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onsemi 1N5242B_T50R
- Part No.:
- 1N5242B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5242B_T50R.pdf
- Description:
- DIODE ZENER 12V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,512
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Product details
Overview
1N5242B_T50R from ON Semiconductor is a 12 V ±5% silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation, 20 mA test current, and 30 Ω dynamic impedance at 20 mA - used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the 1N5242B_T50R datasheet, pinout, applications, or equivalent options, this page delivers verified Zener voltage tolerance, thermal coefficient, leakage current at rated reverse voltage, junction temperature range, and cathode identification per JEDEC DO-35 marking convention.
Technical Context
This device operates as a two-terminal voltage-reference component where reverse-biased breakdown provides stable DC voltage under controlled current. Its Zener voltage is specified at 20 mA (IZ), with 30 Ω dynamic impedance (ZZ) confirming tight regulation across load variations.
The 1N5242B_T50R exhibits a positive temperature coefficient of +0.077 %/°C and maximum 1.0 μA reverse leakage (IR) at 9.1 V (VR = 0.75 × VZ), enabling predictable drift compensation in temperature-sensitive references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V to 12.6 V at IZ = 20 mA - defines regulated output voltage window for biasing or reference use |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous power handling before thermal derating applies |
| Dynamic Impedance (ZZ) | 30 Ω at IZ = 20 mA - indicates small-signal AC resistance affecting regulation stability under varying load |
| Reverse Leakage (IR) | ≤1.0 μA at VR = 9.1 V - ensures minimal current draw in standby or high-impedance sensing nodes |
| Temperature Coefficient (TC) | +0.077 %/°C - quantifies VZ drift per degree Celsius for thermal error budgeting in precision designs |
| Junction Temperature Range | −65°C to +200°C - supports operation in extended industrial and automotive under-hood environments |
Pinout & Package
DO-35 hermetically sealed glass package (JEDEC DO-204AH), 2.0 mm diameter × 4.56 mm length, cathode identified by single color band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node when used in reverse-bias regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to supply rail or reference point; marked by axial color band per JEDEC standard |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables consistent voltage reference without post-production trimming in cost-sensitive applications |
| Low 1.0 μA max IR at 9.1 V | Minimizes quiescent current loss in battery-powered or high-impedance feedback paths |
| DO-35 glass package with cathode band | Provides visual polarity identification and hermetic reliability for long-term stability |
| 200°C max operating junction temperature | Supports placement near heat sources in compact PCB layouts without derating concerns |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 12 V reference for linear regulator feedback or ADC reference buffer. IC Role / Device Role / Timing Role: Voltage reference element establishing precise DC bias point. Use Value: Delivers 12 V ±5% with <30 Ω dynamic impedance, minimizing output variation across line/load changes. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 12 V. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess current during ESD or surge events. Use Value: Activates at 11.4–12.6 V with fast response, limiting voltage excursion while dissipating up to 500 mW peak. |
| Sensor Biasing Circuit | Current Source Stabilizer |
Use Scenario: Biasing bridge-based pressure or temperature sensors requiring stable excitation voltage. IC Role / Device Role / Timing Role: Precision DC voltage source for sensor excitation. Use Value: Maintains 12 V regulation within ±5% and +0.077 %/°C TC, reducing measurement drift over temperature. |
Use Scenario: Setting fixed current through LED or phototransistor using constant-voltage drop across series resistor. IC Role / Device Role / Timing Role: Stable voltage node defining current magnitude via Ohm's Law. Use Value: Enables accurate current setting with <1 μA leakage, preserving accuracy in low-current (<1 mA) sensing paths. |
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, ±5%, 1 W PD, DO-41 package, 22 Ω ZZ @ 25 mA | Higher power rating and larger footprint; suited for higher-current regulation | Select when >500 mW dissipation or PCB space allows DO-41 |
| BZX55C12 | 12 V nominal, ±5%, 500 mW PD, DO-35 package, 30 Ω ZZ @ 5 mA | Lower test current (5 mA vs. 20 mA); slightly higher ZZ at same IZ | Acceptable for low-current biasing where 20 mA test condition isn't required |
Compared with 1N5242B_T50R, the 1N4742A offers higher power margin but requires layout change to DO-41, while BZX55C12 matches package and tolerance but shifts test conditions - both serve as functional alternatives only when design constraints align with their specific ratings.
Availability
1N5242B_T50R is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and sensor biasing applications requiring stable component supply and JEDEC-standard DO-35 compatibility.
Supply support for 1N5242B_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 is part of ON Semiconductor's legacy Zener diode portfolio designed for general-purpose voltage regulation and reference in cost-sensitive, low-power analog circuits.
FAQ
What is the Zener voltage range for 1N5242B_T50R?
The 1N5242B_T50R has a guaranteed Zener voltage range of 11.4 V to 12.6 V at 20 mA test current (IZ), corresponding to its 12 V nominal rating with ±5% tolerance as specified in the ON Semiconductor datasheet Rev. 3.
Does 1N5242B_T50R have a defined cathode marking?
Yes, the 1N5242B_T50R uses a single axial color band on the DO-35 glass body to denote the cathode terminal, consistent with JEDEC DO-204AH standard and confirmed in the ON Semiconductor top-marking diagram.
What is the maximum reverse leakage current for 1N5242B_T50R?
The 1N5242B_T50R specifies a maximum reverse leakage current (IR) of 1.0 μA at VR = 9.1 V (0.75 × VZ), measured at TA = 25°C - a key parameter for low-power and high-impedance circuit design.
Can 1N5242B_T50R be used in surface-mount assemblies?
No, the 1N5242B_T50R is packaged in through-hole DO-35 glass and is not suitable for SMT reflow; it requires axial lead insertion and wave or hand soldering - no SMD variant exists for this exact part number.
What is the thermal derating behavior of 1N5242B_T50R above 50°C?
The 1N5242B_T50R derates linearly at 4.0 mW/°C above 50°C ambient, reducing its usable power dissipation from 500 mW at 25°C to zero at approximately 175°C case temperature - critical for thermal design validation.
1N5242B_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):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.1 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
1N5242B_T50R FAQ
1.How can I place an order for 1N5242B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5242B_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 1N5242B_T50R reliable?
The price and inventory of 1N5242B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5242B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5242B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5242B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5242B_T50R?
1N5242B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5242B_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 1N5242B_T50R?
For technical support, including 1N5242B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5242B_T50R requirements.
6.How does Aetrix verify that 1N5242B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5242B_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 1N5242B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5242B_T50R?
All 1N5242B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5242B_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 1N5242B_T50R part is unused and in its original packaging.
Return procedure for 1N5242B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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