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Microchip Technology SMAJ4757E3/TR13
- Part No.:
- SMAJ4757E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4757E3/TR13.pdf
- Description:
- DIODE ZENER 51V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
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Product details
Overview
SMAJ4757E3/TR13 from Vishay Semiconductor is a 2 W, 51 V ±5% Zener diode in DO-214AC (SMA) package, rated for 90 A peak surge current and 36 mA maximum regulator current at 100°C, used for overvoltage protection and voltage regulation in power supply rails and I/O interface circuits.
For engineers reviewing the SMAJ4757E3/TR13 datasheet, SMAJ4757E3/TR13 pinout, SMAJ4757E3/TR13 application, or SMAJ4757E3/TR13 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (25°C/W), steady-state power dissipation (2.0 W), and compliance with JEDEC DO-214AC mechanical standards.
Technical Context
This Zener diode operates in reverse breakdown to clamp transient voltages and regulate DC reference levels. Its 51 V nominal zener voltage is specified at 5.0 mA test current with 95 Ω dynamic impedance, and it maintains stable regulation across -55°C to +150°C operating temperature range.
The device features a cathode band polarity indicator, meets MIL-STD-750 solderability requirements, and is rated for 260°C/10 s reflow. It delivers 90 A surge current capability under 1/120 sec half-sine waveform conditions per JEDEC test method.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% at 5.0 mA - defines clamping threshold for overvoltage protection |
| Power Dissipation (PAV) | 2.0 W - maximum continuous power on 4.0 mm² copper pads |
| Peak Surge Current (IS) | 90 A - handles short-duration transients per 1/120 sec half-sine pulse |
| Dynamic Impedance (ZZT) | 95 Ω @ 5.0 mA - indicates voltage regulation stiffness near nominal current |
| Reverse Leakage (IR) | 5 µA @ 38.8 V - ensures low standby power loss below clamping threshold |
| Thermal Resistance (RθJL) | 25°C/W - determines junction-to-lead temperature rise under load |
| Operating Temperature | -55°C to +150°C - supports industrial and automotive under-hood environments |
Pinout & Package
DO-214AC (SMA) surface-mount package with molded epoxy body, flat handling surface for pick-and-place accuracy, and cathode band marking on one end. Terminals are solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower-potential rail during regulation |
| Cathode | Zener breakdown terminal / high-side clamping node | Connected to protected line; voltage clamped to 51 V when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC DO-214AC footprint compatibility | Enables drop-in replacement of 1N4757A and other industry-standard 51 V Zeners |
| 2 W steady-state power rating | Supports sustained regulation in 12–48 V DC systems without forced cooling |
| 90 A peak surge current | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) in AC/DC front-end protection |
| Cathode band polarity marking | Ensures correct orientation during automated assembly and field inspection |
| UL94V-0 flame-retardant epoxy | Meets safety requirements for enclosed industrial and medical power supplies |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Clamping induced transients on 24 V battery-fed control rails during load dump events. IC Role / Device Role / Timing Role: Primary overvoltage clamp protecting microcontroller I/O and CAN transceivers. Use Value: Limits voltage to ≤51 V with 90 A surge capacity, preventing latch-up or permanent damage to downstream ICs. | Use Scenario: Regulating reference voltage for analog sensor signal conditioning in ambient temperature extremes. IC Role / Device Role / Timing Role: Stable 51 V Zener reference source for precision op-amp biasing. Use Value: Maintains ±5% voltage accuracy from -40°C to +125°C, enabling consistent ADC offset calibration. |
| Telecom Line Card Surge Suppression | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Secondary protection stage after gas discharge tube (GDT) in PoE-powered Ethernet interfaces. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing residual energy post-GDT conduction. Use Value: 95 Ω dynamic impedance ensures minimal overshoot during fast-rising ESD transients (IEC 61000-4-2). | Use Scenario: Protecting 24 V digital input channels against wiring faults and inductive kickback. IC Role / Device Role / Timing Role: Standby shunt regulator that activates only during overvoltage fault conditions. Use Value: Draws <5 µA leakage at 38.8 V, eliminating false triggering while maintaining fail-safe response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4757A | Same 51 V ±5% zener voltage, but in DO-41 through-hole package; higher RθJA (~65°C/W) | Requires PCB through-hole layout; unsuitable for high-density SMT designs | Select SMAJ4757E3/TR13 for surface-mount production and thermal performance; choose 1N4757A only for legacy through-hole repair. |
| BZX84-C51 | 51 V ±5% in SOT-23; lower 300 mW power rating and 20 A surge rating | Limited to low-energy signal-line protection; cannot replace SMAJ4757E3/TR13 in power rail clamping | Use BZX84-C51 for space-constrained logic-level clamping; retain SMAJ4757E3/TR13 for 2 W/90 A primary protection. |
Compared with 1N4757A and BZX84-C51, SMAJ4757E3/TR13 uniquely combines surface-mount DO-214AC packaging, 2 W power handling, and 90 A surge capability-making it the only suitable option for industrial-grade 24–48 V DC rail protection where thermal management and transient robustness are critical.
