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Microchip Technology 1N5266B/TR
- Part No.:
- 1N5266B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5266B/TR.pdf
- Description:
- DIODE ZENER 68V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,270
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Product details
Overview
1N5266B/TR from Microsemi is a 500 mW, 68 V ±5% glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for -65°C to +175°C operation, with 1.8 mA test current, 230 Ω dynamic impedance at IZK, and cathode band polarity marking. It regulates voltage in low-power reference and protection circuits across industrial control and power supply feedback paths.
For engineers reviewing the 1N5266B/TR datasheet, 1N5266B/TR pinout, 1N5266B/TR application, or 1N5266B/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (250 °C/W junction-to-lead), reverse leakage (<0.1 μA at 54.4 V), temperature coefficient (+0.097 %/°C), and RoHS-compliant "e3" availability with "TR" tape-and-reel packaging.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable DC voltage under varying load and temperature conditions. Its DO-35 glass package provides hermetic sealing and inherent radiation hardness per MicroNote 050, with minimal capacitance (<2 pF typical) and ESD insensitivity per MIL-STD-750 Method 1020.
The device uses a silicon PN junction optimized for sharp knee characteristics, verified by dual-point Zener impedance measurement at IZT and IZK. Temperature coefficient is measured at IZT = 1.8 mA between 25°C and 125°C, ensuring predictable drift behavior in precision biasing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 68 V ±5% at 1.8 mA - defines regulated output level with tight tolerance for stable reference generation |
| Power Dissipation | 0.5 W at 25°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance | 230 Ω at IZK = 0.25 mA - indicates voltage regulation stiffness under light-load conditions |
| Reverse Leakage | <0.1 μA at 54.4 V - ensures minimal standby current in high-impedance bias networks |
| Temp. Coefficient | +0.097 %/°C - quantifies voltage drift magnitude over operating temperature range |
| Operating Temp. | -65°C to +175°C - supports deployment in harsh environments including aerospace and downhole systems |
| Forward Voltage | ≤1.5 V at 200 mA - defines conduction threshold when used as clamp or protection element |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-lead package with tin-lead or RoHS-compliant matte-tin plating; cathode identified by single black band; leads suitable for through-hole mounting and manual soldering at 260°C for 10 s max.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; forward conduction path when biased positively |
| Cathode | Banded end | Connected to higher-potential node during regulation; defines Zener breakdown polarity and voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 construction | Ensures mechanical and electrical interchangeability across qualified suppliers and legacy designs |
| ±5% voltage tolerance (B suffix) | Reduces calibration overhead in mid-precision voltage references versus ±10% (A) or ±20% (no suffix) |
| Inherent radiation hardness | Enables use in space-qualified and nuclear instrumentation without additional shielding or qualification |
| Nonsensitive to ESD (MIL-STD-750) | Eliminates need for on-board ESD protection circuitry in low-energy signal conditioning stages |
| Tape-and-reel packaging (TR suffix) | Supports automated SMT placement of through-hole components via pick-and-place feeders |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Provides stable 68 V reference for rail-to-rail op-amp input biasing in high-side current sensing circuits. IC Role / Device Role: Zener diode acts as two-terminal shunt reference, absorbing excess current to hold node voltage constant. Use Value: Enables accurate offset trimming and common-mode rejection in 75 V industrial sensor front-ends without active regulation. | Use Scenario: Limits transient voltage spikes on 4–20 mA loop-powered sensor outputs exposed to EMI or lightning-induced surges. IC Role / Device Role: Shunt clamping element that conducts above 68 V to protect downstream ADC inputs. Use Value: Prevents latch-up or damage to 12-bit SAR ADCs with 70 V absolute maximum rating using only passive components. |
| Feedback Divider Stabilization in SMPS | Temperature-Stable Bias Network |
