My Inquiry
My Account
onsemi 1N5261B_T50R
- Part No.:
- 1N5261B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5261B_T50R.pdf
- Description:
- DIODE ZENER 47V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,771
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5261B_T50R from ON Semiconductor is a 47 V ±5% 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 serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback loops, and sensor signal conditioning stages.
For engineers reviewing the 1N5261B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include its 47 V nominal Zener voltage, tight 5% tolerance, low temperature coefficient of +0.095 %/°C, DO-35 mechanical compatibility, and suitability for space-constrained linear regulator and protection designs.
Technical Context
This device operates in reverse-biased Zener breakdown mode, delivering stable voltage regulation across 1–20 mA operating current range. Its junction temperature range spans –65°C to +200°C, and thermal derating begins above 50°C at 4.0 mW/°C.
The DO-35 hermetically sealed glass package ensures long-term stability and low leakage, with cathode identified by a color band. Forward voltage is specified ≤1.2 V at 200 mA, confirming standard silicon PN junction behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal, min 44.65 V / max 49.35 V at IZ = 10 mA - defines precise clamping or reference level in feedback networks |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC or pulsed power handling in linear regulation |
| Zener Impedance (ZZ) | 105 Ω at IZ = 10 mA - indicates voltage regulation stiffness; lower values improve load regulation |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 36 V - ensures minimal error current in high-impedance reference paths |
| Temperature Coefficient (TC) | +0.095 %/°C - quantifies VZ drift with ambient change; critical for temperature-stable references |
| Package | DO-35 glass case - industry-standard axial leaded package with cathode band marking and 0.137 g mass |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - confirms standard silicon diode conduction for polarity verification or series protection use |
Pinout & Package
DO-35 glass axial package: hermetically sealed, cathode indicated by single color band; total length ≥25.40 mm (T50), body diameter 1.91 mm, lead diameter 0.46 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse bias return path | Connected to lower-potential node in Zener regulation; used for forward conduction checks |
| Cathode | Zener voltage reference output / reverse bias input | Marked with color band; connects to regulated node (e.g., op-amp feedback or shunt regulator output) |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable clamping without post-production trimming in cost-sensitive consumer and industrial supplies |
| Low 0.25 μA leakage at 36 V | Minimizes error current in high-impedance voltage divider or microcontroller reference circuits |
| +0.095 %/°C tempco | Supports stable operation across –40°C to +85°C ambient without external compensation |
| DO-35 glass hermetic seal | Provides long-term parameter stability and moisture resistance in harsh environments |
| 500 mW power rating | Allows direct use in 5–12 V supply rail clamping and low-current shunt regulators without heatsinking |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing analog front-end reference voltage for 12-bit ADCs in temperature or pressure transmitters. IC Role / Device Role / Timing Role: Zener diode provides fixed 47 V reference for op-amp gain-setting network or isolated feedback divider. Use Value: Tight 5% tolerance and low TC ensure <±1% reference drift over –25°C to +70°C operating range. |
Use Scenario: Protecting 3.3 V or 5 V MCU I/O pins from transient overvoltage on shared bus lines. IC Role / Device Role / Timing Role: Shunt clamp absorbs ESD or inductive kick energy before it reaches sensitive GPIO structures. Use Value: 47 V standoff allows normal 5 V operation while clamping >36 V transients with sub-μA leakage. |
| Linear Voltage Regulator Feedback | Legacy Analog Power Supply Reference |
Use Scenario: Setting output voltage in discrete NPN/PNP pass transistor regulators for lab bench supplies. IC Role / Device Role / Timing Role: Zener establishes reference voltage applied to base of error amplifier transistor. Use Value: 105 Ω ZZ ensures <0.1 V output variation under 10 mA load step changes. |
Use Scenario: Replacing obsolete Zeners in maintenance of vintage test equipment requiring 47 V reference. IC Role / Device Role / Timing Role: Direct drop-in replacement for legacy 1N5261B in circuit boards using DO-35 footprint. Use Value: Identical electrical specs and DO-35 mechanical form enable zero-layout-change field repair. |
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; green RoHS-compliant marking instead of T50R suffix; identical DO-35 package | No functional difference; used where RoHS compliance documentation is required | Select 1N5261BRLG when environmental certification is mandatory; otherwise 1N5261B_T50R is functionally identical |
| BZX55-C47 | 47 V ±5%, 500 mW, but higher ZZ = 130 Ω at 5 mA and wider tempco (±0.08%/°C); DO-35 package | Suitable for non-critical clamping but less stable in precision references due to higher impedance and looser TC | Choose BZX55-C47 only if cost is primary driver and 1N5261B_T50R's tighter ZZ and TC are not required |
Compared with 1N5261B_T50R, 1N5261BRLG offers identical performance with RoHS traceability, while BZX55-C47 trades regulation accuracy for broader availability and lower cost-making 1N5261B_T50R optimal for stable reference designs demanding low ZZ and predictable TC.
