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onsemi 1N5227B_T50R
- Part No.:
- 1N5227B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5227B_T50R.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,869
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Product details
Overview
1N5227B_T50R from ON Semiconductor is a 3.6 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 24 Ω dynamic impedance at 20 mA test current and 15 μA maximum reverse leakage at 2.88 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the 1N5227B_T50R datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, and direct alternatives for voltage reference design, power rail stabilization, and ESD-protected sensor interface circuits.
Technical Context
This device operates in reverse-biased Zener breakdown mode, delivering stable regulation across a 1–20 mA operating range. Its temperature coefficient of −0.065 %/°C ensures predictable drift in ambient-temperature-varying environments, and its 1.2 V forward voltage at 200 mA supports bidirectional protection use cases.
The DO-35 hermetically sealed glass package provides reliable long-term stability and low leakage performance. With a 25°C junction-to-ambient thermal resistance (calculated from 500 mW PD and 4.0 mW/°C derating), it supports continuous operation up to +175°C ambient when derated properly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.6 V nominal, min 3.42 V / max 3.78 V at IZ = 20 mA - defines regulated output voltage under standard test conditions |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power handling before thermal shutdown risk |
| Zener Impedance (ZZ) | 24 Ω at IZ = 20 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | 15 μA max at VR = 2.88 V - limits quiescent current in standby or high-impedance bias networks |
| Temperature Coefficient | −0.065 %/°C - quantifies VZ drift per degree Celsius, critical for temperature-sensitive references |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - enables use as bidirectional transient suppressor in low-energy clamping |
| Package | DO-35 glass case with cathode band - industry-standard axial leaded package for through-hole mounting and visual polarity identification |
Pinout & Package
DO-35 glass axial-leaded package: anode and cathode terminals identified by color band (cathode) on one end; no internal pins-two external leads only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower-potential node in Zener regulation | Reference ground or return path for current-sinking regulator configuration |
| Cathode | Negative terminal in forward bias; higher-potential node in Zener regulation | Regulated output node-voltage is stabilized relative to anode potential |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables cost-effective selection without tight-bin sorting while maintaining adequate accuracy for non-critical references |
| Low dynamic impedance (24 Ω) | Minimizes output voltage deviation under varying load currents in feedback or bias networks |
| Hermetic DO-35 glass package | Ensures long-term parameter stability and low moisture-induced leakage in industrial and automotive environments |
| Negligible reverse leakage (15 μA @ 2.88 V) | Preserves high-impedance node integrity in battery-powered sensor front-ends and microcontroller reset circuits |
| Controlled negative tempco (−0.065 %/°C) | Compensates typical positive tempcos of other components in mixed-technology voltage references |
Applications
| Microcontroller Reset Circuit | Op-Amp Reference Clamp |
|---|---|
|
Use Scenario: Provides precise 3.6 V threshold for brown-out detection in 3.3 V microcontroller systems. IC Role / Device Role / Timing Role: Zener diode acts as voltage threshold comparator element in conjunction with pull-up resistor and RC delay. Use Value: Ensures deterministic reset assertion below 3.6 V with minimal current draw (<20 μA standby), extending battery life in portable devices. |
Use Scenario: Limits op-amp output swing to protect downstream ADC inputs from overvoltage damage. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between op-amp output and ground, leveraging both Zener and forward conduction. Use Value: Clamps to +3.6 V and −1.2 V, preventing saturation-induced recovery delays and preserving signal fidelity in precision instrumentation. |
| Low-Power Sensor Biasing | Industrial Signal Conditioning |
|
Use Scenario: Supplies stable bias voltage to analog-output temperature sensors in HVAC control modules. IC Role / Device Role / Timing Role: Passive voltage reference sourcing constant current into sensor's excitation path. Use Value: Maintains <±2% regulation over −40°C to +85°C ambient due to predictable tempco and low thermal resistance. |
Use Scenario: Stabilizes 5 V rail-derived 3.6 V supply for isolated RS-485 transceiver bias in factory automation PLCs. IC Role / Device Role / Timing Role: Shunt regulator absorbing excess current from series resistor to maintain fixed node voltage. Use Value: Delivers 3.6 V ±3% across 1–15 mA load range with <50 mV ripple suppression, meeting IEC 61000-4-5 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5227B (DO-35, no suffix) | Identical electrical specs and DO-35 package; T50R denotes tape-and-reel packaging variant per ON Semi standard | No functional difference-same thermal, electrical, and mechanical behavior in PCB layout | Select 1N5227B_T50R for automated SMT assembly; choose bulk 1N5227B for manual prototyping or low-volume repair |
| BZX55-C3V6 (DO-35) | Same 3.6 V nominal, ±5% tolerance, but higher ZZ (30 Ω) and looser tempco (±0.05%/°C); JEDEC-compliant but not ON Semi branded | Suitable for non-critical regulation where tighter impedance or tempco isn't required | Prefer 1N5227B_T50R when traceability to ON Semi's quality system and documented reliability data is mandatory |
Compared with 1N5227B (bulk) and BZX55-C3V6, the 1N5227B_T50R offers identical regulation performance with certified tape-and-reel logistics support, while providing superior impedance control and manufacturer-backed lifetime reliability data for industrial deployments.
