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Microchip Technology 1N5259A
- Part No.:
- 1N5259A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5259A.pdf
- Description:
- DIODE ZENER 39V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,570
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Product details
Overview
1N5259A 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. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.
For engineers reviewing the 1N5259A datasheet, 1N5259A pinout, 1N5259A application, or 1N5259A equivalent, key selection criteria include its 39 V nominal Zener voltage with ±10% tolerance (A suffix), 500 mW power rating at 25°C, DO-35 mechanical form factor, temperature coefficient of +0.094 %/°C, and suitability for high-reliability industrial and aerospace environments per MIL-PRF-19500 screening options.
Technical Context
The 1N5259A operates as a reverse-biased silicon Zener diode with sharp breakdown knee and stable regulation over 0.25–20 mA operating current range. Its 80 Ω Zener impedance at 0.25 mA (ZZK) and 3.2 mA test current (IZT) ensure predictable voltage clamping under light-load conditions.
Designed for axial-leaded through-hole mounting, it features hermetically sealed glass construction, tin-lead or RoHS-compliant matte-tin plating, cathode band polarity marking, and inherent radiation hardness per MicroNote 050 - enabling use in harsh thermal and radiation environments without derating penalties.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 39 V @ 3.2 mA test current - defines regulated output voltage under standard bias condition |
| 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 ambient - limits continuous power handling before thermal derating begins |
| Zener Impedance (ZZK) | 80 Ω @ IZK = 0.25 mA - indicates dynamic resistance near knee, critical for low-current regulation stability |
| Temperature Coefficient (αVZ) | +0.094 %/°C - quantifies voltage drift with temperature; positive sign means VZ increases with heat |
| Operating Temperature | –65°C to +175°C - supports extended-range operation in automotive engine bays or downhole electronics |
| Forward Voltage | ≤1.5 V @ 200 mA - ensures low-loss conduction when forward-biased during transient events |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package: hermetically sealed cylindrical glass body with tinned copper alloy leads; cathode identified by single black band; lead length ≥10 mm (3/8″) required for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current entry terminal in forward bias; referenced ground node in shunt regulation | Connected to circuit ground or lower-potential rail; must sink full load current during Zener conduction |
| Cathode (banded end) | Regulated voltage output node in reverse bias; higher-potential terminal | Connected to voltage node requiring stabilization; carries reverse leakage and regulation current |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xx series compliance | Guarantees standardized electrical limits, mechanical dimensions, and test methodology across manufacturers |
| Hermetic glass DO-35 packaging | Enables long-term reliability in humid, corrosive, or high-vacuum environments without encapsulation degradation |
| Inherent radiation hardness | Validated per MicroNote 050 - eliminates need for external radiation shielding in space or nuclear instrumentation |
| ESD insensitivity (MIL-STD-750 Method 1020) | Withstands human-body-model ESD events without parameter shift - simplifies handling and assembly |
| Minimal junction capacitance | Typical <1.5 pF (per Figure 2) - preserves high-frequency signal integrity in RF bias or fast transient suppression |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Stabilizing error amplifier input in isolated DC-DC converter feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 39 V reference to optocoupler input. Use Value: Enables ±1% output regulation despite line/load variation, leveraging tight 39 V ±10% tolerance and low ZZK for stability at light loads. |
Use Scenario: Providing stable bias voltage for radiation-hardened op-amps in satellite telemetry circuits. IC Role / Device Role / Timing Role: Primary voltage reference in analog sensor signal conditioning chain. Use Value: Delivers guaranteed operation from –65°C to +175°C and survives total ionizing dose >100 krad(Si), per MicroNote 050. |
| Automotive Overvoltage Clamp | Test Equipment Calibration Standard |
Use Scenario: Protecting microcontroller I/O pins against load-dump transients in 24 V vehicle systems. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting surge energy above 39 V threshold. Use Value: Responds within nanoseconds due to low junction capacitance (<1.5 pF), limiting voltage overshoot to ≤42.9 V (max VZ). |
Use Scenario: Serving as traceable secondary reference in portable multimeter calibration fixtures. IC Role / Device Role / Timing Role: Stable 39 V Zener standard replacing bulkier precision references. Use Value: Maintains ±10% tolerance over –65°C to +175°C with <0.1 μA IR @ 31.2 V, enabling field-deployable accuracy verification. |
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 | ±5% tolerance (vs. ±10% for 1N5259A); otherwise identical electrical and mechanical specs | Required where tighter voltage accuracy is needed for precision feedback or calibration | Select 1N5259B when system-level voltage error budget demands <±2 V deviation at 39 V nominal |
| MMBZ5259BS | Surface-mount SOD-123 package; same 39 V/±10% spec but 200 mW power rating | Used in space-constrained PCBs where DO-35 axial leads are incompatible with automated assembly | Choose MMBZ5259BS only if board layout prohibits axial-leaded components and thermal load remains ≤200 mW |
Compared with 1N5259B and MMBZ5259BS, the 1N5259A offers the broadest operational temperature range (–65°C to +175°C) and highest power rating (500 mW) in the 39 V Zener class, making it optimal for high-reliability through-hole designs where thermal margin and environmental robustness are prioritized over footprint size or ultra-tight tolerance.
