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Taiwan Semiconductor Corporation BZX585B24
- Part No.:
- BZX585B24
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585B24.pdf
- Description:
- DIODE ZENER 24V 200MW SOD523F
- Quantity:
- Payment:
- Shipping:
Inventory:4,738
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Product details
Overview
BZX585B24 from Taiwan Semiconductor is a surface-mount Zener diode with nominal zener voltage 24 V ±2%, 200 mW power dissipation, 70 Ω dynamic impedance at 5 mA test current, and SOD-523F package. It provides precise voltage regulation in low-power biasing, reference, and protection circuits for consumer and industrial electronics.
For engineers reviewing the BZX585B24 datasheet, BZX585B24 pinout, BZX585B24 application, or BZX585B24 equivalent, key selection factors include its 24 V zener tolerance (±2%), low leakage (<0.045 µA at 18.4 V), temperature coefficient (+0.045 mV/°C), and MSL1 reflow compatibility up to 260°C/10s.
Technical Context
The BZX585B24 operates as a two-terminal voltage reference device, conducting in reverse breakdown at precisely controlled 24 V under 5 mA test current. Its zener impedance remains stable below 70 Ω across operating current range, and it exhibits low temperature drift (+0.045 mV/°C) enabling stable performance over −65°C to +150°C junction temperature.
Designed for surface-mount assembly, the device uses silicon planar construction with halogen-free epoxy and Pb-free terminations. Thermal resistance from junction to ambient is 680°C/W, limiting continuous power dissipation to 200 mW at 25°C ambient, derating linearly above that point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V nominal, 23.52–24.48 V at 5 mA - ensures tight regulation for 24 V rail sensing and clamping |
| Power Dissipation | 200 mW - supports low-power bias networks without heatsinking |
| Zener Impedance (ZZT) | 70 Ω max at IZT = 5 mA - maintains voltage stability under small-signal load variations |
| Reverse Leakage (IR) | ≤0.045 µA at VR = 18.4 V - enables high-impedance reference nodes with minimal error |
| Tolerance | ±2% - meets precision requirements for analog feedback and calibration circuits |
| Thermal Resistance (RθJA) | 680°C/W - defines safe ambient temperature limits for PCB layout and thermal design |
| Junction Temperature | −65°C to +150°C - supports operation in extended industrial environments |
Pinout & Package
SOD-523F package: ultra-small surface-mount outline (1.6 × 0.8 × 0.6 mm), anode-cathode polarity marked by cathode band, compatible with standard 0201 placement equipment and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common or lower-potential node during zener operation |
| Cathode | Zener breakdown terminal / Regulated output node | Provides stable 24 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener Tolerance | Enables direct use in 24 V reference designs without trimming or calibration |
| MSL1 Moisture Sensitivity | Allows unlimited floor life and single-reflow processing without baking |
| Halogen-Free & RoHS Compliant | Meets IPC-1752A material declaration and environmental compliance requirements |
| 260°C/10s Soldering Guarantee | Supports lead-free reflow without parametric shift or bond integrity loss |
| Low Capacitance (~1.0 pF) | Minimizes signal coupling in high-frequency bias and RF detector applications |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side TL431-like shunt regulator circuits. IC Role / Device Role / Timing Role: Precision 24 V reference node establishing output voltage setpoint. Use Value: ±2% tolerance and low tempco ensure <±1% output regulation over −40°C to +85°C ambient. |
Use Scenario: Clamping transient surges on 24 V industrial control inputs (e.g., PLC digital I/O). IC Role / Device Role / Timing Role: Reverse-biased voltage clamp absorbing ESD and inductive kick energy. Use Value: 200 mW rating and 70 Ω ZZT limit clamped voltage to ≤25.5 V at 5 mA surge. |
| Reference Voltage Source | LED Current Biasing |
Use Scenario: Generating stable 24 V reference for ADC voltage scaling or DAC output calibration. IC Role / Device Role / Timing Role: Low-drift, low-leakage voltage reference driving high-impedance op-amp inputs. Use Value: 0.045 µA max leakage at 18.4 V prevents loading errors in >10 MΩ input networks. |
Use Scenario: Setting constant current for 24 V LED strings in signage or indicator panels. IC Role / Device Role / Timing Role: Zener-based current source element defining emitter-base voltage drop of series pass transistor. Use Value: Tight 24 V tolerance ensures consistent LED brightness across production units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5249BS-7-F (Diodes Inc.) | 24 V ±5%, 350 mW, SOD-323 package, 100 Ω ZZT at 10 mA | Higher power but looser tolerance and higher impedance - suitable where cost or availability outweighs precision | Select when board space allows larger SOD-323 footprint and ±5% regulation is acceptable |
| BZX384-C24 (Nexperia) | 24 V ±5%, 300 mW, SOD-323, 80 Ω ZZT at 5 mA, MSL3 | Requires baking before reflow; wider tolerance reduces accuracy in reference circuits | Prefer for cost-sensitive consumer designs where MSL1 and ±2% are non-critical |
Compared with MMBZ5249BS-7-F and BZX384-C24, the BZX585B24 delivers tighter voltage tolerance (±2% vs. ±5%), lower zener impedance (70 Ω vs. ≥80 Ω), and MSL1 handling - making it optimal for precision industrial references where long-term stability and zero-preconditioning assembly are required.
