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Microchip Technology 1N5266A
- Part No.:
- 1N5266A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5266A.pdf
- Description:
- DIODE ZENER 68V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,281
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Product details
Overview
1N5266A from Microsemi is a 500 mW glass axial-lead Zener diode with nominal Zener voltage of 68 V, ±10% tolerance (A suffix), 1.8 mA test current, and 230 Ω maximum Zener impedance at IZK = 0.25 mA. It operates across –65 °C to +175 °C and regulates voltage in low-power reference and protection circuits.
For engineers reviewing the 1N5266A datasheet, 1N5266A pinout, 1N5266A application, or 1N5266A equivalent, this part serves as a stable, temperature-compensated voltage reference in analog power supplies, overvoltage clamping networks, and precision biasing where DO-35 axial-leaded packaging and JEDEC-standard compliance are required.
Technical Context
The 1N5266A functions as a reverse-biased voltage regulator with sharp breakdown knee verified by dual-point Zener impedance measurement per MicroNote 202. Its thermal resistance is 250 °C/W junction-to-lead at 3/8″ lead length, enabling reliable operation up to 175 °C ambient when mounted with adequate lead heat sinking.
It exhibits a positive temperature coefficient of +0.097 %/°C (measured from 25 °C to 125 °C at rated IZT), confirming predictable voltage drift under thermal stress. The device uses hermetically sealed DO-35 (DO-204AH) glass package with tin-lead or RoHS-compliant matte-tin plating, cathode indicated by band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 68 V ±10% - defines regulation setpoint for clamp/reference circuits at 1.8 mA test current |
| Power Dissipation | 0.5 W at 25 °C - limits continuous DC power handling; derates linearly above 50 °C lead temperature |
| Zener Impedance | 230 Ω max @ IZK = 0.25 mA - ensures stable regulation under light-load or dynamic transient conditions |
| Reverse Current | 0.1 μA max @ VR = 54.4 V - guarantees low leakage in high-impedance bias networks |
| Temp. Coefficient | +0.097 %/°C - quantifies predictable upward voltage drift with temperature, critical for thermal compensation design |
| Forward Voltage | 1.5 V max @ 200 mA - defines conduction threshold in forward-bias protection or logic-level detection |
| Operating Temp. | –65 °C to +175 °C - supports aerospace, downhole, and industrial environments without derating penalties |
Pinout & Package
Hermetically sealed DO-35 (DO-204AH) glass axial-leaded package with cathode identified by color band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Polarity: banded end is cathode; operated with cathode positive relative to anode for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common or lower-potential rail; carries reverse leakage and Zener current return path |
| Cathode | Zener regulation output | Banded terminal; held at stable 68 V relative to anode during reverse breakdown; used for voltage clamping or biasing |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Guarantees compliance with 1N52xx standard for interchangeability and test methodology across manufacturers |
| Low capacitance | Typical <2 pF (per Figure 2) - minimizes signal coupling and phase shift in RF or high-speed analog circuits |
| Radiation hardness | Inherently radiation-hard per MicroNote 050 - suitable for space-grade and nuclear instrumentation applications |
| ESD insensitivity | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
| Tight thermal resistance control | 250 °C/W junction-to-lead - enables accurate thermal modeling and predictable derating in lead-mounted layouts |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp for Sensor Inputs |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter error amplifiers. IC Role / Device Role / Timing Role: Zener reference providing fixed 68 V reference to optocoupler input or TL431 comparator. Use Value: Maintains ±10% regulation accuracy over –40 °C to +85 °C ambient, ensuring consistent loop gain and output stability. |
Use Scenario: Protecting 12-bit ADC inputs from transients exceeding 75 V in factory automation I/O modules. IC Role / Device Role / Timing Role: Clamping element shunting excess energy to ground when input exceeds 68 V. Use Value: Limits peak voltage to safe level with <0.1 μA leakage at 54.4 V, preserving signal integrity during normal operation. |
| High-Temperature Downhole Instrumentation | Legacy Aerospace Voltage Monitor |
Use Scenario: Biasing amplifier stages in borehole logging tools operating at 150 °C ambient. IC Role / Device Role / Timing Role: Temperature-stable reference source compensating for op-amp offset drift. Use Value: Delivers predictable +0.097 %/°C drift and survives 175 °C storage, eliminating recalibration cycles in sealed housings. |
