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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N4745PE3/TR8

Name: 1N4745PE3/TR8
Brand: Microchip Technology
SKU: 1N4745PE3/TR8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4745PE3/TR8

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: 1N4745PE3/TR8.pdf

Description:: DIODE ZENER 16V 1W DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:2,267

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Product details

Overview

1N4745PE3/TR8 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, and 16 Ω dynamic impedance at I_ZT, used for precision voltage regulation in power supply reference and overvoltage protection circuits.

For engineers reviewing the 1N4745PE3/TR8 datasheet, 1N4745PE3/TR8 pinout, 1N4745PE3/TR8 application, or 1N4745PE3/TR8 equivalent, key selection factors 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 for automated assembly.

Technical Context

This device operates in reverse breakdown to maintain stable output voltage across wide current (0.25–15.5 mA) and temperature (−65 °C to +150 °C) ranges. Its 16 V nominal Zener voltage exhibits a positive temperature coefficient above 5 V, with typical TC of +5.5 mV/°C per Figure 3.

The DO-41 package provides axial-leaded mounting with cathode band polarity marking, void-free UL94V-0 epoxy body, and solderability verified per MIL-STD-750 Method 2026 at 260 °C for 10 s.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	16 V ±5% at 15.5 mA - defines regulated output level with tight production consistency
Power Dissipation	1.0 W at T_L < 105 °C - limits continuous thermal load on lead-mounted PCB traces
Dynamic Impedance	16 Ω at I_ZT = 15.5 mA - determines output voltage variation under load transients
Reverse Leakage	5 μA max at V_R = 12.2 V - ensures minimal quiescent current in standby regulation
Surge Current (I_SM)	285 mA peak (½-sine, 1/120 s) - supports transient overvoltage clamping without failure
Thermal Resistance	45 °C/W junction-to-lead - enables thermal design using standard 3/8″ lead length from body
Forward Voltage	1.2 V max at 200 mA - defines conduction loss when used in forward-biased protection paths

Pinout & Package

DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by colored 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	Non-banded end	Connected to lower-potential node during Zener operation; carries full regulator current
Cathode	Banded end	Connected to higher-potential node; establishes regulated voltage reference at this terminal

Key Features

Feature	Design Value
JEDEC-registered 1N47xxAP series	Ensures global interchangeability and standardized test conditions per JEDEC JESD24
RoHS-compliant "e3" suffix	Meets EU Directive 2011/65/EU with annealed matte-tin plating, no lead or hazardous substances
Moisture sensitivity Level 1	Eliminates dry-pack requirement and floor-life constraints for SMT handling
Nonsensitive to ESD	Withstands >4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure
Tape-and-reel "TR8" option	Standard EIA-296 packaging for high-speed pick-and-place placement (8 mm tape, 4 mm pitch)

Applications

Power Supply Reference	Overvoltage Clamp
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Provides precise 16 V reference point for error amplifier comparison. Use Value: Maintains ±5% output regulation across 0.25–15.5 mA load range and −65 °C to +150 °C ambient.	Use Scenario: Protecting downstream circuitry from input surges exceeding 16 V. IC Role / Device Role / Timing Role: Shunts excess current to ground when input exceeds 16 V breakdown threshold. Use Value: Absorbs 285 mA surge peaks without degradation, enabling robust front-end protection.
Voltage Monitor Threshold	Signal Level Translation
Use Scenario: Detecting undervoltage or overvoltage conditions in battery-powered systems. IC Role / Device Role / Timing Role: Acts as comparator reference in discrete window detector circuits. Use Value: Delivers stable 16 V threshold with low dynamic impedance (16 Ω), minimizing sensing error.	Use Scenario: Biasing op-amp inputs or shifting logic levels between incompatible voltage domains. IC Role / Device Role / Timing Role: Establishes fixed DC offset or clamps signal swing to 16 V. Use Value: Enables accurate level translation with <1.2 V forward drop and 5 μA leakage at 12.2 V.

Power Supply Reference

Overvoltage Clamp

Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators.

IC Role / Device Role / Timing Role: Provides precise 16 V reference point for error amplifier comparison.

Use Value: Maintains ±5% output regulation across 0.25–15.5 mA load range and −65 °C to +150 °C ambient.

Use Scenario: Protecting downstream circuitry from input surges exceeding 16 V.

IC Role / Device Role / Timing Role: Shunts excess current to ground when input exceeds 16 V breakdown threshold.

