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Microchip Technology SMAJ4762AE3/TR13
- Part No.:
- SMAJ4762AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4762AE3/TR13.pdf
- Description:
- DIODE ZENER 82V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,976
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Product details
Overview
SMAJ4762AE3/TR13 from Microsemi (now Microchip Technology) is a 2 W surface-mount silicon Zener diode with a nominal zener voltage of 82 V ±5%, 3.0 mA test current, 200 Ω dynamic impedance at IZT, and 55 A peak surge current capability. It serves as a precision voltage regulator or overvoltage clamp in DC power rail protection circuits for industrial power supplies.
For engineers reviewing the SMAJ4762AE3/TR13 datasheet, SMAJ4762AE3/TR13 pinout, SMAJ4762AE3/TR13 application, or SMAJ4762AE3/TR13 equivalent, key selection criteria include its DO-214AC package compatibility, 82 V regulation tolerance, thermal resistance of 25 °C/W, and UL94V-0 flame-retardant mounting suitability.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across load variations and transient events. Its 82 V zener voltage is specified at 3.0 mA test current with 200 Ω dynamic impedance, ensuring predictable regulation under steady-state bias.
The device supports high-energy transients via 55 A peak surge current (½-sine, 1/120 s), enabled by its 2 W steady-state power dissipation on 4.0 mm² copper pads and thermal resistance of 25 °C/W to lead. Polarity is marked by a cathode band, and soldering is rated to 260 °C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 82 V ±5% at 3.0 mA - defines clamping threshold for overvoltage protection |
| Power Dissipation (PAV) | 2.0 W on 4.0 mm² copper pads - sets maximum continuous power handling |
| Dynamic Impedance (ZZT) | 200 Ω at IZT = 3.0 mA - determines regulation stiffness under load changes |
| Peak Surge Current (IS) | 55 A (½-sine, 1/120 s) - enables robust transient suppression per IEC 61000-4-5 |
| Operating Temperature | –55 °C to +150 °C - supports deployment in extended-temperature industrial environments |
| Thermal Resistance (RθJL) | 25 °C/W - informs heatsinking requirements when operating near PAV limit |
Pinout & Package
Package: DO-214AC (SMAJ), surface-mount, flat handling surface, cathode indicated by band. Compliant with JEDEC DO-214AC mechanical outline (with note: max dimension A = 0.115" / 2.92 mm exceeds standard JEDEC 0.105").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal | Marked by band; connected to higher-potential side during clamping operation |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount flat handling surface | Enables accurate automated placement and consistent reflow alignment on PCBs |
| JEDEC 1N47xxA electrical equivalence | Direct functional replacement for through-hole 1N4762A in legacy designs requiring SMT conversion |
| UL94V-0 flame-retardant epoxy | Meets flammability safety requirement for enclosed industrial and power electronics enclosures |
| High surge current rating | 55 A capability supports repeated ESD and lightning-induced surge events without degradation |
Applications
| Industrial Power Supply Protection | DC Motor Drive Snubbing |
|---|---|
Use Scenario: Clamping voltage spikes on 48 V DC bus lines during switching transients in PLC power modules. IC Role / Device Role / Timing Role: Zener clamping diode providing passive overvoltage protection. Use Value: Limits transient excursions to ≤82 V, preventing damage to downstream 100 V-rated MOSFETs and controllers. | Use Scenario: Suppressing inductive kickback from brushed DC motor windings during PWM commutation. IC Role / Device Role / Timing Role: Energy-dissipating Zener element absorbing flyback energy. Use Value: Absorbs 55 A surge pulses without failure, extending motor driver board lifetime in factory automation systems. |
| Telecom Line Card Surge Suppression | Test Equipment Reference Clamp |
Use Scenario: Protecting analog front-end inputs on telecom line cards exposed to induced surges on -48 V distribution rails. IC Role / Device Role / Timing Role: Primary overvoltage clamp on supply rail before LDO regulators. Use Value: Maintains 82 V clamping accuracy within ±5% over –40 °C to +85 °C ambient, ensuring reliable fault containment. | Use Scenario: Providing stable 82 V reference point for calibration circuitry in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Precision voltage reference source under low-current bias (3.0 mA). Use Value: Delivers 200 Ω dynamic impedance for minimal voltage shift during reference loading, improving measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4762A | Through-hole DO-41 package; identical 82 V ±5% VZ, same IZT and ZZT | Requires PCB through-hole layout; not suitable for fully SMT production | Select when retrofitting legacy through-hole boards or prototyping without SMT capability |
| SZ1SMA4762HE3/A/H | Vishay SOD-123FL package; same 82 V ±5%, but lower IS = 40 A and higher ZZT = 220 Ω | Smaller footprint; reduced surge margin and regulation stiffness | Select when space-constrained and surge exposure is limited to IEC 61000-4-2 level 4 only |
Compared with SMAJ4762AE3/TR13, the 1N4762A offers identical electrical performance in through-hole form, while SZ1SMA4762HE3/A/H trades surge robustness and regulation precision for smaller size-making SMAJ4762AE3/TR13 optimal for high-reliability SMT power rail clamping where 55 A surge and 200 Ω ZZT are design-critical.