Availability
1N5259A is available at Aetrix Electronics and suitable for industrial power supplies, aerospace avionics, and automotive control modules requiring stable component supply with long lifecycle visibility and MIL-qualified screening options.
Supply support for 1N5259A 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-voltage analog components for defense, aerospace, and industrial markets.
The 1N52xx series was designed specifically for ruggedized voltage regulation in mission-critical systems - emphasizing wide temperature operation, hermetic packaging, and compatibility with MIL-PRF-19500 screening standards.
FAQ
What is the maximum reverse current (IR) specification for the 1N5259A at its rated Zener voltage?
The 1N5259A has a maximum reverse current of 0.1 μA when measured at 31.2 V (80% of its nominal 39 V Zener voltage). This ultra-low leakage ensures minimal power loss in standby or high-impedance reference circuits, directly supporting battery-powered and low-quiescent-current designs where every nanoamp matters.
Does the 1N5259A support military-grade screening, and how is it ordered?
Yes - the 1N5259A supports MIL-PRF-19500 screening when ordered with appropriate prefixes: MQ (JAN), MX (JANTX), MV (JANTXV), or MSP (JANS), all requiring the "-1" suffix for internal bond options. These variants retain identical 39 V Zener characteristics while adding rigorous environmental and burn-in testing for defense and space applications.
What is the thermal resistance (θJL) of the 1N5259A, and how does it affect PCB layout?
The 1N5259A has a junction-to-lead thermal resistance of 250 °C/W at 3/8″ (10 mm) lead length from the glass body. To maintain 500 mW power rating, PCB traces must provide adequate copper area - Microsemi specifies 4 mm² pads with 1 mm wide × 25 mm long traces on FR4 with 1 oz Cu to achieve 310 °C/W junction-to-ambient resistance.
Can the 1N5259A be used in surface-mount designs?
No - the 1N5259A is exclusively a through-hole DO-35 axial-leaded device. For surface-mount equivalents, Microsemi offers the MLL5259B in DO-213AA (MELF) package, which shares identical 39 V/±10% specs but requires requalification for thermal and mechanical performance in reflow-soldered assemblies.
How does the +0.094 %/°C temperature coefficient impact voltage regulation accuracy over temperature?
The +0.094 %/°C coefficient means the 1N5259A's Zener voltage increases by approximately 36.7 mV per °C rise (0.094% × 39 V). Over a –55°C to +125°C range, this yields a total drift of ±1.7 V - a critical factor when designing closed-loop regulators or precision references where absolute voltage stability across temperature is required.
1N5259A 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):
- 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 FAQ
1.How can I place an order for 1N5259A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5259A 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 reliable?
The price and inventory of 1N5259A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5259A is usually 5 days.
3.What payment methods are accepted for 1N5259A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5259A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5259A?
1N5259A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5259A 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?
For technical support, including 1N5259A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5259A requirements.
6.How does Aetrix verify that 1N5259A is sourced from the original manufacturer or authorized distributors?
All 1N5259A 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 meets industry standards.
7.What is the process for return or replacement of 1N5259A?
All 1N5259A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5259A, 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 part is unused and in its original packaging.
Return procedure for 1N5259A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5259A Tags
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