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Microchip Technology 1N5239A/TR
- Part No.:
- 1N5239A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5239A/TR.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:8,571
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Product details
Overview
1N5239A/TR from Microsemi is a 9.1 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current, 10 Ω dynamic impedance at IZK, and operating from –65°C to +175°C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback loops, and overvoltage protection.
For engineers reviewing the 1N5239A/TR datasheet, 1N5239A/TR pinout, 1N5239A/TR application, or 1N5239A/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (250°C/W junction-to-lead), reverse leakage (≤5 μA at 7.3 V), temperature coefficient (+0.068%/°C), and RoHS-compliant "e3" availability with tape-and-reel packaging.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its DO-35 glass package provides hermetic sealing, ESD insensitivity per MIL-STD-750 Method 1020, and inherent radiation hardness per MicroNote 050.
It delivers regulation with 10 Ω Zener impedance at 0.25 mA knee current (ZZK), 6.7 V maximum Zener voltage at IZK, and forward voltage ≤1.5 V at 200 mA - enabling reliable clamping and reference functions in compact, high-reliability designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 9.1 V @ 20 mA - defines regulated output voltage under standard test conditions |
| Zener Tolerance | ±10% (A suffix) - sets absolute voltage accuracy band for design margining |
| Power Dissipation | 500 mW at 25°C - limits continuous power handling before thermal derating applies |
| Zener Impedance | 10 Ω @ IZK = 0.25 mA - determines voltage stability under small-signal variations |
| Temp. Coefficient | +0.068 %/°C - quantifies drift rate of VZ over temperature for precision reference use |
| Reverse Leakage | ≤5 μA @ 7.3 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Operating Temp. | –65°C to +175°C - supports deployment in aerospace, downhole, and industrial environments |
Pinout & Package
Hermetically sealed DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by a single black 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 | Non-banded lead | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Banded lead | Connected to regulated voltage node; must be held positive relative to anode for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered device | Guarantees standardized electrical limits and mechanical compatibility across qualified suppliers |
| RoHS-compliant option | "e3" suffix enables compliance with environmental directives without performance trade-offs |
| Tape-and-reel packaging | "TR" suffix supports automated SMT placement despite axial-leaded form factor |
| Radiation-hardened construction | Inherent hardness per MicroNote 050 allows use in space-grade and nuclear instrumentation systems |
| ESD-insensitive design | No special handling required per MIL-STD-750 Method 1020 - simplifies manufacturing and field service |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in linear regulators or switching converter feedback paths using resistive divider networks. IC Role / Device Role / Timing Role: Shunt reference element providing stable 9.1 V reference point for error amplifier comparison. Use Value: Enables ±10% output regulation accuracy with minimal external components and no active circuitry. | Use Scenario: Protecting sensitive inputs of op-amps, ADCs, or microcontrollers from transient overvoltage events. IC Role / Device Role / Timing Role: Passive clamping device that conducts above 9.1 V to limit voltage excursion. Use Value: Limits peak input voltage to ≤9.1 V + forward drop, preventing latch-up or damage without response delay. |
| Temperature-Stable Reference | Low-Power Bias Network |
Use Scenario: Providing a stable bias voltage for sensor signal conditioning circuits operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Precision voltage reference with +0.068%/°C tempco for offset calibration and gain setting. Use Value: Maintains reference stability within ±1.7% over –65°C to +125°C, reducing system calibration frequency. | Use Scenario: Establishing fixed bias points for discrete transistor amplifiers or comparator hysteresis networks. IC Role / Device Role / Timing Role: Low-current shunt regulator delivering consistent 9.1 V at <1 mA quiescent draw. Use Value: Draws only ≤5 μA at 7.3 V reverse bias, minimizing loading on high-impedance source nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Same 9.1 V nominal, ±5% tolerance (B suffix), 1 W power rating, DO-41 package | Higher power dissipation supports higher current regulation but requires larger PCB footprint | Select when >500 mW power handling or legacy DO-41 layout compatibility is required |
| MMBZ5239BS | Same 9.1 V, ±10%, SOT-23 surface-mount package, 200 mW rating, 15 Ω ZZK | Enables miniaturized PCB layouts but reduces thermal mass and power capability | Select for space-constrained consumer or portable electronics where reflow compatibility is critical |
Compared with 1N4739A and MMBZ5239BS, the 1N5239A/TR offers optimal balance of axial-leaded reliability, hermetic DO-35 packaging, and tight thermal resistance (250°C/W) for high-temperature industrial use - while maintaining JEDEC-standardized parametric consistency across military screening grades.
Availability
1N5239A/TR is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and temperature-stable reference applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for 1N5239A/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 aerospace-grade components.
The 1N52xx series was designed for mission-critical voltage regulation in harsh-environment electronics, emphasizing hermeticity, wide temperature operation, and JEDEC-standardized parametric repeatability.
FAQ
What is the Zener voltage tolerance for 1N5239A/TR?
The "A" suffix in 1N5239A/TR specifies a nominal Zener voltage tolerance of ±10% at 20 mA test current. This means the actual measured VZ falls between 8.19 V and 10.01 V under standard test conditions, supporting robust design margining in non-precision regulation tasks.
Does 1N5239A/TR support RoHS compliance?
Yes - the 1N5239A/TR is available in RoHS-compliant form with the "e3" suffix (e.g., 1N5239Ae3/TR), featuring annealed matte-tin plating per MIL-STD-750 Method 2026 and full compliance with EU Directive 2011/65/EU.
What is the maximum reverse leakage current for 1N5239A/TR?
The maximum reverse leakage current for 1N5239A/TR is 5 μA when measured at VR = 7.3 V (80% of nominal VZ), per the manufacturer's electrical characteristics table. This low leakage preserves signal integrity in high-impedance bias networks.
Can 1N5239A/TR be used in high-temperature environments?
Yes - the 1N5239A/TR is rated for continuous operation from –65°C to +175°C, with thermal resistance of 250°C/W junction-to-lead at 3/8″ lead length. Its hermetic DO-35 glass package ensures reliability in downhole, engine-control, and aerospace applications.
What does the "TR" suffix indicate in 1N5239A/TR?
The "TR" suffix in 1N5239A/TR denotes tape-and-reel packaging per EIA-296 standard, enabling automated pick-and-place assembly. This format supports high-volume production while preserving the axial-leaded DO-35 mechanical configuration and electrical specifications of the base 1N5239A device.
1N5239A/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):
- 9.1 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.7 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)
1N5239A/TR FAQ
1.How can I place an order for 1N5239A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5239A/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 1N5239A/TR reliable?
The price and inventory of 1N5239A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5239A/TR is usually 5 days.
3.What payment methods are accepted for 1N5239A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5239A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5239A/TR?
1N5239A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5239A/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 1N5239A/TR?
For technical support, including 1N5239A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5239A/TR requirements.
6.How does Aetrix verify that 1N5239A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5239A/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 1N5239A/TR meets industry standards.
7.What is the process for return or replacement of 1N5239A/TR?
All 1N5239A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5239A/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 1N5239A/TR part is unused and in its original packaging.
Return procedure for 1N5239A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5239A/TR Tags
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