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Diodes Incorporated 1N5261B-T
- Part No.:
- 1N5261B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5261B-T.pdf
- Description:
- DIODE ZENER 47V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,983
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Product details
Overview
1N5261B-T from Diodes Incorporated is a 47 V, ±5% tolerance, 500 mW surface-mount Zener diode in a hermetic DO-35 glass package, optimized for precision voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning stages.
For engineers reviewing the 1N5261B-T datasheet, 1N5261B-T pinout, 1N5261B-T application, or 1N5261B-T equivalent, key selection criteria include Zener voltage stability over temperature (±0.095 %/°C), low maximum Zener impedance (105 Ω at 2.7 mA), reverse leakage ≤0.1 µA at 36 V, and RoHS-compliant Sn96.5Ag3.5 terminations suitable for automated SMT assembly.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 47 V reference across load variations and input fluctuations. Its epitaxial construction ensures tight voltage tolerance (±5%), low dynamic impedance (105 Ω at IZT = 2.7 mA), and predictable temperature coefficient (+0.095 %/°C).
The DO-35 glass package provides hermetic sealing for long-term reliability in industrial environments, with thermal resistance of 300 °C/W (junction-to-ambient) under standard lead conditions (9.5 mm length, TL ≤75°C). It is rated for operation from –65°C to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal, 44.65–49.35 V range at 2.7 mA - enables precise 47 V regulation in feedback networks |
| Power Dissipation | 500 mW - supports continuous operation in low-power reference and clamp circuits without forced cooling |
| Zener Impedance (ZZT) | 105 Ω at 2.7 mA - ensures minimal output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | ≤0.1 µA at 36 V - guarantees negligible current draw in high-impedance bias/reference paths |
| Temperature Coefficient | +0.095 %/°C - allows predictable voltage drift compensation in wide-temperature designs |
| Operating Temperature | –65°C to +175°C - qualified for harsh-environment industrial and automotive under-hood applications |
Pinout & Package
Package: DO-35 glass axial package with cathode band marking; dimensions: 25.4 mm overall length (A), 4.0 mm max body diameter (B), 0.6 mm max lead diameter (C), 2.0 mm max lead spacing (D); weight ≈0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulator configuration |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to unregulated input; maintains stable 47 V relative to anode during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Package | DO-35 construction prevents moisture ingress and ensures long-term parameter stability in humid or corrosive environments |
| Lead-Free Termination | Sn96.5Ag3.5 finish compliant with RoHS 2015/863/EU and MIL-STD-202 solderability requirements |
| High Voltage Stability | ±5% VZ tolerance and +0.095 %/°C TC enable repeatable performance across production batches and temperature cycles |
| Low Reverse Leakage | ≤0.1 µA at 36 V minimizes error in high-impedance reference dividers and sensor bias networks |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters. IC Role / Device Role: Shunt reference element in optocoupler feedback loop. Use Value: Maintains ±1% output accuracy by providing stable 47 V reference to TL431 or similar controller. |
Use Scenario: Protecting microcontroller I/O pins from transient surges on 48 V bus lines. IC Role / Device Role: Passive clamping diode between signal line and ground. Use Value: Limits voltage to 47 V ±5%, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. |
| Reference Voltage Source | Analog Signal Conditioning |
Use Scenario: Generating precision bias voltage for op-amp input stages in industrial transmitters. IC Role / Device Role: Low-drift Zener reference for DAC output buffering. Use Value: Delivers 47 V reference with <105 Ω dynamic impedance, reducing noise coupling into sensitive analog paths. |
Use Scenario: Level-shifting and clamping analog sensor outputs before ADC sampling. IC Role / Device Role: Voltage limiter in front-end protection network for thermocouple amplifiers. Use Value: Clamps excursions above 47 V while contributing <0.1 µA leakage, preserving signal integrity in µA-level sensor circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5261B | Surface-mount SOD-123 package; same 47 V rating, ±5% tolerance, but lower power (350 mW) and higher ZZT (120 Ω) | Designed for high-density PCBs where DO-35 axial footprint is prohibitive | Select when board space is constrained and thermal derating below 350 mW is acceptable |
| 1N4756A | Through-hole DO-41 package; 47 V, ±5%, 1 W power rating, ZZT = 20 Ω at 13 mA | Supports higher continuous power dissipation and lower impedance in legacy through-hole designs | Choose for robustness in high-current clamp or high-stability reference where 1 W rating and 20 Ω ZZT are critical |
Compared with MMSZ5261B, the 1N5261B-T offers higher power handling (500 mW vs. 350 mW) and lower Zener impedance (105 Ω vs. 120 Ω), while compared with 1N4756A it trades off power and impedance for smaller size and RoHS-compliant termination - making it optimal for space-constrained, medium-power SMT reference designs.
Availability
1N5261B-T is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, precision reference, and analog signal conditioning requiring stable component supply and long-lifecycle support despite its obsolete status.
Supply support for 1N5261B-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, specializing in high-reliability components for industrial, computing, and consumer applications.
The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered for stable voltage reference and regulation in cost-sensitive, high-volume power management systems.
FAQ
Is the 1N5261B-T still in production?
No - Diodes Incorporated has discontinued the 1N5261B-T and marked it obsolete per DS18006 Rev. 19. However, Aetrix Electronics maintains legacy inventory and offers controlled-life supply with full traceability and documentation for ongoing production programs requiring this specific part.
What is the forward voltage drop of the 1N5261B-T?
The forward voltage (VF) is specified as 1.1 V at IF = 200 mA. This value applies only during forward conduction; the device is intended for reverse-bias Zener operation, not rectification.
Can the 1N5261B-T be used in place of the 1N4756A?
Electrically, both provide 47 V Zener regulation, but the 1N5261B-T is rated for 500 mW (vs. 1 W for 1N4756A) and uses a DO-35 glass package instead of DO-41. Substitution requires verifying thermal margin and mechanical fit; it is not a direct drop-in replacement in high-power or through-hole designs.
What does the "-T" suffix indicate in 1N5261B-T?
The "-T" suffix denotes tape-and-reel packaging: 10,000 units per reel, compatible with automated SMT placement equipment. The base part number 1N5261B refers to the bare device; "-T" specifies the standard shipping format for surface-mount assembly.
1N5261B-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):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 105 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 36 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
1N5261B-T FAQ
1.How can I place an order for 1N5261B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5261B-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 1N5261B-T reliable?
The price and inventory of 1N5261B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5261B-T is usually 5 days.
3.What payment methods are accepted for 1N5261B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5261B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5261B-T?
1N5261B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5261B-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 1N5261B-T?
For technical support, including 1N5261B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5261B-T requirements.
6.How does Aetrix verify that 1N5261B-T is sourced from the original manufacturer or authorized distributors?
All 1N5261B-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 1N5261B-T meets industry standards.
7.What is the process for return or replacement of 1N5261B-T?
All 1N5261B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5261B-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 1N5261B-T part is unused and in its original packaging.
Return procedure for 1N5261B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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