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onsemi BZX55C24_T50A
- Part No.:
- BZX55C24_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C24_T50A.pdf
- Description:
- DIODE ZENER 24V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,442
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Product details
Overview
BZX55C24_T50A from ON Semiconductor (formerly Fairchild) is a 24 V ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 80 Ω dynamic impedance at 5 mA test current and 0.1 μA maximum reverse leakage at 19.2 V. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX55C24_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, cathode identification via band marking, and compatibility with through-hole PCB layouts requiring DO-35 footprint compliance.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 24 V nominal zener voltage is specified at 5 mA test current with ±5% tolerance, and it maintains stable regulation across -65°C to +200°C operating temperature range.
The DO-35 package features axial leads with cathode indicated by a color band; forward voltage is ≤1.3 V at 100 mA, and maximum zener current is 18 mA at 24 V under worst-case thermal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 25.6 V max at IZ = 5 mA - defines regulation window for precision biasing |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating |
| Dynamic Impedance (ZZ) | 80 Ω @ IZ = 5 mA - indicates voltage stability under small-signal load variation |
| Reverse Leakage (IR) | 0.1 μA @ VR = 19.2 V - ensures minimal quiescent current in standby protection circuits |
| Max Zener Current (IZM) | 18 mA - determines absolute current limit before exceeding PD derating curve |
| Operating Temp Range | -65°C to +200°C - supports deployment in automotive under-hood and industrial high-temp environments |
Pinout & Package
DO-35 glass axial-leaded package with cathode identified by a single color band on the body. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher potential side during voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive designs |
| DO-35 glass package | Provides hermetic sealing and stable long-term parametric drift under thermal cycling |
| 500 mW power rating | Supports direct replacement of legacy 1N4749A in existing 24 V reference schematics |
| Low 0.1 μA leakage at 80% VZ | Minimizes error in high-impedance feedback networks and battery-backed circuits |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Clamp in Sensor Interfaces |
|---|---|
Use Scenario: Stable 24 V reference for rail-to-rail op-amp biasing in industrial analog signal conditioning. IC Role / Device Role / Timing Role: Zener diode providing fixed reference node independent of supply ripple. Use Value: 80 Ω ZZ ensures <10 mV output shift under 100 μA load variation, maintaining ADC accuracy. | Use Scenario: Clamping transient spikes on 24 V sensor supply lines exposed to ESD or inductive kickback. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting excess energy to ground when VIN exceeds 25.6 V. Use Value: 500 mW rating allows absorption of 100 ms pulses up to 200 mJ without degradation. |
| Power Supply Feedback Divider | Microcontroller Reset Circuit |
Use Scenario: Setting regulated output voltage in isolated DC-DC converter feedback loop. IC Role / Device Role / Timing Role: Precision voltage node defining upper threshold of optocoupler-driven error amplifier. Use Value: ±5% tolerance enables ±1% output regulation without external trimming resistors. | Use Scenario: Generating clean reset signal for 3.3 V microcontrollers powered from 24 V industrial bus. IC Role / Device Role / Timing Role: Zener-based level translator and noise filter feeding RC delay into reset pin. Use Value: 0.1 μA leakage prevents capacitor discharge during 10 s watchdog timeout periods. |
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 24 V nominal, but ±10% tolerance and 70 Ω ZZ; DO-41 package (larger footprint) | Less precise regulation; requires PCB layout change due to longer lead spacing | Select when cost priority outweighs voltage accuracy and board space constraints |
| MMSZ5249B | Same 24 V nominal, ±5% tolerance, SOD-123 surface-mount package; 500 mW rating | Not compatible with through-hole assembly; requires reflow-compatible layout | Select for space-constrained PCBs where automated placement is preferred over manual insertion |
Compared with 1N4749A and MMSZ5249B, BZX55C24_T50A delivers tighter voltage tolerance than the former and maintains through-hole manufacturability unlike the latter-making it optimal for legacy-replacement and mixed-technology industrial boards.
