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Microchip Technology SMAJ4762E3/TR13
- Part No.:
- SMAJ4762E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4762E3/TR13.pdf
- Description:
- DIODE ZENER 82V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,283
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Product details
Overview
SMAJ4762E3/TR13 from Microsemi (now Microchip) 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 supply feedback loops and transient protection circuits.
For engineers reviewing the SMAJ4762E3/TR13 datasheet, SMAJ4762E3/TR13 pinout, SMAJ4762E3/TR13 application, or SMAJ4762E3/TR13 equivalent, key selection criteria include zener tolerance (±5%), thermal resistance (25 °C/W), steady-state power dissipation (2.0 W), and DO-214AC package compatibility with automated SMT assembly.
Technical Context
This device operates in reverse breakdown mode to maintain stable reference voltage under regulated current conditions. Its 82 V zener voltage is specified at 3.0 mA test current (IZT) and exhibits 200 Ω dynamic impedance (ZZT) at that point, ensuring predictable regulation slope near the knee.
The SMAJ4762E3/TR13 supports high-energy transient suppression with a 55 A peak surge current rating (IS) per 1/120 s half-sine pulse, and maintains operation across –55 °C to +150 °C junction temperature range while mounted on 4.0 mm² copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 82 V ±5% - precise clamping threshold for 24–48 V system overvoltage protection |
| Test Current (IZT) | 3.0 mA - minimum bias current required to achieve rated VZ within tolerance |
| Dynamic Impedance (ZZT) | 200 Ω @ IZT - low incremental resistance ensures minimal voltage shift under load variation |
| Peak Surge Current (IS) | 55 A - withstands high-energy transients per JEDEC-standard 1/120 s waveform |
| Steady-State Power (PAV) | 2.0 W - maximum continuous dissipation when mounted on 4.0 mm² copper pads per lead |
| Junction Temperature Range | –55 °C to +150 °C - suitable for automotive under-hood and industrial control environments |
| Thermal Resistance (RθJL) | 25 °C/W - defines temperature rise above lead temperature per watt dissipated |
Pinout & Package
Package: DO-214AC (SMAJ), surface-mount, cathode indicated by band. Dimensions conform to JEDEC outline with maximum body width 2.92 mm (0.115″) and length 5.48 mm (0.216″).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower potential rail during zener operation |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 82 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount flat handling surface | Enables accurate pick-and-place placement and consistent solder joint formation |
| Electrically equivalent to 1N4762A | Direct functional replacement for through-hole 1N4762A in legacy designs requiring SMT conversion |
| UL94V-0 flame-retardant epoxy | Meets safety requirements for enclosed industrial and automotive electronics enclosures |
| MIL-STD-750 solderability | Guarantees reliable intermetallic bond formation using standard reflow profiles |
Applications
| Industrial Power Supply Feedback | Automotive ECU Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing stable 82 V threshold to trigger TL431 or optocoupler bias network. Use Value: Maintains ±5% output regulation accuracy across line/load/temperature variations without external trimming. | Use Scenario: Protecting 12 V/24 V microcontroller I/O pins from load-dump transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing energy before downstream logic reaches absolute maximum ratings. Use Value: Withstands 55 A surge pulses without degradation, preserving signal integrity in engine control units. |
| Telecom Line Card Protection | Renewable Energy Inverter DC-Link Clamp |
Use Scenario: Suppressing induced surges on -48 V telecom distribution bus during lightning-induced coupling events. IC Role / Device Role / Timing Role: Primary shunt element in multi-stage protection scheme, clamping to 82 V before TVS activation. Use Value: Provides predictable 82 V clamping with 200 Ω ZZT, enabling coordinated staging with higher-power secondary protectors. | Use Scenario: Limiting voltage overshoot on 600 V DC-link capacitors during rapid IGBT turn-off in solar inverters. IC Role / Device Role / Timing Role: Auxiliary clamp stabilizing intermediate rail during switching transitions where main snubber is undersized. Use Value: Dissipates up to 2.0 W continuously and absorbs 55 A transients, extending capacitor lifetime in high-temp environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4762A | Same 82 V ±5% zener voltage, but through-hole DO-41 package; 1.0 W power rating | Requires PCB redesign for through-hole mounting; lower surge current (30 A vs. 55 A) | Select for cost-sensitive legacy repairs where SMT conversion is not feasible |
| BZX84-C82LT1G | 82 V ±5%, SOT-23 package, 350 mW power rating, 10 A surge rating | Lower power and surge capability; unsuitable for 2 W continuous or high-energy clamping | Select only for low-power bias/reference use in space-constrained portable devices |
Compared with 1N4762A and BZX84-C82LT1G, the SMAJ4762E3/TR13 delivers 2× the power handling and >1.8× the surge current in an industry-standard SMT package-making it the only option among the three qualified for sustained 2 W regulation and high-energy transient suppression in industrial power systems.
