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

Microchip Technology 1N4739CP/TR12

Name: 1N4739CP/TR12
Brand: Microchip Technology
SKU: 1N4739CP/TR12
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4739CP/TR12

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

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

Datasheet:: 1N4739CP/TR12.pdf

Description:: DIODE ZENER 9.1V 1W DO204AL

Quantity:: RFQ Add To RFQ list

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Product details

Overview

1N4739CP/TR12 from Microsemi is a 1.0 W, 9.1 V ±5% plastic-encapsulated Zener diode in DO-41 package, rated for 28 mA test current, 5.0 Ω dynamic impedance at I_ZT, and 7 μA reverse leakage at 7 V, used for precision voltage regulation in power supply reference and overvoltage protection circuits.

For engineers reviewing the 1N4739CP/TR12 datasheet, 1N4739CP/TR12 pinout, 1N4739CP/TR12 application, or 1N4739CP/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45 °C/W junction-to-lead), surge current rating (500 mA), RoHS-compliant "e3" plating, and tape-and-reel packaging per EIA-296.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain stable 9.1 V output across 1.0–500 mA regulation current range, with a sharp knee at 0.5 mA (Z_ZK = 100 Ω) and temperature coefficient near +5 mV/°C. Its DO-41 axial-leaded plastic package enables through-hole mounting with 0.7 g mass and UL94V-0 epoxy body.

Designed for operation from –65 °C to +150 °C, it delivers 1.0 W steady-state dissipation at T_L < 105 °C (3/8″ lead length) or T_A < 45 °C on FR4 board, with forward voltage ≤1.2 V at 200 mA and solderability verified per MIL-STD-750 Method 2026.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	9.1 V ±5% at 28 mA - defines nominal regulation point with tight tolerance for reference stability
Power Dissipation	1.0 W at T_L ≤ 105 °C - sets maximum continuous thermal load under lead-heatsink conditions
Dynamic Impedance (Z_ZT)	5.0 Ω at I_ZT = 28 mA - indicates low AC impedance for minimal output voltage variation under load transients
Reverse Leakage (I_R)	7 μA at V_R = 7 V - ensures low standby current in undervoltage detection or bias networks
Surge Current (I_SM)	500 mA (½-sine, 1/120 s) - supports transient overvoltage clamping without degradation
Thermal Resistance	45 °C/W junction-to-lead - enables thermal design using lead as primary heat path in PCB layouts
Operating Temperature	–65 °C to +150 °C - qualifies for industrial, automotive under-hood, and military ambient environments

Pinout & Package

DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; terminals are unmarked anode and banded cathode; polarity must be observed-cathode biased positive for Zener operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Reference ground node	Connected to circuit common; serves as return path for Zener current during regulation
Cathode	Regulated output node	Banded terminal; held at stable 9.1 V above anode when reverse-biased above breakdown threshold

Key Features

Feature	Design Value
JEDEC 1N47xxA registration	Ensures cross-manufacturer interchangeability and standardized test conditions per industry baseline
Plastic P-suffix construction	Reduces thermal resistance vs. glass-body variants, improving power handling in compact layouts
RoHS-compliant e3 suffix	Matte-tin plating meets lead-free assembly requirements without compromising solder wetting or reliability
Tape-and-reel TR12 packaging	Enables automated pick-and-place insertion with EIA-296 standard carrier tape geometry
MIL-STD-750 ESD immunity	Nonsensitive to electrostatic discharge per Method 1020-reduces handling precautions in production

Applications

Power Supply Reference	Overvoltage Clamp
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or op-amp-based shunt regulators. IC Role / Device Role / Timing Role: Provides precise 9.1 V reference to error amplifier input for output voltage setpoint control. Use Value: Maintains ±5% regulation accuracy across 1–500 mA load range, minimizing output drift due to line/load changes.	Use Scenario: Protecting microcontroller I/O pins or analog front-end inputs from transient surges. IC Role / Device Role / Timing Role: Shunts excess energy to ground when input exceeds 9.1 V, limiting voltage stress on downstream components. Use Value: Withstands 500 mA surge pulses and exhibits only 7 μA leakage below clamp threshold, preserving signal integrity.
Voltage Monitor Threshold	Current Source Bias
Use Scenario: Detecting brownout conditions in battery-powered systems via comparator input referencing. IC Role / Device Role / Timing Role: Supplies stable 9.1 V to comparator non-inverting input; system triggers reset when supply drops below threshold. Use Value: Low 5.0 Ω dynamic impedance ensures minimal threshold shift under varying source impedance or noise coupling.	Use Scenario: Establishing fixed bias current for LED drivers or transistor amplifiers requiring stable current sink. IC Role / Device Role / Timing Role: Acts as two-terminal current source when series resistor sets operating point above knee voltage. Use Value: Sharp knee at 0.5 mA (Z_ZK = 100 Ω) enables predictable current regulation with <1% deviation across temperature.

Power Supply Reference

Overvoltage Clamp

Use Scenario: Stabilizing feedback voltage in linear regulator ICs or op-amp-based shunt regulators.

IC Role / Device Role / Timing Role: Provides precise 9.1 V reference to error amplifier input for output voltage setpoint control.

Use Value: Maintains ±5% regulation accuracy across 1–500 mA load range, minimizing output drift due to line/load changes.

Use Scenario: Protecting microcontroller I/O pins or analog front-end inputs from transient surges.

IC Role / Device Role / Timing Role: Shunts excess energy to ground when input exceeds 9.1 V, limiting voltage stress on downstream components.

