My Inquiry
My Account
onsemi BZX85C24-ON
- Part No.:
- BZX85C24-ON
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C24-ON.pdf
- Description:
- DIODE ZENER 24V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:33,437
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX85C24-ON from onsemi is a 24 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, with zener impedance of 10 Ω at 25 mA and leakage current ≤0.5 μA at 19 V, used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX85C24-ON datasheet, pinout, applications, or equivalent options, key selection criteria include its 24 V nominal zener voltage, 10 Ω dynamic impedance at IZ = 25 mA, thermal derating of 6.67 mW/°C above 50°C, and DO-41 mechanical compatibility with legacy through-hole designs.
Technical Context
The BZX85C24-ON operates as a silicon planar Zener diode optimized for stable voltage reference and shunt regulation in DC power rails. It maintains specified VZ within ±5% tolerance across 5 mA to 70 mA test current range and exhibits low dynamic impedance (10 Ω) at 25 mA, enabling tight regulation under varying load conditions.
Its DO-41 glass package supports junction temperature operation from –65°C to +200°C and provides hermetic sealing for reliability in industrial environments. The device is not rated for surge or transient suppression - it is intended for steady-state voltage clamping and reference applications only.
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 voltage window under standard test conditions |
| Power Dissipation (PD) | 1.0 W at TA = 25°C - maximum continuous power handling at ambient; derates linearly above 50°C |
| Zener Impedance (ZZ) | 10 Ω at IZ = 25 mA - low dynamic resistance ensures minimal output voltage variation with current changes |
| Leakage Current (IR) | ≤0.5 μA at VR = 19 V - guarantees negligible standby current in high-impedance bias networks |
| Operating Temperature | –65°C to +200°C - enables use in automotive under-hood, industrial control, and aerospace environments |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - ensures predictable turn-on behavior when used in reverse-biased clamp or forward-biased protection roles |
Pinout & Package
DO-41 glass axial package with cathode indicated by a color band on the body. Leads are tinned copper-clad steel; body diameter 2.03–2.72 mm, length ≥25.4 mm, lead spacing unrestricted per JEDEC DO-204AL.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener mode | Must be held ≤19 V below cathode to avoid significant leakage; forms return path in shunt regulator topology |
| Cathode | Current exit terminal in forward bias; connected to higher-potential node in Zener mode | Connected to regulated rail; voltage at this node is stabilized at VZ when reverse current ≥5 mA flows |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct replacement in legacy 24 V reference designs without recalibration or resistor adjustment |
| Low ZZ = 10 Ω @ 25 mA | Reduces output voltage drift to <±25 mV per 2.5 mA load change - critical for analog sensing front-ends |
| DO-41 glass package | Provides hermetic seal and thermal stability up to +200°C junction temperature - suitable for reflow-unfriendly assemblies |
| 1.0 W power rating | Supports dissipation of up to 24 V × 41.7 mA - sufficient for feedback divider biasing and moderate-current clamping |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Stabilizing error amplifier input in isolated flyback converter feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 24 V threshold for optocoupler-driven regulation. Use Value: Maintains ±1% output voltage accuracy across line/load variations due to low ZZ and tight VZ tolerance. |
Use Scenario: Generating stable excitation voltage for RTD or strain gauge bridge circuits. IC Role / Device Role / Timing Role: Low-drift voltage reference source powering Wheatstone bridge arms. Use Value: Leakage current ≤0.5 μA prevents bridge imbalance errors; DO-41 thermal stability minimizes drift over temperature. |
| Overvoltage Clamp for MCU I/O | Legacy Equipment Voltage Calibration |
Use Scenario: Protecting 3.3 V or 5 V microcontroller GPIO pins against accidental 24 V miswiring. IC Role / Device Role / Timing Role: Shunt clamp limiting pin voltage to safe level during fault condition. Use Value: 1.0 W rating absorbs transient energy without failure; fast response (<1 ns) prevents latch-up in protected ICs. |
Use Scenario: Replacing obsolete calibration references in field-serviceable test instruments. IC Role / Device Role / Timing Role: Drop-in voltage standard for potentiometer-based trim adjustments. Use Value: Identical DO-41 footprint and ±5% tolerance allow direct substitution without board modification or recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A-T | VZ = 24 V ±5%, PD = 1.0 W, ZZ = 15 Ω @ 21 mA, DO-41 plastic package | Higher ZZ and plastic body reduce thermal stability vs. glass; less suitable for >100°C ambient | Acceptable where cost sensitivity outweighs long-term drift requirements; verify thermal derating in enclosed enclosures |
| BZX55C24-TR | VZ = 24 V ±5%, PD = 0.5 W, ZZ = 20 Ω @ 5 mA, DO-35 glass package | Half the power rating and higher impedance limit current-handling and regulation precision | Only suitable for low-power bias networks; not recommended for shunt regulation above 10 mA load |
Compared with BZX85C24-ON, the 1N4749A-T offers lower cost but reduced thermal reliability in high-temp environments, while the BZX55C24-TR sacrifices power handling and regulation fidelity for smaller size - making BZX85C24-ON optimal for industrial-grade 24 V reference and clamp duties requiring DO-41 robustness.
