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onsemi 1N5251B_T50A
- Part No.:
- 1N5251B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5251B_T50A.pdf
- Description:
- DIODE ZENER 22V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,736
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Product details
Overview
1N5251B_T50A from ON Semiconductor is a 22 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 0.25 μA maximum reverse leakage at 17 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5251B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, temperature coefficient (+0.087 %/°C), thermal derating (4.0 mW/°C above 50°C), and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon. Its 22 V nominal Zener voltage is specified at IZ = 20 mA with ±5% tolerance and measured at 30°C lead temperature per JEDEC standard. The 29 Ω Zener impedance reflects regulation stability under load variation.
The DO-35 hermetically sealed glass package ensures long-term parameter stability and low leakage (≤0.25 μA at 17 V). Thermal performance is defined by junction-to-ambient thermal resistance derived from 4.0 mW/°C derating above 50°C and TJ range of −65°C to +200°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V nominal, min 20.9 V / max 23.1 V at IZ = 20 mA - defines stable regulation point for biasing or clamping |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power handling before thermal shutdown |
| Zener Impedance (ZZ) | 29 Ω at IZ = 20 mA - indicates voltage deviation per mA change in current; lower = tighter regulation |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 17 V - ensures minimal quiescent current in standby or high-impedance sensing nodes |
| Temperature Coefficient | +0.087 %/°C - quantifies VZ drift with ambient temperature; enables compensation in precision references |
| Package | DO-35 glass case with cathode band - standardized through-hole footprint compatible with legacy assembly processes |
Pinout & Package
DO-35 glass axial package: hermetically sealed, 0.533 mm diameter body, 4.56 mm length, cathode indicated by color band. Weight: 0.137 g. Compliant with JEDEC DO-204AH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during forward bias; used for polarity identification and circuit orientation |
| Cathode | Zener breakdown terminal | Connected to higher-potential node during regulation; marked by color band; determines voltage reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable clamping within 1.1 V window at 22 V, suitable for non-critical reference designs without trimming |
| Low reverse leakage (≤0.25 μA) | Minimizes error current in high-impedance voltage divider networks and battery-powered sensor biasing |
| Stable temperature coefficient (+0.087 %/°C) | Supports <±22 mV/°C drift in 22 V reference - usable in industrial environments without active compensation |
| DO-35 glass package reliability | Hermetic seal prevents moisture ingress and parametric shift over time, critical for long-life instrumentation |
Applications
| Power Supply Rail Clamping | Analog Sensor Bias Reference |
|---|---|
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage on 24 V industrial control lines. IC Role / Device Role / Timing Role: Shunt regulator clamping excess energy to ground when line voltage exceeds 22 V. Use Value: Limits voltage to safe level for 3.3 V or 5 V logic inputs without requiring active circuitry or response delay. | Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in HVAC monitoring systems. IC Role / Device Role / Timing Role: Low-drift Zener reference source for ratiometric measurement circuits. Use Value: Maintains <±0.2% reference accuracy across −25°C to +70°C ambient, enabling sub-0.5°C temperature resolution. |
| Low-Power Voltage Monitor | LED Current Regulation |
Use Scenario: Detecting brown-out conditions in battery-backed real-time clocks operating from 24 V supply rails. IC Role / Device Role / Timing Role: Threshold detector via comparator input biased by 22 V Zener-stabilized reference. Use Value: Triggers reset at consistent 22 V threshold with <±0.5 V hysteresis, independent of supply ripple. | Use Scenario: Setting constant current for indicator LEDs in panel-mounted equipment with variable input voltage. IC Role / Device Role / Timing Role: Series-pass voltage reference in simple LED driver with ballast resistor. Use Value: Delivers ±3% LED brightness consistency across 18–30 V input range due to tight VZ tolerance 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 |
|---|---|---|---|
| 1N4742A | 12 V nominal, 1 W rating, DO-41 package, 22 Ω ZZ at 21 mA | Higher power, lower voltage - unsuitable for 22 V regulation but better for 12 V rail clamping | Select only if system requires ≥1 W dissipation or 12 V reference; not drop-in for 1N5251B_T50A |
| BZX55C22 | 22 V nominal, ±5%, DO-35, 500 mW, 25 Ω ZZ at 5 mA | Same voltage and package, but tested at lower IZ; ZZ measured at 5 mA vs. 20 mA | Acceptable substitute where 20 mA test condition is not required; verify regulation stability at target operating current |
Compared with 1N4742A and BZX55C22, the 1N5251B_T50A offers optimized 22 V regulation at 20 mA with industry-standard DO-35 footprint and verified 29 Ω impedance at that current - making it preferred for designs requiring precise 22 V reference behavior under typical bias conditions.
