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Taiwan Semiconductor Corporation BZX85C24
- Part No.:
- BZX85C24
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C24.pdf
- Description:
- DIODE ZENER 24V 1.3W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,492
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Product details
Overview
BZX85C24 from Taiwan Semiconductor is a 1.3W, ±5% tolerance Zener diode with nominal breakdown voltage of 24V, designed for precision voltage regulation and reference in low-power DC circuits; it operates within -65°C to +200°C junction temperature range and features hermetically sealed DO-41 glass package.
For engineers reviewing the BZX85C24 datasheet, BZX85C24 pinout, BZX85C24 application, or BZX85C24 equivalent, key selection considerations include its 22.8V–25.6V VZ range at 10mA test current, 600Ω maximum Zener impedance, 0.5mA maximum leakage at 18V reverse bias, and suitability for on-board DC/DC converters requiring stable low-current references.
Technical Context
The BZX85C24 functions as a single-die, silicon planar Zener diode operating in reverse breakdown mode; its voltage regulation relies on controlled avalanche and Zener mechanisms depending on the 24V nominal rating, with thermal stability supported by a 130°C/W junction-to-ambient thermal resistance.
It is rated for continuous power dissipation of 1.3W at 25°C ambient, with derating above 50°C, and maintains specified electrical performance under pulse testing (10ms duration), ensuring reliability in transient-suppression and reference applications where steady-state biasing dominates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZT | 22.8–25.6V at 10mA test current - defines usable regulation window for stable reference generation |
| PD | 1.3W - maximum continuous power dissipation at 25°C, limiting bias current in series-regulator designs |
| ZZT | ≤600Ω - dynamic impedance at 10mA, indicating voltage stability under small-signal load variations |
| IR @ VR | ≤0.5µA at 18V - low leakage ensures minimal error in high-impedance reference nodes |
| TJ max | +200°C - enables operation in high-temperature industrial environments without derating penalties |
| RθJA | 130°C/W - determines required PCB copper area or heatsinking for thermal management at full power |
Pinout & Package
DO-41 glass axial package with cathode band marking; leads are pure tin plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in shunt regulator | Connected to lower-potential side of regulated circuit; establishes reference return path |
| Cathode | Reverse-biased Zener terminal / Regulated output node | Connected to input supply via current-limiting resistor; provides stable 24V reference voltage |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables predictable regulation across production batches without post-assembly trimming |
| Hermetically sealed glass case | Prevents moisture ingress and long-term parameter drift in humid or outdoor environments |
| RoHS-compliant construction | Meets global environmental compliance requirements for industrial and consumer electronics |
| Single-die configuration | Ensures consistent thermal coupling and avoids mismatch-induced voltage errors in multi-die alternatives |
Applications
| Low-Voltage Stabilizers | On-Board DC/DC Converters |
|---|---|
Use Scenario: Providing fixed 24V reference for feedback networks in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Shunt voltage reference regulating error amplifier input in secondary-side feedback loop. Use Value: Maintains ±5% output accuracy over temperature and line variations due to tight VZ tolerance and low ZZT. | Use Scenario: Biasing gate drivers or sensing rail voltages in compact point-of-load regulators. IC Role / Device Role / Timing Role: Precision voltage clamp protecting control IC inputs from overvoltage transients. Use Value: Limits voltage excursions to ≤25.6V with sub-µA leakage, preserving signal integrity in low-power monitoring paths. |
| Lighting Applications | Adapters |
Use Scenario: Setting constant-current thresholds in LED driver ICs or analog dimming circuits. IC Role / Device Role / Timing Role: Voltage reference for current-sense comparator trip point in linear LED controllers. Use Value: Delivers stable 24V threshold despite ambient temperature swings up to +85°C ambient. | Use Scenario: Output voltage regulation in wall-mounted AC/DC adapters for industrial sensors. IC Role / Device Role / Timing Role: Secondary-side shunt regulator maintaining output stability under light-load conditions. Use Value: Supports no-load regulation with <0.5µA leakage, reducing standby power consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | Same 24V nominal VZ, but ±5% tolerance and 1W power rating vs. BZX85C24's 1.3W | Lower power handling limits use in higher-current reference paths | Select when board space allows DO-41 footprint and thermal budget permits 1W operation |
| MMBZ5249BS | SOT-23 surface-mount package, same 24V VZ and ±5%, but only 225mW PD | Not suitable for through-hole or high-power reference designs | Choose for space-constrained PCBs where reflow compatibility and miniaturization outweigh power needs |
Compared with 1N4749A and MMBZ5249BS, the BZX85C24 offers higher power capability (1.3W) in a robust axial DO-41 package, making it preferable for through-hole designs requiring sustained 10mA+ bias current and industrial-grade thermal resilience.
Availability
BZX85C24 is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, lighting applications, and adapter designs requiring stable component supply with full traceability and long-lifecycle support.
Supply support for BZX85C24 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and protection components for industrial and automotive markets.
The BZX85C24 belongs to TSC's BZX85C series of general-purpose Zener diodes, engineered for reliable voltage reference and stabilization in cost-sensitive, high-reliability power management systems.
FAQ
What is the Zener voltage tolerance for BZX85C24?
The BZX85C24 has a nominal Zener voltage of 24V with a standard tolerance of ±5%, resulting in a guaranteed breakdown range of 22.8V to 25.6V at 10mA test current. This tolerance is confirmed in the Electrical Specifications table of the official Taiwan Semiconductor datasheet (Version H2301). The BZX85C24 maintains this specification across its qualified operating temperature range.
What is the maximum power dissipation of BZX85C24?
The BZX85C24 is rated for 1.3W maximum power dissipation at 25°C ambient temperature, as specified in the Absolute Maximum Ratings table. Derating is required above 50°C ambient, following the device's thermal resistance profile (RθJA = 130°C/W). This value defines the upper limit for continuous DC bias current in shunt regulator configurations using the BZX85C24.
What package type does BZX85C24 use?
The BZX85C24 uses the DO-41 axial leaded glass package, with cathode polarity indicated by a painted band. Its mechanical dimensions-including 2.8mm body diameter, 5.2mm length, and 0.86mm lead diameter-are documented in the Package Outline Dimensions drawing (HQ2SD07-DO41-059 REV A). This package supports manual and wave soldering per J-STD-002 standards.
What is the Zener impedance of BZX85C24 at its test current?
The BZX85C24 exhibits a maximum Zener impedance (ZZT) of 600Ω at the specified test current of 10mA, measured using a 60Hz AC signal superimposed on the DC bias. This value reflects the device's dynamic resistance in regulation mode and directly impacts output voltage stability under varying load conditions in circuits utilizing the BZX85C24 as a reference.
Is BZX85C24 RoHS compliant?
Yes, the BZX85C24 is RoHS compliant, as explicitly stated in the Features section of the Taiwan Semiconductor datasheet (Version H2301). It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits, meeting EU Directive 2011/65/EU requirements for environmentally responsible electronics manufacturing.
BZX85C24 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 18 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 10 mA
- Operating Temperature:
- -65°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
BZX85C24 FAQ
1.How can I place an order for BZX85C24 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C24 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 reliable?
The price and inventory of BZX85C24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C24 is usually 5 days.
3.What payment methods are accepted for BZX85C24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C24?
BZX85C24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C24 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?
For technical support, including BZX85C24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C24 requirements.
6.How does Aetrix verify that BZX85C24 is sourced from the original manufacturer or authorized distributors?
All BZX85C24 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 meets industry standards.
7.What is the process for return or replacement of BZX85C24?
All BZX85C24 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C24, 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 part is unused and in its original packaging.
Return procedure for BZX85C24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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