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Microchip Technology 1N5261A
- Part No.:
- 1N5261A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5261A.pdf
- Description:
- DIODE ZENER 47V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,804
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Product details
Overview
1N5261A from Microsemi is a 47 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 2.7 mA test current and 105 Ω dynamic impedance at 0.25 mA, used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5261A datasheet, 1N5261A pinout, 1N5261A application, or 1N5261A equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener voltage temperature coefficient (+0.095 %/°C), and direct alternatives with documented tolerance and impedance differences.
Technical Context
The 1N5261A operates as a two-terminal reverse-biased voltage reference with sharp breakdown knee, specified at IZT = 2.7 mA and guaranteed IR ≤ 0.1 μA at VR = 34 V. Its DO-35 glass package enables stable operation from –65°C to +175°C with 250 °C/W junction-to-lead thermal resistance.
It exhibits a positive temperature coefficient of +0.095 %/°C (measured from 25°C to 125°C at rated IZT), low capacitance (<2.5 pF typical per Figure 2), and ESD insensitivity per MIL-STD-750 Method 1020 - making it suitable for ruggedized industrial references where long-term stability matters more than ultra-low noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 47 V ±10% at 2.7 mA - defines regulated output level with predictable deviation under load and temperature variation. |
| Power Dissipation | 500 mW at 25°C ambient - sets maximum continuous power before thermal derating begins; usable up to 175°C case temperature. |
| Zener Impedance | 105 Ω at IZK = 0.25 mA - indicates voltage regulation stiffness near knee; higher than low-voltage Zeners due to bandgap physics. |
| Reverse Current | ≤0.1 μA at VR = 34 V - ensures minimal leakage in standby mode, critical for battery-powered reference circuits. |
| Temp. Coefficient | +0.095 %/°C - quantifies voltage drift over temperature; enables compensation design in precision analog systems. |
| Forward Voltage | ≤1.5 V at 200 mA - defines conduction threshold when used bidirectionally or in clamp configurations. |
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, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward conduction path when biased positively relative to cathode. |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines regulated voltage reference point at this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N52xx standard for voltage regulation, ensuring cross-manufacturer interchangeability within tolerance bands. |
| High-temperature operation | Rated for –65°C to +175°C storage and operating range - supports deployment in aerospace, downhole, and automotive under-hood environments. |
| Radiation hardness | Inherently radiation-hard per MicroNote 050 - validated for total ionizing dose (TID) resilience without shielding or special screening. |
| Low leakage performance | IR ≤ 0.1 μA at 72% of nominal Zener voltage - minimizes quiescent current draw in always-on reference designs. |
Applications
| Industrial Sensor Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 47 V bias for high-side current-sense amplifier in 48 V DC power distribution system. IC Role / Device Role / Timing Role: Voltage reference element establishing precise trip threshold for fault detection circuitry. Use Value: Enables repeatable 47 V ±10% clamping across temperature, reducing false trips caused by reference drift. |
Use Scenario: Protecting microcontroller I/O pins against transient surges on 36 V industrial bus lines. IC Role / Device Role / Timing Role: Bidirectional transient suppressor configured with series resistor to limit peak current during surge events. Use Value: Limits clamped voltage to ≤47 V with <0.1 μA leakage, preserving signal integrity during normal operation. |
| Programmable Power Supply Feedback | Analog Test Equipment Calibration |
Use Scenario: Setting output voltage in adjustable linear regulator using resistive divider tied to 1N5261A cathode. IC Role / Device Role / Timing Role: Precision shunt reference defining feedback node voltage independent of load current. Use Value: Maintains ±10% regulation accuracy over 1–10 mA operating range, supporting ±1% output voltage setting. |
Use Scenario: Calibrating 50 V full-scale range in portable multimeter reference chain. IC Role / Device Role / Timing Role: Primary voltage standard traceable to JEDEC specification, used in factory calibration procedure. Use Value: Delivers stable 47 V reference with +0.095 %/°C drift - enabling temperature-compensated calibration algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5261B | ±5% tolerance (vs. ±10% for 1N5261A); same VZ, IZT, ZZK, and thermal specs. | Higher accuracy required in closed-loop feedback or metrology-grade references. | Select 1N5261B when tighter regulation tolerance is needed without changing layout or thermal design. |
| MMBZ5261B | SOT-23 surface-mount package; same 47 V ±5%, but lower power rating (225 mW) and higher ZZT (120 Ω). | Space-constrained PCBs where axial leads are impractical; not suitable for >150 mW continuous dissipation. | Choose MMBZ5261B only if board space is critical and power dissipation remains below 150 mW average. |
Compared with 1N5261A, the 1N5261B offers improved voltage accuracy at identical thermal and electrical behavior, while MMBZ5261B trades package size and power capability for surface-mount compatibility - neither is pin-compatible, but both serve overlapping regulation roles with distinct mechanical constraints.
