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Microchip Technology 1N5239B
- Part No.:
- 1N5239B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5239B.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,195
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Product details
Overview
1N5239B from Microsemi is a 500 mW, 9.1 V ±5% glass axial-lead Zener diode in DO-35 (DO-204AH) package, designed for precision voltage regulation and reference applications in low-power analog circuits, power supply feedback paths, and overvoltage protection. It delivers stable regulation at 20 mA test current with 10 Ω dynamic impedance and operates across –65°C to +175°C.
For engineers reviewing the 1N5239B datasheet, 1N5239B pinout, 1N5239B application, or 1N5239B equivalent, this part serves as a standard 9.1 V Zener reference with verified thermal performance, JEDEC registration, RoHS-compliant e3 variants, and MIL-qualified screening options for industrial and aerospace designs.
Technical Context
The 1N5239B operates as a reverse-biased voltage reference with a sharp breakdown knee, characterized by low dynamic impedance (10 Ω @ IZT = 20 mA) and minimal capacitance (≈3 pF typical). Its temperature coefficient of +0.068 %/°C ensures predictable drift behavior above 25°C.
Designed for axial-lead through-hole mounting, it uses hermetically sealed glass construction with tin-lead or matte-tin plating, rated for 260°C soldering (10 s), and exhibits ESD insensitivity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 9.1 V ±5% at 20 mA - defines precise regulation point for feedback and reference circuits |
| Power Dissipation | 0.5 W at 25°C - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance | 10 Ω @ IZT = 20 mA - ensures minimal output voltage variation under load current changes |
| Reverse Current | 30 μA @ VR = 7.6 V - confirms low leakage below breakdown, critical for standby power integrity |
| Temp. Coefficient | +0.068 %/°C - quantifies positive voltage drift with rising temperature, enabling compensation design |
| Operating Temp. | –65°C to +175°C - supports deployment in extended-environment industrial, automotive, and aerospace systems |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by a single black band; operated with banded end positive relative to unbanded end during Zener conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection in reverse bias | Connected to higher-potential node; regulates voltage drop across device when reverse biased |
| Anode (unbanded end) | Zener cathode connection in reverse bias | Connected to lower-potential node (e.g., ground or return path); completes regulation loop |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Guarantees full parameter compliance (VZ, IR, ZZT, ZZK, αVZ, VF) per industry-standard qualification |
| Hermetic glass DO-35 construction | Enables long-term reliability in humid, corrosive, or high-vibration environments without encapsulation |
| Radiation-hardened per MicroNote 050 | Supports operation in space-grade and nuclear instrumentation applications without parametric shift |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for on-board ESD protection circuitry in handling and assembly stages |
| RoHS-compliant e3 variants available | Meets EU environmental directives without sacrificing electrical or thermal performance |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in linear regulators or switching converter feedback loops. IC Role / Device Role / Timing Role: Precision voltage reference providing stable setpoint for error amplifier comparison. Use Value: Maintains ±5% output accuracy over temperature and line/load variations using 9.1 V Zener threshold. |
Use Scenario: Protecting downstream ICs from transient overvoltage events on supply rails. IC Role / Device Role / Timing Role: Shunt clamping element that conducts excess current above 9.1 V to limit rail excursion. Use Value: Limits peak voltage to ≤9.1 V + ICLAMP × 10 Ω, preventing damage to 10 V-rated components. |
| Voltage Reference Source | Signal Level Translation |
Use Scenario: Providing stable bias points for op-amp comparators, ADC references, or sensor excitation. IC Role / Device Role / Timing Role: Low-drift, low-noise DC reference node in analog signal chains. Use Value: Delivers 9.1 V reference with +0.068 %/°C TC and <3 pF capacitance, minimizing noise coupling. |
Use Scenario: Shifting logic-level signals between incompatible voltage domains (e.g., 12 V → 5 V interface). IC Role / Device Role / Timing Role: Clamping diode establishing defined upper rail for level-shifted signals. Use Value: Fixes maximum signal swing at 9.1 V while allowing bidirectional AC coupling via series capacitor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A (ON Semiconductor) | Same 9.1 V nominal, ±5% tolerance, but DO-41 package (larger, higher thermal resistance: 350 °C/W vs. 250 °C/W) | Less suitable for high-density PCBs or elevated ambient temperatures due to inferior thermal performance | Select 1N5239B when board space, thermal management, or military screening (e.g., JANTXV) is required |
| BZX55C9V1 (Vishay) | 9.1 V ±5%, DO-35 package, but higher max Zener impedance (15 Ω vs. 10 Ω) and wider temp coefficient range (±0.06% to +0.10%/°C) | May introduce greater regulation error under dynamic load or wide temperature swings | Choose 1N5239B where tighter dynamic impedance control and consistent +0.068%/°C TC are critical |
Compared with 1N4739A and BZX55C9V1, the 1N5239B offers superior thermal resistance, lower dynamic impedance, and a precisely specified positive temperature coefficient-making it preferred for compact, high-reliability, and thermally demanding Zener reference designs.
