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onsemi BZX85C24_T50A
- Part No.:
- BZX85C24_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C24_T50A.pdf
- Description:
- DIODE ZENER 24V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,257
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Product details
Overview
BZX85C24_T50A from onsemi is a 24 V ±5% Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at 25°C, with zener impedance of 10 Ω at 25 mA test current and leakage current ≤0.5 μA at 19 V reverse voltage. It provides stable voltage reference in power supply regulation and overvoltage protection circuits.
For engineers reviewing the BZX85C24_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating (6.67 mW/°C above 50°C), junction temperature range (–65°C to +200°C), and DO-41 mechanical compatibility with axial-leaded PCB layouts.
Technical Context
The BZX85C24_T50A operates as a silicon planar Zener diode optimized for voltage regulation and clamping in DC power rails. Its 24 V nominal breakdown voltage is specified at IZ = 25 mA with tight 5% tolerance and low dynamic impedance (10 Ω), enabling precise reference stability under varying load conditions.
It features a glass-passivated DO-41 package with cathode band marking, supporting operation across –65°C to +200°C junction temperature range. Thermal derating begins at 50°C ambient, reducing maximum power by 6.67 mW per °C up to TL = 25°C at 4 mm lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 25.6 V max at IZ = 25 mA - defines regulated output range for feedback loops and clamp thresholds |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - sets maximum continuous DC power handling without heatsinking |
| Zener Impedance (ZZ) | 10 Ω @ IZ = 25 mA - determines AC ripple rejection and regulation sensitivity to current variation |
| Leakage Current (IR) | ≤0.5 μA @ VR = 19 V - ensures minimal standby current in high-impedance bias networks |
| Operating Temperature | –65°C to +200°C - supports industrial, automotive under-hood, and aerospace environments |
| Thermal Derating | 6.67 mW/°C above 50°C - requires layout-aware thermal design for sustained >50°C ambient operation |
| Forward Voltage (VF) | ≤1.2 V @ IF = 200 mA - enables use as polarity protection diode in series with regulated rail |
Pinout & Package
DO-41 glass axial-leaded package with cathode indicated by color band. Leads are tinned copper-clad steel; body diameter 2.03–2.72 mm, overall length ≥25.40 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal during forward conduction | Connected to lower-potential node in reverse-biased regulation; used for polarity protection in forward bias |
| Cathode | Negative terminal during forward conduction; Zener breakdown terminal | Marked with color band; connected to higher-potential node in regulation mode; defines reference voltage node |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive power supplies |
| Low Zener impedance (10 Ω) | Maintains <±0.25 V output shift across 10–30 mA operating current range |
| High-temperature operation (TJ = +200°C) | Supports placement near heat-generating components in enclosed industrial enclosures |
| DO-41 glass package | Provides hermetic sealing and long-term parameter stability vs. plastic-packaged alternatives |
| 1.0 W power rating | Allows direct replacement of lower-power Zeners (e.g., 1N4748A) without board redesign |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Regulates auxiliary 5 V rail in flyback converter using optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener reference for TL431-like shunt regulator circuit; sets precise trip point for error amplifier. Use Value: 24 V breakdown enables stable 5 V output via resistor divider; ±5% tolerance avoids need for external trimming resistors. |
Use Scenario: Protects 3.3 V GPIO pins from transient surges exceeding 5 V. IC Role / Device Role / Timing Role: Clamping diode placed between I/O line and 3.3 V rail; conducts when voltage exceeds 24 V + VCC. Use Value: Low leakage (≤0.5 μA) prevents signal degradation; DO-41 axial form factor allows easy prototyping on breadboard or through-hole PCB. |
| Industrial Sensor Signal Conditioning | Automotive Battery Monitoring Reference |
Use Scenario: Provides stable 24 V reference for 4–20 mA transmitter calibration circuitry. IC Role / Device Role / Timing Role: Precision voltage source for DAC output scaling and ADC reference buffer biasing. Use Value: 10 Ω ZZ ensures <0.25 V drift over 20 mA load variation; DO-41 package withstands vibration in factory-floor installations. |
Use Scenario: Serves as overvoltage threshold detector in 24 V truck battery monitoring module. IC Role / Device Role / Timing Role: Zener element in comparator input network; triggers shutdown when battery exceeds 28 V. Use Value: –65°C to +200°C rating covers cold-cranking to under-hood thermal soak; glass passivation resists humidity-induced parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5249B | 24 V ±5%, 0.5 W rating, DO-35 package, ZZ = 35 Ω @ 10 mA | Lower power and higher impedance limit use in >100 mA regulation paths | Select when space-constrained layouts require smaller DO-35 footprint and thermal load is ≤0.5 W |
| MMBZ5249BS | 24 V ±5%, 0.3 W, SOT-23 package, ZZ = 33 Ω @ 20 mA | Surface-mount only; unsuitable for high-reliability through-hole designs or manual rework | Choose for automated assembly of compact consumer electronics where DO-41 is mechanically incompatible |
Compared with BZX85C24_T50A, the 1N5249B offers identical voltage spec but reduced power and higher impedance, while the MMBZ5249BS trades mechanical robustness and thermal capability for miniaturization-making BZX85C24_T50A optimal for industrial-grade through-hole regulation requiring 1.0 W and DO-41 reliability.