Availability
1N5251B_T50A is available at Aetrix Electronics and suitable for industrial control systems, analog sensor interfaces, power supply protection circuits, and embedded voltage reference designs requiring stable component supply and long-term parametric consistency.
Supply support for 1N5251B_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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N52xxB series is part of ON Semiconductor's legacy Zener diode portfolio designed for general-purpose voltage regulation and protection in cost-sensitive, high-reliability through-hole applications.
FAQ
What is the Zener voltage tolerance of the 1N5251B_T50A?
The 1N5251B_T50A has a Zener voltage tolerance of ±5% around its nominal 22 V rating, meaning the actual VZ falls between 20.9 V and 23.1 V when measured at IZ = 20 mA and TL = 30°C. This tolerance is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3, and applies directly to the 1N5251B_T50A device.
Does the 1N5251B_T50A have a specified forward voltage?
Yes, the 1N5251B_T50A has a maximum forward voltage (VF) of 1.2 V at IF = 200 mA, as stated in the "Electrical Characteristics" section of the ON Semiconductor datasheet. This value is relevant for polarity verification and forward-bias applications, and is consistent across the 1N5221B–1N5263B family including the 1N5251B_T50A.
What is the thermal derating behavior of the 1N5251B_T50A above 50°C?
The 1N5251B_T50A must be derated at 4.0 mW/°C above an ambient temperature of 50°C, reducing its maximum allowable power dissipation linearly. At 70°C ambient, for example, PD drops to 420 mW. This derating is specified in the Absolute Maximum Ratings table and applies identically to the 1N5251B_T50A in its DO-35 package.
Is the 1N5251B_T50A RoHS compliant?
Yes, the 1N5251B_T50A is RoHS compliant per ON Semiconductor's product compliance documentation. As part of the 1N5221B–1N5263B family manufactured after the Fairchild integration, it meets EU Directive 2011/65/EU requirements, including lead-free terminations and restricted substance limits. Compliance status is verified for the 1N5251B_T50A under ON Semiconductor's standard material declarations.
What does the "T50A" suffix indicate in 1N5251B_T50A?
The "T50A" suffix in 1N5251B_T50A denotes tape-and-reel packaging per ON Semiconductor's ordering nomenclature: "T" = tape, "50" = 50 mm tape width, "A" = standard orientation and reel size. This packaging format is distinct from bulk or ammo-pack variants and is confirmed for the 1N5251B_T50A in ON Semiconductor's official ordering information.
1N5251B_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):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 17 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
1N5251B_T50A FAQ
1.How can I place an order for 1N5251B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5251B_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 1N5251B_T50A reliable?
The price and inventory of 1N5251B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5251B_T50A is usually 5 days.
3.What payment methods are accepted for 1N5251B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5251B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5251B_T50A?
1N5251B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5251B_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 1N5251B_T50A?
For technical support, including 1N5251B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5251B_T50A requirements.
6.How does Aetrix verify that 1N5251B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N5251B_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 1N5251B_T50A meets industry standards.
7.What is the process for return or replacement of 1N5251B_T50A?
All 1N5251B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5251B_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 1N5251B_T50A part is unused and in its original packaging.
Return procedure for 1N5251B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5251B_T50A Tags
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MMBZ5240B-7-F
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