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Microchip Technology 1N5268B
- Part No.:
- 1N5268B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5268B.pdf
- Description:
- DIODE ZENER 82V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,335
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Product details
Overview
1N5268B from Microsemi is a 500 mW, 82 V, ±5% tolerance 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 82 V Zener voltage at 1.5 mA test current with 2000 Ω dynamic impedance and operates across –65°C to +175°C.
For engineers reviewing the 1N5268B datasheet, 1N5268B pinout, 1N5268B application, or 1N5268B equivalent, key selection criteria include its 82 V nominal Zener voltage, ±5% tolerance (B suffix), 2000 Ω Zener impedance at IZK = 0.25 mA, temperature coefficient of +0.098 %/°C, and DO-35 hermetic glass package suitability for high-reliability industrial and aerospace environments.
Technical Context
The 1N5268B operates as a two-terminal reverse-biased voltage reference, maintaining regulation across 1.5 mA to 105 mA operating current range with minimal capacitance (<2 pF typical per Figure 2). Its Zener knee is sharp and stable, verified by dual-point impedance measurement per MicroNote 202.
Designed for high-temperature reliability, it features 250 °C/W junction-to-lead thermal resistance at 3/8″ lead length and is inherently radiation-hardened per MicroNote 050. The cathode band marking ensures unambiguous polarity during PCB placement and functional biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 82 V at IZT = 1.5 mA - defines precise regulation point for reference and clamp circuits |
| Zener Tolerance | ±5% (B suffix) - guarantees voltage accuracy within ±4.1 V at 25°C for production consistency |
| Zener Impedance | 2000 Ω at IZK = 0.25 mA - indicates moderate dynamic resistance affecting regulation stability under light load |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous power handling before thermal derating applies |
| Temperature Coefficient | +0.098 %/°C - quantifies positive drift rate; output rises ~80 mV/°C near 82 V over operating range |
| Operating Temperature | –65°C to +175°C - enables deployment in extended-environment automotive, downhole, and military systems |
| Forward Voltage | ≤1.5 V at 200 mA - ensures predictable forward conduction behavior during transient reversal or testing |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by single black 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 (unbanded end) | Reference ground node in Zener regulator configuration | Connected to circuit common; reverse bias applied between cathode and this terminal |
| Cathode (banded end) | Zener voltage output node | Provides regulated 82 V when reverse biased; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Guarantees full six-parameter specification compliance (VZ, IR, ZZT, ZZK, αVZ, VF) per JEDEC standard |
| Inherent radiation hardness | Validated per MicroNote 050 - suitable for space-qualified and nuclear instrumentation applications without additional shielding |
| ESD insensitivity | Passes MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
| Minimal junction capacitance | <2 pF typical (Figure 2) - preserves high-frequency signal integrity in RF bias and timing circuits |
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift - supports >20-year shelf life and field reliability |
Applications
| Industrial Power Supply Reference | Aerospace Voltage Clamp |
|---|---|
Use Scenario: Stable 82 V reference for feedback loop in isolated DC-DC converter secondary side. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing error amplifier setpoint. Use Value: ±5% tolerance and +0.098 %/°C TC enable <±1.2 V total drift over –40°C to +85°C ambient, meeting MIL-STD-704A line regulation requirements. |
Use Scenario: Overvoltage protection on 70 V avionics bus against load dump transients. IC Role / Device Role / Timing Role: Shunt clamping element diverting excess energy to ground above 82 V threshold. Use Value: 500 mW rating and –65°C to +175°C operation ensure reliable clamping during extreme thermal cycling and vibration conditions. |
| Test Equipment Calibration Standard | Downhole Sensor Bias Supply |
Use Scenario: Precision voltage source in handheld multimeter internal reference divider. IC Role / Device Role / Timing Role: Primary Zener reference establishing 100 mV/div scaling accuracy. Use Value: Low 2000 Ω Zener impedance minimizes loading error on high-impedance divider networks, preserving measurement linearity. |
Use Scenario: Bias supply for piezoresistive pressure transducers in oil/gas well logging tools. IC Role / Device Role / Timing Role: High-temperature-stable voltage source powering sensor bridge excitation. Use Value: Radiation hardness and 175°C max operating temperature allow uninterrupted operation at 150°C downhole ambient with <0.5% VZ shift over 10,000 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5268C | Same 82 V nominal voltage but ±2% tolerance (C suffix); higher cost; tighter TC not specified | Better initial accuracy required for metrology-grade references where calibration drift budget is sub-0.1% | Select 1N5268C only if ±2% tolerance is mandated and TC stability is secondary to absolute voltage accuracy |
| MMBZ5268B | Surface-mount MELF (DO-213AA) package; same 82 V/±5%/500 mW specs; lower thermal resistance (220 °C/W) | Preferred for automated SMT assembly and space-constrained PCBs where axial leads are incompatible | Choose MMBZ5268B for volume production with pick-and-place lines; retain 1N5268B for through-hole prototyping or high-vibration mounting |
Compared with 1N5268C and MMBZ5268B, the 1N5268B offers optimal balance of legacy compatibility, axial-lead mechanical robustness, and cost-effective ±5% accuracy-making it ideal for repair, military depot maintenance, and designs requiring JEDEC-standard through-hole Zeners with proven field history.
