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onsemi 1N5225B_T50R
- Part No.:
- 1N5225B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5225B_T50R.pdf
- Description:
- DIODE ZENER 3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,943
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Product details
Overview
1N5225B_T50R from ON Semiconductor is a 3.0 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 29 Ω dynamic impedance at 20 mA test current and -0.075 %/°C temperature coefficient. It provides stable voltage reference in low-power analog circuits, precision biasing networks, and overvoltage protection clamps.
For engineers reviewing the 1N5225B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (3.0 V), tolerance (±5%), maximum power rating (500 mW), thermal derating slope (4.0 mW/°C above 50°C), and cathode-band polarity marking on DO-35 glass case.
Technical Context
This device operates as a reverse-biased silicon Zener diode, maintaining regulated voltage across its terminals when reverse current exceeds the knee current (IZK = 0.25 mA). Its 3.0 V nominal breakdown voltage is specified at 20 mA test current (IZ), with typical dynamic impedance (ZZ) of 29 Ω under those conditions.
The DO-35 hermetically sealed glass package ensures long-term stability and low leakage (IR ≤ 50 μA at VR = 2.4 V), while the -0.075 %/°C temperature coefficient enables predictable drift behavior in ambient temperature variations from -65°C to +200°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V nominal, min 2.85 V / max 3.15 V at IZ = 20 mA - defines precise regulation point for reference circuits |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous power handling before thermal shutdown risk |
| Dynamic Impedance (ZZ) | 29 Ω at IZ = 20 mA - determines output voltage variation under load current changes |
| Temperature Coefficient (TC) | -0.075 %/°C - quantifies voltage drift per degree Celsius rise in junction temperature |
| Reverse Leakage (IR) | ≤50 μA at VR = 2.4 V - ensures minimal quiescent current in standby clamp or reference mode |
| 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 package: axial-leaded, hermetically sealed, 0.533 mm diameter body, 4.56 mm length, cathode identified by color band. Lead spacing T50R denotes 25.40 mm minimum (2×) lead spacing per JEDEC DO-204AH standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential node in reverse-bias regulation; carries forward current up to 200 mA (VF ≤ 1.2 V) |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher potential node during regulation; defines reference voltage node |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tight regulation without external trimming in cost-sensitive voltage reference designs |
| Low dynamic impedance (29 Ω) | Minimizes output voltage deviation under varying load currents in feedback or sensing paths |
| Negligible forward voltage (1.2 V max @ 200 mA) | Supports bidirectional protection schemes where forward conduction must remain low-loss |
| Wide operating junction temperature (-65°C to +200°C) | Permits use in automotive engine compartments, industrial controls, and high-reliability environments |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Providing stable 3.0 V reference to bias input stages of rail-to-rail op-amps in battery-powered instrumentation. IC Role / Device Role / Timing Role: Zener diode acts as passive two-terminal voltage reference source, replacing more complex IC references where ultra-low drift is not required. Use Value: Delivers 3.0 V ±5% accuracy with <29 Ω output impedance, enabling stable DC offset control without active regulation circuitry. | Use Scenario: Protecting ADC input pins from transient overvoltage events exceeding 3.3 V supply in environmental sensor modules. IC Role / Device Role / Timing Role: Functions as shunt clamp, diverting excess current to ground when input voltage exceeds 3.0 V + diode forward drop. Use Value: Limits peak voltage to ≤3.0 V + 1.2 V = 4.2 V with ≤50 μA leakage below clamp threshold, preserving signal integrity. |
| Low-Power Microcontroller Reset Circuit | Current-Limited LED Biasing |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers using RC delay and Zener-triggered transistor switch. IC Role / Device Role / Timing Role: Serves as precision voltage threshold detector in discrete reset generator topology. Use Value: Provides repeatable 3.0 V trigger point with -0.075 %/°C drift, ensuring consistent reset timing across industrial temperature range. | Use Scenario: Setting constant current for indicator LEDs in portable medical devices via series Zener + resistor configuration. IC Role / Device Role / Timing Role: Acts as stable voltage drop element to fix voltage across current-setting resistor. Use Value: Maintains LED current stability within ±5% despite supply variation, leveraging 3.0 V regulation and low ZZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, ±5%, 1.0 W power rating, DO-41 package | Higher power handling but larger footprint; less suitable for space-constrained PCBs | Select when >500 mW dissipation or higher surge immunity is required |
| BZX55C3V0 | 3.0 V nominal, ±5%, 500 mW, DO-35 package, 30 Ω ZZ | Nearly identical electrical specs; different manufacturer marking and minor TC variation (-0.07 %/°C) | Drop-in alternative with same form, fit, and function in legacy DO-35 layouts |
Compared with 1N4728A and BZX55C3V0, the 1N5225B_T50R offers optimal balance of DO-35 footprint compatibility, 3.0 V regulation accuracy, and thermal stability for compact low-power designs-whereas 1N4728A trades size for power headroom, and BZX55C3V0 matches performance but originates from a different product lineage.