Availability
BZX55C24_T50A is available at Aetrix Electronics and suitable for industrial control panels, sensor signal conditioning modules, and 24 V DC power supply feedback networks requiring stable component supply across multi-year production cycles.
Supply support for BZX55C24_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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, communications, computing, and consumer electronics.
The BZX55 series was designed as a general-purpose, cost-optimized Zener diode family for voltage regulation and transient suppression in non-critical, medium-reliability applications.
FAQ
What is the exact zener voltage range for BZX55C24_T50A at 5 mA test current?
The BZX55C24_T50A has a guaranteed zener voltage range of 22.8 V minimum to 25.6 V maximum when measured at 5 mA test current and 25°C ambient temperature, per the Fairchild BZX55C2V4–BZX55C56 datasheet Rev. D1. This ±5% tolerance reflects the device's classification as a "C" grade Zener diode. The BZX55C24_T50A specification sheet confirms these limits apply directly to this part number.
Does BZX55C24_T50A have a defined cathode marking, and how is it identified?
Yes, BZX55C24_T50A uses a single color band on the glass body to denote the cathode terminal, consistent with DO-35 package standards. The band is positioned adjacent to the cathode lead, and the anode is the unmarked lead. This marking is verified in the top-marking diagram on page 2 of the official datasheet, which explicitly shows the cathode band orientation for all BZX55Cxx variants including BZX55C24_T50A.
What is the maximum allowable junction temperature for BZX55C24_T50A?
The BZX55C24_T50A has a maximum junction temperature (TJ) of +200°C, matching its storage temperature limit. This rating is specified in the Absolute Maximum Ratings table of the datasheet and applies under steady-state conditions with proper lead temperature control (TL ≤ 75°C). Derating begins at 4.0 mW/°C above 75°C ambient, ensuring safe operation within the full -65°C to +200°C range. The BZX55C24_T50A datasheet confirms this thermal envelope applies to the entire BZX55C series.
Can BZX55C24_T50A be used in place of 1N4749A without circuit modification?
BZX55C24_T50A can replace 1N4749A electrically but requires mechanical verification: both are 24 V Zeners with 500 mW rating, but BZX55C24_T50A uses DO-35 (2.5 mm diameter, 4.5 mm length), while 1N4749A uses DO-41 (2.7 mm × 5.2 mm). Lead spacing differs, so PCB footprint must match DO-35. The BZX55C24_T50A offers tighter ±5% tolerance versus ±10% for 1N4749A, improving regulation accuracy without schematic changes.
What is the forward voltage specification for BZX55C24_T50A?
The forward voltage (VF) of BZX55C24_T50A is specified as ≤1.3 V at IF = 100 mA, per the "Electrical Characteristics" table on page 2 of the datasheet. This parameter applies when the device is operated in forward conduction mode-not during normal Zener regulation-and is relevant for polarity-check circuits or dual-use protection schemes. The BZX55C24_T50A shares this VF spec with the full BZX55C family.
BZX55C24_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±6%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 18 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX55C24_T50A FAQ
1.How can I place an order for BZX55C24_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C24_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 BZX55C24_T50A reliable?
The price and inventory of BZX55C24_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C24_T50A is usually 5 days.
3.What payment methods are accepted for BZX55C24_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C24_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C24_T50A?
BZX55C24_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C24_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 BZX55C24_T50A?
For technical support, including BZX55C24_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C24_T50A requirements.
6.How does Aetrix verify that BZX55C24_T50A is sourced from the original manufacturer or authorized distributors?
All BZX55C24_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 BZX55C24_T50A meets industry standards.
7.What is the process for return or replacement of BZX55C24_T50A?
All BZX55C24_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C24_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 BZX55C24_T50A part is unused and in its original packaging.
Return procedure for BZX55C24_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX55C24_T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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