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Nexperia USA Inc. BZX58550-C24X
- Part No.:
- BZX58550-C24X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C24X.pdf
- Description:
- DIODE ZENER 24V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:9,901
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Product details
Overview
BZX58550-C24X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing precise 24 V nominal regulation at 50 µA test current with ±2 % tolerance, 250 Ω differential resistance at 5 mA, and 0.05 µA reverse leakage at rated voltage - optimized for battery-powered sensor biasing and low-power reference circuits.
For engineers reviewing the BZX58550-C24X datasheet, BZX58550-C24X pinout, BZX58550-C24X application, or BZX58550-C24X equivalent, key selection criteria include its ultra-low test current specification, tight voltage tolerance, thermal resistance of 350 K/W on standard PCB layout, and intentional minor leakage optimization for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal working voltage of 24 V (22.8 V min / 25.2 V max), specified at IZ = 50 µA to ensure stable regulation under micro-power conditions. Its differential resistance remains ≤250 Ω at 5 mA, supporting predictable impedance behavior across load variations.
The device features an intentionally elevated leakage current profile per AN90031 to reduce switching transients and high-frequency noise - distinct from standard Zeners - while maintaining junction temperature limits up to 150 °C and total power dissipation capped at 300 mW on FR4 PCB with 35 mm² cathode copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 24 V (22.8 V to 25.2 V range); enables precise mid-rail voltage reference in 3.3 V/5 V/24 V mixed-supply systems |
| Tolerance | ±2 %; supports tight regulation without post-production trimming in portable instrumentation |
| Test Current | 50 µA; allows stable operation in nanoampere-bias circuits such as CMOS reset monitors and IoT sensor wake-up references |
| Differential Resistance | ≤250 Ω at IZ = 5 mA; ensures minimal output voltage shift under small load current changes |
| Reverse Leakage | ≤0.05 µA at VR = 24 V; contributes to ultra-low standby power in always-on monitoring nodes |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode Cu; defines maximum continuous DC power handling in compact layouts |
| Package | SOD523 (SC-79); 1.2 mm × 0.8 mm × 0.6 mm footprint ideal for space-constrained wearables and medical patches |
Pinout & Package
Supplied in ultra-small SOD523 (SC-79) plastic surface-mount package with flat lead profile and cathode band marking. Dimensions: 1.25 mm (L) × 0.85 mm (W) × 0.65 mm (H); cathode tab thermal pad enhances heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marked by bar on package; primary heat path to PCB copper area |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in sub-1 µA standby circuits without compromising regulation accuracy |
| Tight voltage tolerance | ±2 % over temperature - eliminates need for external calibration in precision voltage monitor ICs |
| Optimized leakage profile | Intentional minor IR increase per AN90031 - reduces high-frequency noise and improves transient response in ADC reference paths |
| Ultra-compact packaging | SOD523 footprint (1.2 × 0.8 mm) - saves >60 % board area vs. SOD323 in wearable ECG and pulse oximeter designs |
| Thermal performance | 350 K/W Rth(j-a) on standard FR4 - supports reliable operation at 85 °C ambient in sealed industrial sensors |
Applications
| Portable Sensor Biasing | Low-Power Reset Monitoring |
|---|---|
|
Use Scenario: Providing stable 24 V reference for MEMS pressure sensor excitation in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Zener voltage regulator supplying fixed bias voltage to sensor bridge, replacing larger LDOs where quiescent current must stay below 100 nA. Use Value: Enables 10-year battery life via 50 µA test current compliance and <0.05 µA leakage at operating voltage. |
Use Scenario: Generating threshold voltage for microcontroller POR (power-on reset) circuit in asset-tracking tags. IC Role / Device Role / Timing Role: Precision shunt reference defining reset release point during 3.3 V rail ramp-up. Use Value: ±2 % tolerance ensures deterministic reset timing across temperature without trimming resistors. |
| IoT Node Reference Supply | Medical Patch Signal Conditioning |
|
Use Scenario: Supplying clean 24 V reference to op-amp gain-setting network in LoRaWAN gas sensor frontend. IC Role / Device Role / Timing Role: Low-noise voltage reference stabilizing transimpedance amplifier feedback path. Use Value: Intentionally elevated leakage per AN90031 suppresses switching noise coupling into µV-level analog signals. |