Availability
BZX85C24-ON is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning circuits, and legacy equipment repair requiring stable component supply with full traceability and long-lifecycle support.
Supply support for BZX85C24-ON 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The BZX85C24-ON belongs to the BZX85C series of general-purpose Zener diodes designed specifically for reliable voltage regulation and reference in cost-sensitive, high-volume industrial and consumer power systems.
FAQ
What is the exact zener voltage range for BZX85C24-ON at 25 mA test current?
The BZX85C24-ON has a guaranteed zener voltage range of 22.8 V minimum to 25.6 V maximum when measured at IZ = 25 mA and TL = 30°C ±1°C. This ±5% tolerance is verified per onsemi's BZX85C3V3–BZX85C56 datasheet Rev. 2 (October 2017), and applies strictly under the defined thermal test conditions - not at arbitrary ambient temperatures or currents.
Can BZX85C24-ON be used as a transient voltage suppressor (TVS)?
No - the BZX85C24-ON is not rated or characterized for transient suppression. It lacks specified peak pulse power, clamping voltage under surge conditions, or response time metrics required for TVS diodes. Its 1.0 W rating applies only to steady-state DC dissipation; using BZX85C24-ON for surge protection risks catastrophic failure. Use dedicated TVS devices like SMAJ24A for such applications.
What is the maximum reverse leakage current for BZX85C24-ON and at what voltage is it specified?
The BZX85C24-ON has a maximum reverse leakage current of 0.5 μA, specified at VR = 19 V and TA = 25°C. This value is confirmed in the Electrical Characteristics table of the official onsemi datasheet and reflects worst-case leakage under sub-zener bias - critical for high-impedance reference networks where leakage could induce offset errors.
Is BZX85C24-ON compatible with lead-free reflow soldering processes?
Yes - the DO-41 glass package of BZX85C24-ON supports lead-free reflow per J-STD-020. Its glass body withstands peak temperatures up to 260°C for 10 seconds. However, thermal shock must be avoided: ramp rates should not exceed 3°C/s, and the device must not be subjected to repeated reflow cycles due to potential seal integrity degradation.
Does BZX85C24-ON have a specified forward voltage, and how is it relevant in circuit design?
Yes - BZX85C24-ON specifies a maximum forward voltage of 1.2 V at IF = 200 mA. This parameter matters when the diode is intentionally forward-biased (e.g., in polarity-protection schemes or dual-direction clamp configurations), ensuring predictable conduction drop and enabling accurate calculation of series resistor values for current limiting.
BZX85C24-ON Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- 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-ON FAQ
1.How can I place an order for BZX85C24-ON through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C24-ON 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-ON reliable?
The price and inventory of BZX85C24-ON are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C24-ON is usually 5 days.
3.What payment methods are accepted for BZX85C24-ON?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C24-ON transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C24-ON?
BZX85C24-ON orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C24-ON 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-ON?
For technical support, including BZX85C24-ON datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C24-ON requirements.
6.How does Aetrix verify that BZX85C24-ON is sourced from the original manufacturer or authorized distributors?
All BZX85C24-ON 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-ON meets industry standards.
7.What is the process for return or replacement of BZX85C24-ON?
All BZX85C24-ON units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C24-ON, 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-ON part is unused and in its original packaging.
Return procedure for BZX85C24-ON:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C24-ON 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…