Use Value: Absorbs 285 mA surge peaks without degradation, enabling robust front-end protection.

Voltage Monitor Threshold

Signal Level Translation

Use Scenario: Detecting undervoltage or overvoltage conditions in battery-powered systems.

IC Role / Device Role / Timing Role: Acts as comparator reference in discrete window detector circuits.

Use Value: Delivers stable 16 V threshold with low dynamic impedance (16 Ω), minimizing sensing error.

Use Scenario: Biasing op-amp inputs or shifting logic levels between incompatible voltage domains.

IC Role / Device Role / Timing Role: Establishes fixed DC offset or clamps signal swing to 16 V.

Use Value: Enables accurate level translation with <1.2 V forward drop and 5 μA leakage at 12.2 V.

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 "P" (plastic) or "e3" (RoHS) suffix; glass DO-35 package, Sn/Pb plating	Higher thermal resistance (75 °C/W), not RoHS-compliant, moisture-sensitive Level 2a	Select only if legacy glass-body compatibility or non-RoHS requirements apply
MMSZ4705T1G	Surface-mount SOD-123, 16 V ±5%, 1 W, 22 Ω Z_ZT, 300 mA I_SM	Requires PCB rework for SMT layout; lower profile but higher Z_ZT and different thermal path	Choose for space-constrained designs where DO-41 axial leads are impractical

Compared with 1N4745A and MMSZ4705T1G, the 1N4745PE3/TR8 offers superior thermal performance (45 °C/W vs. 75 °C/W), guaranteed RoHS compliance, and tape-and-reel readiness-making it optimal for new industrial power designs requiring reliability, regulatory alignment, and automated assembly.

Availability

1N4745PE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and analog sensor interface circuits requiring stable component supply and long-term obsolescence mitigation.

Supply support for 1N4745PE3/TR8 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 1N47xxAP series was engineered for cost-effective, high-stability voltage regulation in commercial and industrial power conversion, offering JEDEC-standardized performance with enhanced plastic packaging and RoHS compliance.

FAQ

What is the Zener voltage tolerance of the 1N4745PE3/TR8?

The 1N4745PE3/TR8 has a nominal Zener voltage of 16 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is measured 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 1N4745PE3/TR8 require dry packing before use?

No, the 1N4745PE3/TR8 does not require dry packing. It is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and may be stored and assembled without baking or humidity-controlled environments-unlike higher-level MS devices that mandate dry pack and strict handling protocols.

What is the maximum surge current rating for the 1N4745PE3/TR8?

The 1N4745PE3/TR8 has a maximum non-repetitive surge current (I_SM) of 285 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables reliable transient clamping in power rail protection applications without permanent parameter shift or junction damage.

How is polarity marked on the 1N4745PE3/TR8?

The 1N4745PE3/TR8 uses a cathode band to indicate polarity: the banded end is the cathode and must be connected to the higher-potential node during Zener regulation. When operated in forward bias, the anode (non-banded end) connects to the more positive potential, with forward voltage ≤1.2 V at 200 mA per Microsemi's maximum ratings table.

Is the 1N4745PE3/TR8 compatible with lead-free reflow processes?

Yes, the 1N4745PE3/TR8 features RoHS-compliant annealed matte-tin plating and is qualified for soldering at 260 °C for up to 10 seconds, meeting standard lead-free reflow profiles. Its UL94V-0 epoxy body remains stable under these conditions, and no special pre-bake is required due to its Level 1 moisture sensitivity rating.

1N4745PE3/TR8 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)

1N4745PE3/TR8 FAQ

1.How can I place an order for 1N4745PE3/TR8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4745PE3/TR8 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 1N4745PE3/TR8 reliable?

The price and inventory of 1N4745PE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745PE3/TR8 is usually 5 days.

3.What payment methods are accepted for 1N4745PE3/TR8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745PE3/TR8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4745PE3/TR8?

1N4745PE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4745PE3/TR8 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 1N4745PE3/TR8?

For technical support, including 1N4745PE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745PE3/TR8 requirements.

6.How does Aetrix verify that 1N4745PE3/TR8 is sourced from the original manufacturer or authorized distributors?

All 1N4745PE3/TR8 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 1N4745PE3/TR8 meets industry standards.

7.What is the process for return or replacement of 1N4745PE3/TR8?

All 1N4745PE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745PE3/TR8, 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 1N4745PE3/TR8 part is unused and in its original packaging.

Return procedure for 1N4745PE3/TR8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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