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Microchip Technology 1N5259B
- Part No.:
- 1N5259B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5259B.pdf
- Description:
- DIODE ZENER 39V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,788
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Product details
Overview
1N5259B from Microsemi is a 39 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 3.2 mA test current, 80 Ω dynamic impedance at IZK, and operating from –65°C to +175°C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.
For engineers reviewing the 1N5259B datasheet, 1N5259B pinout, 1N5259B application, or 1N5259B equivalent, key selection factors include its 39 V nominal Zener voltage with 5% tolerance, 80 Ω Zener impedance at 0.25 mA, –65°C to +175°C operating temperature range, DO-35 mechanical compatibility, and RoHS-compliant e3 variant availability.
Technical Context
The 1N5259B operates as a silicon planar Zener diode with sharp reverse breakdown knee, characterized by guaranteed limits on VZ, IR, VF, ZZT, ZZK, and αVZ. Its regulation stability relies on a 3.2 mA test current and exhibits a +0.094 %/°C temperature coefficient over 25°C–125°C.
Designed for axial-lead through-hole mounting, it delivers stable regulation across wide current ranges (0.25 mA to 3.2 mA), features minimal junction capacitance (typ. <2 pF at 0 V), and maintains ESD insensitivity per MIL-STD-750 Method 1020 without external protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 39 V ±5% at 3.2 mA - defines regulated output voltage with tight tolerance for reference accuracy |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance | 80 Ω at IZK = 0.25 mA - indicates dynamic resistance affecting regulation stiffness under light load |
| Reverse Leakage Current | 0.1 μA at 29.7 V - ensures minimal parasitic current in standby or high-impedance bias networks |
| Temperature Coefficient | +0.094 %/°C - quantifies VZ drift with ambient temperature, critical for wide-temperature designs |
| Operating Temperature | –65°C to +175°C - enables use in aerospace, downhole, and industrial environments without derating |
| Forward Voltage | ≤1.5 V at 200 mA - supports bidirectional clamping or dual-use as rectifier in low-current paths |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode band marking; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded lead | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Banded lead | Connected to regulated voltage node; polarity must be observed to enable reverse-bias regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Industry-standard part numbering and electrical specification compliance for global interchangeability |
| Guaranteed six-parameter limits | VZ, IR, VF, ZZT, ZZK, αVZ all specified - eliminates need for incoming screening in high-reliability applications |
| Hermetic glass DO-35 package | Long-term moisture and contamination immunity - suitable for harsh-environment deployments |
| Radiation-hardened design | Inherently radiation tolerant per MicroNote 050 - validated for space-qualified and nuclear instrumentation use |
| Nonsensitive to ESD | No handling precautions required per MIL-STD-750 Method 1020 - reduces assembly line ESD control overhead |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage of linear regulators or switching converter feedback loops via resistive divider into error amplifier. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 39 V threshold for comparator or optocoupler input. Use Value: Enables ±1% output regulation accuracy with minimal temperature-induced drift due to +0.094 %/°C coefficient and low ZZK. | Use Scenario: Protecting microcontroller I/O pins or sensor inputs from transient overvoltage events exceeding 39 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting surge current away from sensitive downstream components. Use Value: Limits peak voltage to ≤39 V with sub-μA leakage below 29.7 V, preserving signal integrity during normal operation. |
| Industrial Sensor Excitation | Aerospace Voltage Monitoring |
Use Scenario: Providing stable excitation voltage to bridge-based pressure or strain sensors in factory automation systems. IC Role / Device Role / Timing Role: Precision Zener reference generating fixed bias for Wheatstone bridge operation. Use Value: Maintains excitation stability over –40°C to +85°C ambient with <±0.5% total drift, improving measurement repeatability. | Use Scenario: Monitoring bus voltage in satellite power distribution units where radiation tolerance and extended temperature range are mandatory. IC Role / Device Role / Timing Role: Radiation-hardened voltage reference for fault detection circuitry in high-reliability avionics. Use Value: Delivers verified performance from –65°C to +175°C and inherent TID resilience per MicroNote 050, eliminating qualification risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A (ON Semiconductor) | 39 V ±5%, 1 W rating, DO-41 package, 100 Ω ZZT at 31 mA - higher power but larger footprint and looser low-current impedance | Preferred for higher-power regulation where PCB space allows DO-41; less suitable for ultra-low-current references | Select when >500 mW dissipation or higher IZT is needed; verify thermal layout for 1 W rating |
| BZX55-C39 (Vishay) | 39 V ±5%, 500 mW, DO-35 package, 90 Ω ZZT at 5 mA - identical form factor but higher test current and slightly higher impedance | Compatible for drop-in replacement in legacy DO-35 layouts; requires validation of 5 mA bias network compatibility | Choose for cost-sensitive industrial designs where Microsemi sourcing is constrained; confirm αVZ match for temp-critical apps |
Compared with 1N4739A and BZX55-C39, the 1N5259B offers tighter low-current Zener impedance (80 Ω at 0.25 mA), superior temperature coefficient (+0.094 %/°C vs. typical +0.09–0.10 %/°C), and documented radiation hardness-making it optimal for precision, high-reliability, or extreme-environment applications where DO-35 size is fixed.
Availability
1N5259B is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and industrial sensor excitation requiring stable component supply across aerospace, oilfield, and medical electronics programs.
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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-voltage analog components for aerospace, defense, and industrial markets.
The 1N52xxB series was developed to deliver JEDEC-standardized, fully characterized Zener diodes with guaranteed six-parameter limits and extended temperature capability-targeting mission-critical voltage reference and protection functions.
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%, measured at a test current of 3.2 mA. This tolerance is guaranteed per JEDEC specification for the "B" suffix, ensuring predictable regulation behavior in production designs without additional binning or screening.
What package type and marking does the 1N5259B use?
The 1N5259B uses the DO-35 (DO-204AH) hermetically sealed glass axial-leaded package. The cathode is marked by a visible band on the glass body, and the full part number "1N5259B" is laser-marked or etched directly onto the device surface per standard Microsemi labeling practice.
How does the 1N5259B perform under extreme temperature conditions?
The 1N5259B is rated for continuous operation from –65°C to +175°C, with its Zener voltage drift characterized by a +0.094 %/°C temperature coefficient between 25°C and 125°C. This enables reliable regulation in downhole drilling tools, engine control units, and space-grade power monitors without external compensation.
Is the 1N5259B RoHS compliant, and how is compliance indicated?
Yes, RoHS-compliant versions of the 1N5259B are available with the "e3" suffix (e.g., 1N5259Be3), indicating annealed matte-tin plating per J-STD-609. Standard 1N5259B units use tin-lead plating; the e3 variant substitutes lead-free finish while maintaining identical electrical and thermal specifications.
What is the maximum reverse leakage current for the 1N5259B, and at what voltage is it specified?
The 1N5259B has a maximum reverse leakage current of 0.1 μA, specified at a reverse voltage of 29.7 V (75% of nominal VZ). This ultra-low leakage preserves signal integrity in high-impedance bias networks and minimizes quiescent power loss in battery-powered systems.
1N5259B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (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
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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