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onsemi 1N5242B_S00Z
- Part No.:
- 1N5242B_S00Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5242B_S00Z.pdf
- Description:
- DIODE ZENER 12V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,450
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Product details
Overview
1N5242B_S00Z from ON Semiconductor is a 5% tolerance, 12 V 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 ±0.077 %/°C temperature coefficient - used for precision voltage reference and low-power regulation in analog sensor signal conditioning circuits.
For engineers reviewing the 1N5242B_S00Z datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode identification, and direct-fit alternatives for board-level voltage stabilization design.
Technical Context
This device operates as a two-terminal silicon Zener diode with reverse-biased breakdown regulation. Its 12 V nominal Zener voltage (min 11.4 V, typ 12 V, max 12.6 V) is specified at IZ = 20 mA with 30 Ω Zener impedance (ZZ) and 1.0 μA maximum reverse leakage (IR) at 9.1 V.
The DO-35 hermetically sealed glass package features axial leads, cathode band marking, and supports junction temperatures from –65°C to +200°C. Thermal derating begins above 50°C at 4.0 mW/°C, limiting usable power in high-ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V min / 12 V typ / 12.6 V max at IZ = 20 mA - defines stable regulation range under nominal bias. |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power before thermal shutdown risk. |
| Zener Impedance (ZZ) | 30 Ω at IZ = 20 mA - indicates regulation stiffness; lower values improve line/load regulation accuracy. |
| Temperature Coefficient (TC) | ±0.077 %/°C - quantifies VZ drift per degree; enables prediction of output shift over operating temperature. |
| Reverse Leakage (IR) | 1.0 μA max at VR = 9.1 V - confirms low standby current in undervoltage protection or reference divider paths. |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - ensures predictable conduction if accidentally forward-biased during transient events. |
Pinout & Package
DO-35 glass axial-leaded package with cathode identified by a single color band on the body. Leads are tinned copper-clad steel, 0.533 mm diameter, 3.05 mm length minimum. Hermetic seal ensures long-term stability and moisture resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower-potential rail; forms return path for Zener current. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage source via current-limiting resistor; supplies stable 12 V to load when reverse-biased. |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables use in cost-sensitive designs where ±5% output accuracy is acceptable without trimming. |
| Hermetically sealed DO-35 glass package | Provides long-term parameter stability and immunity to humidity-induced degradation in industrial environments. |
| –65°C to +200°C operating junction range | Supports deployment in automotive engine compartments, industrial motor controls, and aerospace subsystems. |
| Low 1.0 μA reverse leakage at 9.1 V | Minimizes quiescent current draw in battery-powered voltage monitor circuits and low-power references. |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Monitoring |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs measuring thermocouple or strain gauge outputs in PLC modules. IC Role / Device Role / Timing Role: Zener diode providing fixed 12 V reference to op-amp bias networks and ADC reference inputs. Use Value: Maintains <±0.1% reference drift across –40°C to +85°C ambient due to low TC and stable glass package. |
Use Scenario: Clamping and validating VBUS voltage thresholds during USB-C PD negotiation sequences. IC Role / Device Role / Timing Role: Overvoltage clamp protecting PD controller GPIOs and enabling fast fault detection at 12 V threshold. Use Value: Responds within nanoseconds to transients while drawing only 1.0 μA standby current below trip point. |
| Automotive Cabin Control Panel | IoT Edge Node Power Sequencing |
|
Use Scenario: Generating local 12 V rail for microcontroller reset supervisor ICs in HVAC control units. IC Role / Device Role / Timing Role: Zener-based shunt regulator supplying clean 12 V to voltage detector ICs during cold-crank conditions. Use Value: Operates reliably down to –40°C with no startup delay, supporting ASIL-B functional safety requirements. |
Use Scenario: Enabling controlled power-up sequencing of RF SoC and flash memory in LPWA sensor nodes. IC Role / Device Role / Timing Role: Voltage threshold detector triggering enable signals when input exceeds 12 V after LDO startup. Use Value: Delivers precise 12 V trip point with 30 Ω ZZ ensuring minimal hysteresis and repeatable timing. |
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 10% tolerance, 1 W power rating, DO-41 package. | Higher power handling suits higher-current shunt regulation; looser tolerance limits precision reference use. | Select when thermal margin >500 mW is required and ±10% VZ is acceptable. |
| BZX55C12 | 12 V, 5% tolerance, 500 mW, DO-35 package, but 100 Ω ZZ at 5 mA and ±0.07 %/°C TC. | Higher impedance reduces regulation accuracy under load variation; tighter TC improves temperature stability. | Select when lowest possible TC is critical and load current remains <5 mA. |
Compared with 1N5242B_S00Z, the 1N4742A offers higher power but reduced voltage precision, while the BZX55C12 trades lower Zener impedance for marginally better temperature stability - making 1N5242B_S00Z optimal for mid-accuracy, mid-current 12 V reference designs requiring DO-35 form factor.
