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onsemi 1N5242B_T50A
- Part No.:
- 1N5242B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5242B_T50A.pdf
- Description:
- DIODE ZENER 12V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,933
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Product details
Overview
1N5242B_T50A from ON Semiconductor is a 12 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 30 Ω dynamic impedance at 20 mA test current and 1.0 μA maximum reverse leakage at 9.1 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback loops, and sensor signal conditioning.
For engineers reviewing the 1N5242B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include its 12 V nominal Zener voltage, tight 5% tolerance, DO-35 mechanical compatibility, and thermal stability across -65°C to +200°C junction temperature range.
Technical Context
This device operates in reverse-biased breakdown mode, maintaining stable voltage regulation under controlled current conditions. Its Zener voltage is specified at IZ = 20 mA with thermal equilibrium at lead temperature of 30°C ±1°C and 3/8″ lead length - critical for repeatable bench validation.
The 1N5242B_T50A exhibits a positive temperature coefficient of +0.077 %/°C, indicating voltage increases with rising temperature - a key factor when designing temperature-compensated references or selecting complementary devices for bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal, min 11.4 V / max 12.6 V at IZ = 20 mA - defines regulated output level in shunt regulator designs |
| Power Dissipation (PD) | 500 mW at TA = 25°C, derates 4.0 mW/°C above 50°C - sets maximum continuous power handling in PCB layout |
| Dynamic Impedance (ZZ) | 30 Ω at IZ = 20 mA - determines voltage regulation sensitivity to load current changes |
| Reverse Leakage (IR) | ≤1.0 μA at VR = 9.1 V - ensures minimal quiescent current in standby or low-power modes |
| Tolerance | ±5% - enables predictable voltage margining without post-production trimming |
| Operating Junction Temp | -65°C to +200°C - supports operation in automotive under-hood, industrial control, and aerospace environments |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - allows use as low-drop rectifier or ESD protection element in bidirectional clamping |
Pinout & Package
DO-35 hermetically sealed glass package with axial leads; cathode identified by color band. Total weight: 0.137 g. Dimensions per JEDEC DO-204AH: body diameter 1.53–1.91 mm, overall length 4.56 mm minimum, lead diameter 0.46–0.533 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener regulation | Must be tied to ground or common reference in shunt regulator configuration |
| Cathode | Current exit terminal in forward bias; Zener breakdown occurs between cathode and anode | Connected to regulated voltage node; color band identifies this terminal on DO-35 body |
Key Features
| Feature | Design Value |
|---|---|
| Stable 12 V reference | Guaranteed 11.4–12.6 V range at 20 mA enables accurate feedback in 12 V SMPS designs |
| Low dynamic impedance | 30 Ω ensures <15 mV output shift per 0.5 mA load variation - suitable for precision analog sensing |
| Hermetic DO-35 glass package | Prevents moisture ingress and long-term parameter drift in humid or high-reliability environments |
| Wide operating temperature | -65°C to +200°C junction range supports deployment in engine control units and downhole instrumentation |
| 5% voltage tolerance | Eliminates need for external trimming resistors in cost-sensitive consumer and industrial power supplies |
Applications
| Industrial Power Supply Feedback | Automotive Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 12 V reference for TL431 or optocoupler LED drive. Use Value: Maintains ±1% output regulation across line/load transients due to low ZZ and tight VZ tolerance. |
Use Scenario: Clamping and biasing analog outputs from pressure or temperature sensors in engine control modules. IC Role / Device Role / Timing Role: Overvoltage protector and DC bias reference for ratiometric sensor interfaces. Use Value: Prevents ADC input damage during load dump events while contributing <0.5% error to sensor scaling accuracy. |
| Consumer Electronics Voltage Reference | Medical Diagnostic Instrumentation |
|
Use Scenario: Providing stable reference for battery charger ICs and LED driver feedback in portable devices. IC Role / Device Role / Timing Role: Precision Zener reference for current-sense amplifier bias and voltage monitor thresholds. Use Value: Enables consistent charge termination and LED brightness control across 0–40°C ambient range. |
Use Scenario: Stabilizing excitation voltage for strain-gauge bridges in patient monitoring equipment. IC Role / Device Role / Timing Role: Low-drift DC reference source for bridge excitation and analog front-end calibration. Use Value: Supports <10 ppm/°C effective TC via circuit-level compensation, meeting Class II medical accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | Same 12 V nominal rating but ±5% tolerance, 1.0 W power rating, DO-41 package | Higher power handling suits higher-current shunt regulators; larger DO-41 footprint requires PCB redesign | Select when >500 mW dissipation is needed; not drop-in due to package and thermal mass differences |
| BZX55C12 | 12 V ±5%, 500 mW, DO-35 package, but 100 Ω ZZ at 5 mA - higher impedance than 1N5242B_T50A | Lower test current (5 mA vs. 20 mA) shifts operating point; less stable under varying load conditions | Acceptable for non-critical biasing; avoid where tight regulation under dynamic loads is required |
Compared with 1N4742A and BZX55C12, the 1N5242B_T50A delivers superior regulation stability at 20 mA due to its 30 Ω ZZ, fits legacy DO-35 layouts, and balances precision with thermal robustness in compact form factors.
