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Microchip Technology 1N5239BE3
- Part No.:
- 1N5239BE3
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5239BE3.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,313
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Product details
Overview
1N5239BE3 from Microsemi is a 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 9.1 V nominal Zener voltage at 20 mA test current, with ±5% tolerance (B suffix), 10 Ω dynamic impedance at IZT, and temperature coefficient of +0.068 %/°C. It regulates voltage in low-power reference and protection circuits across industrial and aerospace systems.
For engineers reviewing the 1N5239BE3 datasheet, 1N5239BE3 pinout, 1N5239BE3 application, or 1N5239BE3 equivalent, this page delivers verified electrical specs, thermal derating behavior, RoHS-compliant packaging, and direct alternatives for voltage reference design, overvoltage clamping, and precision biasing where stable 9.1 V regulation under 20 mA is required.
Technical Context
The 1N5239BE3 operates as a two-terminal reverse-biased voltage reference, leveraging avalanche breakdown at 9.1 V to maintain stable output across 0.25–20 mA operating current. Its DO-35 glass package provides hermetic sealing, radiation hardness per MicroNote 050, and ESD insensitivity per MIL-STD-750 Method 1020.
Thermal performance is defined by 250 °C/W junction-to-lead resistance at 3/8″ lead length and 310 °C/W junction-to-ambient on FR4 with specified copper pads. Forward voltage is ≤1.5 V at 200 mA, confirming robust conduction capability outside Zener mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 9.1 V at 20 mA - defines precise regulation point for feedback loops and reference rails |
| Zener Tolerance | ±5% (B suffix) - ensures predictable voltage window for 95% of units without binning |
| Dynamic Impedance | 10 Ω at IZT - limits output voltage shift to <100 mV under ±1 mA load variation |
| Power Dissipation | 500 mW at 25°C - supports continuous operation up to 55°C ambient with linear derating |
| Temperature Coefficient | +0.068 %/°C - predicts +6.2 mV/°C drift above 25°C, critical for temp-stable references |
| Reverse Leakage | 30 μA max at 7.3 V - ensures minimal quiescent current in high-impedance bias networks |
| Package | DO-35 (DO-204AH) glass axial - enables manual insertion, wave soldering, and hermetic reliability |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Banded end | Connected to regulated voltage node; must be held positive relative to anode for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N52xx standard for interchangeability and test methodology |
| RoHS compliance | e3 suffix confirms lead-free matte-tin plating and full RoHS Directive 2011/65/EU adherence |
| Radiation hardness | Inherently radiation-hard per MicroNote 050 - suitable for space-qualified and high-altitude avionics |
| ESD immunity | Nonsensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
| Low capacitance | Typical <2 pF - preserves signal integrity in RF bias and fast-switching clamp applications |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 9.1 V reference for linear regulator error amplifiers or ADC voltage references in industrial PLC modules. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference establishing precise DC bias point. Use Value: Maintains ±0.455 V regulation window over temperature and current, enabling 12-bit ADC accuracy without trimming. | Use Scenario: Protecting microcontroller I/O pins from transient surges in automotive body control modules. IC Role / Device Role / Timing Role: Passive crowbar device clamping input voltage to 9.1 V + forward drop during ESD events. Use Value: Limits peak voltage to <10.6 V at 1 A surge, preventing latch-up in 5 V logic interfaces per ISO 10605. |
| Temperature-Stable Bias | Aerospace Voltage Monitor |
Use Scenario: Generating bias current for op-amp input stages in satellite telemetry amplifiers requiring low drift. IC Role / Device Role / Timing Role: Current-source element using constant-voltage drop across series resistor. Use Value: +0.068 %/°C TC enables <±1.2% current drift over –55°C to +125°C, meeting MIL-PRF-19500 Class H requirements. | Use Scenario: Monitoring bus voltage in radiation-prone spacecraft power distribution units. IC Role / Device Role / Timing Role: Primary voltage sense element feeding comparator inputs for fault detection. Use Value: Hermetic DO-35 package and inherent radiation hardness ensure reliable operation at >100 krad(Si) total ionizing dose. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Same 9.1 V nominal, ±5% tolerance, but 1 W power rating in DO-41 package; higher thermal mass and 20 Ω Zz | Preferred for higher-power dissipation (>500 mW) or PCB layouts accommodating larger DO-41 footprint | Select when board layout allows larger package and system requires margin above 500 mW continuous dissipation |
| MMBZ5239BS | SOT-23 surface-mount variant; same 9.1 V/±5%/10 Ω spec but 200 mW rating and different thermal resistance | Used in space-constrained consumer electronics where reflow compatibility and small size outweigh axial-lead serviceability | Choose for automated assembly and compact designs where 200 mW derated power suffices |
Compared with 1N4739A and MMBZ5239BS, the 1N5239BE3 offers optimal balance of hermetic reliability, radiation tolerance, and axial-lead serviceability for aerospace and high-reliability industrial use-without requiring PCB redesign or sacrificing JEDEC-standard test traceability.
