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

Microchip Technology 1N4748PE3/TR8

Name: 1N4748PE3/TR8
Brand: Microchip Technology
SKU: 1N4748PE3/TR8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4748PE3/TR8

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

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

Datasheet:: 1N4748PE3/TR8.pdf

Description:: DIODE ZENER 22V 1W DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:9,753

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Product details

Overview

1N4748PE3/TR8 from Microsemi is a 1.0 W, 22 V ±5% axial-lead Zener diode in DO-41 plastic package, rated for 11.5 mA test current, 23 Ω dynamic impedance at I_ZT, and 5 μA reverse leakage at 16.7 V. It delivers stable voltage regulation in power supply reference, overvoltage protection, and biasing circuits across industrial temperature range.

For engineers reviewing the 1N4748PE3/TR8 datasheet, 1N4748PE3/TR8 pinout, 1N4748PE3/TR8 application, or 1N4748PE3/TR8 equivalent, key selection factors include its 22 V nominal Zener voltage, 1.0 W steady-state power rating at T_L < 105 °C, DO-41 mechanical compatibility, RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR8).

Technical Context

This device operates in reverse breakdown to maintain a stable 22 V reference across load and line variations, with a sharp knee at I_ZK = 0.25 mA and Z_ZK = 41 Ω. Its thermal resistance is 45 °C/W junction-to-lead (3/8″ lead length) and 105 °C/W junction-to-ambient on FR4 board.

Designed for DC voltage regulation, it features low forward voltage (≤1.2 V @ 200 mA), moisture sensitivity Level 1 per J-STD-020B (no dry pack required), and ESD insensitivity per MIL-STD-750 Method 1020.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	22 V ±5% at I_ZT = 11.5 mA - defines precise regulation point under standard test conditions
Power Dissipation	1.0 W at T_L ≤ 105 °C - sets maximum continuous thermal load with 3/8″ lead length
Dynamic Impedance	23 Ω at I_ZT = 11.5 mA - determines output voltage stability under varying current
Reverse Leakage Current	5 μA max at V_R = 16.7 V - ensures minimal parasitic current below regulation threshold
Max Regulator Current	205 mA at T_A = 50 °C - defines peak safe operating current before thermal derating
Thermal Resistance	45 °C/W junction-to-lead - enables accurate thermal design with standard lead mounting
Operating Temperature	−65 °C to +150 °C - supports deployment in extended industrial and automotive environments

Pinout & Package

DO-41 (DO-204AL) plastic axial-lead 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	Forward conduction terminal / Zener cathode reference ground	Connected to circuit ground or lower-potential node during Zener operation
Cathode	Zener regulation terminal / voltage reference output	Banded end; connected to regulated voltage rail; must be held positive relative to anode

Key Features

Feature	Design Value
JEDEC-registered 1N47xxAP series	Ensures mechanical and electrical interchangeability with legacy 1N4748A designs using plastic construction
RoHS-compliant "e3" suffix	Meets EU Directive 2011/65/EU with annealed matte-tin plating and halogen-free epoxy body
Tape-and-reel packaging ("TR8")	Enables automated SMT-compatible placement despite axial-lead form factor via carrier tape
Moisture sensitivity Level 1	Eliminates dry-pack requirement and floor-life constraints for assembly planning
Nonsensitive to ESD	Withstands handling without special precautions per MIL-STD-750 Method 1020

Applications

Power Supply Reference	Overvoltage Protection Clamp
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Zener diode providing fixed 22 V reference to error amplifier input. Use Value: Maintains ±5% output accuracy over −65 °C to +150 °C with 23 Ω dynamic impedance limiting load-induced drift.	Use Scenario: Clamping transient surges on 24 V DC rails in industrial control modules. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground when voltage exceeds 22 V. Use Value: Withstands 205 mA continuous current and 750 mA surge (½-sine, 1/120 s), preventing downstream IC damage.
Bias Voltage Generator	Signal Level Translation
Use Scenario: Establishing gate bias for MOSFET drivers in isolated DC-DC converters. IC Role / Device Role / Timing Role: Providing stable 22 V gate drive reference independent of primary-side fluctuations. Use Value: Low 1.2 V forward voltage ensures fast turn-on during startup; 45 °C/W thermal resistance supports reliable thermal coupling to heatsink.	Use Scenario: Level-shifting logic signals between 3.3 V microcontrollers and 22 V sensor interfaces. IC Role / Device Role / Timing Role: Passive clamping element limiting high-side signal swing to 22 V. Use Value: 5 μA reverse leakage at 16.7 V minimizes quiescent current draw; DO-41 axial leads simplify prototyping and manual repair.

Power Supply Reference

Overvoltage Protection Clamp

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

IC Role / Device Role / Timing Role: Zener diode providing fixed 22 V reference to error amplifier input.

Use Value: Maintains ±5% output accuracy over −65 °C to +150 °C with 23 Ω dynamic impedance limiting load-induced drift.