Availability
1N5242B_T50A is available at Aetrix Electronics and suitable for industrial power supply feedback, automotive sensor signal conditioning, and consumer electronics voltage reference requiring stable component supply and long-term parametric consistency.
Supply support for 1N5242B_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 logic solutions for automotive, industrial, cloud computing, and consumer markets.
The 1N52xxB series was designed for general-purpose precision voltage regulation in space-constrained, thermally demanding applications - emphasizing reliability, tight tolerances, and wide temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N5242B_T50A?
The 1N5242B_T50A has a guaranteed ±5% tolerance on its nominal 12 V Zener voltage, meaning the actual measured VZ falls between 11.4 V and 12.6 V when tested at IZ = 20 mA and thermal equilibrium conditions. This tolerance is confirmed in the ON Semiconductor 1N5221B–1N5263B datasheet Rev. 3, Table 2.
Does the 1N5242B_T50A have a specified temperature coefficient?
Yes, the 1N5242B_T50A has a temperature coefficient of +0.077 %/°C, indicating its Zener voltage increases with rising temperature. This value is documented in the Electrical Characteristics table of the official ON Semiconductor datasheet and is critical for predicting voltage drift in unregulated thermal environments.
What is the maximum reverse leakage current for the 1N5242B_T50A?
The 1N5242B_T50A specifies a maximum reverse leakage current (IR) of 1.0 μA at VR = 9.1 V, as verified in the ON Semiconductor 1N5221B–1N5263B datasheet. This low leakage supports energy-efficient operation in battery-powered systems where standby current must be minimized.
Can the 1N5242B_T50A be used in forward-bias applications?
Yes, the 1N5242B_T50A has a forward voltage (VF) of ≤1.2 V at IF = 200 mA, making it usable as a low-drop rectifier or ESD clamp in bidirectional protection circuits. However, its primary design intent and characterization are for reverse-bias Zener operation.
Is the 1N5242B_T50A packaged in a hermetically sealed case?
Yes, the 1N5242B_T50A uses a hermetically sealed DO-35 glass package, as stated in the ON Semiconductor datasheet notes. This construction prevents moisture ingress and ensures long-term parameter stability in harsh environments such as automotive under-hood or industrial control cabinets.
1N5242B_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):
- 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_T50A FAQ
1.How can I place an order for 1N5242B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5242B_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 1N5242B_T50A reliable?
The price and inventory of 1N5242B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5242B_T50A is usually 5 days.
3.What payment methods are accepted for 1N5242B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5242B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5242B_T50A?
1N5242B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5242B_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 1N5242B_T50A?
For technical support, including 1N5242B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5242B_T50A requirements.
6.How does Aetrix verify that 1N5242B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N5242B_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 1N5242B_T50A meets industry standards.
7.What is the process for return or replacement of 1N5242B_T50A?
All 1N5242B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5242B_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 1N5242B_T50A part is unused and in its original packaging.
Return procedure for 1N5242B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5242B_T50A Tags
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