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Vishay General Semiconductor - Diodes Division BZX55C24-TR
- Part No.:
- BZX55C24-TR
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C24-TR.pdf
- Description:
- DIODE ZENER 24V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,926
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Product details
Overview
BZX55C24-TR from Vishay Semiconductors is a silicon planar Zener diode designed for precise voltage regulation and stabilization in low-power circuits. It delivers a nominal Zener voltage of 24 V at 5 mA test current, with ±1.6 V tolerance (22.8–25.6 V), dynamic resistance of 18 Ω at IZT, and temperature coefficient of +0.04 %/K at 25 °C - enabling stable reference performance in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX55C24-TR datasheet, BZX55C24-TR pinout, BZX55C24-TR application, or BZX55C24-TR equivalent, key selection criteria include its DO-35 package compatibility, 500 mW power rating, < 0.1 μA reverse leakage at rated voltage, low-noise operation, and suitability for precision analog reference and industrial sensor biasing where thermal drift and long-term stability are critical.
Technical Context
The BZX55C24-TR operates as a single-element, two-terminal voltage reference device relying on controlled avalanche breakdown in its doped p-n junction. Its Zener voltage is specified at 5 mA DC test current (IZT1), with guaranteed minimum and maximum limits across production lots to ensure predictable clamping behavior under transient overvoltage conditions.
Thermal design is constrained by a junction-to-ambient thermal resistance of 300 K/W (with 4 mm lead length) and a maximum junction temperature of 175 °C. The device exhibits a positive temperature coefficient (+0.04 %/K at 25 °C, rising to +0.12 %/K at 150 °C), indicating increasing VZ with temperature - a critical factor when used in temperature-sensitive references or compensated circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8–25.6 V (nominal 24 V at 5 mA); defines stable regulation point for feedback or clamp circuits |
| Power Dissipation (Ptot) | 500 mW at TL = 25 °C; sets maximum continuous DC or pulsed power handling before thermal derating |
| Dynamic Resistance (ZZ) | 18 Ω at IZT = 5 mA; determines output impedance and regulation sensitivity to current variation |
| Reverse Leakage (IR) | < 0.1 μA at VR = 20.4 V; ensures minimal quiescent current draw in high-impedance bias networks |
| Temperature Coefficient (TKVZ) | +0.04 %/K at 25 °C; quantifies VZ drift per degree, essential for ambient-compensated designs |
| Junction Temperature (Tj) | 175 °C max; defines upper thermal limit for reliable long-term operation under load |
| Forward Voltage (VF) | 1.5 V max at IF = 200 mA; relevant for polarity-check or dual-function circuit use cases |
Pinout & Package
DO-35 (DO-204AH) glass axial package: hermetically sealed, 2.6 mm diameter body, 3.1 mm minimum length, cathode identified by band. Lead spacing not standardized; intended for through-hole mounting with 4 mm lead length defining thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener mode | Must be held ≤ (VZ − 0.7 V) below cathode to avoid forward conduction during regulation |
| Cathode | Current exit terminal in forward bias; connected to higher-potential node in Zener mode | Marked by color band; serves as regulated output reference point in shunt regulator configurations |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables clean, well-defined knee at 24 V - critical for accurate clamping without soft saturation |
| Low reverse leakage current | < 0.1 μA at 20.4 V ensures negligible loading on high-Z reference nodes and sensor interfaces |
| High long-term stability | Guaranteed parameter drift within spec over life - supports 10+ year reliability in industrial control modules |
| Low noise operation | Minimizes voltage reference jitter in precision ADC biasing and analog front-end applications |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed power supplies and medical auxiliary circuits |
Applications
| Industrial Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived auxiliary supplies for PLC I/O modules. IC Role / Device Role / Timing Role: Shunt voltage reference in optocoupler feedback loop, setting error amplifier threshold. Use Value: Tight 24 V tolerance and +0.04 %/K TC enable ±1% output regulation across –40 to +85 °C ambient range. |
Use Scenario: Protecting microcontroller GPIO pins from ESD-induced transients on 24 V fieldbus lines. IC Role / Device Role / Timing Role: Passive clamp limiting voltage excursion to ≤25.6 V during surge events. Use Value: Sub-μA leakage preserves signal integrity; 18 Ω ZZ ensures fast response to 1 kV/μs transients. |
| Sensor Bias Reference | Calibration Voltage Standard |
|
Use Scenario: Providing excitation voltage to resistive temperature detectors (RTDs) in HVAC control units. IC Role / Device Role / Timing Role: Low-drift, low-noise DC reference source for ratiometric measurement circuits. Use Value: 0.1 μA leakage avoids self-heating errors; low noise prevents ADC quantization uncertainty. |
Use Scenario: Serving as traceable 24 V reference in portable multimeter calibration fixtures. IC Role / Device Role / Timing Role: Primary voltage standard in benchtop test equipment requiring long-term repeatability. Use Value: High stability and MSL Level 1 handling support recalibration intervals exceeding 12 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A-T | Same 24 V nominal rating, but 1 W power rating, TO-204AA (DO-41) package, 25 Ω ZZ | Higher power handling suits higher-current shunt regulators; larger footprint requires PCB redesign | Select when >500 mW dissipation or improved thermal margin is required; not drop-in compatible |
| BZX85C24 | 24 V Zener, 1.3 W rating, DO-41 package, 22 Ω ZZ, higher leakage (≤1 μA) | Designed for higher-power industrial regulators; less suitable for ultra-low-leakage sensor bias | Choose for cost-sensitive, non-critical stabilization where leakage & noise are secondary concerns |
Compared with BZX55C24-TR, the 1N4749A-T offers greater power headroom but sacrifices board space and low-leakage performance, while the BZX85C24 trades precision and noise for ruggedness - making BZX55C24-TR optimal for space-constrained, low-power, high-stability applications.
