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Microchip Technology 1N4745APE3/TR12
- Part No.:
- 1N4745APE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4745APE3/TR12.pdf
- Description:
- DIODE ZENER 16V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,025
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Product details
Overview
1N4745APE3/TR12 from Microsemi is a 16 V, 1 W axial-lead Zener diode in DO-41 package with ±5% voltage tolerance, 15.5 mA test current, and 16 Ω dynamic impedance at IZT, used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N4745APE3/TR12 datasheet, 1N4745APE3/TR12 pinout, 1N4745APE3/TR12 application, or 1N4745APE3/TR12 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 (TR12).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across a wide current range (0.25–15.5 mA) and temperature span (−65 °C to +150 °C). Its 16 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, minimizing drift in mid-voltage references.
The DO-41 plastic package delivers 45 °C/W junction-to-lead thermal resistance at 10 mm lead length, enabling reliable 1 W dissipation at TL < 105 °C. It features cathode band polarity marking, UL94V-0 epoxy body, and MIL-STD-750 compliant tin-lead or RoHS matte-tin terminations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16 V ±5% at 15.5 mA - defines regulated output voltage with tight tolerance for feedback stability |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous operation in compact linear regulator designs |
| Dynamic Impedance (ZZT) | 16 Ω at IZT = 15.5 mA - ensures low AC ripple transmission in voltage reference paths |
| Max Reverse Current (IR) | 5 µA at VR = 12.2 V - guarantees minimal leakage in high-impedance bias networks |
| Surge Current (ISM) | 285 mA (½-sine, 1/120 s) - withstands transient overvoltage events without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead - enables predictable thermal design with standard lead-forming practices |
| Forward Voltage | 1.2 V max @ 200 mA - allows safe forward conduction during fault conditions or startup sequencing |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node; carries full Zener current during regulation |
| Cathode (banded end) | Regulated output terminal | Provides stable 16 V reference; must be held positive relative to anode for breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior for drop-in compatibility in legacy designs |
| RoHS-compliant "e3" suffix | Matte-tin termination meets EU RoHS Directive 2011/65/EU without lead or halogen restrictions |
| Tape-and-reel packaging (TR12) | Standard EIA-296 format enables automated SMT placement despite axial-lead form factor |
| Moisture sensitivity Level 1 | No dry-pack required per IPC/JEDEC J-STD-020B - simplifies handling and storage logistics |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in assembly |
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 diode provides precise 16 V reference to bias TL431 or similar shunt regulator ICs. Use Value: ±5% VZ tolerance and 16 Ω ZZT ensure stable loop gain and minimal output ripple under load transients. | Use Scenario: Supplies stable excitation voltage to bridge-based pressure or strain sensors in factory automation systems. IC Role / Device Role / Timing Role: Functions as a passive, low-drift voltage reference independent of system MCU or ADC supply rails. Use Value: −65 °C to +150 °C operating range and 45 °C/W thermal resistance support long-term calibration stability in uncontrolled environments. |
| Linear Regulator Shunt | Overvoltage Protection Clamp |
Use Scenario: Shunts excess current in low-power LDO pre-regulators or battery-charger voltage limiters. IC Role / Device Role / Timing Role: Acts as programmable voltage clamp to protect downstream regulators from input overvoltage. Use Value: 1 W power rating and 285 mA surge current allow sustained clamping during brown-out recovery or hot-swap events. | Use Scenario: Clamps transient spikes on 12–24 V DC rails in automotive body control modules and industrial PLC I/O cards. IC Role / Device Role / Timing Role: Provides fast-acting, non-latching overvoltage protection ahead of sensitive logic or analog circuitry. Use Value: Low 16 Ω dynamic impedance minimizes clamping voltage overshoot during fast-rising ESD or inductive kick events. |
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; tin-lead terminations only | Not suitable for RoHS-compliant production; requires leaded solder process | Select when legacy tin-lead assembly is mandated and environmental compliance is not required |
| MMSZ4705T1G | Surface-mount SOD-123 package; 16 V, 500 mW, ±5% | Lower power rating and different thermal profile; unsuitable for 1 W continuous dissipation | Select for space-constrained PCB layouts where 500 mW regulation suffices and reflow compatibility is needed |
Compared with 1N4745A and MMSZ4705T1G, the 1N4745APE3/TR12 uniquely combines 1 W power handling, RoHS compliance, tape-and-reel automation readiness, and JEDEC-standard DO-41 mechanical compatibility-making it optimal for high-reliability industrial power designs requiring long-term component continuity.
Availability
1N4745APE3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor references, and overvoltage protection circuits requiring stable component supply and long lifecycle support.
Supply support for 1N4745APE3/TR12 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for robust, cost-effective voltage regulation in harsh-environment power systems where JEDEC-standardization, thermal resilience, and long-term supply assurance are critical.
FAQ
What is the Zener voltage tolerance of the 1N4745APE3/TR12?
The 1N4745APE3/TR12 has a nominal Zener voltage of 16 V with a ±5% tolerance, as indicated by the "A" suffix in the part number per JEDEC registration. This tolerance applies at 15.5 mA test current and 25 °C lead temperature, ensuring predictable regulation in feedback and reference applications.
Does the 1N4745APE3/TR12 require dry packing before use?
No, the 1N4745APE3/TR12 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to assembly. Its plastic DO-41 package is void-free thermosetting epoxy rated UL94V-0, eliminating moisture-related reliability risks during reflow or wave soldering.
What is the maximum surge current rating for the 1N4745APE3/TR12?
The 1N4745APE3/TR12 has a maximum surge current (ISM) of 285 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables reliable clamping of short-duration transients in power rail protection circuits without permanent parameter shift.
Can the 1N4745APE3/TR12 be used in surface-mount assembly processes?
While the 1N4745APE3/TR12 itself is an axial-lead DO-41 device, its TR12 tape-and-reel packaging complies with EIA-296 standards and is compatible with pick-and-place equipment configured for axial components. It is not a surface-mount device but supports automated handling in mixed-technology assembly lines.
What is the thermal resistance specification for the 1N4745APE3/TR12?
The 1N4745APE3/TR12 has a junction-to-lead thermal resistance of 45 °C/W when measured at 3/8 inch (10 mm) lead length from the body. This value enables accurate thermal modeling for 1 W continuous operation at lead temperatures below 105 °C, supporting reliable performance in enclosed power supply enclosures.
1N4745APE3/TR12 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:
- ±5%
- 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)
1N4745APE3/TR12 FAQ
1.How can I place an order for 1N4745APE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745APE3/TR12 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 1N4745APE3/TR12 reliable?
The price and inventory of 1N4745APE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745APE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4745APE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745APE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745APE3/TR12?
1N4745APE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745APE3/TR12 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 1N4745APE3/TR12?
For technical support, including 1N4745APE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745APE3/TR12 requirements.
6.How does Aetrix verify that 1N4745APE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4745APE3/TR12 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 1N4745APE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4745APE3/TR12?
All 1N4745APE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745APE3/TR12, 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 1N4745APE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4745APE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745APE3/TR12 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
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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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