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Diodes Incorporated 1N5267B-T
- Part No.:
- 1N5267B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5267B-T.pdf
- Description:
- DIODE ZENER 75V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,749
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Product details
Overview
1N5267B-T from Diodes Incorporated is a 75V ±5% tolerance, 500mW hermetic glass-encapsulated Zener diode in DO-35 package, rated for 1.7mA test current and 270Ω dynamic impedance at 1.7mA, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N5267B-T datasheet, 1N5267B-T pinout, 1N5267B-T application, or 1N5267B-T equivalent, key selection criteria include Zener voltage stability over temperature (±0.098%/°C), low leakage (<0.1µA at 60V), hermetic glass packaging for long-term reliability, and RoHS-compliant Sn96.5Ag3.5 terminations.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable 75V regulation under controlled current conditions. Its 300°C/W junction-to-ambient thermal resistance requires lead length control (≤9.5mm) and ambient derating above 75°C to sustain full 500mW dissipation.
The device exhibits a positive temperature coefficient of +0.098%/°C and maximum 1700Ω knee impedance at 0.25mA, supporting accurate low-current reference generation. Its cathode band polarity and DO-35 mechanical outline ensure compatibility with legacy through-hole PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 75V nominal, 71.25–78.75V range at 1.7mA - defines precise clamping threshold for protection or reference |
| Power Dissipation | 500mW - sets maximum continuous reverse power handling before thermal runaway |
| Zener Impedance | 270Ω at 1.7mA - determines regulation accuracy under load variation |
| Reverse Leakage | <0.1µA at 60V - ensures minimal standby current in high-impedance bias networks |
| Temp Coefficient | +0.098%/°C - quantifies voltage drift per degree Celsius for thermal design margining |
| Package | DO-35 glass case - provides hermetic sealing and proven reliability in industrial environments |
| RoHS Status | Lead-free, Sn96.5Ag3.5 finish - meets EU Directive 2015/863/EU without exemptions |
Pinout & Package
DO-35 axial glass package with cathode band marking; leads are solderable per MIL-STD-202 Method 208, weight ≈0.13g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side during normal operation; enables forward bias testing |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher potential side to achieve 75V reverse regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Encapsulation | Prevents moisture ingress and long-term parameter drift in humid or harsh environments |
| ±5% Zener Tolerance | Enables use in applications requiring tighter initial voltage accuracy without post-production trimming |
| Low Temperature Drift | +0.098%/°C allows predictable compensation in temperature-stable reference designs |
| High Stability Over Life | Validated for operation from –65°C to +175°C junction temperature with no parameter shift beyond spec |
Applications
| Voltage Reference for Analog Sensors | Overvoltage Clamp in Power Supply Rails |
|---|---|
Use Scenario: Providing stable excitation voltage to precision RTD or strain gauge bridges in industrial transmitters. IC Role / Device Role / Timing Role: Zener diode acting as two-terminal shunt reference, replacing bulkier IC references where space and cost are constrained. Use Value: Delivers 75V reference with <0.1µA leakage, minimizing bridge current error and enabling high-resolution ADC measurements. | Use Scenario: Protecting 60V-rated op-amps and ADC inputs from transient surges on factory automation I/O lines. IC Role / Device Role / Timing Role: Passive shunt clamp limiting rail voltage to 78.75V peak during ESD or inductive kick events. Use Value: Absorbs up to 500mW surge energy without degradation, maintaining system uptime where active protection adds latency. |
| Calibration Standard in Portable Test Equipment | Bias Network Stabilizer in RF Front-Ends |
Use Scenario: Serving as traceable voltage standard in handheld multimeters and calibration checkers requiring field-replaceable references. IC Role / Device Role / Timing Role: Primary shunt reference element in self-calibrating voltage divider networks. Use Value: Hermetic DO-35 construction ensures calibration retention over 10+ years without drift exceeding ±0.5%. | Use Scenario: Setting fixed gate bias for GaAs FETs in 5G small-cell PA modules operating at elevated ambient temperatures. IC Role / Device Role / Timing Role: Temperature-compensated DC bias source stabilizing quiescent current across –40°C to +85°C. Use Value: +0.098%/°C TC matches FET VGS drift, reducing gain variation to <1.2dB over full temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5267B | Surface-mount SOD-123 package; same 75V rating but 350mW rating and 300Ω ZZT | Designed for automated assembly; lacks hermetic seal and higher temp rating (–65°C to +150°C) | Select when board space and reflow compatibility outweigh long-term stability requirements |
| 1N4744A | 14V Zener, 1W power rating, DO-41 package; different voltage and thermal profile | Used in higher-power regulator feedback paths, not direct 75V replacement | Choose only for redesigns where voltage scaling and increased dissipation are acceptable |
Compared with MMSZ5267B and 1N4744A, the 1N5267B-T offers superior long-term stability via hermetic glass packaging and extended temperature range, making it irreplaceable in calibration-critical or high-reliability legacy systems despite obsolescence status.
Availability
1N5267B-T is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and calibration standard applications requiring stable component supply and traceable sourcing.
Supply support for 1N5267B-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, serving industrial, computing, consumer, and communications markets.
The 1N52xxB series was engineered as a high-stability, hermetically sealed Zener family for precision analog reference and protection in mission-critical instrumentation and aerospace-grade systems.
FAQ
Is the 1N5267B-T still in production?
No - Diodes Incorporated has officially discontinued the 1N5267B-T. It is marked "OBSOLETE – PART DISCONTINUED" in DS18006 Rev. 19. Aetrix Electronics maintains limited legacy stock with full traceability and supports last-time buys for ongoing maintenance of installed equipment.
What is the maximum reverse voltage before breakdown?
The 1N5267B-T begins regulated Zener breakdown at 71.25V (minimum specified VZ) and fully stabilizes near 75V at 1.7mA. Operation above 78.75V (maximum VZ) risks exceeding power limits unless current is strictly limited to prevent thermal runaway.
Can this diode replace the 1N5266B in a circuit?
Yes, with design verification: 1N5266B is 68V (64.6–71.4V), while 1N5267B is 75V (71.25–78.75V). The 7V difference affects regulation point and power dissipation - confirm that downstream components tolerate the higher clamping voltage and that thermal margins remain adequate at the new VZ.
Why does the datasheet specify lead length = 9.5mm?
The 9.5mm lead length is required to achieve the rated 500mW power dissipation and 300°C/W thermal resistance. Longer leads increase thermal resistance, causing junction overheating; shorter leads may violate mechanical stress limits during board flexure or thermal cycling.
1N5267B-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):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 270 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 56 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
1N5267B-T FAQ
1.How can I place an order for 1N5267B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5267B-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 1N5267B-T reliable?
The price and inventory of 1N5267B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5267B-T is usually 5 days.
3.What payment methods are accepted for 1N5267B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5267B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5267B-T?
1N5267B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5267B-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 1N5267B-T?
For technical support, including 1N5267B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5267B-T requirements.
6.How does Aetrix verify that 1N5267B-T is sourced from the original manufacturer or authorized distributors?
All 1N5267B-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 1N5267B-T meets industry standards.
7.What is the process for return or replacement of 1N5267B-T?
All 1N5267B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5267B-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 1N5267B-T part is unused and in its original packaging.
Return procedure for 1N5267B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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