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

Microchip Technology 1N5259A/TR

Name: 1N5259A/TR
Brand: Microchip Technology
SKU: 1N5259A/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5259A/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: 1N5259A/TR.pdf

Description:: DIODE ZENER 39V 500MW DO204AH

Quantity:: RFQ Add To RFQ list

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Inventory:5,014

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Product details

Overview

1N5259A/TR from Microsemi is a 39 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 3.2 mA test current, 80 Ω dynamic impedance at IZK, and operating across –65 °C to +175 °C - used for precision voltage reference and overvoltage protection in low-power analog circuits.

For engineers reviewing the 1N5259A/TR datasheet, 1N5259A/TR pinout, 1N5259A/TR application, or 1N5259A/TR equivalent, key selection factors include its 39 V nominal Zener voltage with 10% tolerance, 80 Ω Zener impedance at 0.25 mA, thermal resistance of 250 °C/W (junction-to-lead), and RoHS-compliant "e3" variant availability via suffix extension.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain stable voltage regulation across wide current and temperature ranges. Its DO-35 glass package provides hermetic sealing and inherent radiation hardness per MicroNote 050, with cathode band polarity marking and tin-lead or matte-tin plating for solderability.

Electrical behavior is defined by JEDEC-standardized parameters: V_Z = 39 V @ I_ZT = 3.2 mA, Z_ZT = 80 Ω @ I_ZK = 0.25 mA, I_R ≤ 0.1 μA @ V_R = 29 V, and temperature coefficient αV_Z = +0.094 %/°C - confirming positive drift above 6 V, typical for higher-voltage Zeners.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	39 V @ 3.2 mA test current - defines primary regulation point under standard bias conditions.
Tolerance	±10% (A suffix) - sets absolute voltage window: 35.1 V to 42.9 V at 25 °C.
Power Dissipation	500 mW at 25 °C - limits continuous power handling before thermal derating applies.
Zener Impedance	80 Ω @ 0.25 mA - indicates dynamic resistance near knee; impacts regulation stability at low currents.
Reverse Leakage	≤0.1 μA @ 29 V - ensures minimal standby current in shunt regulation applications.
Temp. Coefficient	+0.094 %/°C - quantifies voltage drift magnitude per degree rise; requires compensation in precision references.
Operating Temp.	–65 °C to +175 °C - supports aerospace, downhole, and high-reliability industrial environments.

Pinout & Package

DO-35 (DO-204AH) hermetically sealed glass axial-lead package with cathode indicated by colored band; leads are tinned copper, solderable per MIL-STD-750 Method 2026.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Non-banded lead	Connected to circuit ground or lower potential node in shunt regulator configuration.
Cathode	Banded lead	Connected to regulated voltage node; Zener conducts when cathode is ≥39 V above anode.

Key Features

Feature	Design Value
JEDEC-registered device	Guarantees compliance with industry-standard electrical limits and mechanical dimensions for 1N52xx series.
Hermetic glass construction	Enables operation up to +175 °C and intrinsic radiation hardness per MicroNote 050 - critical for space-grade designs.
Low capacitance	Typical C_J < 5 pF (per Figure 2) - preserves high-frequency signal integrity in RF bias and timing circuits.
ESD robustness	Nonsensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in assembly handling.
Tape-and-reel packaging	"TR" suffix denotes EIA-296 compliant reel format - enables automated SMT placement despite axial-leaded form factor.

Applications

Industrial Power Supply Reference	Automotive Sensor Biasing
Use Scenario: Providing stable 39 V reference for op-amp feedback networks in isolated DC-DC converters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise output setpoint independent of load variation. Use Value: Maintains ±10% regulation accuracy across –40 °C to +125 °C ambient, supporting Class A industrial grade certification.	Use Scenario: Biasing pressure transducer bridges in engine control units exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Zener clamp protecting ADC input from transient overvoltage during load dump events. Use Value: Withstands 175 °C junction temperature and exhibits <0.1 μA leakage at 29 V - minimizing sensor offset error.
Aerospace Voltage Clamp	Test Equipment Calibration
Use Scenario: Protecting flight computer analog inputs against ESD and lightning-induced surges in avionics bays. IC Role / Device Role / Timing Role: Transient voltage suppressor leveraging inherent radiation hardness and wide temp range. Use Value: Radiation-hardened per MicroNote 050 and qualified to MIL-PRF-19500 screening levels when ordered with MQ/MX prefixes.	Use Scenario: Serving as traceable 39 V calibration standard in bench multimeters and programmable power supplies. IC Role / Device Role / Timing Role: Precision voltage reference with documented ±10% tolerance and +0.094 %/°C TC for lab-grade accuracy. Use Value: Enables NIST-traceable calibration without active temperature compensation due to predictable drift profile.

Industrial Power Supply Reference

Automotive Sensor Biasing

Use Scenario: Providing stable 39 V reference for op-amp feedback networks in isolated DC-DC converters.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise output setpoint independent of load variation.

Use Value: Maintains ±10% regulation accuracy across –40 °C to +125 °C ambient, supporting Class A industrial grade certification.

Use Scenario: Biasing pressure transducer bridges in engine control units exposed to under-hood temperatures.

