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onsemi 1N5222B_T50R
- Part No.:
- 1N5222B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5222B_T50R.pdf
- Description:
- DIODE ZENER 2.5V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
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Product details
Overview
1N5222B_T50R from ON Semiconductor is a 2.5 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation and 20 mA test current, with 30 Ω dynamic impedance and -0.085 %/°C temperature coefficient - used for precision voltage reference and low-power regulation in analog sensor signal conditioning circuits.
For engineers reviewing the 1N5222B_T50R datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, and direct-fit alternatives for legacy through-hole voltage reference designs.
Technical Context
This device operates as a two-terminal voltage reference where reverse-biased junction breakdown provides stable DC voltage under controlled current. It requires external series resistance to limit Zener current and maintain thermal equilibrium at 25°C ambient.
The DO-35 package features axial leads with cathode band marking, hermetically sealed glass construction, and 0.137 g mass. Thermal derating begins at 50°C at 4.0 mW/°C, supporting operation up to +200°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.5 V nominal at IZ = 20 mA - defines stable reference point for biasing or clamping. |
| Tolerance | ±5% - ensures VZ falls between 2.375 V and 2.625 V, critical for accuracy-critical references. |
| Dynamic Impedance (ZZ) | 30 Ω at IZ = 20 mA - indicates low sensitivity to current variation, improving regulation stability. |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous power before thermal shutdown or degradation. |
| Temperature Coefficient (TC) | -0.085 %/°C - quantifies VZ drift with temperature; negative sign indicates decreasing voltage as temperature rises. |
| Reverse Leakage (IR) | 100 μA max at VR = 1.0 V - defines minimum off-state current, affecting high-impedance node loading. |
Pinout & Package
DO-35 glass axial package with cathode identified by color band on body; leads are unmarked anode/cathode terminals requiring orientation verification via band during PCB placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit ground or lower potential; forward voltage ≤1.2 V at 200 mA enables use as clamp or protection diode. |
| Cathode | Zener breakdown terminal / regulated output node | Marked with color band; supplies stable 2.5 V when reverse biased with current limited to 20 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Ensures long-term parameter stability and moisture resistance in industrial environments. |
| Low temperature coefficient | -0.085 %/°C enables <10 mV drift over 0–70°C range, suitable for non-compensated references. |
| Precision ±5% tolerance | Reduces need for post-production trimming in cost-sensitive analog front-ends. |
| DO-35 mechanical standardization | Supports automated insertion and wave soldering per JEDEC DO-204AH specification. |
Applications
| Industrial Sensor Biasing | Low-Power Voltage Reference |
|---|---|
|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in HVAC control modules. IC Role / Device Role / Timing Role: Zener reference source establishing fixed 2.5 V bias across RTD bridge. Use Value: Enables <±0.5% measurement accuracy without active regulation, reducing BOM count and standby power. |
Use Scenario: Generating reference voltage for 8-bit ADC in battery-powered data loggers. IC Role / Device Role / Timing Role: Passive voltage reference replacing higher-quiescent LDOs in ultra-low-power sleep modes. Use Value: Draws zero static current in shutdown state while maintaining 2.5 V reference integrity for wake-up comparators. |
| Overvoltage Clamp | Signal Level Shifting |
|
Use Scenario: Protecting microcontroller GPIO pins from transient surges in automotive body electronics. IC Role / Device Role / Timing Role: Reverse-biased shunt clamp limiting input voltage to 2.5 V + Vf. Use Value: Absorbs >100 mA surge pulses without latch-up, preserving MCU I/O integrity per ISO 7637-2 Pulse 1/2a. |
Use Scenario: Translating 3.3 V logic signals to 2.5 V interface levels in mixed-voltage FPGA systems. IC Role / Device Role / Timing Role: Cathode-referenced level translator using forward conduction and Zener knee. Use Value: Achieves sub-10 ns propagation delay with no external bias supply, simplifying level-shift design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, 1 W rating, 10 Ω ZZ, ±5% tolerance | Higher power and voltage; unsuitable for 2.5 V circuits without redesign | Select only if system requires ≥3.3 V reference and can accommodate higher thermal load. |
| BZX55C2V4 | 2.4 V nominal, ±5%, 600 mW, 100 Ω ZZ, DO-35 | Lower VZ, higher impedance, same package - minor voltage shift but reduced regulation fidelity | Acceptable for non-critical biasing where 100 mV offset and 3× higher ZZ are tolerable. |
Compared with 1N4728A and BZX55C2V4, the 1N5222B_T50R offers optimal balance of 2.5 V targeting, low ZZ, and proven thermal stability in space-constrained DO-35 layouts - making it preferred for precision analog interfaces where voltage accuracy and impedance matter more than raw power handling.
Availability
1N5222B_T50R is available at Aetrix Electronics and suitable for industrial sensor biasing, low-power voltage reference, overvoltage clamp, and signal level shifting applications requiring stable component supply and long-lifecycle support.
Supply support for 1N5222B_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 energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N52xxB series was designed specifically for general-purpose, low-current Zener reference and voltage regulation in cost-sensitive, high-reliability through-hole applications.
FAQ
What is the Zener voltage tolerance of the 1N5222B_T50R?
The 1N5222B_T50R has a ±5% tolerance on its nominal 2.5 V Zener voltage, meaning the actual measured VZ at 20 mA will fall between 2.375 V and 2.625 V under standard test conditions (TA = 25°C, lead temperature = 30°C ±1°C). This tolerance is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3.
Can the 1N5222B_T50R be used in surface-mount designs?
No - the 1N5222B_T50R uses a DO-35 glass axial package with radial leads intended for through-hole mounting. It is not compatible with SMT reflow or pick-and-place processes. For surface-mount equivalents, consider ON Semiconductor's NSZ5V1AXV6T1G (SOD-323) or similar SMT Zeners with matched 2.5 V rating.
What is the maximum reverse leakage current for the 1N5222B_T50R?
The 1N5222B_T50R specifies a maximum reverse leakage current (IR) of 100 μA at VR = 1.0 V, per the Electrical Characteristics table in the official ON Semiconductor datasheet. This value is measured at TA = 25°C and confirms minimal off-state loading in high-impedance reference nodes.
How does thermal derating affect the 1N5222B_T50R's power handling?
The 1N5222B_T50R derates linearly above 50°C ambient at 4.0 mW/°C. At 75°C, its usable power drops to 400 mW; at 100°C, it falls to 300 mW. This derating must be applied in enclosed or thermally constrained designs to prevent junction overheating beyond the +200°C absolute maximum rating.
Is the 1N5222B_T50R RoHS compliant and halogen-free?
Yes - the 1N5222B_T50R meets RoHS Directive 2011/65/EU requirements 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 JEDEC J-STD-609A Class 1 definitions for halogen content.
1N5222B_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):
- 2.5 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 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
1N5222B_T50R FAQ
1.How can I place an order for 1N5222B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5222B_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 1N5222B_T50R reliable?
The price and inventory of 1N5222B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5222B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5222B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5222B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5222B_T50R?
1N5222B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5222B_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 1N5222B_T50R?
For technical support, including 1N5222B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5222B_T50R requirements.
6.How does Aetrix verify that 1N5222B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5222B_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 1N5222B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5222B_T50R?
All 1N5222B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5222B_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 1N5222B_T50R part is unused and in its original packaging.
Return procedure for 1N5222B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5222B_T50R Tags
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