Use Value: Withstands 500 mA surge pulses and exhibits only 7 μA leakage below clamp threshold, preserving signal integrity.

Voltage Monitor Threshold

Current Source Bias

Use Scenario: Detecting brownout conditions in battery-powered systems via comparator input referencing.

IC Role / Device Role / Timing Role: Supplies stable 9.1 V to comparator non-inverting input; system triggers reset when supply drops below threshold.

Use Value: Low 5.0 Ω dynamic impedance ensures minimal threshold shift under varying source impedance or noise coupling.

Use Scenario: Establishing fixed bias current for LED drivers or transistor amplifiers requiring stable current sink.

IC Role / Device Role / Timing Role: Acts as two-terminal current source when series resistor sets operating point above knee voltage.

Use Value: Sharp knee at 0.5 mA (Z_ZK = 100 Ω) enables predictable current regulation with <1% deviation across temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4739A	No "P" suffix → glass-body construction; higher thermal resistance (≈65 °C/W)	Lower power density handling; unsuitable for high-temperature lead-heatsink designs	Select 1N4739CP/TR12 when DO-41 plastic package, RoHS compliance, or tighter thermal management is required
BZX55C9V1	Same 9.1 V/5% spec but 500 mW rating; DO-35 package; 10 Ω Z_ZT	Lower power capability limits use to sub-500 mW regulation or bias roles	Choose BZX55C9V1 only for space-constrained DO-35 layouts where full 1 W dissipation is unnecessary

Compared with 1N4739A and BZX55C9V1, the 1N4739CP/TR12 offers superior thermal performance (45 °C/W), RoHS-compliant plating, and tape-and-reel readiness-making it optimal for high-reliability, automated, and thermally demanding 1 W Zener applications.

Availability

1N4739CP/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and voltage monitor threshold applications requiring stable component supply, consistent Zener voltage tolerance, and RoHS-compliant manufacturing.

Supply support for 1N4739CP/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 developed to deliver JEDEC-standardized, 1 W Zener regulation with enhanced thermal performance and RoHS compliance-targeting ruggedized power management and protection circuits.

FAQ

What is the Zener voltage tolerance of the 1N4739CP/TR12?

The 1N4739CP/TR12 has a nominal Zener voltage of 9.1 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is guaranteed at 28 mA test current and 25 °C lead temperature. The "P" suffix confirms plastic encapsulation, and "TR12" denotes EIA-296 tape-and-reel packaging. This tolerance enables reliable voltage reference use in industrial-grade power supplies where ±5% regulation stability is sufficient.

Does the 1N4739CP/TR12 support lead-free soldering processes?

Yes, the 1N4739CP/TR12 features RoHS-compliant annealed matte-tin plating ("e3" suffix), qualified for lead-free reflow up to 260 °C for 10 seconds per MIL-STD-750 Method 2026. Its UL94V-0 epoxy body withstands thermal cycling without delamination. This makes the 1N4739CP/TR12 suitable for modern SMT assembly lines requiring full RoHS compliance, unlike legacy Sn/Pb-plated variants.

How does the thermal resistance of the 1N4739CP/TR12 compare to glass-body Zeners?

The 1N4739CP/TR12 has a junction-to-lead thermal resistance of 45 °C/W at 3/8″ lead length-significantly lower than the ≈65 °C/W typical of glass-body 1N4739A variants. This 30% improvement stems from the plastic P-suffix package's superior thermal conduction path. For the 1N4739CP/TR12, this means higher sustained power capability in lead-heatsink configurations and reduced risk of thermal runaway in compact PCB layouts.

What is the maximum surge current rating for the 1N4739CP/TR12?

The 1N4739CP/TR12 is rated for a maximum surge current (I_SM) of 500 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating applies under specified test conditions and supports transient overvoltage clamping in protection circuits. Engineers must ensure external series impedance limits peak current to ≤500 mA during surges to preserve long-term reliability of the 1N4739CP/TR12.

Can the 1N4739CP/TR12 be used as a voltage reference in precision analog circuits?

The 1N4739CP/TR12 provides adequate stability for industrial-grade references but lacks the low tempco (<±2 mV/°C) and tight initial tolerance (<±1%) of precision references like the LM385 or TL431. Its +5 mV/°C tempco and ±5% V_Z tolerance make it suitable for non-critical biasing, power supply feedback, or overvoltage thresholds-but not for high-accuracy ADC references. For such uses, the 1N4739CP/TR12 should be calibrated or paired with trimming resistors.

1N4739CP/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):: 9.1 V

Tolerance:: ±2%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 5 Ohms

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

1N4739CP/TR12 FAQ

1.How can I place an order for 1N4739CP/TR12 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4739CP/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 1N4739CP/TR12 reliable?

The price and inventory of 1N4739CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739CP/TR12 is usually 5 days.

3.What payment methods are accepted for 1N4739CP/TR12?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739CP/TR12 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4739CP/TR12?

1N4739CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4739CP/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 1N4739CP/TR12?

For technical support, including 1N4739CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739CP/TR12 requirements.

6.How does Aetrix verify that 1N4739CP/TR12 is sourced from the original manufacturer or authorized distributors?

All 1N4739CP/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 1N4739CP/TR12 meets industry standards.

7.What is the process for return or replacement of 1N4739CP/TR12?

All 1N4739CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739CP/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 1N4739CP/TR12 part is unused and in its original packaging.

Return procedure for 1N4739CP/TR12:

1.Submit a request within 90 days.

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

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