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

Microchip Technology 1N4733PE3/TR12

Name: 1N4733PE3/TR12
Brand: Microchip Technology
SKU: 1N4733PE3/TR12
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4733PE3/TR12

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

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

Datasheet:: 1N4733PE3/TR12.pdf

Description:: DIODE ZENER 5.1V 1W DO204AL

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Product details

Overview

1N4733PE3/TR12 from Microsemi is a 5.1 V, ±5% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 49 mA test current, 7 Ω dynamic impedance at I_ZT, and 10 µA reverse leakage at 3.8 V. It provides stable voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.

For engineers reviewing the 1N4733PE3/TR12 datasheet, 1N4733PE3/TR12 pinout, 1N4733PE3/TR12 application, or 1N4733PE3/TR12 equivalent, key selection factors include its 5.1 V nominal Zener voltage, 1 W steady-state dissipation at T_L < 105°C, DO-41 axial-lead mechanical form, RoHS-compliant matte-tin plating, and MIL-PRF-19500 screening compatibility with prefix addition.

Technical Context

This device operates in reverse breakdown to maintain a stable 5.1 V reference across a wide regulation current range (1–178 mA), with low dynamic impedance (7 Ω) ensuring minimal voltage variation under load transients. Its thermal resistance is 45 °C/W junction-to-lead at 10 mm lead length, enabling reliable operation up to +150 °C junction temperature.

The 1N4733PE3/TR12 features a sharp Zener knee (verified by dual-point Z_ZK measurement at 0.25 mA), 1.2 V forward voltage max at 200 mA, and moisture sensitivity level 1 per J-STD-020B-eliminating dry-pack requirements. Polarity is marked by cathode band; regulation requires cathode-positive bias.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	5.1 V ±5% at 49 mA - defines precise regulation point for feedback loops and reference rails
Power Dissipation	1.0 W at T_L < 105°C - supports continuous operation without forced cooling on standard leads
Dynamic Impedance (Z_ZT)	7 Ω at 49 mA - ensures ≤35 mV output shift for ±250 mA load change in shunt regulator designs
Reverse Leakage (I_R)	10 µA max at 3.8 V - guarantees low standby current in battery-backed or low-power sensing circuits
Operating Temperature	−65°C to +150°C - enables deployment in automotive engine compartments and industrial motor controls
Thermal Resistance	45 °C/W junction-to-lead - allows direct thermal path to PCB copper or heatsink via lead termination
Forward Voltage	1.2 V max at 200 mA - supports bidirectional clamping or polarity-sensitive protection configurations

Pinout & Package

DO-41 (JEDEC DO-204AL) plastic axial-lead package with void-free UL94V-0 epoxy body, tin-lead or RoHS-compliant matte-tin plating, and cathode identified by color band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Reference Ground Node	Connected to system ground or lower-potential rail; forms return path during Zener conduction
Cathode	Regulated Output Node	Banded end; connected to input rail or unregulated source; maintains 5.1 V above anode during breakdown

Key Features

Feature	Design Value
JEDEC 1N4733A compliance	Guarantees interchangeability with legacy 1N4733A designs without layout or BOM changes
e3 RoHS-compliant plating	Meets EU RoHS Directive 2011/65/EU with annealed matte-tin finish, solderable per MIL-STD-750 Method 2026
TR12 tape-and-reel packaging	Enables automated SMT placement using EIA-296 standard carrier tape (12 mm width, 1000 pcs/reel)
Level 1 moisture sensitivity	Eliminates baking or dry-pack requirements prior to reflow, reducing assembly cost and handling risk
Nonsensitive to ESD	Withstands >4 kV HBM per MIL-STD-750 Method 1020 - suitable for handling in non-ESD-controlled environments

Applications

Power Supply Reference	Overvoltage Protection
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Shunt reference element providing precise 5.1 V setpoint to error amplifier inputs. Use Value: Maintains ±0.255 V regulation accuracy over 1–178 mA current range, minimizing output drift due to line/load variation.	Use Scenario: Clamping transient surges on 5 V logic rails or sensor supply lines. IC Role / Device Role / Timing Role: Voltage clamp limiting rail excursions above 5.1 V during ESD or inductive kick events. Use Value: Absorbs up to 178 mA surge current (I_ZM) without degradation, protecting downstream CMOS inputs rated for 5.5 V max.
Temperature-Stable Biasing	Industrial Sensor Excitation
Use Scenario: Generating stable bias voltages for op-amp input stages in precision analog front-ends. IC Role / Device Role / Timing Role: Low-drift reference source compensating for amplifier offset drift across −40°C to +85°C. Use Value: Temperature coefficient near zero at 5.1 V (per Figure 3), reducing bias error to <±0.5 mV/°C in calibrated systems.	Use Scenario: Providing regulated excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in PLC modules. IC Role / Device Role / Timing Role: Low-noise, low-impedance voltage source delivering constant current to sensor elements. Use Value: 7 Ω Z_ZT ensures <±35 mV ripple on 5.1 V rail under 100 mA sensor load steps, preserving measurement resolution.

Power Supply Reference

Overvoltage Protection

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

IC Role / Device Role / Timing Role: Shunt reference element providing precise 5.1 V setpoint to error amplifier inputs.