Availability
SMAJ4757E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control modules, and telecom line card designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ4757E3/TR13 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 Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.
The SMAJ series was designed specifically for surface-mount overvoltage protection in harsh-environment power systems, emphasizing surge robustness, thermal stability, and JEDEC-compliant manufacturability.
FAQ
What is the zener voltage tolerance for SMAJ4757E3/TR13?
The SMAJ4757E3/TR13 has a nominal zener voltage of 51 V with a tolerance of ±5%, as confirmed by its "A" suffix per Vishay's part numbering convention. This tolerance applies at 25°C under 5.0 mA test current and remains stable across its -55°C to +150°C operating range. The SMAJ4757E3/TR13 does not carry tighter tolerance suffixes (e.g., "C" for ±2% or "D" for ±1%).
Is SMAJ4757E3/TR13 compatible with lead-free reflow processes?
Yes, SMAJ4757E3/TR13 supports lead-free reflow with a maximum soldering temperature of 260°C for 10 seconds, per MIL-STD-750 Method 2026. Its DO-214AC package uses solderable terminations qualified for standard Pb-free profiles. The SMAJ4757E3/TR13 must be mounted on 4.0 mm² copper pads per terminal to maintain thermal performance and avoid exceeding 2.0 W derating limits.
How does the surge current rating of SMAJ4757E3/TR13 compare to similar Zeners?
SMAJ4757E3/TR13 delivers 90 A peak surge current under JEDEC-standard 1/120 second half-sine waveform testing-significantly higher than SOT-23 Zeners like BZX84-C51 (20 A) and comparable to other DO-214AC 2 W devices. This rating enables SMAJ4757E3/TR13 to absorb IEC 61000-4-5 Level 4 surges without degradation, making it suitable for primary-stage protection in 24 V industrial systems.
Can SMAJ4757E3/TR13 be used as a voltage reference in precision circuits?
SMAJ4757E3/TR13 is optimized for clamping and regulation-not precision referencing. Its 95 Ω dynamic impedance and ±5% tolerance limit accuracy in reference applications. For stable references, use dedicated low-drift IC references. However, SMAJ4757E3/TR13 can serve as a coarse 51 V reference in non-critical bias networks where cost and surge immunity outweigh precision needs.
What is the maximum reverse leakage current for SMAJ4757E3/TR13 at its rated test voltage?
At 38.8 V (the specified test voltage VR), SMAJ4757E3/TR13 exhibits a maximum reverse leakage current of 5 µA. This low leakage ensures minimal power loss in standby operation and prevents false triggering in high-impedance sensing circuits. The value is measured at 25°C and remains within specification across the full -55°C to +150°C operating range.
SMAJ4757E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 38.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4757E3/TR13 FAQ
1.How can I place an order for SMAJ4757E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4757E3/TR13 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 SMAJ4757E3/TR13 reliable?
The price and inventory of SMAJ4757E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4757E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4757E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4757E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4757E3/TR13?
SMAJ4757E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4757E3/TR13 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 SMAJ4757E3/TR13?
For technical support, including SMAJ4757E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4757E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4757E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4757E3/TR13 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 SMAJ4757E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4757E3/TR13?
All SMAJ4757E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4757E3/TR13, 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 SMAJ4757E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4757E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4757E3/TR13 Tags
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