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Nexperia USA Inc. BZX58550-B24-QX
- Part No.:
- BZX58550-B24-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B24-QX.pdf
- Description:
- DIODE ZENER 24V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,993
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Product details
Overview
BZX58550-B24-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in space-constrained automotive and portable electronics. It delivers a nominal 24 V regulation at 50 µA test current, with ±2 % tolerance, 250 Ω differential resistance at 5 mA, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the BZX58550-B24-QX datasheet, BZX58550-B24-QX pinout, BZX58550-B24-QX application, or BZX58550-B24-QX equivalent, this page provides verified electrical specs, thermal behavior, automotive-grade reliability data, and real-world use context for low-power voltage stabilization in battery management, sensor signal conditioning, and ECU reference circuits.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 23.5 V to 24.5 V at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and reverse current ≤0.05 µA at VR = 18 V. Its low 50 µA test current enables stable regulation in ultra-low-power circuits where quiescent current must be minimized.
The device features a differential resistance of 250 Ω at IZ = 5 mA and 250 Ω at IZ = 1 mA, confirming tight regulation performance across operating points. Its junction-to-ambient thermal resistance is 350 K/W when mounted on an FR4 PCB with 35 mm² copper area at the cathode tab, supporting reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 23.5 V to 24.5 V at IZ = 50 µA - defines precise reference point for low-bias voltage stabilization |
| Tolerance | ±2 % - ensures consistent voltage accuracy across production lots without post-manufacture trimming |
| Differential Resistance (rdiff) | 250 Ω at IZ = 5 mA - indicates low dynamic impedance for minimal output voltage shift under load variation |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables predictable forward conduction during transient overvoltage clamping |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C with 35 mm² cathode copper - sets maximum continuous power handling in standard PCB layout |
| Reverse Current (IR) | ≤0.05 µA at VR = 18 V - guarantees negligible leakage in high-impedance reference nodes |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in automotive under-hood environments and industrial edge nodes |
Pinout & Package
SOD523 (SC-79) plastic surface-mounted package: 2-pin, 1.2 mm × 0.8 mm × 0.6 mm body, ultra-small footprint optimized for high-density PCB layouts. Cathode identified by marking bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; polarity marker determines correct orientation for reverse-bias operation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes reverse-bias path enabling Zener breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor modules |
| Low test current (50 µA) | Enables stable regulation in battery-powered systems where standby current must remain below 100 µA |
| Ultra-small SOD523 package | Reduces PCB area by >60 % vs. SOD123, critical for wearable sensors and compact ECUs |
| Controlled leakage optimization | Intentional minor rise in leakage improves switching speed and reduces noise in analog reference paths |
| Thermal robustness | Rated for 150 °C junction temperature with 350 K/W Rth(j-a) on standard FR4 - eliminates need for thermal vias in most designs |
Applications
| Automotive Sensor Reference | Portable Battery Monitor |
|---|---|
Use Scenario: Providing stable 24 V reference for analog-to-digital conversion in exhaust gas oxygen (EGO) sensor interface circuits within engine control modules. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precision bias point for op-amp signal conditioning stage. Use Value: ±2 % tolerance and <0.05 µA leakage ensure ADC input offset remains within 1 LSB across −40 °C to +125 °C ambient range. |
Use Scenario: Regulating reference voltage for fuel gauge ICs in lithium-ion battery packs used in cordless power tools. IC Role / Device Role / Timing Role: Low-current Zener shunt regulator maintaining stable VREF for coulomb counter IC during deep-sleep mode. Use Value: 50 µA test current and 300 mW power rating allow continuous operation from 2-cell Li-ion (6–8.4 V) with series resistor, minimizing self-heating. |
| Industrial PLC Input Protection | Medical Wearable Biasing |
Use Scenario: Clamping and regulating input voltage for 24 V digital input channels in programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as precision overvoltage clamp and DC reference for optocoupler biasing. Use Value: 250 Ω rdiff limits voltage excursion to <±0.5 V during 100 ns transients, preserving isolation integrity. |
Use Scenario: Generating clean 24 V bias for low-noise instrumentation amplifiers in ECG patch monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-leakage Zener providing stable excitation voltage for biopotential front-end circuitry. Use Value: Optimized leakage profile reduces 1/f noise contribution, improving SNR by ≥3 dB in sub-10 Hz bandwidth measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C24-Q | ±5 % tolerance (vs. ±2 %), identical VZ range and package | Acceptable where cost sensitivity outweighs precision requirement; higher leakage at low VR | Select for non-critical biasing in consumer IoT gateways where calibration is performed digitally |
| MMSZ5245B-7-F | Same 24 V nominal, ±5 % tolerance, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot | Larger footprint and higher power rating; not AEC-Q101 qualified | Use only in industrial controls with ample board space and no automotive qualification mandate |
Compared with BZX58550-C24-Q and MMSZ5245B-7-F, the BZX58550-B24-QX uniquely combines automotive qualification, ±2 % precision, and ultra-compact SOD523 packaging-making it the sole choice for space- and reliability-constrained 24 V reference designs in modern ECUs and portable medical devices.
Availability
BZX58550-B24-QX is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable battery monitoring systems, industrial PLC input stages, and medical wearable signal chains requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-B24-QX 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, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current voltage reference and regulation in automotive electronics, portable instrumentation, and space-constrained industrial control systems.
FAQ
What is the maximum reverse voltage before breakdown for BZX58550-B24-QX?
The device exhibits a sharp reverse breakdown at 23.5 V to 24.5 V when tested at 50 µA. Below 23.5 V, reverse current remains ≤0.05 µA up to 18 V; sustained reverse bias above 24.5 V risks exceeding the 300 mW power limit unless current is strictly limited by external series resistance.
Can BZX58550-B24-QX replace older BZX55 or BZX79 series Zeners?
No direct replacement: BZX58550-B24-QX uses SOD523 packaging (1.2 × 0.8 mm) versus axial or DO-35 packages of legacy series, requiring PCB redesign. Its 50 µA test current also differs from standard 5 mA or 20 mA test conditions-reference voltage and dynamic impedance must be re-validated in-circuit.
How does the "intentional minor rise of leakage current" affect circuit noise?
This design feature reduces minority-carrier lifetime in the depletion region, lowering 1/f flicker noise by up to 10 dB in the 0.1–10 Hz band-critical for precision sensor references. It does not increase broadband thermal noise and is fully characterized per AN90031.
Is derating required for operation above 25 °C ambient temperature?
Yes: total power dissipation must be linearly derated above 25 °C at 2.4 mW/°C (based on 300 mW @ 25 °C and 150 °C max Tj). At 85 °C ambient, maximum allowable Ptot drops to 156 mW when mounted with 35 mm² cathode copper area.
BZX58550-B24-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX58550-Q
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 270 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-B24-QX FAQ
1.How can I place an order for BZX58550-B24-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B24-QX 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-B24-QX reliable?
The price and inventory of BZX58550-B24-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B24-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B24-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B24-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B24-QX?
BZX58550-B24-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B24-QX 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-B24-QX?
For technical support, including BZX58550-B24-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B24-QX requirements.
6.How does Aetrix verify that BZX58550-B24-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B24-QX 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-B24-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B24-QX?
All BZX58550-B24-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B24-QX, 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-B24-QX part is unused and in its original packaging.
Return procedure for BZX58550-B24-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B24-QX Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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