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onsemi 1N5259B
- Part No.:
- 1N5259B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5259B.pdf
- Description:
- DIODE ZENER 39V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,917
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Product details
Overview
1N5259B from ON Semiconductor is a 39 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 80 Ω dynamic impedance at 12 mA test current and 0.25 μA reverse leakage at 30.4 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5259B datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, and direct alternatives for voltage reference design, power supply feedback, and signal clamping.
Technical Context
The 1N5259B operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 39 V, optimized for stable DC voltage reference generation under low-current conditions (IZ = 12 mA). Its temperature coefficient of +0.094 %/°C indicates positive drift, requiring compensation in high-stability applications.
Designed for operation within -65°C to +200°C junction temperature range, it features hermetically sealed DO-35 glass packaging with axial leads, cathode band marking, and 0.137 g mass. Thermal derating begins above 50°C at 4.0 mW/°C, limiting usable power in elevated ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.05 V min / 39 V typ / 40.95 V max at IZ = 12 mA - defines regulated output voltage tolerance band for reference design |
| Dynamic Impedance (ZZ) | 80 Ω max at IZ = 12 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | 0.25 μA max at VR = 30.4 V - ensures minimal quiescent current in standby regulation circuits |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power handling before thermal shutdown |
| Temperature Coefficient | +0.094 %/°C - quantifies VZ drift per degree Celsius rise, critical for temp-compensated references |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - specifies conduction drop when used in series clamping or polarity protection |
Pinout & Package
DO-35 glass axial-leaded package: hermetically sealed, cathode identified by color band, 0.137 g mass, JEDEC DO-204AH compliant, 4.56 mm body length, 1.91 mm diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher-potential node during regulation; sinks Zener current to ground or return path |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage reference | ±5% tolerance at 39 V enables accurate feedback in linear regulators and ADC references |
| Low leakage performance | 0.25 μA max reverse current minimizes error in high-impedance bias networks |
| Stable temperature coefficient | +0.094 %/°C allows predictable drift modeling in industrial temperature ranges |
| Robust glass encapsulation | Hermetic DO-35 seal ensures long-term reliability in humid or corrosive environments |
Applications
| Voltage Reference for Analog Sensors | Overvoltage Clamp in Signal Conditioning |
|---|---|
Use Scenario: Providing stable excitation voltage to bridge-based pressure sensors in automotive engine control units. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed 39 V reference for sensor biasing. Use Value: Maintains <±0.5% output stability across -40°C to +125°C ambient with minimal drift-induced offset error. | Use Scenario: Protecting op-amp inputs from transient surges in industrial process monitoring front-ends. IC Role / Device Role / Timing Role: Shunt clamp limiting input voltage to 39 V during ESD or lightning-induced spikes. Use Value: Absorbs up to 500 mW surge energy without degradation, preserving downstream amplifier integrity. |
| Feedback Regulation in Linear Power Supplies | Reference Source for Precision DACs |
Use Scenario: Setting output voltage in discrete transistor-based 3.3 V LDO using resistor divider and pass transistor. IC Role / Device Role / Timing Role: Zener element in feedback network defining regulated output via voltage division ratio. Use Value: Enables ±1% output accuracy with 80 Ω ZZ contributing <0.1% error at 10 mA load step. | Use Scenario: Supplying reference voltage to 16-bit DACs in test equipment requiring sub-LSB stability. IC Role / Device Role / Timing Role: Low-noise, low-drift DC reference source driving DAC reference input pin. Use Value: Delivers <10 ppm/°C effective TC when combined with passive compensation resistors. |
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 |
|---|---|---|---|
| BZX55-C39 | Same 39 V nominal, ±5% tolerance, but 500 mW rating with 90 Ω ZZ at 5 mA; DO-35 package | Slightly higher dynamic impedance and different test current reduce regulation precision in low-noise references | Select when legacy BOM compatibility or distributor stock availability outweighs 1N5259B's tighter ZZ spec |
| 1N4739A | 39 V nominal, ±5%, 1 W power rating, 9 Ω ZZ at 31 mA; DO-41 package, larger footprint | Higher power and lower impedance suit higher-current regulation but require PCB layout change | Choose for designs needing >500 mW headroom or improved load regulation at >20 mA currents |
Compared with BZX55-C39 and 1N4739A, the 1N5259B offers optimal balance of tight ZZ, low leakage, and DO-35 form factor for space-constrained, low-power reference designs where 500 mW suffices and 12 mA test current aligns with typical bias networks.
Availability
1N5259B is available at Aetrix Electronics and suitable for voltage reference design, analog sensor excitation, and overvoltage protection circuits requiring stable component supply and long-lifecycle support.
Supply support for 1N5259B 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 general-purpose Zener diode product line, engineered for cost-effective, reliable voltage regulation and clamping in low-to-medium power analog systems.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5259B?
The 1N5259B has a nominal Zener voltage of 39 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 37.05 V and 40.95 V when tested at 12 mA Zener current and 25°C ambient temperature. This tolerance band is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3.
What is the maximum power dissipation and thermal derating behavior of the 1N5259B?
The 1N5259B is rated for 500 mW power dissipation at 25°C ambient temperature. Above 50°C, it must be derated linearly at 4.0 mW/°C - for example, at 75°C ambient, maximum allowable power drops to 400 mW. This derating ensures safe junction temperature operation within the -65°C to +200°C specified range.
How is the cathode identified on the 1N5259B DO-35 package?
The cathode of the 1N5259B is marked by a distinct color band (typically black or dark stripe) located near one end of the DO-35 glass body. This band identifies the cathode terminal, which must be connected to the higher-potential side of the circuit when the device is used in reverse-biased Zener regulation mode.
What is the reverse leakage current specification for the 1N5259B?
The 1N5259B exhibits a maximum reverse leakage current (IR) of 0.25 μA when subjected to a reverse voltage (VR) of 30.4 V at 25°C. This ultra-low leakage supports high-impedance reference networks and minimizes error in precision analog circuits where bias current must be tightly controlled.
Does the 1N5259B have a specified forward voltage, and what is its value?
Yes, the 1N5259B specifies a maximum forward voltage (VF) of 1.2 V at a forward current (IF) of 200 mA. This parameter is relevant when the device is used in forward conduction - for example, in polarity protection or series clamping configurations - and confirms robust low-voltage switching capability.
1N5259B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 30 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
1N5259B FAQ
1.How can I place an order for 1N5259B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5259B 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 1N5259B reliable?
The price and inventory of 1N5259B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5259B is usually 5 days.
3.What payment methods are accepted for 1N5259B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5259B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5259B?
1N5259B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5259B 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 1N5259B?
For technical support, including 1N5259B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5259B requirements.
6.How does Aetrix verify that 1N5259B is sourced from the original manufacturer or authorized distributors?
All 1N5259B 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 1N5259B meets industry standards.
7.What is the process for return or replacement of 1N5259B?
All 1N5259B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5259B, 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 1N5259B part is unused and in its original packaging.
Return procedure for 1N5259B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5259B Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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