Availability
BZX585B24 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and medical instrumentation requiring stable component supply, traceable sourcing, and lifecycle continuity.
Supply support for BZX585B24 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 devices, analog ICs, and power solutions for industrial, computing, and consumer markets.
The BZX585B24 belongs to TSC's Small Signal Product line, engineered for high-precision, low-power voltage regulation in space-constrained surface-mount applications demanding reliability and environmental compliance.
FAQ
What is the maximum reverse voltage the BZX585B24 can withstand before breakdown?
The BZX585B24 has a nominal zener voltage of 24 V with a guaranteed range of 23.52 V to 24.48 V at 5 mA test current. Its reverse breakdown occurs within this band; operation below 18.4 V ensures leakage remains ≤0.045 µA. Exceeding 24.48 V continuously risks thermal runaway if power dissipation exceeds 200 mW.
Is the BZX585B24 suitable for use in high-reliability automotive applications?
The BZX585B24 is not AEC-Q200 qualified and is not recommended for safety-critical automotive subsystems. However, it is used in non-safety automotive body electronics (e.g., mirror controls, lighting modules) where its −65°C to +150°C junction temperature range, Pb-free RoHS compliance, and MSL1 handling meet functional requirements.
Does the BZX585B24 have a specified capacitance value, and how does it affect high-frequency performance?
Yes - the BZX585B24 exhibits typical capacitance of 1.0 pF at 0 V bias, rising slightly with applied reverse voltage. This ultra-low capacitance minimizes loading effects in RF detector bias networks and fast-switching protection circuits, preserving signal integrity up to several hundred MHz.
Can the BZX585B24 replace older BZX55 or BZX79 series Zeners in existing designs?
No - the BZX585B24 uses SOD-523F packaging (1.6 × 0.8 mm), while BZX55/BZX79 are through-hole DO-35 or SMD SOD-123 packages. Physical replacement requires PCB redesign. Electrically, its tighter tolerance and lower ZZT may improve performance, but mechanical incompatibility prevents drop-in substitution.
What is the thermal resistance (RθJA) of the BZX585B24, and how does it impact power derating?
The BZX585B24 has RθJA = 680°C/W. At 25°C ambient, it supports full 200 mW dissipation. Above 25°C, power must be linearly derated: e.g., at 75°C ambient, max power = 200 mW × (1 − (75−25)/680) ≈ 185 mW. Layout with copper pour improves effective RθJA.
BZX585B24 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 16.8 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523F
BZX585B24 FAQ
1.How can I place an order for BZX585B24 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585B24 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 BZX585B24 reliable?
The price and inventory of BZX585B24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585B24 is usually 5 days.
3.What payment methods are accepted for BZX585B24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585B24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585B24?
BZX585B24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585B24 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 BZX585B24?
For technical support, including BZX585B24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585B24 requirements.
6.How does Aetrix verify that BZX585B24 is sourced from the original manufacturer or authorized distributors?
All BZX585B24 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 BZX585B24 meets industry standards.
7.What is the process for return or replacement of BZX585B24?
All BZX585B24 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585B24, 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 BZX585B24 part is unused and in its original packaging.
Return procedure for BZX585B24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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