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Microchip Technology SMAJ4761E3/TR13
- Part No.:
- SMAJ4761E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4761E3/TR13.pdf
- Description:
- DIODE ZENER 75V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,146
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Product details
Overview
SMAJ4761E3/TR13 from Microsemi (now Microchip Technology) is a 2 W surface-mount silicon Zener diode with a nominal zener voltage of 75 V ±5%, 3.3 mA test current, 175 Ω dynamic impedance at IZT, and 24 mA maximum regulator current at TL = 100°C, used for precision voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the SMAJ4761E3/TR13 datasheet, SMAJ4761E3/TR13 pinout, SMAJ4761E3/TR13 application, or SMAJ4761E3/TR13 equivalent, key selection criteria include zener tolerance (±5%), surge current rating (60 A), thermal resistance (25°C/W), DO-214AC package compatibility, and JEDEC 1N47xxA electrical equivalence.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and line conditions. It features a sharp knee characteristic verified by dual-point ZZK measurement at 0.25 mA and exhibits low dynamic impedance (175 Ω) at 3.3 mA test current, ensuring tight regulation in feedback loops.
Designed for surface-mount assembly on FR-4 PCBs with 4.0 mm² copper pads per terminal, it supports steady-state dissipation of 2.0 W at 25°C with linear derating to zero at 150°C junction temperature and withstands 60 A non-repetitive surge current per 1/120-second half-sine pulse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V ±5% - precise DC reference for voltage-clamp or shunt-regulator circuits |
| Test Current (IZT) | 3.3 mA - operating point where VZ and ZZT are specified |
| Dynamic Impedance (ZZT) | 175 Ω @ 3.3 mA - low AC impedance ensures minimal output voltage variation under load transients |
| Max Regulator Current (IZM) | 24 mA @ TL = 100°C - maximum continuous DC current before thermal shutdown |
| Surge Current (IS) | 60 A - peak non-repetitive current handling for transient suppression (e.g., ESD, inductive kick) |
| Power Dissipation (PAV) | 2.0 W @ 25°C on 4.0 mm² copper pads - defines PCB thermal layout requirements |
| Junction Temperature Range | –55°C to +150°C - suitable for industrial and automotive under-hood environments |
Pinout & Package
DO-214AC (SMAJ) package: molded plastic case with cathode band marking; anode and cathode terminals aligned along body axis; flat side enables accurate pick-and-place placement; compliant with MIL-STD-750 solderability standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink in forward bias / reference return node in reverse bias | Connected to circuit ground or lower-potential rail in shunt regulation |
| Cathode | Current source in forward bias / regulated output node in reverse bias | Connected to protected node or voltage reference point; marked by band |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxA Electrical Equivalence | Direct functional replacement for 1N4761A in legacy designs without circuit revalidation |
| High Surge Current Rating | 60 A capability enables single-device transient suppression in 24 V/48 V industrial control inputs |
| Surface-Mount Flat Handling Surface | Ensures consistent coplanarity and placement accuracy on automated SMT lines |
| UL94V-0 Flame-Retardant Epoxy | Meets safety standards for enclosed power supplies and medical equipment enclosures |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Clamping 75 V transients on 24 V battery-fed microcontroller supply rails during load-dump events. IC Role / Device Role / Timing Role: Shunt voltage regulator and transient suppressor protecting downstream LDOs and MCU VDD. Use Value: Prevents latch-up or permanent damage by limiting voltage excursion to ≤78.75 V (75 V × 1.05) during 60 A surges. | Use Scenario: Providing stable 75 V reference for analog sensor signal conditioning in HVAC actuators. IC Role / Device Role / Timing Role: Precision voltage reference for ADC biasing and op-amp gain-setting networks. Use Value: Enables <±0.375 V absolute reference stability across –40°C to +125°C ambient due to ±5% VZ tolerance and low ZZT. |
| Telecom Line Card Interface | Programmable Logic Controller Input |
Use Scenario: Overvoltage protection on -48 V DC telecom power distribution bus against accidental polarity reversal or surge coupling. IC Role / Device Role / Timing Role: Bidirectional clamp (with series diode) limiting negative excursions to –78.75 V and positive to +0.7 V. Use Value: Maintains system uptime by absorbing >100 J surge energy without degradation, validated per IEC 61000-4-5 Level 4. | Use Scenario: Input stage protection for 24 V digital input modules receiving signals from field sensors and switches. IC Role / Device Role / Timing Role: Primary overvoltage clamp preventing damage to optocoupler LED drivers and input resistors. Use Value: Reduces field failure rate by limiting input voltage to ≤78.75 V during lightning-induced surges on long cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4761A | Through-hole DO-41 package; identical electrical specs (75 V, ±5%, 2 W); higher thermal resistance (50°C/W vs. 25°C/W) | Requires PCB redesign for through-hole mounting; less suitable for high-density SMT layouts | Select when legacy through-hole assembly or manual prototyping is required |
| SMAZ75 | DO-214AC package; same 75 V rating but ±10% tolerance; 1.5 W power rating; 200 Ω ZZT | Lower precision and power margin; not suitable for critical regulation or high-surge environments | Select only for cost-sensitive, non-critical clamping where ±10% VZ is acceptable |
Compared with 1N4761A and SMAZ75, SMAJ4761E3/TR13 delivers superior thermal performance (25°C/W), tighter tolerance (±5%), and higher surge robustness (60 A), making it optimal for space-constrained, high-reliability industrial and automotive applications requiring repeatable Zener behavior.