Use Scenario: Regulating bias for photodiode TIA in disposable pulse oximeter patches. IC Role / Device Role / Timing Role: Compact shunt regulator establishing stable common-mode voltage for analog signal chain. Use Value: SOD523 size fits within 8 mm × 8 mm PCB area constraint while delivering 24 V ±2 % accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-B24 | Same 24 V nominal voltage but ±5 % tolerance (vs. ±2 % for C-series); higher leakage variability | Acceptable where cost sensitivity outweighs precision; unsuitable for calibrated medical sensors | Select when budget constraints dominate and system-level calibration compensates for wider tolerance |
| MMSZ5245B | 24 V Zener in SOD-123; 500 mW rating; 300 Ω rdiff; no intentional leakage optimization | Larger footprint (3.7 × 1.6 mm); higher thermal resistance (400+ K/W); higher noise floor | Choose only if legacy SOD-123 layout reuse is mandatory and noise performance is secondary |
Compared with BZX58550-B24 and MMSZ5245B, the BZX58550-C24X delivers superior voltage accuracy, lower thermal resistance, and purpose-built low-noise leakage characteristics - making it the optimal choice for next-generation compact, battery-critical analog systems requiring both precision and silence.
Availability
BZX58550-C24X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power reset monitoring, and IoT node reference supply requiring stable component supply with guaranteed long-term continuity and traceable sourcing.
Supply support for BZX58550-C24X 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands, with manufacturing in Europe and Asia.
The BZX58550 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power analog reference and biasing in battery-constrained edge devices - not general-purpose regulation.
FAQ
What is the maximum continuous power dissipation for BZX58550-C24X at 85 °C ambient?
At 85 °C ambient, the derated power dissipation is 225 mW, calculated using the 300 mW rating at 25 °C and thermal resistance of 350 K/W on FR4 with 35 mm² cathode copper. This ensures safe operation without exceeding 150 °C junction temperature under sustained load.
Can BZX58550-C24X replace a standard 24 V Zener in existing SOD-123 footprints?
No - BZX58550-C24X uses SOD523 (1.2 mm × 0.8 mm), which is physically incompatible with SOD-123 (3.7 mm × 1.6 mm) land patterns. Mechanical redesign is required; electrical substitution alone is insufficient due to differing thermal and noise characteristics.
How does the "intentional minor rise of leakage current" improve performance?
Per AN90031, this controlled leakage reduces minority-carrier recombination noise and suppresses high-frequency oscillations during transient events - directly improving SNR in precision ADC reference buffers and low-noise op-amp bias networks.
Is BZX58550-C24X suitable for automotive applications?
No - this device is not AEC-Q200 qualified, lacks automotive-grade screening, and is explicitly designated for industrial and consumer portable electronics. Nexperia provides separate automotive-qualified Zener families (e.g., PZU series) for vehicular use.
BZX58550-C24X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-C24X FAQ
1.How can I place an order for BZX58550-C24X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C24X 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 BZX58550-C24X reliable?
The price and inventory of BZX58550-C24X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-C24X is usually 5 days.
3.What payment methods are accepted for BZX58550-C24X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C24X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C24X?
BZX58550-C24X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C24X 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 BZX58550-C24X?
For technical support, including BZX58550-C24X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C24X requirements.
6.How does Aetrix verify that BZX58550-C24X is sourced from the original manufacturer or authorized distributors?
All BZX58550-C24X 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 BZX58550-C24X meets industry standards.
7.What is the process for return or replacement of BZX58550-C24X?
All BZX58550-C24X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C24X, 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 BZX58550-C24X part is unused and in its original packaging.
Return procedure for BZX58550-C24X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C24X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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