Use Value: Maintains ±0.255 V regulation accuracy over 1–178 mA current range, minimizing output drift due to line/load variation.

Use Scenario: Clamping transient surges on 5 V logic rails or sensor supply lines.

IC Role / Device Role / Timing Role: Voltage clamp limiting rail excursions above 5.1 V during ESD or inductive kick events.

Use Value: Absorbs up to 178 mA surge current (I_ZM) without degradation, protecting downstream CMOS inputs rated for 5.5 V max.

Temperature-Stable Biasing

Industrial Sensor Excitation

Use Scenario: Generating stable bias voltages for op-amp input stages in precision analog front-ends.

IC Role / Device Role / Timing Role: Low-drift reference source compensating for amplifier offset drift across −40°C to +85°C.

Use Value: Temperature coefficient near zero at 5.1 V (per Figure 3), reducing bias error to <±0.5 mV/°C in calibrated systems.

Use Scenario: Providing regulated excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in PLC modules.

IC Role / Device Role / Timing Role: Low-noise, low-impedance voltage source delivering constant current to sensor elements.

Use Value: 7 Ω Z_ZT ensures <±35 mV ripple on 5.1 V rail under 100 mA sensor load steps, preserving measurement resolution.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4733A	No e3 RoHS suffix; Sn/Pb plating only; same electrical specs and DO-41 package	Not compliant with RoHS; restricted in new EU/China-designated products	Select when legacy Sn/Pb assembly process is used and environmental compliance is not required
MMSZ4702T1G	Surface-mount SOD-123 package; 5.1 V ±5%; 500 mW rating; 10 Ω Z_ZT; 10 µA I_R	Lower power rating limits use to low-current references; no axial-lead mounting option	Select for space-constrained PCBs where automated pick-and-place is preferred over through-hole assembly

Compared with 1N4733A and MMSZ4702T1G, the 1N4733PE3/TR12 uniquely combines full RoHS compliance, 1 W power handling, DO-41 mechanical robustness, and tape-and-reel automation support-making it optimal for industrial power supplies requiring long-term component availability and mixed-technology assembly.

Availability

1N4733PE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and precision analog reference designs requiring stable component supply and long lifecycle support.

Supply support for 1N4733PE3/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 ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal stability, ESD resilience, and JEDEC-standard interoperability.

FAQ

What is the Zener voltage tolerance of the 1N4733PE3/TR12?

The 1N4733PE3/TR12 has a nominal Zener voltage of 5.1 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 49 mA test current and 25°C lead temperature, ensuring predictable regulation performance in production-grade power supply designs without requiring post-assembly calibration.

Does the 1N4733PE3/TR12 require dry packing before reflow soldering?

No, the 1N4733PE3/TR12 is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions without dry packing. This eliminates baking steps and reduces manufacturing overhead in high-volume assembly lines handling the 1N4733PE3/TR12.

What is the maximum surge current rating for the 1N4733PE3/TR12?

The 1N4733PE3/TR12 supports a maximum surge current (I_SM) of 178 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25°C ambient. This rating applies during transient overvoltage events and confirms the device's capability to absorb short-duration energy spikes without parametric shift or failure.

Can the 1N4733PE3/TR12 be used in place of the legacy 1N4733A?

Yes, the 1N4733PE3/TR12 is a direct functional and mechanical replacement for the 1N4733A, sharing identical Zener voltage, power rating, DO-41 package dimensions, and pinout. The "e3" suffix adds RoHS compliance and matte-tin plating, while "TR12" denotes EIA-296 tape-and-reel packaging-both enhancements compatible with existing 1N4733A designs.

What is the thermal resistance specification for the 1N4733PE3/TR12?

The 1N4733PE3/TR12 has a thermal resistance of 45 °C/W junction-to-lead when measured at 10 mm (3/8 inch) lead length from the body. This value enables accurate junction temperature estimation in thermal design calculations and confirms suitability for operation up to +150°C junction temperature under specified mounting conditions.

1N4733PE3/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):: 5.1 V

Tolerance:: ±10%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 7 Ohms

Current - Reverse Leakage @ Vr:: 10 µA @ 1 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)

1N4733PE3/TR12 FAQ

1.How can I place an order for 1N4733PE3/TR12 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4733PE3/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 1N4733PE3/TR12 reliable?

The price and inventory of 1N4733PE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733PE3/TR12 is usually 5 days.

3.What payment methods are accepted for 1N4733PE3/TR12?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733PE3/TR12 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4733PE3/TR12?

1N4733PE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4733PE3/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 1N4733PE3/TR12?

For technical support, including 1N4733PE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733PE3/TR12 requirements.

6.How does Aetrix verify that 1N4733PE3/TR12 is sourced from the original manufacturer or authorized distributors?

All 1N4733PE3/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 1N4733PE3/TR12 meets industry standards.

7.What is the process for return or replacement of 1N4733PE3/TR12?

All 1N4733PE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733PE3/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 1N4733PE3/TR12 part is unused and in its original packaging.

Return procedure for 1N4733PE3/TR12:

1.Submit a request within 90 days.

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

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