Availability
1N5239B is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and precision voltage reference applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 1N5239B 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 radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5239B belongs to Microsemi's legacy 1N52xxB Zener diode family, engineered for precision voltage regulation in mission-critical systems where stability, JEDEC compliance, and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance and test condition for the 1N5239B?
The 1N5239B has a nominal Zener voltage of 9.1 V with a guaranteed tolerance of ±5%, measured at a test current (IZT) of 20 mA and ambient temperature of 25°C. This tolerance is confirmed per JEDEC specification for suffix "B" devices, covering all six electrical parameters including VZ, IR, ZZT, ZZK, αVZ, and VF.
Does the 1N5239B support military-grade screening options?
Yes-the 1N5239B supports MIL-PRF-19500 screening levels when ordered with appropriate prefixes: MQ (JAN), MX (JANTX), MV (JANTXV), or MSP (JANS), all requiring the "-1" suffix for internal bond options. These versions maintain identical 9.1 V regulation and thermal specs while adding enhanced reliability testing and lot traceability.
What is the maximum power dissipation and thermal resistance of the 1N5239B?
The 1N5239B is rated for 0.5 W power dissipation at 25°C, with thermal resistance of 250°C/W junction-to-lead (measured at 3/8″ lead length) and 310°C/W junction-to-ambient on FR4 board. Derating begins above 25°C per Figure 1 in the datasheet, reaching zero power at 175°C case temperature.
Is the 1N5239B RoHS compliant, and how is compliance indicated?
Yes-RoHS-compliant versions of the 1N5239B are available with the "e3" suffix (e.g., 1N5239Be3), indicating annealed matte-tin plating per MIL-STD-750 Method 2026. These parts meet EU Directive 2011/65/EU requirements without performance trade-offs in voltage regulation or thermal behavior.
How does the temperature coefficient of the 1N5239B affect its regulation accuracy?
The 1N5239B has a specified temperature coefficient of +0.068 %/°C, meaning its Zener voltage increases by approximately 6.2 mV per °C rise above 25°C. This predictable positive drift allows designers to compensate system-level errors in temperature-sensitive references or select complementary components for net-zero drift designs.
1N5239B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5239B FAQ
1.How can I place an order for 1N5239B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5239B 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 1N5239B reliable?
The price and inventory of 1N5239B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5239B is usually 5 days.
3.What payment methods are accepted for 1N5239B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5239B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5239B?
1N5239B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5239B 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 1N5239B?
For technical support, including 1N5239B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5239B requirements.
6.How does Aetrix verify that 1N5239B is sourced from the original manufacturer or authorized distributors?
All 1N5239B 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 1N5239B meets industry standards.
7.What is the process for return or replacement of 1N5239B?
All 1N5239B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5239B, 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 1N5239B part is unused and in its original packaging.
Return procedure for 1N5239B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5239B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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