IC Role / Device Role / Timing Role: Zener clamp protecting ADC input from transient overvoltage during load dump events.

Use Value: Withstands 175 °C junction temperature and exhibits <0.1 μA leakage at 29 V - minimizing sensor offset error.

Aerospace Voltage Clamp

Test Equipment Calibration

Use Scenario: Protecting flight computer analog inputs against ESD and lightning-induced surges in avionics bays.

IC Role / Device Role / Timing Role: Transient voltage suppressor leveraging inherent radiation hardness and wide temp range.

Use Value: Radiation-hardened per MicroNote 050 and qualified to MIL-PRF-19500 screening levels when ordered with MQ/MX prefixes.

Use Scenario: Serving as traceable 39 V calibration standard in bench multimeters and programmable power supplies.

IC Role / Device Role / Timing Role: Precision voltage reference with documented ±10% tolerance and +0.094 %/°C TC for lab-grade accuracy.

Use Value: Enables NIST-traceable calibration without active temperature compensation due to predictable drift profile.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5259B/TR	±5% tolerance (vs. ±10% for 1N5259A/TR); identical V_Z, I_ZT, Z_ZT, and package.	Higher precision required in feedback loops where 35.1–42.9 V window is insufficient.	Select 1N5259B/TR when tighter regulation is needed without changing layout or thermal design.
MMBZ5259BS-7-F	SOT-23 surface-mount package; same 39 V/±10% spec but lower 225 mW P_D and 100 Ω Z_ZT.	Space-constrained PCBs where axial leads are incompatible with automated assembly flow.	Choose MMBZ5259BS-7-F only if board real estate and reflow compatibility outweigh power and impedance trade-offs.

Compared with 1N5259B/TR and MMBZ5259BS-7-F, the 1N5259A/TR delivers optimal balance of high-temperature capability (175 °C), hermetic reliability, and cost-effective axial-leaded manufacturability - making it preferred for ruggedized power and aerospace systems where long-term stability trumps miniaturization.

Availability

1N5259A/TR is available at Aetrix Electronics and suitable for industrial power supply reference, automotive sensor biasing, aerospace voltage clamping, and test equipment calibration requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for 1N5259A/TR 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, radiation-hardened, and high-temperature analog and mixed-signal components.

The 1N52xx series was designed specifically for mission-critical voltage regulation in aerospace, defense, and industrial systems demanding extended temperature operation and hermetic reliability.

FAQ

What is the Zener voltage tolerance of the 1N5259A/TR?

The 1N5259A/TR has a nominal Zener voltage of 39 V with a guaranteed tolerance of ±10%, meaning its actual breakdown voltage falls between 35.1 V and 42.9 V at 25 °C and 3.2 mA test current. This tolerance is defined by the "A" suffix per Microsemi's documentation and applies across the full operating temperature range unless otherwise compensated.

Does the 1N5259A/TR require heatsinking in standard applications?

No, the 1N5259A/TR does not require external heatsinking in standard applications because its 500 mW power rating is thermally managed through its DO-35 package's 250 °C/W junction-to-lead thermal resistance. At 25 °C ambient and 3.2 mA current, power dissipation is only ~125 mW - well within safe limits. Derating begins above 50 °C lead temperature per Figure 1.

Can the 1N5259A/TR be used in surface-mount designs?

The 1N5259A/TR itself is an axial-leaded DO-35 device and is not surface-mount compatible. However, Microsemi offers the MLL5259B in DO-213AA (MELF) package as a direct surface-mount equivalent with identical 39 V/±10% specs. The "TR" suffix on 1N5259A/TR refers to tape-and-reel packaging - not SMT mounting capability.

What is the maximum reverse leakage current for the 1N5259A/TR?

The maximum reverse leakage current for the 1N5259A/TR is 0.1 μA measured at 29 V reverse voltage (V_R) and 25 °C. This ultra-low leakage ensures minimal power loss in high-impedance bias networks and preserves accuracy in precision reference applications where even nanoamp-level currents affect performance.

Is the 1N5259A/TR RoHS compliant?

Yes, the 1N5259A/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5259Ae3/TR). The base part number without "e3" uses traditional tin-lead plating; the "e3" designation confirms annealed matte-tin plating per RoHS Directive 2011/65/EU and solderability per MIL-STD-750 Method 2026.

1N5259A/TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 39 V

Tolerance:: ±10%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 29 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AH (DO-35)

1N5259A/TR FAQ

1.How can I place an order for 1N5259A/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5259A/TR 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 1N5259A/TR reliable?

The price and inventory of 1N5259A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5259A/TR is usually 5 days.

3.What payment methods are accepted for 1N5259A/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5259A/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5259A/TR?

1N5259A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5259A/TR 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 1N5259A/TR?

For technical support, including 1N5259A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5259A/TR requirements.

6.How does Aetrix verify that 1N5259A/TR is sourced from the original manufacturer or authorized distributors?

All 1N5259A/TR 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 1N5259A/TR meets industry standards.

7.What is the process for return or replacement of 1N5259A/TR?

All 1N5259A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5259A/TR, 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 1N5259A/TR part is unused and in its original packaging.

Return procedure for 1N5259A/TR:

1.Submit a request within 90 days.

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

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