Availability
BZX85C24_T50A is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery monitors, sensor signal conditioners, and overvoltage protection circuits requiring stable component supply and long-lifecycle support.
Supply support for BZX85C24_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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The BZX85C24_T50A belongs to the BZX85C series of general-purpose Zener diodes designed for reliable voltage regulation and transient suppression in cost-sensitive, high-volume industrial and automotive applications.
FAQ
What is the Zener voltage tolerance for BZX85C24_T50A?
The BZX85C24_T50A has a guaranteed Zener voltage range of 22.8 V to 25.6 V at IZ = 25 mA, corresponding to a ±5% tolerance. This specification is verified per the onsemi datasheet Rev. 2 (October 2017) and applies across the full operating temperature range of –65°C to +200°C. The BZX85C24_T50A maintains this tolerance without requiring binning or external calibration.
Can BZX85C24_T50A be used in surface-mount designs?
No - the BZX85C24_T50A uses a DO-41 axial-leaded glass package intended for through-hole mounting only. It lacks solder pads or terminations compatible with reflow or wave soldering processes. For surface-mount equivalents, consider the MMBZ5249BS (SOT-23) or NZ9F24ST5G (SOD-923), both of which differ in power rating, impedance, and thermal performance from the BZX85C24_T50A.
What is the maximum reverse leakage current for BZX85C24_T50A?
The BZX85C24_T50A exhibits ≤0.5 μA reverse leakage current at VR = 19 V and TA = 25°C, as specified in the onsemi Electrical Characteristics table. This low leakage ensures minimal loading on high-impedance reference nodes and preserves accuracy in precision biasing circuits where the BZX85C24_T50A serves as a stable voltage source.
How does thermal derating affect BZX85C24_T50A's power handling?
The BZX85C24_T50A must be derated linearly at 6.67 mW/°C above 50°C ambient temperature. At 70°C ambient, its usable power drops to 0.866 W; at 100°C, it falls to 0.633 W. This derating reflects junction-to-lead thermal resistance and must be accounted for in thermally constrained enclosures where the BZX85C24_T50A regulates continuous current.
Is BZX85C24_T50A suitable for automotive under-hood applications?
Yes - the BZX85C24_T50A is qualified for operation from –65°C to +200°C junction temperature and uses a hermetically sealed DO-41 glass package resistant to thermal cycling and moisture ingress. These characteristics make it suitable for automotive battery monitoring, alternator regulation, and engine control unit protection circuits where the BZX85C24_T50A functions as a rugged voltage clamp or reference.
BZX85C24_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±6%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 17 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-41
BZX85C24_T50A FAQ
1.How can I place an order for BZX85C24_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C24_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 BZX85C24_T50A reliable?
The price and inventory of BZX85C24_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C24_T50A is usually 5 days.
3.What payment methods are accepted for BZX85C24_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C24_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C24_T50A?
BZX85C24_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C24_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 BZX85C24_T50A?
For technical support, including BZX85C24_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C24_T50A requirements.
6.How does Aetrix verify that BZX85C24_T50A is sourced from the original manufacturer or authorized distributors?
All BZX85C24_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 BZX85C24_T50A meets industry standards.
7.What is the process for return or replacement of BZX85C24_T50A?
All BZX85C24_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C24_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 BZX85C24_T50A part is unused and in its original packaging.
Return procedure for BZX85C24_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C24_T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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