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onsemi 1N5261B_T50A
- Part No.:
- 1N5261B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5261B_T50A.pdf
- Description:
- DIODE ZENER 47V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,602
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Product details
Overview
1N5261B_T50A from ON Semiconductor is a 47 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 105 Ω dynamic impedance at 10 mA test current, and 0.25 μA maximum reverse leakage at 36 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5261B_T50A datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, and direct-fit alternatives for legacy Fairchild/ON Semi designs requiring stable 47 V Zener clamping.
Technical Context
The 1N5261B_T50A operates as a two-terminal voltage-reference device relying on controlled avalanche breakdown in silicon. Its Zener voltage is specified at 10 mA (IZ), with guaranteed min/typ/max values of 44.65 V / 47 V / 49.35 V and temperature coefficient of +0.095 %/°C - indicating positive drift above 25°C. It exhibits 2.7 Ω knee impedance (ZZK) at 1 mA (IZK), confirming sharp turn-on for reference use.
Designed for through-hole mounting in DO-35 glass packages, the device features hermetically sealed construction, 0.137 g mass, and lead temperature rating of +230°C for 10 s. Absolute maximum junction temperature is +200°C, with storage range spanning −65°C to +200°C - supporting industrial and automotive under-hood environments where thermal cycling is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal at 10 mA; ±5% tolerance ensures 44.65–49.35 V regulation window for stable reference design |
| Power Dissipation (PD) | 500 mW at 25°C; derates linearly by 4.0 mW/°C above 50°C - defines max continuous bias current in regulator circuits |
| Dynamic Impedance (ZZ) | 105 Ω at IZ = 10 mA; determines output voltage variation under load changes in shunt regulator topologies |
| Reverse Leakage (IR) | ≤0.1 μA at VR = 36 V; guarantees minimal quiescent current in standby or battery-backed systems |
| Temperature Coefficient (TC) | +0.095 %/°C; quantifies VZ drift per degree - critical for high-accuracy references across temperature ranges |
| Knee Impedance (ZZK) | 2.7 Ω at IZK = 1 mA; indicates low-voltage-drop onset behavior for low-current regulation applications |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA; enables use as polarity-sensitive clamp or ESD protection element in bidirectional circuits |
Pinout & Package
DO-35 glass axial package with cathode identified by color band; leads are unmarked anode/cathode terminals suitable for manual or wave soldering. Hermetically sealed construction meets JEDEC DO-204AH standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias | Connected to lower-potential node in shunt regulator; used for ESD clamping to ground |
| Cathode | Current exit terminal during forward bias; Zener breakdown terminal | Marked with color band; connected to regulated voltage rail in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% ensures predictable regulation without post-production trimming in cost-sensitive analog designs |
| Low reverse leakage current | ≤0.1 μA at 36 V minimizes standby power loss in battery-powered instrumentation and sensor nodes |
| Stable temperature coefficient | +0.095 %/°C enables predictable VZ drift modeling for compensated reference circuits |
| Hermetic DO-35 glass package | JEDEC-compliant sealing supports long-term reliability in humid or chemically aggressive environments |
| High surge capability | Rated for non-recurrent 8.3 ms pulses at TA = 50°C - suitable for transient overvoltage suppression |
Applications
| Industrial Sensor Reference | Power Supply Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable excitation voltage for resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining 47 V rail for ratiometric ADC scaling. Use Value: ±5% VZ tolerance and +0.095 %/°C TC enable <±1% total error over −40°C to +85°C without calibration. | Use Scenario: Clamping DC bus voltage spikes in 48 V telecom power supplies during load dump events. IC Role / Device Role / Timing Role: Two-terminal overvoltage protector diverting surge current away from downstream regulators. Use Value: 500 mW PD rating and 105 Ω ZZ allow safe dissipation of 100–200 ms transients up to 50 V peak. |
| Microcontroller Reset Circuit | Legacy Analog Instrumentation |
Use Scenario: Generating precise reset threshold for 3.3 V microcontrollers using resistor-divider + Zener feedback. IC Role / Device Role / Timing Role: Voltage-sensing element in RC-based power-on reset generator. Use Value: Low 0.1 μA IR prevents premature discharge of timing capacitor, ensuring reliable reset pulse width. | Use Scenario: Calibrating analog panel meters and potentiometric controls in industrial control panels. IC Role / Device Role / Timing Role: Fixed reference source for analog-to-digital conversion and signal conditioning stages. Use Value: DO-35 mechanical stability and hermetic seal ensure long-term VZ drift <100 ppm/year in fixed-installation equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5261BRLG | Same electrical specs; tape-and-reel packaging (T50A = bulk, RL = reel); identical DO-35 package and marking | No functional difference; selected for automated assembly vs. manual/hand-solder prototyping | Choose 1N5261BRLG for SMT line integration; retain 1N5261B_T50A for low-volume repair or evaluation |
| BZX55-C47 | 47 V ±5%, but higher ZZ (120 Ω @ 5 mA) and looser TC (±0.1 %/°C); same DO-35 package | Suitable for non-critical clamping; not recommended for precision reference due to wider TC and impedance spread | Select BZX55-C47 only when cost sensitivity outweighs regulation accuracy requirements |
Compared with 1N5261B_T50A, 1N5261BRLG offers identical performance in reel format for production lines, while BZX55-C47 trades tighter TC and lower ZZ for broader availability and lower unit cost - making it viable only in non-precision overvoltage roles.
