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Diodes Incorporated 1N5266B-T
- Part No.:
- 1N5266B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5266B-T.pdf
- Description:
- DIODE ZENER 68V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,220
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Product details
Overview
1N5266B-T from Diodes Incorporated is a 68 V, ±5% tolerance, 500 mW surface-mount Zener diode in a hermetic DO-35 glass package, rated for operation from –65 °C to +175 °C, with 230 Ω dynamic impedance at 1.8 mA test current and +0.097 %/°C temperature coefficient-used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5266B-T datasheet, 1N5266B-T pinout, 1N5266B-T application, or 1N5266B-T equivalent, key selection criteria include Zener voltage stability under thermal drift, low leakage (<0.1 µA at 52 V), hermetic reliability for harsh environments, and compatibility with automated SMT assembly using Sn96.5Ag3.5 terminations.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 68 V reference across load and line variations. Its 230 Ω Zener impedance at IZT = 1.8 mA ensures minimal voltage deviation under dynamic current changes, while the +0.097 %/°C temperature coefficient enables predictable drift compensation in analog circuits.
The DO-35 glass package provides hermetic sealing and high thermal resistance (RθJA = 300 °C/W), requiring lead temperature control ≤75 °C during soldering. Polarity is marked by a cathode band, and the device complies with RoHS 3 (2015/863/EU) with Sn96.5Ag3.5 solderable terminations per MIL-STD-202 Method 208.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 68 V nominal, 64.6–71.4 V range at 1.8 mA - defines precise clamping threshold for overvoltage protection |
| Power Dissipation | 500 mW - limits continuous thermal stress in compact PCB layouts without heatsinking |
| Zener Impedance | 230 Ω at IZT = 1.8 mA - determines output voltage ripple sensitivity in regulation circuits |
| Reverse Leakage | <0.1 µA at 52 V - ensures negligible standby current in battery-powered voltage monitors |
| Temp Coefficient | +0.097 %/°C - quantifies voltage drift magnitude per degree Celsius rise in ambient |
| Operating Temp | –65 °C to +175 °C - supports deployment in automotive engine compartments and industrial motor drives |
| Package | DO-35 glass - hermetic seal prevents moisture ingress and long-term parameter shift |
Pinout & Package
DO-35 glass axial package with cathode band marking; leads are Sn96.5Ag3.5 plated, solderable per MIL-STD-202 Method 208; weight ≈ 0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common; forms reference return path in shunt regulator topologies |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to input rail via series resistor; delivers stable 68 V to feedback networks or protection comparators |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-35 package | Prevents parametric drift due to humidity exposure in outdoor or industrial enclosures |
| ±5% Zener tolerance | Enables single-bin selection without post-assembly calibration in cost-sensitive power supplies |
| RoHS 3 compliant finish | Sn96.5Ag3.5 termination ensures reliable reflow solderability and eliminates lead-based process risks |
| High-temperature rating | –65 °C to +175 °C operation supports under-hood automotive and downhole sensing applications |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 68 V threshold to TL431-like comparator inputs. Use Value: Maintains ±1.5% output accuracy over line/load/temperature with <0.1 µA leakage minimizing bias error. | Use Scenario: Supplies excitation voltage to strain gauge bridges in factory-floor pressure transducers. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric ADC front-end biasing. Use Value: +0.097 %/°C TC enables software-based drift correction within 0.5% full-scale error over –40 to +125 °C. |
| Overvoltage Clamp for CAN Bus | Programmable Threshold Detector |
Use Scenario: Protects ISO 11898-2 transceiver inputs against load-dump transients up to 70 V. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing surge energy before IC damage occurs. Use Value: 230 Ω ZZT limits clamping voltage overshoot to <72 V during 100 ns spikes, preserving signal integrity. | Use Scenario: Sets trip point for microcontroller GPIO-based undervoltage lockout in battery-backed systems. IC Role / Device Role / Timing Role: Analog threshold element feeding comparator input with known 68 V reference. Use Value: Tight 64.6–71.4 V tolerance allows deterministic reset timing without external trimming resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5266B | Surface-mount SOD-123 package; same 68 V, ±5%, but lower 350 mW rating and 250 Ω ZZT | Designed for high-density PCBs where DO-35 axial footprint is prohibitive | Select when board space is constrained and thermal derating to 350 mW is acceptable |
| BZX55C68 | DO-35 package, 68 V ±5%, but 500 mW rating with higher 300 Ω ZZT and +0.1 %/°C TC | Legacy industrial stock item with broader distributor availability but looser TC spec | Select when legacy BOM continuity is required and ±0.001 %/°C TC margin is noncritical |
Compared with MMSZ5266B and BZX55C68, the 1N5266B-T offers superior thermal stability (+0.097 %/°C vs. +0.1 %/°C) and lower Zener impedance (230 Ω vs. 250–300 Ω), making it preferable for precision reference designs where long-term drift and regulation ripple must be minimized.
Availability
1N5266B-T is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor references, overvoltage clamps, and programmable threshold detectors requiring stable component supply despite its obsolete status.
Supply support for 1N5266B-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.
The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered for high-reliability voltage regulation and transient suppression in automotive, industrial, and telecom infrastructure applications.
FAQ
Is the 1N5266B-T still in production?
No-the 1N5266B-T is officially obsolete and discontinued per Diodes Incorporated's DS18006 Rev. 19. It remains available through authorized distributors with remaining legacy stock, and Aetrix Electronics maintains traceable inventory with full lot documentation for ongoing production support.
What is the maximum reverse voltage before breakdown?
The 1N5266B-T has a nominal Zener voltage of 68 V with a guaranteed range of 64.6 V to 71.4 V at 1.8 mA test current. Breakdown begins within this band; operation above 71.4 V risks exceeding power dissipation limits unless current is strictly limited by an external series resistor.
Can it replace the 1N5266B without design changes?
Yes-the "-T" suffix denotes tape-and-reel packaging for automated assembly; electrically and mechanically identical to the bulk 1N5266B. Both share DO-35 package dimensions, Sn96.5Ag3.5 terminations, and identical electrical specs-no schematic or layout modifications are needed.
Why is the temperature coefficient positive?
Zener diodes above ~5 V exhibit avalanche-dominated breakdown, which has a positive temperature coefficient. At 68 V, the 1N5266B-T's +0.097 %/°C reflects dominant avalanche physics-unlike low-voltage Zeners (<5 V) that show negative TC due to Zener tunneling dominance.
1N5266B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5266B-T FAQ
1.How can I place an order for 1N5266B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5266B-T 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-T reliable?
The price and inventory of 1N5266B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5266B-T is usually 5 days.
3.What payment methods are accepted for 1N5266B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5266B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5266B-T?
1N5266B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5266B-T 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-T?
For technical support, including 1N5266B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5266B-T requirements.
6.How does Aetrix verify that 1N5266B-T is sourced from the original manufacturer or authorized distributors?
All 1N5266B-T 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-T meets industry standards.
7.What is the process for return or replacement of 1N5266B-T?
All 1N5266B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5266B-T, 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-T part is unused and in its original packaging.
Return procedure for 1N5266B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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