Availability
1N5225B_T50R is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, and low-power biasing applications requiring stable component supply and long-lifecycle support.
Supply support for 1N5225B_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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.
The 1N52xxB series belongs to ON Semiconductor's general-purpose Zener diode product line, designed specifically for cost-effective, reliable voltage regulation and clamping in consumer, industrial, and computing systems.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5225B_T50R?
The 1N5225B_T50R has a nominal Zener voltage of 3.0 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 2.85 V and 3.15 V when tested at 20 mA reverse current and 25°C ambient temperature. This specification is confirmed in the ON Semiconductor 1N5221B–1N5263B datasheet Rev. 3, page 2.
What package type and marking does the 1N5225B_T50R use?
The 1N5225B_T50R uses the DO-35 glass axial package with cathode identified by a color band. Marking consists of three lines: ON Semiconductor logo (line 1), "22" (line 2), and "5B" (line 3), per JEDEC DO-204AH and ON Semiconductor top-marking specification. The "T50R" suffix indicates 25.40 mm minimum lead spacing.
What is the maximum power dissipation and thermal derating for the 1N5225B_T50R?
The 1N5225B_T50R has a maximum power dissipation of 500 mW at 25°C ambient temperature. Above 50°C, it must be derated linearly at 4.0 mW/°C, reducing usable power to 480 mW at 55°C and 400 mW at 75°C. This ensures safe operation within the -65°C to +200°C junction temperature range.
How does the temperature coefficient affect the 1N5225B_T50R's regulation accuracy?
The 1N5225B_T50R has a temperature coefficient of -0.075 %/°C, meaning its Zener voltage decreases by approximately 2.25 mV per °C rise in junction temperature around 3.0 V. Over a 100°C change (e.g., -25°C to +75°C), this results in ~225 mV total drift-critical for precision reference designs where ambient or self-heating effects must be modeled.
Can the 1N5225B_T50R be used for both voltage regulation and overvoltage protection?
Yes, the 1N5225B_T50R functions effectively in both roles: as a shunt voltage regulator in low-current bias networks (e.g., op-amp references), and as an overvoltage clamp protecting downstream ICs by conducting excess current when reverse voltage exceeds ~3.0 V. Its 50 μA leakage at 2.4 V and 29 Ω dynamic impedance support reliable dual-mode operation.
1N5225B_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 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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
1N5225B_T50R FAQ
1.How can I place an order for 1N5225B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5225B_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 1N5225B_T50R reliable?
The price and inventory of 1N5225B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5225B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5225B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5225B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5225B_T50R?
1N5225B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5225B_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 1N5225B_T50R?
For technical support, including 1N5225B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5225B_T50R requirements.
6.How does Aetrix verify that 1N5225B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5225B_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 1N5225B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5225B_T50R?
All 1N5225B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5225B_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 1N5225B_T50R part is unused and in its original packaging.
Return procedure for 1N5225B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5225B_T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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