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

Microchip Technology 1N4751APE3/TR12

Name: 1N4751APE3/TR12
Brand: Microchip Technology
SKU: 1N4751APE3/TR12
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4751APE3/TR12

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

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

Datasheet:: 1N4751APE3/TR12.pdf

Description:: DIODE ZENER 30V 1W DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:3,725

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Product details

Overview

1N4751APE3/TR12 from Microsemi is a 1.0 W, 30 V ±5% Zener diode in DO-41 plastic package, rated for 8.5 mA test current, 40 Ω dynamic impedance at I_ZT, and 1000 mA maximum regulator current at T_A = 50°C. It provides stable voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.

For engineers reviewing the 1N4751APE3/TR12 datasheet, 1N4751APE3/TR12 pinout, 1N4751APE3/TR12 application, or 1N4751APE3/TR12 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (45°C/W junction-to-lead), RoHS-compliant matte-tin plating, tape-and-reel packaging (TR12), and JEDEC-registered 1N47xxAP family compatibility.

Technical Context

This axial-lead Zener operates in reverse breakdown to maintain a stable 30 V reference across a wide current range (1–1000 mA), with sharp knee characteristics verified by dual-point Zener impedance measurement per MicroNote 202. Its 40 Ω dynamic impedance at 8.5 mA ensures low AC ripple rejection in feedback loops.

The device uses void-free UL94V-0 thermosetting epoxy encapsulation, cathode band polarity marking, and tin-lead or RoHS-compliant annealed matte-tin terminations solderable per MIL-STD-750 Method 2026. Moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - no dry pack required.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	30 V ±5% at I_ZT = 8.5 mA - defines nominal regulation point with tight production control
Power Dissipation	1.0 W at T_L ≤ 105°C (3/8″ lead length) - sets maximum continuous DC power under defined thermal condition
Dynamic Impedance	40 Ω at I_ZT = 8.5 mA - determines AC voltage variation under small-signal ripple conditions
Max Regulator Current	1000 mA at T_A = 50°C - specifies highest safe DC current before thermal runaway
Reverse Leakage	5 μA max at V_R = 22.8 V - ensures minimal quiescent current in standby regulation
Thermal Resistance	45 °C/W junction-to-lead - enables accurate junction temperature estimation from measured lead temperature
Operating Temp	−65°C to +150°C - supports deployment in extended industrial and automotive under-hood environments

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	Forward conduction terminal / Zener cathode reference ground	Connected to circuit ground or lower-potential node when used in standard shunt regulation configuration
Cathode	Zener breakdown terminal / regulation output node	Connected to unregulated input rail; maintains ~30 V relative to anode during reverse conduction

Key Features

Feature	Design Value
JEDEC-registered 1N47xxAP series	Guarantees mechanical and electrical interchangeability with legacy 1N4751A designs using plastic DO-41 package
RoHS-compliant "e3" suffix	Meets EU Directive 2011/65/EU with annealed matte-tin plating - no lead content in terminations
Tape-and-reel "TR12" packaging	Enables automated SMT placement despite axial-leaded form factor via carrier tape compatible with EIA-296 standard
Level 1 moisture sensitivity	Eliminates pre-bake requirement prior to reflow - reduces manufacturing cycle time and cost
Nonsensitive to ESD	Withstands >4 kV HBM per MIL-STD-750 Method 1020 - simplifies handling and board assembly without special precautions

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: Shunt voltage reference providing precise 30 V setpoint to error amplifier input. Use Value: Maintains ±5% output accuracy over load/line variations due to low 40 Ω dynamic impedance and sharp knee characteristic.	Use Scenario: Protecting downstream circuitry from transient voltage spikes exceeding 33 V. IC Role / Device Role / Timing Role: Crowbar element conducting surge current above 30 V to limit voltage excursion. Use Value: Handles 1000 mA peak regulator current and 1000 mA surge current (½-sine, 1/120 s) without degradation.
Signal Level Shifting	Current Source Bias
Use Scenario: Generating fixed bias offsets for op-amp inputs or comparator thresholds in sensor interfaces. IC Role / Device Role / Timing Role: Precision DC voltage source establishing known reference potential relative to ground. Use Value: Delivers stable 30 V with <5 μA leakage at 22.8 V, minimizing loading on high-impedance signal nodes.	Use Scenario: Setting constant current in LED driver or analog sensor excitation circuits. IC Role / Device Role / Timing Role: Voltage-controlled current limiter using series resistor and regulated Zener drop. Use Value: Enables predictable 30 V reference with ±5% tolerance and −65°C to +150°C operating range for robust biasing.

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: Shunt voltage reference providing precise 30 V setpoint to error amplifier input.

Use Value: Maintains ±5% output accuracy over load/line variations due to low 40 Ω dynamic impedance and sharp knee characteristic.

Use Scenario: Protecting downstream circuitry from transient voltage spikes exceeding 33 V.

IC Role / Device Role / Timing Role: Crowbar element conducting surge current above 30 V to limit voltage excursion.

