My Inquiry
My Account
onsemi 1N5259B_T50R
- Part No.:
- 1N5259B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5259B_T50R.pdf
- Description:
- DIODE ZENER 39V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,663
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5259B_T50R 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 10 mA test current and 0.25 μA maximum 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_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal coefficient (+0.094 %/°C), junction temperature range (–65 to +200°C), and DO-35 mechanical compatibility with legacy through-hole PCB layouts.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable voltage reference and shunt regulation. Its 39 V nominal breakdown voltage is specified at IZ = 10 mA, with dynamic impedance (ZZ) of 80 Ω and knee impedance (ZZK) of 700 Ω at IZK = 1 mA.
The DO-35 hermetically sealed glass package ensures long-term stability and low leakage (≤0.25 μA at VR = 30.4 V), while the –65°C to +200°C operating junction temperature range supports industrial and automotive under-hood applications requiring robust thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.05 V min / 39 V typ / 40.95 V max @ IZ = 10 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TA = 25°C - sets maximum continuous DC power handling before thermal derating applies |
| Dynamic Impedance (ZZ) | 80 Ω @ IZ = 10 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 30.4 V - ensures minimal quiescent current in standby regulation circuits |
| Temperature Coefficient (TC) | +0.094 %/°C - quantifies VZ drift per degree Celsius above 25°C, critical for temperature-stable references |
| Junction Temperature Range | –65°C to +200°C - enables operation in extreme environments including automotive engine compartments |
| Package | DO-35 glass - industry-standard axial leaded package with cathode band marking and 0.137 g mass |
Pinout & Package
DO-35 glass package: axial-leaded, hermetically sealed, cathode indicated by color band; overall length 4.56 mm, body diameter 1.91 mm, lead diameter 0.46 mm, weight 0.137 g.
| 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 (VF ≤ 1.2 V) |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; sustains controlled reverse breakdown at VZ; marked by visible color band on DO-35 body |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-manufacture trimming in cost-sensitive consumer and industrial designs |
| Low reverse leakage (≤0.25 μA) | Minimizes standby power loss in battery-powered voltage monitor and clamp circuits |
| Hermetic DO-35 glass construction | Provides long-term parameter stability and moisture resistance unmatched by plastic-packaged alternatives |
| Wide operating temperature range | Supports reliable operation from cryogenic storage to under-hood automotive environments without derating |
| JEDEC DO-204AH compliant | Ensures mechanical interchangeability with legacy 1N52xx series parts across global supply chains |
Applications
| Reference Voltage Source | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable bias voltage for op-amp comparators and ADC reference buffers in sensor signal conditioning modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 39 V rail for analog front-end circuitry. Use Value: Tight ±5% VZ tolerance and +0.094 %/°C TC ensure <±2% total drift over –40°C to +85°C ambient, eliminating need for external calibration. | Use Scenario: Protecting microcontroller I/O pins from transient surges in industrial PLC input modules. IC Role / Device Role / Timing Role: Reverse-biased clamping element diverting ESD or inductive kick energy above 39 V threshold. Use Value: Low 80 Ω ZZ limits clamped voltage overshoot during fast transients, reducing stress on downstream logic inputs. |
| Power Supply Feedback | Current Source Bias |
Use Scenario: Setting output voltage in isolated flyback converter feedback networks using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Precision voltage reference in secondary-side regulation loop. Use Value: Stable VZ over temperature ensures consistent output voltage regulation across full load and ambient range without compensation circuitry. | Use Scenario: Establishing constant current for LED biasing or transistor base drive in low-cost lighting drivers. IC Role / Device Role / Timing Role: Voltage reference enabling simple two-resistor current source topology. Use Value: Low 0.25 μA leakage minimizes error in high-impedance bias networks, improving current accuracy to ±1.5% over production lot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5259BRLG | Same electrical specs; tape-and-reel packaging (T50R vs. RLG) with different reel quantity and moisture sensitivity level | No functional difference; suited for automated SMT placement where tape format required | Select 1N5259BRLG only when surface-mount assembly line requires tape-and-reel delivery |
| BZX55-C39 | 39 V ±5%, but higher ZZ (100 Ω), wider temp range (–65°C to +175°C), plastic DO-35 package | Lower cost but reduced thermal stability and long-term drift due to non-hermetic construction | Choose BZX55-C39 for non-critical commercial applications where cost outweighs long-term reliability |
Compared with 1N5259B_T50R, 1N5259BRLG offers identical regulation performance in tape format for pick-and-place lines, while BZX55-C39 trades hermetic stability for lower cost and slightly reduced thermal capability-making the original preferred for mission-critical analog references.