Availability
1N5239BE3 is available at Aetrix Electronics and suitable for industrial power supplies, aerospace voltage monitors, automotive overvoltage clamps, and radiation-hardened instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for 1N5239BE3 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, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N52xx series was designed specifically for mission-critical voltage reference and regulation in environments demanding hermetic sealing, wide temperature operation (–65°C to +175°C), and proven radiation tolerance.
FAQ
What is the maximum steady-state power dissipation for the 1N5239BE3 at 25°C?
The 1N5239BE3 has a maximum steady-state power dissipation of 500 mW at 25°C ambient temperature. This rating applies when leads are trimmed to 3/8 inch (10 mm) from the glass body. Derating is required above 25°C per Figure 1 in the datasheet, reaching zero dissipation at 175°C case temperature.
Does the 1N5239BE3 meet RoHS requirements?
Yes, the 1N5239BE3 meets RoHS Directive 2011/65/EU requirements. The "e3" suffix explicitly denotes RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026, with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances above threshold limits.
What is the Zener impedance of the 1N5239BE3 and how does it affect regulation stability?
The 1N5239BE3 has a dynamic Zener impedance (ZZT) of 10 Ω measured at 20 mA test current. This low value means a 1 mA change in load current causes only a 10 mV shift in output voltage, ensuring tight regulation in precision reference applications where load variations occur.
How is polarity marked on the 1N5239BE3 and what happens if installed backward?
The 1N5239BE3 uses a cathode band to mark the banded end, which must be connected to the more positive potential for Zener operation. If installed backward (anode positive), it behaves as a standard silicon diode with ~1.5 V forward drop at 200 mA and will not regulate-potentially causing circuit malfunction or excessive forward current if uncurrent-limited.
Is the 1N5239BE3 suitable for high-reliability aerospace applications?
Yes, the 1N5239BE3 is inherently radiation-hard per MicroNote 050 and supports optional military screening (e.g., JANTXV) with appropriate prefixes. Its DO-35 hermetic glass package, –65°C to +175°C operating range, and MIL-STD-750 qualified construction make it suitable for aerospace voltage monitoring and biasing where TID tolerance and long-term stability are mandatory.
1N5239BE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bag
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5239BE3 FAQ
1.How can I place an order for 1N5239BE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5239BE3 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 1N5239BE3 reliable?
The price and inventory of 1N5239BE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5239BE3 is usually 5 days.
3.What payment methods are accepted for 1N5239BE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5239BE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5239BE3?
1N5239BE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5239BE3 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 1N5239BE3?
For technical support, including 1N5239BE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5239BE3 requirements.
6.How does Aetrix verify that 1N5239BE3 is sourced from the original manufacturer or authorized distributors?
All 1N5239BE3 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 1N5239BE3 meets industry standards.
7.What is the process for return or replacement of 1N5239BE3?
All 1N5239BE3 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5239BE3, 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 1N5239BE3 part is unused and in its original packaging.
Return procedure for 1N5239BE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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