Availability
SMAJ4762E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, telecom line cards, and renewable energy inverters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ4762E3/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 specifically for surface-mount voltage regulation and transient suppression in harsh-environment power systems, emphasizing robust surge performance and tight zener tolerance in compact DO-214AC packaging.
FAQ
What is the zener voltage tolerance for SMAJ4762E3/TR13?
The SMAJ4762E3/TR13 has a nominal zener voltage of 82 V with a tolerance of ±5%, as confirmed in the Electrical Characteristics table. This tolerance applies under standard test conditions (25 °C, IZT = 3.0 mA). No suffix indicates 10% tolerance; the 'A' suffix in the part numbering denotes the ±5% grade, and SMAJ4762E3/TR13 conforms to this specification.
Can SMAJ4762E3/TR13 replace 1N4762A directly in a PCB design?
No, SMAJ4762E3/TR13 cannot be a direct drop-in replacement for 1N4762A due to differing packages: SMAJ4762E3/TR13 uses DO-214AC (SMA), while 1N4762A uses DO-41. Though electrically equivalent per datasheet note, the SMAJ4762E3/TR13 requires SMT footprint redesign. Its higher 2.0 W power rating and 55 A surge capability also demand updated thermal pad layout versus the 1.0 W through-hole part.
What is the maximum steady-state power dissipation for SMAJ4762E3/TR13?
The SMAJ4762E3/TR13 has a steady-state power dissipation rating of 2.0 W, measured when mounted on 4.0 mm² copper pads per terminal at lead temperature ≤100 °C. Power must be derated linearly above 100 °C, reaching zero at 150 °C. This rating is validated per Note 2 and 3 in the Maximum Ratings table of the official datasheet MSC0284A.PDF.
Does SMAJ4762E3/TR13 meet UL94V-0 flammability requirements?
Yes, SMAJ4762E3/TR13 uses flame-retardant epoxy meeting UL94V-0, as stated in the Mechanical Data section. This certification confirms the encapsulant will self-extinguish within 10 seconds after flame removal and produce no flaming drips-critical for compliance in enclosed industrial and automotive electronic assemblies.
What is the peak surge current rating for SMAJ4762E3/TR13 and how is it tested?
The SMAJ4762E3/TR13 has a peak surge current rating of 55 A, measured using a 1/120 second half-sine wave or equivalent sine wave pulse at 25 °C ambient, per Note 3 in the Electrical Characteristics table. This test method aligns with JEDEC standards and validates the device's ability to absorb high-energy transients without parametric shift or failure.
SMAJ4762E3/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:
- ±10%
- 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
SMAJ4762E3/TR13 FAQ
1.How can I place an order for SMAJ4762E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4762E3/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 SMAJ4762E3/TR13 reliable?
The price and inventory of SMAJ4762E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4762E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4762E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4762E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4762E3/TR13?
SMAJ4762E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4762E3/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 SMAJ4762E3/TR13?
For technical support, including SMAJ4762E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4762E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4762E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4762E3/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 SMAJ4762E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4762E3/TR13?
All SMAJ4762E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4762E3/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 SMAJ4762E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4762E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4762E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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