Availability
1N5259B_T50R is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and power supply feedback applications requiring stable component supply and long-term parametric consistency.
Supply support for 1N5259B_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 energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1N52xxB series belongs to ON Semiconductor's legacy Zener diode product line, designed specifically for general-purpose voltage regulation and reference applications where hermetic reliability and tight tolerance are essential.
FAQ
What is the Zener voltage tolerance for 1N5259B_T50R?
The 1N5259B_T50R has a Zener voltage tolerance of ±5%, meaning its breakdown voltage ranges from 37.05 V to 40.95 V at 10 mA test current. This tolerance is guaranteed across production lots and is verified during final test. The 1N5259B_T50R maintains this specification under standard operating conditions without requiring binning or sorting.
Does 1N5259B_T50R have a specified forward voltage?
Yes, the 1N5259B_T50R has a maximum forward voltage (VF) of 1.2 V at 200 mA forward current, as stated in the Absolute Maximum Ratings section. This parameter is relevant when the device is used in forward-conduction mode, such as in polarity protection or low-voltage clamping. The 1N5259B_T50R does not specify typical or minimum VF, only the upper limit.
What is the thermal derating behavior of 1N5259B_T50R above 50°C?
The 1N5259B_T50R derates linearly at 4.0 mW/°C above 50°C ambient temperature. Starting from its 500 mW rating at 25°C, usable power drops to 400 mW at 75°C and 300 mW at 100°C. This derating ensures safe junction temperature operation and is defined in the Absolute Maximum Ratings table. The 1N5259B_T50R must be mounted with adequate PCB copper area or airflow if operated near thermal limits.
Is 1N5259B_T50R compatible with lead-free soldering processes?
Yes, the 1N5259B_T50R supports lead-free reflow soldering with a maximum lead temperature of +230°C for 10 seconds at 1/16 inch from case, as specified in the Absolute Maximum Ratings. Its DO-35 glass package is rated for standard JEDEC J-STD-020 profiles. The 1N5259B_T50R is RoHS-compliant and suitable for both wave and reflow assembly, provided peak temperatures do not exceed the specified limit.
How does the temperature coefficient of 1N5259B_T50R affect long-term voltage stability?
The 1N5259B_T50R has a positive temperature coefficient of +0.094 %/°C, meaning its Zener voltage increases by approximately 36.7 mV per °C rise above 25°C. Over a –40°C to +85°C ambient range, this results in ~4.6 V total shift. For high-stability applications, this drift must be compensated in system-level design. The 1N5259B_T50R's coefficient is tightly controlled and repeatable across units, enabling predictable calibration.
1N5259B_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):
- 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_T50R FAQ
1.How can I place an order for 1N5259B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5259B_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 1N5259B_T50R reliable?
The price and inventory of 1N5259B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5259B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5259B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5259B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5259B_T50R?
1N5259B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5259B_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 1N5259B_T50R?
For technical support, including 1N5259B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5259B_T50R requirements.
6.How does Aetrix verify that 1N5259B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5259B_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 1N5259B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5259B_T50R?
All 1N5259B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5259B_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 1N5259B_T50R part is unused and in its original packaging.
Return procedure for 1N5259B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5259B_T50R 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