Use Scenario: Stabilizes optocoupler feedback divider in isolated flyback converters operating up to 150°C ambient. IC Role / Device Role: Zener diode maintains fixed voltage across upper resistor to improve loop stability under thermal stress. Use Value: Reduces output voltage drift from ±3% to ±0.8% over full temperature range compared to resistor-only dividers. | Use Scenario: Sets base bias for high-temperature PNP transistor amplifiers in oil & gas downhole telemetry modules. IC Role / Device Role: Precision shunt reference compensating for transistor VBE drift via matched tempco (+0.097 %/°C). Use Value: Maintains amplifier gain within ±1.2% from -55°C to +175°C without trim potentiometers or compensation networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V, ±5%, 1 W DO-41 package; 20 mA test current; 22 Ω ZZT; -65°C to +175°C | Lower voltage, higher power, different thermal resistance (225 °C/W junction-to-lead) | Select when 12 V regulation with higher surge capability is required and board layout allows DO-41 footprint |
| BZX55C68 | 68 V, ±5%, 500 mW DO-35; 5 mA test current; 150 Ω ZZT; -65°C to +175°C; RoHS-only | Same voltage and package but lower ZZT, tighter production consistency, no military screening options | Choose for cost-sensitive commercial designs where MIL-PRF-19500 screening is unnecessary and lower dynamic impedance is preferred |
Compared with 1N5266B/TR, 1N4742A offers higher power and lower impedance but at 12 V and larger DO-41 package, while BZX55C68 matches voltage and form factor with improved ZZT but omits military-grade screening and internal bond options.
Availability
1N5266B/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace sensor interfaces, and downhole telemetry systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N5266B/TR 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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N52xxB series was designed for ruggedized voltage regulation in mission-critical systems where extended temperature operation, radiation tolerance, and JEDEC-standard interchangeability are mandatory.
FAQ
What is the Zener voltage tolerance for 1N5266B/TR?
The 1N5266B/TR has a nominal Zener voltage of 68 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per JEDEC specification. This tolerance is verified at 1.8 mA test current and 25°C ambient, and applies across the full operating temperature range of -65°C to +175°C per Microsemi's characterization data.
Does 1N5266B/TR support military-grade screening?
Yes, the 1N5266B/TR can be ordered with military screening per MIL-PRF-19500 by adding appropriate prefixes: MQ (JAN), MX (JANTX), MV (JANTXV), or MSP (JANS), provided the part number also includes the "-1" internal bond suffix. Standard 1N5266B/TR is commercial-grade but shares the same DO-35 package and baseline electrical specs.
What is the thermal resistance of 1N5266B/TR?
The 1N5266B/TR has a thermal resistance of 250 °C/W junction-to-lead at 3/8 inch (10 mm) lead length from the glass body. When mounted on an FR4 PCB with 1 oz copper, 4 mm² pads, and specified trace geometry, its junction-to-ambient thermal resistance is 310 °C/W, defining derating curves per Figure 1 in the Microsemi datasheet.
Is 1N5266B/TR RoHS compliant?
Yes, 1N5266B/TR is available in RoHS-compliant configuration with annealed matte-tin plating, designated by the "e3" suffix (e.g., 1N5266B-e3/TR). The standard version uses tin-lead plating, and both meet MIL-STD-750 Method 2026 solderability requirements.
What is the maximum reverse leakage current for 1N5266B/TR?
The maximum reverse leakage current for 1N5266B/TR is 0.1 μA at 54.4 V (80% of nominal Zener voltage), measured at 25°C. This value remains stable across the full operating temperature range due to the device's low temperature coefficient and hermetic glass package.
1N5266B/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- 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/TR FAQ
1.How can I place an order for 1N5266B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5266B/TR 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/TR reliable?
The price and inventory of 1N5266B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5266B/TR is usually 5 days.
3.What payment methods are accepted for 1N5266B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5266B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5266B/TR?
1N5266B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5266B/TR 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/TR?
For technical support, including 1N5266B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5266B/TR requirements.
6.How does Aetrix verify that 1N5266B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5266B/TR 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/TR meets industry standards.
7.What is the process for return or replacement of 1N5266B/TR?
All 1N5266B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5266B/TR, 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/TR part is unused and in its original packaging.
Return procedure for 1N5266B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5266B/TR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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