Availability
1N5261A is available at Aetrix Electronics and suitable for industrial sensor reference, overvoltage clamp, and programmable power supply feedback applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N5261A 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 1N52xx series was designed as a JEDEC-standardized family of general-purpose Zener diodes delivering consistent regulation performance across wide temperature and current ranges - optimized for cost-sensitive yet mission-critical voltage reference use cases.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5261A?
The 1N5261A has a nominal Zener voltage of 47 V with a tolerance of ±10%, measured at a test current of 2.7 mA. This tolerance reflects the guaranteed spread across production lots and is defined per JEDEC standard for suffix "A" devices. The 1N5261A is not rated for tighter tolerances - for ±5%, the 1N5261B variant must be selected instead.
What is the maximum power dissipation and thermal derating behavior of the 1N5261A?
The 1N5261A is rated for 500 mW power dissipation at 25°C ambient, with linear derating above 50°C lead temperature (TL) or 25°C ambient (TA) depending on mounting method. Derating follows 250 °C/W junction-to-lead resistance for 3/8″ lead length, reaching zero dissipation at 175°C case temperature. Full derating curve is shown in Figure 1 of the official datasheet.
Does the 1N5261A have a specified Zener impedance, and at what conditions is it measured?
Yes, the 1N5261A has a maximum Zener impedance (ZZK) of 105 Ω, measured at IZK = 0.25 mA. This value reflects dynamic impedance near the knee of the breakdown curve and is derived from 60 Hz AC superimposed on DC bias - ensuring stable regulation onset. ZZT at IZT = 2.7 mA is not specified for this part in the datasheet.
What is the temperature coefficient of the 1N5261A, and how is it tested?
The 1N5261A has a temperature coefficient (αVZ) of +0.095 %/°C, measured between 25°C and 125°C at its rated test current (2.7 mA). Per Note 3 in the datasheet, the device is thermally stabilized with current applied prior to voltage measurement at each temperature point - confirming predictable positive drift essential for compensated reference designs.
Is the 1N5261A RoHS compliant, and how is compliance indicated?
Yes, RoHS-compliant versions of the 1N5261A are available with the "e3" suffix (e.g., 1N5261Ae3), indicating annealed matte-tin plating per RoHS Directive 2011/65/EU. Standard 1N5261A units use tin-lead plating unless otherwise specified; the "e3" designation must appear in the full orderable part number to guarantee compliance.
1N5261A 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):
- 47 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 105 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 36 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)
1N5261A FAQ
1.How can I place an order for 1N5261A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5261A 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 1N5261A reliable?
The price and inventory of 1N5261A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5261A is usually 5 days.
3.What payment methods are accepted for 1N5261A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5261A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5261A?
1N5261A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5261A 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 1N5261A?
For technical support, including 1N5261A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5261A requirements.
6.How does Aetrix verify that 1N5261A is sourced from the original manufacturer or authorized distributors?
All 1N5261A 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 1N5261A meets industry standards.
7.What is the process for return or replacement of 1N5261A?
All 1N5261A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5261A, 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 1N5261A part is unused and in its original packaging.
Return procedure for 1N5261A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5261A Tags
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MM5Z5V1ST1G
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