Availability
1N5242B_S00Z is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power monitoring, automotive cabin electronics, and IoT edge node power sequencing requiring stable component supply and long-lifecycle support.
Supply support for 1N5242B_S00Z 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 belongs to ON Semiconductor's legacy Zener diode product line designed for general-purpose voltage regulation and reference applications in cost-sensitive, space-constrained PCB layouts.
FAQ
What is the Zener voltage tolerance of the 1N5242B_S00Z?
The 1N5242B_S00Z has a guaranteed ±5% Zener voltage tolerance, meaning its breakdown voltage falls between 11.4 V and 12.6 V when tested at 20 mA. This tolerance is confirmed in the ON Semiconductor datasheet Rev. 3 (December 2018) and applies across the full operating temperature range.
Does the 1N5242B_S00Z have a cathode marking, and how is it identified?
Yes, the 1N5242B_S00Z uses a DO-35 glass package with a single color band on the body denoting the cathode terminal. This marking is standardized per JEDEC DO-204AH and visible on both ends of the axial leaded device - essential for correct orientation during hand-soldering or automated placement.
What is the maximum power dissipation for the 1N5242B_S00Z at 75°C ambient?
At 75°C ambient, the 1N5242B_S00Z must be derated from its 500 mW rating at 25°C. With a derating factor of 4.0 mW/°C above 50°C, power drops to 400 mW (500 mW − [25°C × 4.0 mW/°C]). This ensures safe operation without exceeding the 200°C maximum junction temperature.
Can the 1N5242B_S00Z be used in place of the 1N5242B without modification?
Yes - the suffix "_S00Z" reflects Fairchild-to-ON Semiconductor nomenclature alignment and does not indicate a functional or parametric change. The 1N5242B_S00Z is functionally identical to the original 1N5242B, sharing all electrical specs, DO-35 package dimensions, and marking layout per ON Semiconductor documentation.
What is the reverse leakage current specification for the 1N5242B_S00Z?
The 1N5242B_S00Z specifies a maximum reverse leakage current (IR) of 1.0 μA at VR = 9.1 V, measured at 25°C. This value is critical for low-power applications such as battery-backed voltage monitors, where standby current directly impacts system runtime.
1N5242B_S00Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5242B_S00Z FAQ
1.How can I place an order for 1N5242B_S00Z through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5242B_S00Z 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_S00Z reliable?
The price and inventory of 1N5242B_S00Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5242B_S00Z is usually 5 days.
3.What payment methods are accepted for 1N5242B_S00Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5242B_S00Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5242B_S00Z?
1N5242B_S00Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5242B_S00Z 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_S00Z?
For technical support, including 1N5242B_S00Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5242B_S00Z requirements.
6.How does Aetrix verify that 1N5242B_S00Z is sourced from the original manufacturer or authorized distributors?
All 1N5242B_S00Z 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_S00Z meets industry standards.
7.What is the process for return or replacement of 1N5242B_S00Z?
All 1N5242B_S00Z units undergo pre-shipment inspection (PSI). If there is an issue with 1N5242B_S00Z, 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_S00Z part is unused and in its original packaging.
Return procedure for 1N5242B_S00Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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