Use Scenario: Clamping transient surges on 24 V DC rails in industrial control modules.

IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground when voltage exceeds 22 V.

Use Value: Withstands 205 mA continuous current and 750 mA surge (½-sine, 1/120 s), preventing downstream IC damage.

Bias Voltage Generator

Signal Level Translation

Use Scenario: Establishing gate bias for MOSFET drivers in isolated DC-DC converters.

IC Role / Device Role / Timing Role: Providing stable 22 V gate drive reference independent of primary-side fluctuations.

Use Value: Low 1.2 V forward voltage ensures fast turn-on during startup; 45 °C/W thermal resistance supports reliable thermal coupling to heatsink.

Use Scenario: Level-shifting logic signals between 3.3 V microcontrollers and 22 V sensor interfaces.

IC Role / Device Role / Timing Role: Passive clamping element limiting high-side signal swing to 22 V.

Use Value: 5 μA reverse leakage at 16.7 V minimizes quiescent current draw; DO-41 axial leads simplify prototyping and manual repair.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4748A	No "e3" RoHS suffix; Sn/Pb plating; same V_Z, I_ZT, Z_ZT, and DO-41 package	Not compliant with EU RoHS Directive 2011/65/EU; requires exemption documentation for new designs	Select 1N4748A only for legacy repair or non-RoHS programs where Sn/Pb solder is used
MMSZ4702T1G	Surface-mount SOD-123 package; 22 V ±5%; 500 mW rating; 30 Ω Z_ZT at 5 mA	Lower power and smaller footprint; unsuitable for >500 mW dissipation or axial-lead board layouts	Choose MMSZ4702T1G for space-constrained PCBs where thermal load remains ≤500 mW

Compared with 1N4748A and MMSZ4702T1G, the 1N4748PE3/TR8 uniquely combines full 1.0 W power handling, RoHS compliance, tape-and-reel automation support, and proven DO-41 mechanical reliability-making it optimal for industrial power supplies requiring long-term component continuity.

Availability

1N4748PE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and analog bias networks requiring stable component supply, long-lifecycle assurance, and RoHS-compliant procurement.

Supply support for 1N4748PE3/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 Zener series was engineered for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal robustness, JEDEC-standard mechanical compatibility, and extended temperature operation.

FAQ

What is the Zener voltage tolerance of the 1N4748PE3/TR8?

The 1N4748PE3/TR8 has a nominal Zener voltage of 22 V with a tolerance of ±5%, as indicated by the "A" suffix in its base part number. This tolerance is verified at I_ZT = 11.5 mA and T_L = 25 °C. The "e3" suffix confirms RoHS compliance but does not affect voltage tolerance.

Does the 1N4748PE3/TR8 require dry packing before reflow?

No, the 1N4748PE3/TR8 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions without dry pack or floor-life restrictions. This simplifies inventory handling and eliminates baking requirements prior to assembly.

What is the maximum surge current rating for the 1N4748PE3/TR8?

The 1N4748PE3/TR8 is rated for a maximum reverse surge current (I_SM) of 750 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating applies only to short-duration transients and must be derated for repeated events or elevated ambient temperatures.

Can the 1N4748PE3/TR8 replace older 1N4748A parts in existing designs?

Yes-the 1N4748PE3/TR8 is a direct drop-in replacement for 1N4748A in terms of electrical parameters, DO-41 package dimensions, and thermal performance. The only differences are RoHS-compliant matte-tin plating and tape-and-reel packaging; no PCB or schematic changes are needed.

What is the thermal resistance junction-to-ambient for the 1N4748PE3/TR8 on a standard PCB?

When mounted on an FR4 printed circuit board with 1 oz copper, 4 mm² copper pads, and 1 mm track width (25 mm length), the 1N4748PE3/TR8 exhibits a junction-to-ambient thermal resistance of 105 °C/W. This value is critical for calculating safe operating area under continuous 1.0 W dissipation.

1N4748PE3/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):: 22 V

Tolerance:: ±10%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 23 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 16.7 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)

1N4748PE3/TR8 FAQ

1.How can I place an order for 1N4748PE3/TR8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4748PE3/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 1N4748PE3/TR8 reliable?

The price and inventory of 1N4748PE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4748PE3/TR8 is usually 5 days.

3.What payment methods are accepted for 1N4748PE3/TR8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4748PE3/TR8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4748PE3/TR8?

1N4748PE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4748PE3/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 1N4748PE3/TR8?

For technical support, including 1N4748PE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4748PE3/TR8 requirements.

6.How does Aetrix verify that 1N4748PE3/TR8 is sourced from the original manufacturer or authorized distributors?

All 1N4748PE3/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 1N4748PE3/TR8 meets industry standards.

7.What is the process for return or replacement of 1N4748PE3/TR8?

All 1N4748PE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4748PE3/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 1N4748PE3/TR8 part is unused and in its original packaging.

Return procedure for 1N4748PE3/TR8:

1.Submit a request within 90 days.

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

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