Use Value: Handles 1000 mA peak regulator current and 1000 mA surge current (½-sine, 1/120 s) without degradation.

Signal Level Shifting

Current Source Bias

Use Scenario: Generating fixed bias offsets for op-amp inputs or comparator thresholds in sensor interfaces.

IC Role / Device Role / Timing Role: Precision DC voltage source establishing known reference potential relative to ground.

Use Value: Delivers stable 30 V with <5 μA leakage at 22.8 V, minimizing loading on high-impedance signal nodes.

Use Scenario: Setting constant current in LED driver or analog sensor excitation circuits.

IC Role / Device Role / Timing Role: Voltage-controlled current limiter using series resistor and regulated Zener drop.

Use Value: Enables predictable 30 V reference with ±5% tolerance and −65°C to +150°C operating range for robust biasing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4751A	No "e3" RoHS suffix; tin-lead terminations only; same electrical specs and DO-41 package	Not suitable for RoHS-compliant production; requires leaded solder process	Select when legacy tin-lead assembly is mandated and environmental compliance is not required
MMSZ5256ET1G	Surface-mount SOD-123 package; 30 V ±5%; 500 mW rating; 70 Ω Z_ZT; different thermal profile	Lower power handling (0.5 W vs. 1.0 W); unsuitable for high-current clamping	Choose for space-constrained PCBs where 500 mW suffices and reflow compatibility is prioritized over power margin

Compared with 1N4751A (leaded) and MMSZ5256ET1G (SMT, 0.5 W), the 1N4751APE3/TR12 offers full 1.0 W dissipation, RoHS compliance, and tape-and-reel automation support - making it optimal for industrial power reference and clamp designs requiring regulatory alignment and thermal headroom.

Availability

1N4751APE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and precision reference designs requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant sourcing.

Supply support for 1N4751APE3/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 for general-purpose voltage regulation in ruggedized power systems, emphasizing JEDEC-standard interoperability, thermal robustness, and extended temperature operation.

FAQ

What is the Zener voltage tolerance of the 1N4751APE3/TR12?

The 1N4751APE3/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "A" suffix in its JEDEC part number. This means its nominal 30 V regulation point falls within 28.5 V to 31.5 V at 8.5 mA test current and 25°C lead temperature. The tolerance is guaranteed across the full −65°C to +150°C operating range, supporting reliable performance in demanding thermal environments.

Does the 1N4751APE3/TR12 require dry packing before reflow soldering?

No, the 1N4751APE3/TR12 does not require dry packing before reflow soldering. It is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without baking. This eliminates pre-reflow bake cycles, reducing manufacturing time and cost while maintaining reliability in automated assembly lines.

What is the maximum steady-state current the 1N4751APE3/TR12 can regulate continuously?

The 1N4751APE3/TR12 can regulate up to 1000 mA continuously at an ambient temperature of 50°C when mounted on an FR4 PCB with specified copper pad geometry. At higher temperatures, derating applies per Figure 1 in the datasheet; for example, at 75°C ambient, the safe continuous current drops to approximately 750 mA to maintain junction temperature within limits.

How does the "e3" suffix affect the 1N4751APE3/TR12's termination plating?

The "e3" suffix on the 1N4751APE3/TR12 indicates RoHS-compliant annealed matte-tin plating on its axial leads, replacing traditional tin-lead (Sn/Pb) finishes. This plating meets EU Directive 2011/65/EU requirements and is fully solderable using standard lead-free reflow profiles per MIL-STD-750 Method 2026, ensuring compatibility with modern eco-conscious manufacturing processes.

Can the 1N4751APE3/TR12 be used as a direct replacement for older 1N4751A parts?

Yes, the 1N4751APE3/TR12 is a direct replacement for the legacy 1N4751A in terms of electrical specifications, DO-41 mechanical dimensions, and JEDEC registration. The "P" denotes plastic construction (same as original), "e3" adds RoHS compliance, and "TR12" provides tape-and-reel packaging - all enhancements that preserve full functional and physical compatibility while upgrading environmental and assembly readiness.

1N4751APE3/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):: 30 V

Tolerance:: ±5%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 40 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 22.8 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)

1N4751APE3/TR12 FAQ

1.How can I place an order for 1N4751APE3/TR12 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4751APE3/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 1N4751APE3/TR12 reliable?

The price and inventory of 1N4751APE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4751APE3/TR12 is usually 5 days.

3.What payment methods are accepted for 1N4751APE3/TR12?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4751APE3/TR12 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4751APE3/TR12?

1N4751APE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4751APE3/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 1N4751APE3/TR12?

For technical support, including 1N4751APE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4751APE3/TR12 requirements.

6.How does Aetrix verify that 1N4751APE3/TR12 is sourced from the original manufacturer or authorized distributors?

All 1N4751APE3/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 1N4751APE3/TR12 meets industry standards.

7.What is the process for return or replacement of 1N4751APE3/TR12?

All 1N4751APE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4751APE3/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 1N4751APE3/TR12 part is unused and in its original packaging.

Return procedure for 1N4751APE3/TR12:

1.Submit a request within 90 days.

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

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