Availability
1N5261B_T50R is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, and linear regulator feedback networks requiring stable component supply and long-lifecycle support.
Supply support for 1N5261B_T50R 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 power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1N52xxB series belongs to ON Semiconductor's legacy Zener diode product line, designed for general-purpose voltage regulation and clamping in cost-sensitive, space-constrained linear power and signal conditioning circuits.
FAQ
What is the Zener voltage tolerance of the 1N5261B_T50R?
The 1N5261B_T50R has a Zener voltage tolerance of ±5%, meaning its nominal 47 V rating falls between 44.65 V and 49.35 V when measured at 10 mA test current and 25°C ambient. This tolerance is confirmed in the ON Semiconductor datasheet Rev. 3 (December 2018) and applies directly to the 1N5261B_T50R variant.
Does the 1N5261B_T50R have a specified temperature coefficient?
Yes, the 1N5261B_T50R has a temperature coefficient of +0.095 %/°C, indicating its Zener voltage increases by approximately 0.045 V per 10°C rise in junction temperature. This value is explicitly listed in the Electrical Characteristics table for the 1N5261B entry and applies to the 1N5261B_T50R as a standard variant of that part number.
What is the maximum reverse leakage current for the 1N5261B_T50R?
The 1N5261B_T50R exhibits a maximum reverse leakage current of 0.25 μA when biased at 36 V (76% of its nominal Zener voltage). This specification is verified in the ON Semiconductor 1N5221B–1N5263B datasheet and reflects worst-case leakage under defined test conditions, ensuring reliable performance in high-impedance reference paths.
Is the 1N5261B_T50R compatible with DO-35 footprint layouts?
Yes, the 1N5261B_T50R uses the JEDEC DO-35 axial glass package with standardized dimensions: minimum length 25.40 mm (T50), body diameter 1.91 mm, and cathode marked by a visible color band. These mechanical specifications match the DO-35 footprint used in legacy and new designs, confirming physical compatibility for the 1N5261B_T50R.
What is the power dissipation rating of the 1N5261B_T50R at elevated temperatures?
The 1N5261B_T50R is rated for 500 mW at 25°C ambient, with linear derating of 4.0 mW/°C above 50°C. At 70°C ambient, its usable power drops to 420 mW; at 100°C, it falls to 300 mW. This derating curve is defined in the Absolute Maximum Ratings section of the official ON Semiconductor datasheet for the 1N5261B_T50R.
1N5261B_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5261B_T50R FAQ
1.How can I place an order for 1N5261B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5261B_T50R 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_T50R reliable?
The price and inventory of 1N5261B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5261B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5261B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5261B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5261B_T50R?
1N5261B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5261B_T50R 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_T50R?
For technical support, including 1N5261B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5261B_T50R requirements.
6.How does Aetrix verify that 1N5261B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5261B_T50R 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_T50R meets industry standards.
7.What is the process for return or replacement of 1N5261B_T50R?
All 1N5261B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5261B_T50R, 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_T50R part is unused and in its original packaging.
Return procedure for 1N5261B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5261B_T50R Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
