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Microchip Technology 1N4745E3/TR13
- Part No.:
- 1N4745E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4745E3/TR13.pdf
- Description:
- DIODE ZENER 16V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,378
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Product details
Overview
1N4745E3/TR13 from Microsemi is a 16 V, 1 W silicon Zener diode in DO-41 plastic package with ±5% voltage tolerance, 15.5 mA test current (IZT), and 16 Ω dynamic impedance (ZZT) at IZT - used for precision voltage regulation in power supply feedback, reference, and overvoltage protection circuits.
For engineers reviewing the 1N4745E3/TR13 datasheet, 1N4745E3/TR13 pinout, 1N4745E3/TR13 application, or 1N4745E3/TR13 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (285 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR13).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. It features a sharp knee in the breakdown curve verified by dual-point Zener impedance measurement per MicroNote 202, and exhibits low temperature coefficient near zero crossing (~0 mV/°C) due to its 16 V nominal rating.
The device is rated for 1.0 W steady-state dissipation at lead temperature <105 °C (3/8" from body) or ambient <45 °C on FR4 board, with thermal resistance of 105 °C/W junction-to-ambient under defined PCB layout (4 mm² copper pad, 1 mm trace width). Forward voltage is ≤1.2 V at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 16 V ±5% at 15.5 mA - defines regulated output voltage in feedback loops with predictable error band |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous heat removal capability with standard lead mounting |
| Dynamic Impedance (ZZT) | 16 Ω at IZT = 15.5 mA - determines output voltage variation under load transients |
| Max Reverse Current (IR) | 5 μA at VR = 12.2 V - ensures low leakage below regulation threshold in standby modes |
| Surge Current (ISM) | 285 mA (½-sine, 1/120 s) - supports transient overvoltage clamping without failure |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design with known temperature rise per watt at lead |
| Operating Temp | –65 °C to +150 °C - suitable for industrial and automotive under-hood environments |
Pinout & Package
DO-41 (DO-204AL) axial-leaded plastic package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node; carries reverse current during regulation |
| Cathode | Regulated output terminal | Banded end; held at stable Vz above anode; referenced to system ground or feedback point |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Fully compliant with JEDEC 1N47xxA series standards for interchangeability and test methodology |
| Moisture Sensitivity Level 1 | No dry pack required before PCB assembly - reduces handling cost and process steps |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU and China RoHS II |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - no special ESD handling needed in manufacturing |
| Tape-and-reel packaging | TR13 designation indicates EIA-296 standard reel - compatible with automated SMT placement equipment |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in flyback or forward converter feedback networks using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Zener reference element setting precise feedback threshold for TL431 or similar shunt regulators. Use Value: 16 V nominal voltage and 16 Ω ZZT ensure stable loop gain and minimal output drift across –40 °C to +85 °C operating range. | Use Scenario: Provides stable excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Precision voltage reference source replacing higher-cost IC references where 5% tolerance is acceptable. Use Value: Low 5 μA leakage at 12.2 V minimizes sensor bias error; DO-41 package allows through-hole mounting on rugged industrial PCBs. |
| Overvoltage Clamp Protection | Microcontroller Reset Circuit |
Use Scenario: Clamps transient surges on 12 V rail in automotive body control modules during load dump events. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground when voltage exceeds 16 V threshold. Use Value: 285 mA surge rating and 1.0 W power handling sustain 12 V rail integrity without degradation during ISO 7637-2 Pulse 5a events. | Use Scenario: Generates clean reset signal for 3.3 V or 5 V microcontrollers by holding reset line low until supply reaches 16 V × 0.7 ≈ 11.2 V. IC Role / Device Role / Timing Role: Threshold detector enabling power-on reset sequencing via RC delay network. Use Value: Sharp knee impedance and low 0.25 mA minimum regulation current allow reliable turn-on at low supply ramp rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | No "e3" RoHS suffix; Sn/Pb plating; TR13 not standard - bulk or ammo pack only | Lacks RoHS compliance and tape-and-reel convenience for automated assembly | Select when legacy Sn/Pb process or non-automated assembly is used |
| MMSZ4705T1G | Surface-mount SOD-123 package; 16 V ±5%; 500 mW rating; 20 Ω ZZT at 5 mA | Lower power and smaller footprint; requires rework for thermal management on high-current rails | Select for space-constrained PCBs where 1 W dissipation is not required |
Compared with 1N4745A and MMSZ4705T1G, the 1N4745E3/TR13 offers RoHS compliance, tape-and-reel automation readiness, and full 1 W power handling in a robust axial package - making it optimal for industrial power supplies requiring long-term reliability and process compatibility.
Availability
1N4745E3/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and overvoltage protection circuits requiring stable component supply with full traceability and lifecycle support.
Supply support for 1N4745E3/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxA Zener series was designed for general-purpose voltage regulation in cost-sensitive, high-volume power systems where JEDEC-standardized performance and long-term stability are critical.
FAQ
What is the Zener voltage tolerance of the 1N4745E3/TR13?
The 1N4745E3/TR13 has a nominal Zener voltage of 16 V with a tolerance of ±5%, as indicated by the "A" suffix in the base part number. This tolerance is specified at 15.5 mA test current and 25 °C lead temperature, and applies across the full operating temperature range of –65 °C to +150 °C per Microsemi's published electrical characteristics table.
Does the 1N4745E3/TR13 require dry packing before PCB assembly?
No, the 1N4745E3/TR13 does not require dry packing before PCB assembly because it is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B. Its void-free thermosetting epoxy body and RoHS-compliant matte-tin plating ensure robust handling in standard factory environments without baking or humidity-controlled storage.
What is the maximum surge current rating for the 1N4745E3/TR13?
The 1N4745E3/TR13 has a maximum surge current (ISM) rating of 285 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating supports transient overvoltage suppression in automotive and industrial applications, including ISO 7637-2 load dump events on 12 V systems.
Is the 1N4745E3/TR13 compatible with lead-free reflow soldering processes?
Yes, the 1N4745E3/TR13 is compatible with lead-free reflow soldering: its matte-tin plating meets MIL-STD-750 Method 2026, and it withstands solder temperatures up to 260 °C for 10 seconds - satisfying JEDEC J-STD-020 requirements for Pb-free assembly. The DO-41 package remains mechanically stable under these thermal profiles.
How does the thermal resistance of the 1N4745E3/TR13 affect PCB layout?
The 1N4745E3/TR13 has a junction-to-lead thermal resistance of 45 °C/W, meaning each watt dissipated raises the junction temperature 45 °C above lead temperature. For reliable operation at 1 W, keep lead temperature below 105 °C - achieved by maintaining ≥3/8" (10 mm) lead length from body and avoiding excessive copper pour that traps heat near the diode body.
1N4745E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 12.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4745E3/TR13 FAQ
1.How can I place an order for 1N4745E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745E3/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 1N4745E3/TR13 reliable?
The price and inventory of 1N4745E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745E3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4745E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745E3/TR13?
1N4745E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745E3/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 1N4745E3/TR13?
For technical support, including 1N4745E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745E3/TR13 requirements.
6.How does Aetrix verify that 1N4745E3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4745E3/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 1N4745E3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4745E3/TR13?
All 1N4745E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745E3/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 1N4745E3/TR13 part is unused and in its original packaging.
Return procedure for 1N4745E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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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
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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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