<1 μA) for DC-biased rails while reducing risk of false triggering in asymmetric circuits.
Availability
SMAJ45A-M3/5A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and consumer power adapter surge resilience requiring stable component supply and full traceability.
Supply support for SMAJ45A-M3/5A 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 AEC-Q101 qualification.
The SMAJ series delivers standardized TVS performance in compact surface-mount packages for board-level transient immunity across automotive, industrial, and computing applications - engineered for repeatable clamping and long-term surge endurance.
FAQ
What is the maximum clamping voltage of SMAJ45A-M3/5A under a 10/1000 μs surge?
The SMAJ45A-M3/5A 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 IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ45A-M3/5A maintains this clamping performance across its specified operating temperature range.
Is SMAJ45A-M3/5A suitable for automotive applications?
Yes, SMAJ45A-M3/5A is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/5A variant itself is commercial-grade and not AEC-Q101 certified. For automotive use, specify SMAJ45A-HM3/5A to ensure qualification. The SMAJ45A-M3/5A retains identical electrical specs and thermal ratings, making it suitable for non-safety-critical automotive subsystems where full qualification is not mandated.
What does the "M3" suffix indicate in SMAJ45A-M3/5A?
The "M3" suffix in SMAJ45A-M3/5A denotes halogen-free, RoHS-compliant construction per Vishay's material categorization standards. It confirms compliance with JEDEC J-STD-20 MSL Level 1 reflow profile (peak 260 °C) and JESD 201 Class 2 whisker resistance. The SMAJ45A-M3/5A meets environmental requirements for industrial and consumer electronics where halogen restrictions apply, without altering electrical performance.
How does SMAJ45A-M3/5A differ from SMAJ45CA-M3/5A?
SMAJ45A-M3/5A is unidirectional with cathode-band polarity and rated for reverse-biased operation only; SMAJ45CA-M3/5A is bidirectional with symmetrical breakdown in both directions and no polarity marking. Both share identical VBR, VC, and PPPM, but SMAJ45A-M3/5A exhibits <1 μA leakage at 45 V, whereas the CA version doubles leakage for VWM ≤10 V - a distinction critical for DC rail protection. The SMAJ45A-M3/5A is preferred for fixed-polarity applications.
What PCB pad layout is recommended for optimal thermal performance of SMAJ45A-M3/5A?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal for SMAJ45A-M3/5A to achieve rated 400 W pulse power and 3.3 W steady-state dissipation. These pads reduce thermal resistance (RθJA = 120 °C/W) and prevent localized overheating during repetitive surges. The SMAJ45A-M3/5A datasheet provides exact DO-214AC footprint dimensions and recommends solder mask defined pads for consistent reflow yield.
SMAJ45A-M3/5A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ45A-M3/5A FAQ
1.How can I place an order for SMAJ45A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45A-M3/5A 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 SMAJ45A-M3/5A reliable?
The price and inventory of SMAJ45A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ45A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45A-M3/5A?
SMAJ45A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45A-M3/5A 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 SMAJ45A-M3/5A?
For technical support, including SMAJ45A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45A-M3/5A requirements.
6.How does Aetrix verify that SMAJ45A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ45A-M3/5A 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 SMAJ45A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ45A-M3/5A?
All SMAJ45A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45A-M3/5A, 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 SMAJ45A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ45A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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