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onsemi 1N5246B_T50R
- Part No.:
- 1N5246B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5246B_T50R.pdf
- Description:
- DIODE ZENER 16V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,834
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Product details
Overview
1N5246B_T50R from ON Semiconductor is a 16 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 17 Ω dynamic impedance at 20 mA test current and 0.1 μA maximum reverse leakage at 12.8 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5246B_T50R datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, DO-35 mechanical dimensions, and validated alternative parts for design-in continuity and supply chain resilience.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in a planar-diffused silicon junction. Its 16 V nominal Zener voltage is specified at IZ = 20 mA with tight 5% tolerance and temperature coefficient of +0.083 %/°C, enabling stable regulation across industrial temperature ranges (–65°C to +200°C).
The DO-35 hermetically sealed glass package ensures long-term parameter stability and low leakage performance. Thermal derating begins at 50°C (4.0 mW/°C), and forward voltage is ≤1.2 V at 200 mA - supporting bidirectional transient suppression when used with series resistors or in clamping configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16 V nominal, min 15.2 V / max 16.8 V at IZ = 20 mA - defines regulated output level in shunt reference designs |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous power handling before thermal shutdown or degradation |
| Dynamic Impedance (ZZ) | 17 Ω at IZ = 20 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | ≤0.1 μA at VR = 12.8 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Temperature Coefficient (TC) | +0.083 %/°C - quantifies VZ drift per degree Celsius, critical for temperature-stable references |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - enables use in bidirectional ESD/clamp circuits with predictable turn-on |
| Package | DO-35 glass case with cathode band - standardized through-hole footprint compatible with JEDEC DO-204AH |
Pinout & Package
DO-35 glass axial package: hermetically sealed, 0.533 mm diameter body, 4.56 mm length, 1.91 mm lead diameter, cathode identified by single color band. Weight: 0.137 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential node in Zener regulator; must be referenced to ground or common rail |
| Cathode | Current exit terminal during reverse breakdown | Marked with color band; connected to higher-potential node to establish regulated voltage at cathode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct replacement without recalibration in fixed-voltage reference circuits |
| Low dynamic impedance (17 Ω) | Minimizes output voltage deviation under ±5 mA load variation in feedback or bias networks |
| Hermetic DO-35 glass package | Guarantees long-term parameter stability and moisture resistance in harsh environments |
| Industrial temperature range (–65°C to +200°C) | Supports operation in automotive engine compartments, industrial controls, and aerospace subsystems |
| 0.1 μA max reverse leakage at 12.8 V | Reduces error in high-impedance voltage divider or op-amp reference inputs |
Applications
| Power Supply Regulation | Overvoltage Protection |
|---|---|
|
Use Scenario: Low-current 16 V reference in linear regulator feedback loop or microcontroller reset circuit. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 16 V threshold for comparator input or LDO error amplifier. Use Value: Maintains ±0.8 V regulation window over 0–20 mA load, minimizing reset threshold drift across temperature. |
Use Scenario: Clamping transient surges on 15 V logic rails or sensor supply lines. IC Role / Device Role / Timing Role: Bidirectional voltage limiter absorbing positive transients at cathode and negative spikes at anode. Use Value: Limits peak voltage to ≤16.8 V while drawing <1 μA at 12.8 V, preserving signal integrity without loading source. |
| Instrumentation Reference | ADC/DAC Bias Network |
|
Use Scenario: Precision voltage reference for 12-bit analog front-end in portable multimeters. IC Role / Device Role / Timing Role: Stable DC reference node for op-amp gain-setting resistors and offset calibration. Use Value: TC of +0.083 %/°C yields only ±14 mV drift over –40°C to +85°C ambient, meeting Class II accuracy. |
Use Scenario: Biasing mid-scale reference for 16-bit SAR ADC in data acquisition modules. IC Role / Device Role / Timing Role: Low-leakage shunt element establishing precise 16 V reference point for resistor ladder networks. Use Value: 0.1 μA leakage introduces <0.1 LSB error in 1 MΩ input impedance networks, preserving ENOB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 14 V nominal, 1 W power rating, 20 Ω ZZ, DO-41 package | Higher power handling but looser 5% tolerance and larger footprint | Select when >500 mW surge energy absorption is required and board space allows DO-41 |
| BZX55C16 | 16 V nominal, 500 mW, 25 Ω ZZ, DO-35, ±5% tolerance, same TC | Identical regulation target but higher dynamic impedance increases load regulation error | Use where legacy BOM compatibility exists and 17 Ω vs. 25 Ω ZZ impact is acceptable |
Compared with 1N5246B_T50R, the 1N4744A offers higher power margin but requires PCB layout change due to DO-41 size, while the BZX55C16 matches voltage and package but degrades load regulation by ~47% due to higher ZZ.
