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Microchip Technology SMAJ4757AE3/TR13
- Part No.:
- SMAJ4757AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4757AE3/TR13.pdf
- Description:
- DIODE ZENER 51V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,598
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Product details
Overview
SMAJ4757AE3/TR13 from Microsemi (now Microchip Technology) is a 2 W surface-mount silicon Zener diode with a nominal zener voltage of 51 V ±5%, 5 mA test current, 95 Ω dynamic impedance at IZT, and 38.8 mA maximum regulator current at TL = 100°C, used for voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the SMAJ4757AE3/TR13 datasheet, SMAJ4757AE3/TR13 pinout, SMAJ4757AE3/TR13 application, or SMAJ4757AE3/TR13 equivalent, key selection criteria include zener tolerance (±5%), surge current rating (90 mA), thermal resistance (25°C/W), DO-214AC package compatibility, and JEDEC 1N47xxA electrical equivalence.
Technical Context
This device operates as a precision shunt regulator in reverse-bias breakdown mode, maintaining stable output voltage across varying load currents within its 2 W steady-state power dissipation limit when mounted on 4.0 mm² copper pads per terminal.
It features a sharp knee in the breakdown curve verified by dual-point Zener impedance measurement (ZZT and ZZK), with cathode band polarity marking and UL94V-0 flame-retardant epoxy packaging suitable for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% - defines regulated output voltage under 5 mA test current |
| Power Dissipation (PAV) | 2.0 W - maximum continuous power at TL ≤ 100°C on specified PCB copper area |
| Dynamic Impedance (ZZT) | 95 Ω @ 5 mA - indicates voltage stability under small-signal AC variation |
| Max Regulator Current (IZM) | 38.8 mA @ TL = 100°C - maximum DC current before thermal derating to zero at 150°C |
| Surge Current (IS) | 90 mA - peak non-repetitive current for 1/120 sec half-sine pulse at 25°C |
| Reverse Leakage (IR) | 5 µA @ 38.8 V - ensures low standby power loss below regulation threshold |
| Thermal Resistance (RθJL) | 25°C/W - junction-to-lead thermal path efficiency with recommended pad layout |
Pinout & Package
DO-214AC (SMAJ) surface-mount package with two terminals: anode and cathode. Polarity indicated by black cathode band. Standard lead-free termination per Microsemi E3 specification; solderable per MIL-STD-750, Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; reference node in reverse-bias regulation | Connected to lower-potential side of regulated rail; establishes reference ground for zener operation |
| Cathode | Current exit point in forward bias; high-side connection in reverse-bias regulation | Connected to higher-potential side of regulated rail; voltage clamping occurs between cathode and anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxA equivalence | Electrically identical to 1N4757A - enables legacy design drop-in replacement without circuit revalidation |
| High surge current rating | 90 mA single-pulse capability - protects downstream circuitry against transient overvoltage events |
| Surface-mount flat handling surface | Accurate placement during automated pick-and-place - supports high-yield SMT manufacturing |
| UL94V-0 flame retardancy | Self-extinguishing epoxy housing - meets safety requirements for industrial and consumer end equipment |
Applications
| Industrial Power Supply Regulation | Automotive ECU Reference Clamping |
|---|---|
Use Scenario: Stabilizing 5V or 12V auxiliary rails in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Shunt voltage regulator providing precise 51 V reference for feedback networks and error amplifiers. Use Value: Maintains ±5% regulation accuracy under load transients up to 38.8 mA while dissipating ≤2 W on standard PCB copper. | Use Scenario: Protecting microcontroller I/O pins and sensor interfaces from load-dump spikes in 12 V vehicle systems. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping induced surges to safe levels before reaching sensitive IC inputs. Use Value: Absorbs 90 mA surge pulses without degradation, leveraging DO-214AC mechanical robustness for under-hood vibration resistance. |
| Telecom DC-DC Converter Feedback | Test Equipment Voltage Reference |
Use Scenario: Setting output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision zener reference establishing stable secondary-side regulation threshold. Use Value: 95 Ω dynamic impedance ensures minimal output voltage drift during line/load regulation testing. | Use Scenario: Providing calibrated 51 V reference in benchtop multimeters and calibration sources. IC Role / Device Role / Timing Role: Stable shunt reference enabling traceable voltage measurement accuracy. Use Value: ±5% initial tolerance and low 5 µA leakage at 38.8 V support repeatable metrology-grade performance. |
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% VZ, but in DO-41 through-hole package; no tape-and-reel option | Requires manual or wave soldering; unsuitable for high-density SMT layouts | Select SMAJ4757AE3/TR13 for automated assembly; choose 1N4757A only for prototyping or legacy through-hole designs |
| MMSZ5257ET1G | 51 V ±5% VZ, but 500 mW power rating and SOD-123 package; ZZT = 130 Ω @ 20 mA | Lower power handling limits use to low-current bias/reference roles, not primary regulation | Use MMSZ5257ET1G where space is critical and power < 0.5 W; retain SMAJ4757AE3/TR13 for 2 W sustained dissipation needs |
Compared with 1N4757A and MMSZ5257ET1G, SMAJ4757AE3/TR13 uniquely delivers 2 W power handling in a surface-mount DO-214AC package with verified 90 mA surge capability-making it the only choice for SMT-based, medium-power voltage regulation and clamping where thermal margin and transient immunity are design-critical.