Availability
1N5268B is available at Aetrix Electronics and suitable for industrial power supply reference, aerospace voltage clamp, and test equipment calibration applications requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5268B 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, mixed-signal, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N52xxB series was engineered to meet MIL-PRF-19500 screening requirements and deliver JEDEC-guaranteed Zener performance in hermetic glass packages for mission-critical voltage reference and protection functions.
FAQ
What is the Zener voltage tolerance of the 1N5268B?
The 1N5268B has a nominal Zener voltage of 82 V with a guaranteed tolerance of ±5%, as designated by the "B" suffix per JEDEC standard. This means the actual measured VZ at 1.5 mA test current falls between 77.9 V and 86.1 V at 25°C, and is validated across the full –65°C to +175°C operating range per Microsemi's characterization data.
Does the 1N5268B require heatsinking in standard PCB layouts?
No, the 1N5268B does not require external heatsinking under typical operating conditions. With a thermal resistance of 310 °C/W junction-to-ambient on FR4 board (1 oz Cu, 4 mm² pads), it dissipates up to 500 mW at 25°C ambient. Derating begins above 50°C lead temperature or 25°C board temperature-full power is usable only with adequate copper area and airflow.
How is polarity identified on the 1N5268B?
The 1N5268B uses a single black cathode band on the glass body to indicate polarity. The banded end is the cathode and must be held positive relative to the unbanded (anode) end for proper Zener regulation. This marking complies with JEDEC DO-35 standards and is visible under standard optical inspection during manual or automated assembly.
Is the 1N5268B suitable for high-reliability aerospace applications?
Yes-the 1N5268B is qualified for aerospace use via optional MIL-PRF-19500 screening (e.g., JANTXV grade with MV prefix). Its hermetic DO-35 glass package, radiation hardness per MicroNote 050, –65°C to +175°C operation, and JEDEC-registered six-parameter specification make it suitable for flight-critical voltage references and clamps in satellite power systems and avionics.
What is the maximum reverse leakage current for the 1N5268B?
The 1N5268B specifies a maximum reverse leakage current (IR) of 10 μA at VR = 66 V, per the electrical characteristics table. This value is measured after 20-second stabilization at 25°C with 3/8″ lead length and reflects worst-case leakage under rated non-breakdown conditions-critical for low-power standby circuits and battery-operated systems.
1N5268B 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):
- 82 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 330 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 62 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)
1N5268B FAQ
1.How can I place an order for 1N5268B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5268B 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 1N5268B reliable?
The price and inventory of 1N5268B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5268B is usually 5 days.
3.What payment methods are accepted for 1N5268B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5268B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5268B?
1N5268B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5268B 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 1N5268B?
For technical support, including 1N5268B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5268B requirements.
6.How does Aetrix verify that 1N5268B is sourced from the original manufacturer or authorized distributors?
All 1N5268B 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 1N5268B meets industry standards.
7.What is the process for return or replacement of 1N5268B?
All 1N5268B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5268B, 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 1N5268B part is unused and in its original packaging.
Return procedure for 1N5268B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5268B 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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