Use Scenario: Monitoring bus voltage in MIL-PRF-19500 qualified avionics subsystems. IC Role / Device Role / Timing Role: Regulation element in JANTXV-screened power monitor circuit. Use Value: Qualified for JAN/JANTXV screening with MQ/MV prefixes; provides traceable 68 V reference compliant with legacy flight hardware specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5266B | ±5% tolerance (vs. ±10% for 1N5266A); identical VZ, IZT, ZZT, and thermal specs | Used where tighter regulation accuracy is required without changing layout or thermal design | Select 1N5266B when system-level voltage tolerance budgets demand <±5% deviation at 68 V |
| MMBZ5266B (SOT-23) | Surface-mount MELF-equivalent; same 68 V ±5%, but 225 mW rating and different thermal path (junction-to-air) | Preferred for automated PCB assembly and space-constrained designs; not drop-in due to package and power difference | Choose MMBZ5266B only when reworking for SMT compatibility and accepting 45% lower power dissipation |
Compared with 1N5266A, the 1N5266B offers improved voltage accuracy without layout or thermal impact, while MMBZ5266B enables miniaturization at the cost of power rating and requires board redesign-neither is pin-compatible due to axial vs. surface-mount form factor.
Availability
1N5266A is available at Aetrix Electronics and suitable for industrial power supplies, sensor protection circuits, and high-temperature instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5266A 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-temperature analog components for aerospace, defense, and industrial markets.
The 1N52xx series was designed specifically for robust, JEDEC-standard Zener regulation in mission-critical systems where extended temperature range, hermetic sealing, and proven field reliability are mandatory.
FAQ
What is the Zener voltage tolerance for 1N5266A?
The 1N5266A has a nominal Zener voltage of 68 V with a guaranteed tolerance of ±10%, as indicated by the "A" suffix per Microsemi's documentation. This tolerance applies under standard test conditions (IZT = 1.8 mA, TA = 25 °C) and is validated across the full operating temperature range.
Can 1N5266A be used in surface-mount designs?
No - the 1N5266A is packaged exclusively in the axial-leaded DO-35 (DO-204AH) glass case and is not compatible with SMT assembly. For surface-mount equivalents, Microsemi offers the MLL5266B in DO-213AA (MELF) package, which shares the same electrical specifications but requires PCB footprint redesign.
What is the maximum reverse leakage current for 1N5266A?
The maximum reverse leakage current (IR) for 1N5266A is 0.1 μA when tested at VR = 54.4 V (80% of nominal VZ). This value is specified in the Electrical Characteristics table on page 1 of the Microsemi datasheet and reflects performance at 25 °C.
Is 1N5266A suitable for high-temperature environments?
Yes - the 1N5266A is rated for operation from –65 °C to +175 °C and features a hermetically sealed DO-35 glass package. Its thermal resistance (250 °C/W junction-to-lead) and inherent radiation hardness make it suitable for downhole, aerospace, and industrial high-temp applications.
Does 1N5266A require external ESD protection?
No - the 1N5266A is nonsensitive to ESD per MIL-STD-750 Method 1020 and does not require additional ESD protection circuitry. This simplifies design in environments where handling or system-level transients could otherwise damage unprotected semiconductor junctions.
1N5266A 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):
- 68 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 230 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 52 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)
1N5266A FAQ
1.How can I place an order for 1N5266A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5266A 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 1N5266A reliable?
The price and inventory of 1N5266A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5266A is usually 5 days.
3.What payment methods are accepted for 1N5266A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5266A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5266A?
1N5266A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5266A 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 1N5266A?
For technical support, including 1N5266A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5266A requirements.
6.How does Aetrix verify that 1N5266A is sourced from the original manufacturer or authorized distributors?
All 1N5266A 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 1N5266A meets industry standards.
7.What is the process for return or replacement of 1N5266A?
All 1N5266A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5266A, 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 1N5266A part is unused and in its original packaging.
Return procedure for 1N5266A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5266A Tags
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