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Vishay General Semiconductor - Diodes Division SMAJ45AHE3/61
- Part No.:
- SMAJ45AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45AHE3/61.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,131
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Product details
Overview
SMAJ45AHE3/61 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 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 - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ45AHE3/61 datasheet, SMAJ45AHE3/61 pinout, SMAJ45AHE3/61 application, or SMAJ45AHE3/61 equivalent, this device is evaluated for ESD and surge immunity in AEC-Q101-qualified automotive subsystems, DC power input stages, and low-voltage I/O protection where fast response (<1 ns), low clamping ratio (1.62×VWM), and MSL Level 1 reflow compatibility are critical.
Technical Context
The SMAJ45AHE3/61 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold to shunt transient energy to ground. 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.
It delivers 5.5 A peak pulse current (IPPM) under standardized 10/1000 μs surge conditions, with clamping performance validated at TA = 25 °C on 0.2" × 0.2" copper pads. The cathode-band marking enables unambiguous polarity identification during automated placement, and its RoHS-compliant matte tin plating meets J-STD-002 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC working range. |
| VBR @ IT = 1 mA | 50.0–55.3 V - Breakdown voltage range confirming reliable turn-on margin above VWM; ensures no false triggering. |
| VC @ IPPM = 5.5 A | 72.7 V - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to ≤1.62×VWM. |
| PPPM | 400 W - Peak pulse power handling capability; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports inrush and fault-current events. |
| TJmax | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm × 4.93 mm footprint; compatible with standard SMT pick-and-place and reflow profiles (peak 260 °C). |
Pinout & Package
SMAJ45AHE3/61 uses the SMA (DO-214AC) package: a molded plastic case with two coplanar leads, cathode identified by a band on the body. Leads are matte tin-plated and solderable per J-STD-002. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line (e.g., VIN, signal) | Provides low forward voltage drop (VF = 3.5 V @ 25 A) during fault conduction; must be routed to lowest-impedance return path. |
| Cathode | Current exit point in forward bias; connected to ground or common reference | Band-marked end; establishes defined polarity for unidirectional clamping; ties to system ground plane for effective surge diversion. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against severe transients like load dump (ISO 7637-2 Pulse 5a) without external series impedance. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during clamping, protecting 48 V-rated components such as CAN transceivers and microcontrollers. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing for high-volume automotive PCB assembly. |
| Glass-passivated junction | Ensures long-term parameter stability and low leakage drift across temperature and lifetime - critical for safety-critical systems. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump transients (up to 60 V, 400 ms) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, acting as crowbar clamp during overvoltage events. Use Value: Limits input rail to ≤72.7 V during 5.5 A surge, preventing damage to upstream DC-DC converters and MCU power supplies. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector interface to absorb sub-100 ns ESD pulses. Use Value: Clamps transients below 72.7 V within <1 ns, preserving signal integrity and avoiding ADC saturation or latch-up in 3.3 V/5 V front-end circuits. |
| Telecom DC Power Feeds | Consumer Device USB/Type-C Port Protection |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras, access points) against induced surges on 48 V DC lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC bus, coordinated with upstream fuse and MOV. Use Value: Handles repetitive 400 W surges without degradation, maintaining protection integrity across 100,000+ surge events per MIL-STD-883H. |
Use Scenario: Adding secondary-level surge immunity to USB Type-C VBUS lines in portable docking stations and chargers. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary ESD array to manage higher-energy lightning-induced surges. Use Value: Withstands 40 A non-repetitive forward surge (IFSM), enabling robust protection against accidental 24 V misconnection or AC coupling faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/61 | Same electrical specs and SMA package, but commercial-grade (non-AEC-Q101 qualified); RoHS-compliant, no halogen restriction. | Approved for industrial and consumer use only; not certified for automotive under-hood deployment. | Select when AEC-Q101 is not required and cost optimization is prioritized over automotive qualification. |
| SMAJ45AHM3/61 | Identical VWM, VBR, and VC, but halogen-free and AEC-Q101 qualified; same RoHS compliance as SMAJ45AHE3/61. | Meets stricter environmental mandates (e.g., EU automotive OEM halogen bans) without sacrificing performance or qualification. | Choose for Tier 1 automotive programs requiring halogen-free materials and full AEC-Q101 traceability. |
Compared with SMAJ45A-E3/61, SMAJ45AHE3/61 adds AEC-Q101 qualification for automotive use; compared with SMAJ45AHM3/61, it omits halogen-free certification but retains identical surge performance and thermal behavior - making SMAJ45AHE3/61 the optimal balance of qualification, supply chain maturity, and cost for mainstream automotive electronics.
Availability
SMAJ45AHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power feeds requiring stable component supply, AEC-Q101 compliance, and consistent surge immunity performance across production batches.
Supply support for SMAJ45AHE3/61 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated through proven, standardized protection devices.
FAQ
What is the clamping voltage of SMAJ45AHE3/61 at its rated peak pulse current?
The SMAJ45AHE3/61 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 at TA = 25 °C on recommended 0.2" × 0.2" copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance remains stable across its operating temperature range due to low VBR temperature coefficient (0.102 %/°C).
Is SMAJ45AHE3/61 suitable for automotive applications?
Yes, SMAJ45AHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use, with ordering code suffix "HE3" indicating RoHS-compliant and AEC-Q101-qualified construction. It meets requirements for under-hood and cabin modules, including engine control, body electronics, and ADAS sensors, and is rated for junction temperatures up to +150 °C with validated surge endurance per JESD22-A114.
How does the SMAJ45AHE3/61 differ from SMAJ45A-E3/61?
The SMAJ45AHE3/61 and SMAJ45A-E3/61 share identical electrical parameters (VWM = 45 V, VBR = 50.0–55.3 V, VC = 72.7 V) and SMA package, but SMAJ45AHE3/61 carries AEC-Q101 qualification while SMAJ45A-E3/61 is commercial-grade only. Both are RoHS-compliant, but only SMAJ45AHE3/61 is approved for automotive production programs requiring formal qualification evidence and traceable lot data.
What is the mounting pad layout recommendation for SMAJ45AHE3/61?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area per terminal for SMAJ45AHE3/61 to achieve its rated 400 W peak pulse power and 3.3 W steady-state power dissipation. Pad dimensions align with DO-214AC outline; thermal vias beneath pads are recommended for enhanced heat transfer in high-duty-cycle applications. The device is MSL Level 1 and compatible with standard lead-free reflow profiles peaking at 260 °C.
Does SMAJ45AHE3/61 have polarity marking, and how is it oriented in circuit?
Yes, SMAJ45AHE3/61 is unidirectional and marked with a cathode band on the body - the banded end connects to system ground or reference potential, while the unmarked end (anode) connects to the line being protected. This orientation ensures reverse-biased operation during normal conditions and rapid avalanche conduction when VWM is exceeded. Incorrect polarity results in forward conduction and potential device failure under normal operating voltage.
SMAJ45AHE3/61 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ45AHE3/61 FAQ
1.How can I place an order for SMAJ45AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45AHE3/61 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 SMAJ45AHE3/61 reliable?
The price and inventory of SMAJ45AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ45AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45AHE3/61?
SMAJ45AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45AHE3/61 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 SMAJ45AHE3/61?
For technical support, including SMAJ45AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45AHE3/61 requirements.
6.How does Aetrix verify that SMAJ45AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ45AHE3/61 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 SMAJ45AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ45AHE3/61?
All SMAJ45AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45AHE3/61, 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 SMAJ45AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ45AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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