Availability
1N5227B_T50R is available at Aetrix Electronics and suitable for microcontroller reset circuits, op-amp output clamping, low-power sensor biasing, and industrial signal conditioning requiring stable component supply and full traceability.
Supply support for 1N5227B_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 supplier delivering energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, medical, and consumer electronics.
The 1N5227B_T50R belongs to the legacy 1N52xxB Zener diode family, designed specifically for general-purpose voltage regulation and reference applications where reliability, consistency, and JEDEC-standard packaging are essential.
FAQ
What is the Zener voltage tolerance and test condition for 1N5227B_T50R?
The 1N5227B_T50R has a Zener voltage tolerance of ±5%, specified as 3.42 V (min) to 3.78 V (max) at a test current of 20 mA and ambient temperature of 25°C. This tolerance reflects manufacturing spread under standardized thermal equilibrium conditions defined in ON Semiconductor's datasheet Rev. 3.
Does 1N5227B_T50R support bidirectional voltage clamping?
Yes, the 1N5227B_T50R supports bidirectional clamping: in reverse bias it regulates at 3.6 V (Zener mode), and in forward bias it conducts at ≤1.2 V (as a standard silicon diode). This dual-mode behavior enables symmetric transient protection in low-energy analog interfaces without adding discrete diodes.
What is the maximum allowable ambient temperature for continuous operation of 1N5227B_T50R?
The 1N5227B_T50R can operate continuously up to +175°C ambient when power dissipation is derated linearly above +50°C at 4.0 mW/°C. At 25°C, its 500 mW rating drops to 0 mW at +175°C, meaning full-rated power is only permissible below +50°C unless heat sinking or airflow is applied.
How is cathode polarity identified on the 1N5227B_T50R DO-35 package?
The cathode of the 1N5227B_T50R is marked by a distinct color band (typically black or dark gray) located near one end of the DO-35 glass body. This band aligns with the cathode terminal, which must be connected to the higher-potential node during Zener regulation operation.
Is 1N5227B_T50R RoHS compliant and halogen-free?
Yes, the 1N5227B_T50R meets RoHS Directive 2011/65/EU and is halogen-free per ON Semiconductor's material declarations. The DO-35 glass package contains no lead in solderable terminations, and all materials comply with IEC 61249-2-21 standards for bromine and chlorine content.
1N5227B_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):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 24 Ohms
- Current - Reverse Leakage @ Vr:
- 15 µA @ 1 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
1N5227B_T50R FAQ
1.How can I place an order for 1N5227B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5227B_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 1N5227B_T50R reliable?
The price and inventory of 1N5227B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5227B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5227B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5227B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5227B_T50R?
1N5227B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5227B_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 1N5227B_T50R?
For technical support, including 1N5227B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5227B_T50R requirements.
6.How does Aetrix verify that 1N5227B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5227B_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 1N5227B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5227B_T50R?
All 1N5227B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5227B_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 1N5227B_T50R part is unused and in its original packaging.
Return procedure for 1N5227B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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