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Microchip Technology 1N5266B
- Part No.:
- 1N5266B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5266B.pdf
- Description:
- DIODE ZENER 68V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,807
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Product details
Overview
1N5266B from Microsemi is a 500 mW, 68 V ±5% glass axial-lead Zener diode in DO-35 (DO-204AH) package, designed for precision voltage regulation in low-power analog circuits, reference supplies, and overvoltage protection. It delivers stable regulation at 20 mA test current with 230 Ω dynamic impedance and operates across –65°C to +175°C.
For engineers reviewing the 1N5266B datasheet, 1N5266B pinout, 1N5266B application, or 1N5266B equivalent, key selection criteria include its ±5% tolerance (B suffix), low temperature coefficient (+0.097 %/°C), 0.1 μA max reverse leakage at 54.4 V, and compatibility with manual or wave soldering per MIL-STD-750.
Technical Context
This Zener diode operates in reverse breakdown mode with cathode band indicating polarity. Its regulation performance is specified at 20 mA test current (IZT), with dynamic impedance measured at both IZT and 0.25 mA (IZK) to ensure sharp knee characteristics and unit stability.
The device uses hermetically sealed glass construction for high reliability and radiation hardness, features tin-lead or RoHS-compliant matte-tin plating, and exhibits minimal capacitance-typically under 4 pF-as confirmed by Figure 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 68 V ±5% at 20 mA - defines precise regulation point for reference and clamp circuits |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance | 230 Ω at IZT - determines output voltage variation under load current changes |
| Reverse Leakage | 0.1 μA max at 54.4 V - ensures low standby current in high-impedance bias networks |
| Temp. Coefficient | +0.097 %/°C - quantifies voltage drift over temperature for stability-critical references |
| Operating Temp. | –65°C to +175°C - supports deployment in aerospace, downhole, and industrial environments |
| Forward Voltage | 1.5 V max at 200 mA - defines conduction threshold when used in forward-biased protection paths |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by a single band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Mechanical mounting uses flexible axial leads with 0.2 g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded lead | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Banded lead | 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 1N52xxB standard for guaranteed VZ, IR, VF, ZZT, ZZK, and αVZ parameters |
| ±5% voltage tolerance | Ensures predictable regulation without post-manufacture sorting or trimming in production |
| Radiation-hardened design | Inherently radiation tolerant per MicroNote 050 - suitable for space-qualified and high-reliability systems |
| ESD-insensitive | Rated per MIL-STD-750 Method 1020 - eliminates need for ESD handling controls during assembly |
| Low capacitance | Typical <4 pF - preserves signal integrity in RF-coupled or high-frequency bias applications |
Applications
| Reference Voltage Source | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 68 V reference for ADC voltage scaling or op-amp feedback networks in industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to deliver fixed reference voltage independent of supply variation. Use Value: Enables accurate 12-bit+ measurement resolution with <±0.34 V total drift over –40°C to +85°C ambient. | Use Scenario: Protecting input stages of instrumentation amplifiers from transient surges exceeding 68 V. IC Role / Device Role / Timing Role: Shunt clamping element that conducts excess energy to ground when input exceeds 68 V. Use Value: Limits peak voltage to 68 V ±5% with sub-100 ns response, preventing damage to downstream CMOS inputs. |
| Power Supply Regulation | Temperature-Stable Bias Network |
Use Scenario: Regulating auxiliary 68 V rail in isolated DC-DC converter feedback loops. IC Role / Device Role / Timing Role: Voltage reference for optocoupler-based feedback in flyback or forward converters. Use Value: Maintains ±1.5% output regulation over full line/load/temperature range due to low αVZ and tight tolerance. | Use Scenario: Setting bias points for high-temperature JFET amplifier stages in oil & gas downhole tools. IC Role / Device Role / Timing Role: Precision voltage source defining gate-source offset in analog front-end circuits. Use Value: Delivers <±0.7% voltage error from –65°C to +175°C, enabling stable gain and offset calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | 68 V ±5%, 1 W power rating, DO-41 package, higher thermal resistance (100°C/W junction-to-ambient) | Suitable for higher-power dissipation but requires larger PCB footprint and heatsinking | Select when >500 mW continuous power is needed; not drop-in due to DO-41 vs. DO-35 mechanical mismatch |
| MMBZ5266B | 68 V ±5%, 225 mW SOT-23 package, surface-mount, higher ZZT (300 Ω), same tempco | Used in space-constrained PCBs where axial leads are impractical | Select for automated assembly and compact layouts; requires rework of pad layout and thermal design |
Compared with 1N4745A and MMBZ5266B, the 1N5266B offers optimal balance of hermetic reliability, low-temperature drift, and axial-lead serviceability for through-hole prototyping and high-temperature industrial use-without requiring board redesign or derating for power.
Availability
1N5266B is available at Aetrix Electronics and suitable for precision reference generation, overvoltage protection, power supply regulation, and high-temperature bias networks requiring stable component supply and long-term traceability.
Supply support for 1N5266B 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 1N52xxB series was engineered for mission-critical voltage reference and protection roles where parameter stability, wide temperature operation, and hermetic packaging are mandatory-not just general-purpose regulation.
FAQ
What is the Zener voltage tolerance for 1N5266B?
The 1N5266B has a nominal Zener voltage of 68 V with a guaranteed tolerance of ±5%, as designated by the "B" suffix per JEDEC specification. This tolerance is verified at 20 mA test current and 25°C ambient, and applies across the full operating temperature range of –65°C to +175°C.
Does 1N5266B require special handling for ESD sensitivity?
No, the 1N5266B is nonsensitive to ESD and rated per MIL-STD-750 Method 1020. It does not require ESD-safe packaging, wrist straps, or controlled environment handling during assembly or testing-unlike many modern silicon devices.
What is the maximum reverse leakage current for 1N5266B and at what voltage is it specified?
The 1N5266B has a maximum reverse leakage current of 0.1 μA, specified at a reverse voltage of 54.4 V (80% of nominal 68 V). This value is guaranteed across the full temperature range and confirms low standby power in high-impedance reference networks.
Can 1N5266B be used in surface-mount designs?
No-the 1N5266B is a through-hole DO-35 axial-leaded device. For surface-mount equivalents, Microsemi offers the MLL5266B in DO-213AA (MELF) package; it shares identical electrical specs but requires different PCB land patterns and reflow profiles.
What is the thermal resistance of 1N5266B when mounted on a standard FR4 PCB?
When mounted on FR4 with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm traces, the 1N5266B has a thermal resistance of 310°C/W junction-to-ambient. At 25°C ambient, this limits steady-state power to 0.48 W-below its 0.5 W rating at 25°C lead temperature.
1N5266B 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:
- ±5%
- 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)
1N5266B FAQ
1.How can I place an order for 1N5266B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5266B 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 1N5266B reliable?
The price and inventory of 1N5266B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5266B is usually 5 days.
3.What payment methods are accepted for 1N5266B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5266B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5266B?
1N5266B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5266B 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 1N5266B?
For technical support, including 1N5266B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5266B requirements.
6.How does Aetrix verify that 1N5266B is sourced from the original manufacturer or authorized distributors?
All 1N5266B 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 1N5266B meets industry standards.
7.What is the process for return or replacement of 1N5266B?
All 1N5266B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5266B, 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 1N5266B part is unused and in its original packaging.
Return procedure for 1N5266B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5266B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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