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Vishay General Semiconductor - Diodes Division SMAJ45AHE3_A/H
- Part No.:
- SMAJ45AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45AHE3_A/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,019
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Product details
Overview
SMAJ45AHE3_A/H 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 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SMAJ45AHE3_A/H datasheet, SMAJ45AHE3_A/H pinout, SMAJ45AHE3_A/H application, or SMAJ45AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 45 V and rapidly transitions to low-impedance conduction above its breakdown threshold. Its glass-passivated junction ensures stable VBR and low leakage (<1.0 μA at VWM), while the SMA package supports thermal dissipation up to 3.3 W at 50 °C ambient with RθJA = 120 °C/W.
The device meets J-STD-020 MSL Level 1, withstands 40 A peak forward surge current (8.3 ms half-sine), and delivers repeatable clamping performance under 0.01% duty cycle pulses. Its temperature coefficient of VBR is +0.102 %/°C, enabling predictable behavior across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 48 V nominal systems. |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction in 45 V rail applications. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamping voltage limits downstream component stress during 10/1000 μs transients; critical for protecting 75 V-rated ICs. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy handling capacity; derates to 300 W above 78 V per spec, but fully applicable at 45 V rating. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); supports robustness against inductive switch-off events in motor drivers. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and enclosed industrial enclosures without thermal derating penalties. |
| Polarity | Unidirectional - Cathode marked with band; blocks reverse current until breakdown, suitable for DC power line protection. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated PPPM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Clamping output node | Connected to protected line (e.g., 48 V rail); conducts transient current to ground when V > VBR. |
| Anode | Reference/return path | Typically tied to system ground; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - enables use in ADAS and body control modules. |
| Glass passivated junction | Ensures stable VBR tolerance and <1.0 μA ID at VWM - reduces false triggering and leakage-induced power loss in battery-powered sensors. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at peak 260 °C - eliminates baking requirements and supports high-throughput SMT assembly. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 48 V lines without degradation - meets industrial EMC immunity standards. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients - preserves margin for 75 V-rated gate drivers and CAN transceivers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 48 V DC-DC converter outputs and battery management system (BMS) monitoring lines against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between rail and ground, responding within <1 ns to suppress spikes exceeding 45 V. Use Value: Limits transient voltage to ≤72.7 V, preventing damage to 75 V-rated buck controllers and isolated ADC front-ends. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules from ESD and inductive coupling in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair or single-ended output to chassis ground. Use Value: Maintains signal integrity with <1.0 μA leakage at 45 V, while clamping 8 kV contact ESD per IEC 61000-4-2 to safe levels. |
| Telecom DC Power Input Protection | Consumer Device USB Power Path Protection |
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras, access points) against lightning-induced surges on 48 V input lines. IC Role / Device Role / Timing Role: Primary-stage TVS mounted at connector entry point, coordinated with upstream fuse and secondary TVS. Use Value: Absorbs 400 W transient energy without failure, preserving uptime and meeting UL 60950-1 surge withstand requirements. |
Use Scenario: Adding robust overvoltage protection to USB-C PD power delivery paths in portable speakers and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between VBUS and GND to clamp adapter overvoltage faults before they reach USB controller ICs. Use Value: Withstands 40 A surge current and maintains 45 V hold-off, ensuring compliance with USB PD 3.1 source fault protection timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive qualification; not recommended for under-hood or safety-critical ECUs. | Select SMAJ45AHE3_A/H when AEC-Q101 compliance is mandatory; choose SMAJ45A-E3/61 for cost-sensitive consumer or industrial non-automotive designs. |
| SMBJ45AHE3_A/H | Same VWM, VBR, VC, and AEC-Q101 rating, but in SMB (DO-214AA) package with higher 600 W PPPM rating and lower RθJA (90 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint (4.57 mm × 3.94 mm vs. SMA's 4.50 mm × 2.79 mm). | Choose SMBJ45AHE3_A/H where higher surge robustness or improved thermal management is needed; retain SMAJ45AHE3_A/H for space-constrained layouts. |
Compared with SMAJ45A-E3/61, SMAJ45AHE3_A/H adds AEC-Q101 qualification for automotive use; compared with SMBJ45AHE3_A/H, it trades 200 W peak power and thermal advantage for smaller footprint and lower profile - making SMAJ45AHE3_A/H optimal for compact, qualified automotive modules.
Availability
SMAJ45AHE3_A/H 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, AEC-Q101 traceability, and consistent lead-time performance.
Supply support for SMAJ45AHE3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - delivering precise clamping, AEC-Q101 validation, and robust SMT manufacturability in the SMA package.
FAQ
What is the maximum clamping voltage of the SMAJ45AHE3_A/H under standard test conditions?
The SMAJ45AHE3_A/H has a maximum clamping voltage (VC) of 72.7 V at 5.5 A peak pulse current (IPPM) using a 10/1000 μs waveform. This value is measured per JEDEC standards and reflects worst-case voltage seen by downstream components during surge events - a critical parameter for ensuring compatibility with 75 V-rated ICs and MOSFETs in 48 V systems.
Is SMAJ45AHE3_A/H qualified for automotive applications?
Yes, SMAJ45AHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet revision 09-Jan-2024. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making SMAJ45AHE3_A/H suitable for engine control units, ADAS camera modules, and body electronics where automotive reliability is mandatory.
What is the thermal resistance and power dissipation capability of SMAJ45AHE3_A/H?
SMAJ45AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. Its steady-state power dissipation (PD) is rated at 3.3 W at TA = 50 °C. These values define its ability to handle continuous leakage and low-duty-cycle surges without exceeding the 150 °C maximum junction temperature - essential for thermal design in sealed enclosures.
How does the unidirectional polarity of SMAJ45AHE3_A/H affect circuit implementation?
The unidirectional polarity of SMAJ45AHE3_A/H means it conducts only when the cathode is positive relative to the anode - ideal for DC power line protection where reverse voltage blocking is required. The banded end marks the cathode and must be connected to the protected line (e.g., 48 V rail), while the anode connects to ground. This configuration prevents unwanted conduction during normal operation and ensures precise clamping during positive transients.
What packaging and moisture sensitivity level applies to SMAJ45AHE3_A/H?
SMAJ45AHE3_A/H is supplied in 7" plastic tape and reel (package code H, base quantity 1800 units) and is rated MSL Level 1 per J-STD-020 - meaning it has unlimited floor life and can be reflowed at a peak temperature of 260 °C without preconditioning. This simplifies manufacturing logistics and supports high-yield automated assembly in high-volume production environments.
SMAJ45AHE3_A/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:
- 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:
- -
- 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_A/H FAQ
1.How can I place an order for SMAJ45AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45AHE3_A/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 SMAJ45AHE3_A/H reliable?
The price and inventory of SMAJ45AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ45AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45AHE3_A/H?
SMAJ45AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45AHE3_A/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 SMAJ45AHE3_A/H?
For technical support, including SMAJ45AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ45AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ45AHE3_A/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 SMAJ45AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ45AHE3_A/H?
All SMAJ45AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45AHE3_A/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 SMAJ45AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ45AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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