Availability
BZX55C24-TR is available at Aetrix Electronics and suitable for industrial power supply feedback, overvoltage protection clamp, and sensor bias reference applications requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for BZX55C24-TR 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
Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with emphasis on reliability, precision, and automotive/industrial qualification.
The BZX55-Series is part of Vishay's small-signal Zener diode family engineered for voltage stabilization in compact, cost-sensitive, and thermally constrained applications - particularly where low leakage, sharp knee, and long-term stability are prioritized over high power.
FAQ
What is the Zener voltage tolerance of the BZX55C24-TR?
The BZX55C24-TR has a Zener voltage range of 22.8 V to 25.6 V at 5 mA test current, corresponding to a ±1.6 V absolute tolerance around the nominal 24 V rating. This tolerance is guaranteed across production lots and reflects the "C" grade of the BZX55-Series, which specifies tighter limits than the "B" grade variants.
Can the BZX55C24-TR be used in surface-mount designs?
No - the BZX55C24-TR is packaged exclusively in the DO-35 (DO-204AH) axial glass case, which is a through-hole format. It lacks SMD-compatible terminations or tape-and-reel packaging for pick-and-place assembly. For SMT equivalents, consider Vishay's MM3Z24V or BZX384-B24 series instead.
What is the maximum reverse leakage current for BZX55C24-TR at 20.4 V?
The maximum reverse leakage current (IR) for BZX55C24-TR is specified as < 0.1 μA at VR = 20.4 V and Tamb = 25 °C. This ultra-low leakage supports high-impedance bias networks, such as those found in precision op-amp references or battery-powered sensor interfaces.
How does temperature affect the Zener voltage of BZX55C24-TR?
The BZX55C24-TR exhibits a positive temperature coefficient of +0.04 %/K at 25 °C, increasing to +0.12 %/K at 150 °C. This means its Zener voltage rises approximately 9.6 mV/°C near room temperature - a key consideration when designing temperature-compensated references or predicting regulation shift across operating ranges.
Is the BZX55C24-TR RoHS compliant and halogen-free?
Yes - the BZX55C24-TR complies with RoHS Directive 2011/65/EU and is halogen-free per Vishay's material categorization standard (document 99912). The DO-35 package uses UL 94 V-0 compliant molding compound and lead-free terminations, meeting industrial and medical regulatory requirements.
BZX55C24-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZX55
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 18 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
BZX55C24-TR FAQ
1.How can I place an order for BZX55C24-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C24-TR 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 BZX55C24-TR reliable?
The price and inventory of BZX55C24-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C24-TR is usually 5 days.
3.What payment methods are accepted for BZX55C24-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C24-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C24-TR?
BZX55C24-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C24-TR 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 BZX55C24-TR?
For technical support, including BZX55C24-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C24-TR requirements.
6.How does Aetrix verify that BZX55C24-TR is sourced from the original manufacturer or authorized distributors?
All BZX55C24-TR 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 BZX55C24-TR meets industry standards.
7.What is the process for return or replacement of BZX55C24-TR?
All BZX55C24-TR units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C24-TR, 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 BZX55C24-TR part is unused and in its original packaging.
Return procedure for BZX55C24-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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