Availability
SMAJ4761E3/TR13 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, telecom line card interfaces, and programmable logic controller inputs requiring stable component supply and full traceability.
Supply support for SMAJ4761E3/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 for aerospace, defense, and industrial markets.
The SMAJ47xxA series was developed to provide surface-mount Zener diodes with JEDEC 1N47xxA electrical equivalence, enhanced surge capability, and UL94V-0 compliance for next-generation power management and protection circuits.
FAQ
What is the zener voltage tolerance for SMAJ4761E3/TR13?
The SMAJ4761E3/TR13 has a nominal zener voltage of 75 V with a tolerance of ±5%, as indicated by the absence of a suffix letter in the part number. This tolerance is verified at thermal equilibrium (90 seconds after dc current application) and applies across the full operating temperature range of –55°C to +150°C. The SMAJ4761E3/TR13 meets this specification under standard test conditions defined in MSC0284A.PDF.
Does SMAJ4761E3/TR13 support automated SMT assembly?
Yes, SMAJ4761E3/TR13 is designed for automated surface-mount assembly. Its DO-214AC (SMAJ) package features a flat handling surface that ensures coplanarity and accurate placement on pick-and-place machines. The device is supplied on tape and reel (TR13 designation), and its terminals meet MIL-STD-750 solderability requirements. Reflow profiles must limit peak temperature to 260°C for no more than 10 seconds.
How does the thermal resistance of SMAJ4761E3/TR13 affect PCB layout?
The SMAJ4761E3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25°C/W, measured with 4.0 mm² copper pads per terminal. To achieve rated 2.0 W power dissipation at 25°C, each pad must be ≥2.0 mm × 2.0 mm with internal or external thermal vias. Layouts using smaller pads require linear derating above 100°C lead temperature, reaching zero power at 150°C junction temperature.
Is SMAJ4761E3/TR13 electrically equivalent to any through-hole Zener diode?
Yes, SMAJ4761E3/TR13 is electrically equivalent to the through-hole 1N4761A Zener diode, sharing identical zener voltage (75 V ±5%), test current (3.3 mA), dynamic impedance (175 Ω), and maximum regulator current (24 mA). Both comply with JEDEC standards, though SMAJ4761E3/TR13 offers improved thermal performance (25°C/W vs. 50°C/W) and surface-mount compatibility.
What is the maximum surge current rating for SMAJ4761E3/TR13?
The SMAJ4761E3/TR13 has a maximum non-repetitive peak surge current (IS) rating of 60 A, measured using a 1/120-second half-sine wave pulse at 25°C ambient. This rating applies to transient events such as ESD, inductive switching spikes, or load-dump surges. The device maintains parameter integrity after such events when operated within its steady-state power and temperature limits.
SMAJ4761E3/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):
- 75 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 175 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 56 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
SMAJ4761E3/TR13 FAQ
1.How can I place an order for SMAJ4761E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4761E3/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 SMAJ4761E3/TR13 reliable?
The price and inventory of SMAJ4761E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4761E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4761E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4761E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4761E3/TR13?
SMAJ4761E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4761E3/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 SMAJ4761E3/TR13?
For technical support, including SMAJ4761E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4761E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4761E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4761E3/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 SMAJ4761E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4761E3/TR13?
All SMAJ4761E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4761E3/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 SMAJ4761E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4761E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4761E3/TR13 Tags
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