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onsemi 1N5246B_T50A
- Part No.:
- 1N5246B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5246B_T50A.pdf
- Description:
- DIODE ZENER 16V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,915
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Product details
Overview
1N5246B_T50A from ON Semiconductor is a 16 V, ±5% tolerance, 500 mW glass-encapsulated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection. It features 17 Ω dynamic impedance at 20 mA, 0.25 μA maximum reverse leakage at 12.8 V, and a temperature coefficient of +0.083 %/°C.
For engineers reviewing the 1N5246B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal stability in compact PCB layouts, low leakage under standby bias, and compatibility with through-hole reflow or hand-soldering processes in industrial and consumer power management designs.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown characteristics, optimized for stable DC voltage reference generation in linear regulators and sensing circuits. Its DO-35 hermetically sealed glass package ensures long-term parameter stability and low moisture ingress risk.
The 1N5246B_T50A exhibits a positive temperature coefficient (+0.083 %/°C), indicating increasing Zener voltage with rising junction temperature - a critical factor when designing temperature-compensated references or evaluating thermal drift in battery-powered systems operating across -65°C to +200°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.0 V nominal, min 15.2 V / max 16.8 V at IZ = 20 mA - defines regulated output voltage under standard test conditions |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance (ZZ) | 17 Ω at IZ = 20 mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Leakage (IR) | ≤0.1 μA at VR = 12.8 V - ensures minimal quiescent current draw in high-impedance bias networks |
| Temperature Coefficient (TC) | +0.083 %/°C - quantifies voltage drift per degree Celsius rise, critical for ambient-temperature-sensitive references |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - supports use as a low-drop rectifier or clamp in dual-polarity protection schemes |
Pinout & Package
DO-35 glass axial package: hermetically sealed, 2.0 mm diameter × 4.56 mm body length, cathode indicated by color band. Weight: 0.137 g. JEDEC DO-204AH compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower potential node; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 16 V reference when reverse biased; marked by visible color band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tight regulation without external trimming in cost-sensitive voltage reference designs |
| Hermetic glass DO-35 package | Guarantees long-term parametric stability and resistance to humidity-induced degradation in harsh environments |
| Low 0.1 μA reverse leakage at 12.8 V | Minimizes standby power loss in battery-backed circuits and high-impedance sensor biasing networks |
| +0.083 %/°C temperature coefficient | Supports predictable thermal drift modeling for compensation in precision analog front-ends |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in discrete linear power supplies using TL431 or op-amp error amplifiers. IC Role / Device Role / Timing Role: Provides precise 16 V reference for comparator threshold or error amplifier feedback divider. Use Value: Enables ±1% output regulation accuracy with minimal external components and no calibration required. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 16 V. IC Role / Device Role / Timing Role: Acts as shunt clamping element to divert excess current during ESD or load-dump surges. Use Value: Limits pin voltage to safe 16 V level while maintaining <0.1 μA leakage during normal operation. |
| Voltage Reference Source | Current Source Bias |
Use Scenario: Generating stable bias for analog sensor signal conditioning circuits in industrial transmitters. IC Role / Device Role / Timing Role: Supplies fixed 16 V reference to op-amp bias networks and ADC reference dividers. Use Value: Delivers <10 ppm/°C effective drift after accounting for TC and layout thermal gradients. |
Use Scenario: Setting constant current for LED drivers or transistor biasing via series resistor + Zener configuration. IC Role / Device Role / Timing Role: Maintains stable voltage drop across current-setting resistor to define IOUT. Use Value: Achieves ±3% current accuracy over -40°C to +85°C ambient with no active components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 14 V nominal, 1 W rating, DO-41 package, 20 Ω ZZ, -0.05 %/°C TC | Higher power handling but lower voltage and opposite TC sign; less suitable for 16 V precision references | Select when higher power dissipation (>500 mW) or TO-226AA footprint compatibility is required |
| BZX55C16 | 16 V nominal, ±5%, 500 mW, DO-35, 20 Ω ZZ, +0.08 %/°C TC, tighter IR spec (≤0.1 μA @ 12.8 V) | Nearly identical electrical specs; differs in marking format and minor process variations per manufacturer | Drop-in alternative with same form, fit, and function; preferred for new designs requiring RoHS-compliant sourcing |
Compared with 1N4744A and BZX55C16, the 1N5246B_T50A offers optimal balance of 16 V accuracy, low leakage, and proven thermal stability in space-constrained DO-35 layouts - making it preferred for legacy-compatible, low-power reference designs where exact 16 V regulation is mandatory.
Availability
1N5246B_T50A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, medical instrumentation, and consumer electronics requiring stable component supply and long-term obsolescence management.
Supply support for 1N5246B_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 management, analog, sensors, and logic solutions for automotive, industrial, cloud computing, and IoT applications.
The 1N52xxB series is part of ON Semiconductor's legacy Zener diode portfolio, engineered for reliable voltage reference and regulation in cost-sensitive, high-volume applications demanding long-term parametric consistency and JEDEC-standard packaging.
FAQ
What is the Zener voltage tolerance of the 1N5246B_T50A?
The 1N5246B_T50A has a guaranteed Zener voltage tolerance of ±5% at 20 mA test current, meaning its actual breakdown voltage falls between 15.2 V and 16.8 V under standard conditions. This tolerance is specified per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3 and applies to all units shipped under this orderable part number.
Does the 1N5246B_T50A have a cathode marking, and how is it identified?
Yes, the 1N5246B_T50A uses a visible color band on the glass DO-35 body to denote the cathode terminal. Per ON Semiconductor's package specification, this band is located near one end of the device and must be oriented toward the higher-potential node in reverse-bias applications. The anode is the unmarked end.
What is the maximum reverse leakage current for the 1N5246B_T50A, and at what voltage is it measured?
The 1N5246B_T50A specifies a maximum reverse leakage current (IR) of 0.1 μA at a reverse voltage (VR) of 12.8 V, measured at TA = 25°C. This low leakage supports energy-efficient operation in always-on circuits and high-impedance reference networks.
Can the 1N5246B_T50A be used in surface-mount designs?
No - the 1N5246B_T50A is manufactured exclusively in the axial-leaded DO-35 glass package and is not compatible with SMT reflow profiles or pick-and-place equipment. For surface-mount equivalents, consider ON Semiconductor's NSZ5246B (SOD-123) or BZX84-C16 (SOT-23), which differ in package, thermal performance, and test conditions.
What is the thermal derating behavior of the 1N5246B_T50A above 50°C ambient?
The 1N5246B_T50A derates linearly at 4.0 mW/°C above 50°C ambient temperature. At 75°C ambient, its usable power dissipation drops to 400 mW (500 mW − [25°C × 4.0 mW/°C]), requiring careful thermal design in enclosed or high-temperature environments to avoid exceeding junction temperature limits.
1N5246B_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):
- 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_T50A FAQ
1.How can I place an order for 1N5246B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5246B_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 1N5246B_T50A reliable?
The price and inventory of 1N5246B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5246B_T50A is usually 5 days.
3.What payment methods are accepted for 1N5246B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5246B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5246B_T50A?
1N5246B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5246B_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 1N5246B_T50A?
For technical support, including 1N5246B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5246B_T50A requirements.
6.How does Aetrix verify that 1N5246B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N5246B_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 1N5246B_T50A meets industry standards.
7.What is the process for return or replacement of 1N5246B_T50A?
All 1N5246B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5246B_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 1N5246B_T50A part is unused and in its original packaging.
Return procedure for 1N5246B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5246B_T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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