Availability
1N5261B_T50A is available at Aetrix Electronics and suitable for industrial sensor reference, power supply overvoltage clamp, and microcontroller reset circuit applications requiring stable component supply and long-lifecycle support.
Supply support for 1N5261B_T50A 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N52xxB series was designed as a general-purpose, high-reliability Zener diode family for voltage regulation and protection in cost-sensitive, high-volume applications - emphasizing tight tolerance, stable TC, and robust DO-35 packaging.
FAQ
What is the Zener voltage tolerance of the 1N5261B_T50A?
The 1N5261B_T50A has a Zener voltage tolerance of ±5%, meaning its nominal 47 V rating spans 44.65 V to 49.35 V at 10 mA test current and 25°C ambient. This tolerance is guaranteed across production lots and supports consistent performance in untrimmed reference designs without post-manufacturing calibration.
Does the 1N5261B_T50A have a cathode marking, and how is it identified?
Yes, the 1N5261B_T50A uses a color band on the DO-35 glass body to denote the cathode terminal. This band aligns with JEDEC DO-204AH standards and must be oriented toward the higher-potential node in shunt regulator configurations. The anode remains unmarked, and correct polarity is essential to achieve Zener breakdown operation.
What is the maximum power dissipation for the 1N5261B_T50A at 75°C ambient?
At 75°C ambient, the 1N5261B_T50A's power dissipation is derated from 500 mW by 4.0 mW/°C above 50°C. That yields 500 mW − (25°C × 4.0 mW/°C) = 400 mW maximum continuous dissipation. Exceeding this risks thermal runaway or accelerated parameter drift, especially given its +0.095 %/°C temperature coefficient.
Can the 1N5261B_T50A be used in place of the 1N5261BRLG?
Yes, the 1N5261B_T50A is functionally identical to the 1N5261BRLG - differing only in packaging format (bulk vs. tape-and-reel). Both share identical electrical specifications, DO-35 package dimensions, marking layout, and thermal ratings. The choice depends solely on assembly method: T50A for manual/hand-solder use, RL for automated pick-and-place.
What is the reverse leakage current specification for the 1N5261B_T50A at 36 V?
The 1N5261B_T50A specifies a maximum reverse leakage current (IR) of 0.1 μA at VR = 36 V and TA = 25°C. This ultra-low leakage supports energy-efficient operation in battery-powered devices and ensures minimal loading on high-impedance reference nodes - critical for precision analog front-ends and sensor signal chains.
1N5261B_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- 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:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5261B_T50A FAQ
1.How can I place an order for 1N5261B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5261B_T50A 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_T50A reliable?
The price and inventory of 1N5261B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5261B_T50A is usually 5 days.
3.What payment methods are accepted for 1N5261B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5261B_T50A transactions.
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4.How is shipping managed for 1N5261B_T50A?
1N5261B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5261B_T50A 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_T50A?
For technical support, including 1N5261B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5261B_T50A requirements.
6.How does Aetrix verify that 1N5261B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N5261B_T50A 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_T50A meets industry standards.
7.What is the process for return or replacement of 1N5261B_T50A?
All 1N5261B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5261B_T50A, 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_T50A part is unused and in its original packaging.
Return procedure for 1N5261B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5261B_T50A Tags
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