Availability
SMAJ4762AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supply protection, DC motor drive snubbing, and telecom line card surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ4762AE3/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 semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The SMAJ47xxA series was designed specifically for surface-mount overvoltage protection in ruggedized power systems where thermal stability, surge resilience, and JEDEC-compatibility are mandatory.
FAQ
What is the zener voltage tolerance for SMAJ4762AE3/TR13?
The SMAJ4762AE3/TR13 has a nominal zener voltage of 82 V with a tolerance of ±5%, as confirmed in the Electrical Characteristics table. This tolerance applies at thermal equilibrium (90 seconds after dc current application) and 25 °C ambient temperature. The "E3" suffix denotes this 5% tolerance grade, distinguishing it from 1% (D) or 2% (C) variants. No suffix would indicate 10% tolerance.
Is SMAJ4762AE3/TR13 compatible with reflow soldering processes?
Yes, SMAJ4762AE3/TR13 supports standard SMT reflow profiles. Its maximum soldering temperature is rated at 260 °C for 10 seconds, aligning with IPC-J-STD-020 moisture sensitivity level (MSL) requirements for DO-214AC packages. The device uses terminals solderable per MIL-STD-750, Method 2026, and is qualified for use with flame-retardant epoxy meeting UL94V-0.
How does the thermal resistance of SMAJ4762AE3/TR13 affect its power derating?
The SMAJ4762AE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W. When mounted on 4.0 mm² copper pads, its steady-state power dissipation is 2.0 W at TL ≤ 100 °C. Above 100 °C lead temperature, power must be derated linearly to zero at 150 °C - meaning at 125 °C lead temp, usable power drops to 1.0 W. This derating curve is critical for high-ambient industrial deployments.
Can SMAJ4762AE3/TR13 replace 1N4762A directly in a design?
SMAJ4762AE3/TR13 is electrically equivalent to 1N4762A per the manufacturer's documentation and shares identical zener voltage (82 V ±5%), test current (3.0 mA), and dynamic impedance (200 Ω). However, it is not a drop-in mechanical replacement due to its DO-214AC surface-mount package versus DO-41 through-hole. PCB redesign is required, but no circuit recalculations are needed for clamping function.
What is the maximum reverse leakage current for SMAJ4762AE3/TR13 at rated voltage?
At the rated reverse test voltage (VR) of 62.2 V, the SMAJ4762AE3/TR13 exhibits a maximum reverse current (IR) of 5 µA. This value is measured at 25 °C and confirms low standby power loss in high-impedance clamping configurations. Leakage remains below 10 µA across the full operating temperature range (–55 °C to +150 °C), supporting low-power system integrity.
SMAJ4762AE3/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):
- 82 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 62.2 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
SMAJ4762AE3/TR13 FAQ
1.How can I place an order for SMAJ4762AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4762AE3/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 SMAJ4762AE3/TR13 reliable?
The price and inventory of SMAJ4762AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4762AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4762AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4762AE3/TR13 transactions.
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4.How is shipping managed for SMAJ4762AE3/TR13?
SMAJ4762AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4762AE3/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 SMAJ4762AE3/TR13?
For technical support, including SMAJ4762AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4762AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4762AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4762AE3/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 SMAJ4762AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4762AE3/TR13?
All SMAJ4762AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4762AE3/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 SMAJ4762AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4762AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4762AE3/TR13 Tags
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