Availability
1N5246B_T50R is available at Aetrix Electronics and suitable for power supply regulation, overvoltage protection, instrumentation reference, and ADC/DAC bias network applications requiring stable component supply and long-term parametric consistency.
Supply support for 1N5246B_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 power management, analog, sensors, and discrete devices for automotive, industrial, and cloud infrastructure 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, space-constrained applications.
FAQ
What is the exact Zener voltage range for 1N5246B_T50R at 20 mA test current?
The 1N5246B_T50R has a guaranteed Zener voltage range of 15.2 V (minimum) to 16.8 V (maximum) when measured at IZ = 20 mA and TA = 25°C. This 5% tolerance band is confirmed in the ON Semiconductor 1N5221B–1N5263B datasheet Rev. 3, Table "Electrical Characteristics" for device 1N5246B. The typical value is 16 V.
Does 1N5246B_T50R have a specified forward voltage, and what is its maximum value?
Yes, the 1N5246B_T50R specifies a maximum forward voltage of 1.2 V at IF = 200 mA, as stated in the "Electrical Characteristics" table footnote on page 2 of the ON Semiconductor datasheet. This parameter supports bidirectional clamp design and ensures predictable turn-on behavior in ESD protection circuits.
What is the thermal derating behavior of 1N5246B_T50R above 50°C ambient?
The 1N5246B_T50R derates linearly at 4.0 mW/°C above 50°C ambient temperature, reducing its maximum allowable power dissipation from 500 mW at 25°C to zero at approximately 175°C. This derating curve is defined in the "Absolute Maximum Ratings" table and applies to continuous DC operation in free-air conditions.
How is the cathode identified on the 1N5246B_T50R DO-35 package?
The cathode of the 1N5246B_T50R is marked by a single color band on the DO-35 glass body, consistent with industry-standard polarity marking for axial-leaded Zener diodes. This band aligns with the cathode terminal described in the "Top Mark Information" section and the mechanical drawing on page 4 of the ON Semiconductor datasheet.
What is the maximum reverse leakage current for 1N5246B_T50R, and at what voltage is it specified?
The maximum reverse leakage current for 1N5246B_T50R is 0.1 μA, specified at VR = 12.8 V (80% of nominal VZ). This value is listed in the "Electrical Characteristics" table under the IR column for device 1N5246B and reflects worst-case leakage under sub-breakdown conditions relevant to high-impedance bias networks.
1N5246B_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):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 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
1N5246B_T50R FAQ
1.How can I place an order for 1N5246B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5246B_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 1N5246B_T50R reliable?
The price and inventory of 1N5246B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5246B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5246B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5246B_T50R transactions.
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4.How is shipping managed for 1N5246B_T50R?
1N5246B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5246B_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 1N5246B_T50R?
For technical support, including 1N5246B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5246B_T50R requirements.
6.How does Aetrix verify that 1N5246B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5246B_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 1N5246B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5246B_T50R?
All 1N5246B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5246B_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 1N5246B_T50R part is unused and in its original packaging.
Return procedure for 1N5246B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5246B_T50R Tags
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