My Inquiry
My Account
Nexperia USA Inc. BZX58550-B24X
- Part No.:
- BZX58550-B24X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B24X.pdf
- Description:
- DIODE ZENER 24V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:9,385
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX58550-B24X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, rated for 24 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 250 Ω differential resistance at 5 mA - used for precision biasing and voltage reference in portable battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZX58550-B24X datasheet, BZX58550-B24X pinout, BZX58550-B24X application, or BZX58550-B24X equivalent, this page delivers verified electrical specs, thermal behavior under PCB copper area constraints, cathode/anode terminal mapping, and real-world use cases in ultra-low-quiescent-current systems where leakage and noise sensitivity are critical.
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 = 18.4 V. Its low 50 µA test current enables stable regulation in sub-100 µA bias networks.
The device features intentional minor leakage rise per AN90031 to reduce switching noise and improve transient response in low-current feedback paths; its 22 pF capacitance at 0 V and 18.2 Ω dynamic impedance at 5 mA support clean DC reference generation without high-frequency coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 24 V at IZ = 50 µA - defines precise DC reference point for low-bias analog monitoring circuits |
| Voltage Tolerance | ±2 % - ensures tight regulation window for reset threshold accuracy in 3.3 V MCU systems |
| Differential Resistance | 250 Ω at IZ = 5 mA - determines output impedance and load regulation error under small-signal variations |
| Forward Voltage | 0.9 V at IF = 10 mA - limits conduction loss when used in dual-direction clamp configurations |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode Cu - sets maximum continuous bias current to ~12.5 mA at 24 V |
| Junction Temperature Limit | 150 °C - constrains thermal design margin for sealed battery compartments with limited airflow |
| Reverse Current | ≤ 0.05 µA at VR = 18.4 V - enables nanoampere-level standby current in always-on wake-up circuits |
Pinout & Package
Package: SOD523 (SC-79), plastic surface-mounted, 2-lead, 1.2 mm × 0.8 mm × 0.6 mm body; marking bar denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; polarity-sensitive for correct reverse-bias operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reference sink path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low test current | 50 µA - enables stable Zener operation in energy-harvesting and coin-cell-powered systems |
| Controlled leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and improves noise immunity in ADC reference paths |
| Tight voltage tolerance | ±2 % - eliminates need for external trimming in factory-calibrated sensor signal chains |
| Miniature SOD523 footprint | 1.2 mm × 0.8 mm - supports high-density layout in wearables and IoT edge nodes with strict board area limits |
| Thermal resistance | 350 K/W (junction-to-ambient, 35 mm² Cu) - allows predictable derating in thermally constrained PCBs |
Applications
| Portable Sensor Biasing | MCU Reset Reference |
|---|---|
|
Use Scenario: Providing stable 24 V reference for analog front-end amplifiers in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Zener voltage regulator establishing fixed bias point for op-amp input stages and ADC reference dividers. Use Value: Enables <1 µA quiescent current in active sensing mode while maintaining ±0.5 % reference stability across −40 °C to +85 °C. |
Use Scenario: Generating precise reset threshold for 3.3 V microcontrollers in industrial telemetry modules. IC Role / Device Role / Timing Role: Reverse-biased Zener in RC-based power-on reset circuit, defining accurate trip voltage for POR logic. Use Value: Delivers 24 V regulation tolerance matched to reset IC hysteresis requirements, eliminating external resistor calibration. |
| Low-Power RF Transceiver Reference | IoT Edge Node Voltage Clamp |
|
Use Scenario: Supplying clean local reference to LNA bias networks in sub-GHz LoRaWAN transceivers. IC Role / Device Role / Timing Role: Low-noise Zener shunt regulator decoupling RF supply rails from digital switching noise. Use Value: 22 pF capacitance and optimized leakage reduce broadband phase noise contribution below −140 dBc/Hz at 100 kHz offset. |
Use Scenario: Protecting GPIO inputs against ESD-induced overvoltage in battery-powered smart meters. IC Role / Device Role / Timing Role: Bidirectional clamp (anode-to-rail, cathode-to-VDD) limiting transient excursions to ±0.9 V forward / 24 V reverse. Use Value: Combines 0.9 V forward conduction with 24 V Zener clamping to meet IEC 61000-4-2 Level 4 without series resistance penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C24 | ±5 % tolerance vs. ±2 %; identical 24 V nominal, same SOD523 package and thermal specs | Acceptable where reset threshold or bias accuracy tolerances exceed ±0.5 V | Select for cost-sensitive designs where tighter voltage binning is unnecessary |
| MMSZ5245B | 24 V ±5 %, 500 mW rating, SOD-123 package (2.7 mm × 1.4 mm), higher rdiff (350 Ω) | Requires larger PCB area; suited for higher-power bias but less optimal for space-constrained IoT nodes | Choose only if thermal headroom >300 mW is required and board space permits larger footprint |
Compared with BZX58550-C24, the BZX58550-B24X offers tighter voltage control essential for precision analog thresholds; versus MMSZ5245B, it trades power headroom for 55 % smaller footprint and lower dynamic impedance - critical for miniaturized, low-IQ systems.