Availability
SMAJ4757AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, telecom DC-DC converters, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ4757AE3/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
Microsemi (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components.
The SMAJ47xxA series was designed for surface-mount voltage regulation and transient suppression in industrial, automotive, and telecom systems where JEDEC-compatibility, surge robustness, and thermal reliability are essential.
FAQ
What is the zener voltage tolerance for SMAJ4757AE3/TR13?
The SMAJ4757AE3/TR13 has a nominal zener voltage of 51 V with a tolerance of ±5%, as confirmed in the Electrical Characteristics table. This tolerance applies under standard test conditions (25°C, 5 mA test current), and no suffix (e.g., "C" or "D") is present in the part number-indicating the standard 5% grade. The device does not offer tighter tolerances unless explicitly marked.
Is SMAJ4757AE3/TR13 compatible with JEDEC 1N4757A in circuit design?
Yes, SMAJ4757AE3/TR13 is electrically equivalent to JEDEC-registered 1N4757A per manufacturer documentation, sharing identical zener voltage, test current, dynamic impedance, and regulator current specifications. However, SMAJ4757AE3/TR13 uses a DO-214AC surface-mount package versus DO-41 through-hole, so PCB layout and assembly process differ.
What is the maximum steady-state power dissipation for SMAJ4757AE3/TR13?
The SMAJ4757AE3/TR13 has a steady-state power dissipation rating of 2.0 W at lead temperature (TL) ≤ 100°C, measured with 4.0 mm² copper pads per terminal. Power must be linearly derated above 100°C, reaching zero at 150°C-consistent with its -55°C to +150°C operating temperature range.
Does SMAJ4757AE3/TR13 support automated SMT placement?
Yes, SMAJ4757AE3/TR13 is supplied in tape-and-reel format (TR13 designation) and features a flat handling surface per DO-214AC mechanical specification, enabling accurate pick-and-place alignment. Its lead-free E3 termination complies with RoHS and is solderable per MIL-STD-750, Method 2026.
What is the surge current rating for SMAJ4757AE3/TR13 and how is it tested?
The SMAJ4757AE3/TR13 has a peak surge current rating of 90 mA, measured using a ½ sine-wave or equivalent pulse of 1/120 second duration at 25°C ambient. This rating reflects non-repetitive transient absorption capability and is validated per the manufacturer's test methodology documented in MSC0284A.PDF.
SMAJ4757AE3/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:
- ±5%
- 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
SMAJ4757AE3/TR13 FAQ
1.How can I place an order for SMAJ4757AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4757AE3/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 SMAJ4757AE3/TR13 reliable?
The price and inventory of SMAJ4757AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4757AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4757AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4757AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4757AE3/TR13?
SMAJ4757AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4757AE3/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 SMAJ4757AE3/TR13?
For technical support, including SMAJ4757AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4757AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4757AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4757AE3/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 SMAJ4757AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4757AE3/TR13?
All SMAJ4757AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4757AE3/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 SMAJ4757AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4757AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4757AE3/TR13 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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