Availability
BZX58550-B24X is available at Aetrix Electronics and suitable for portable sensor biasing, MCU reset reference generation, low-power RF transceiver referencing, and IoT edge node voltage clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-B24X 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and robustness for high-volume electronics.
The BZX58550 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for ultra-low-quiescent-current applications including battery-powered sensing, wearable health monitors, and energy-harvesting subsystems.
FAQ
What is the maximum continuous reverse current the BZX58550-B24X can sustain without exceeding its thermal limit?
At ambient temperature ≤25 °C on an FR4 PCB with 35 mm² copper at the cathode tab, the device sustains up to 12.5 mA continuous reverse current (24 V × 12.5 mA = 300 mW). Derating is required above 25 °C per its 350 K/W junction-to-ambient thermal resistance - e.g., at 60 °C ambient, max current drops to ~8.6 mA to hold Tj ≤150 °C.
How does the BZX58550-B24X differ from standard 24 V Zeners like the 1N4749A in low-current operation?
Unlike the 1N4749A (rated at 20 mA test current), the BZX58550-B24X is specified at 50 µA - enabling stable regulation down to nanoampere bias networks. It also features lower dynamic impedance (250 Ω vs. 35 Ω at 20 mA, but 750 Ω at 50 µA for 1N4749A) and intentional leakage optimization per AN90031 for reduced noise in sensitive analog paths.
Can the BZX58550-B24X be used in forward conduction mode, and what is its typical forward voltage?
Yes - it functions as a standard silicon diode in forward bias. At IF = 10 mA, forward voltage is guaranteed ≤0.9 V (pulse-tested, tp ≤300 µs). This enables dual-role use in bidirectional clamping circuits where the anode connects to a protected line and cathode to VDD, limiting both positive and negative transients.
Is the SOD523 package of the BZX58550-B24X compatible with standard reflow profiles for lead-free assembly?
Yes - Nexperia qualifies the SOD523 package for JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature up to 260 °C. The recommended solder land pattern (Fig. 10) uses 0.5 mm pad width, 1.4 mm length, and 0.4 mm solder mask opening - matching industry-standard stencil designs for 0201-class components.
BZX58550-B24X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX58550
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-B24X FAQ
1.How can I place an order for BZX58550-B24X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B24X 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-B24X reliable?
The price and inventory of BZX58550-B24X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B24X is usually 5 days.
3.What payment methods are accepted for BZX58550-B24X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B24X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B24X?
BZX58550-B24X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B24X 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-B24X?
For technical support, including BZX58550-B24X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B24X requirements.
6.How does Aetrix verify that BZX58550-B24X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B24X 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-B24X meets industry standards.
7.What is the process for return or replacement of BZX58550-B24X?
All BZX58550-B24X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B24X, 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-B24X part is unused and in its original packaging.
Return procedure for BZX58550-B24X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B24X 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
