My Inquiry
My Account
Nexperia USA Inc. BZX58550-B1V8X
- Part No.:
- BZX58550-B1V8X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B1V8X.pdf
- Description:
- DIODE ZENER 1.8V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:4,498
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX58550-B1V8X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 1.8 V nominal regulation at 50 µA test current, with ±2 % tolerance and 300 mW total power dissipation. It serves as a precision reference or bias voltage source in ultra-low-power circuits such as battery-backed real-time clocks, sensor signal conditioning, and portable IoT node power rails.
For engineers reviewing the BZX58550-B1V8X datasheet, BZX58550-B1V8X pinout, BZX58550-B1V8X application, or BZX58550-B1V8X equivalent, key selection criteria include its 1.8 V nominal Zener voltage, low 50 µA test current, ±2 % tolerance, SOD523 footprint compatibility, and specified leakage behavior for noise-sensitive analog front-ends.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-bias voltage across its cathode–anode terminals when reverse current exceeds the knee threshold. Its Zener breakdown mechanism delivers predictable regulation at low currents, with differential resistance ≤600 Ω at IZ = 50 µA and temperature coefficient of −3.5 mV/K.
The BZX58550-B1V8X is optimized for low-bias operation: it achieves regulation at just 50 µA, exhibits forward voltage ≤0.9 V at 10 mA, and features intentional minor leakage rise to reduce switching noise-confirmed in application note AN90031 for fast-transient applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 1.8 V at IZ = 50 µA - defines precise low-voltage reference point for biasing or sensing |
| Tolerance | ±2 % - ensures tight voltage accuracy critical for calibration-critical analog stages |
| Test Current | 50 µA - enables stable regulation in micro-power systems where supply current is constrained |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - sets thermal design boundary for compact layouts |
| Forward Voltage | ≤0.9 V at IF = 10 mA - limits conduction loss during forward-biased protection or clamping use |
| Differential Resistance | ≤600 Ω at IZ = 50 µA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient | −3.5 mV/K - quantifies voltage drift over temperature, enabling compensation in precision references |
Pinout & Package
Package: SOD523 (SC-79), ultra-small surface-mount plastic package measuring 1.2 mm × 0.8 mm × 0.6 mm, with flat leads and cathode marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal; carries reverse current during regulation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes shunt path for Zener current flow |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Regulates stably at 50 µA - supports energy harvesting and coin-cell-powered designs |
| Tight voltage tolerance | ±2 % - reduces need for post-calibration in factory-trimmed sensor modules |
| Optimized leakage profile | Intentional minor rise per AN90031 - suppresses high-frequency noise in ADC reference paths |
| Ultra-compact SMD package | SOD523 footprint - saves board space in wearables and miniaturized medical sensors |
| Controlled thermal resistance | Rth(j-a) = 350 K/W with 35 mm² cathode copper - enables predictable derating in thermally constrained enclosures |
Applications
| Portable Sensor Biasing | RTC Backup Voltage Reference |
|---|---|
Use Scenario: Providing stable 1.8 V bias to MEMS accelerometer analog front-end in Bluetooth LE wearable. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precision reference for internal ADC and signal chain. Use Value: Enables consistent sensor offset calibration across temperature (−3.5 mV/K TC) and extends coin-cell life via 50 µA regulation current. |
Use Scenario: Supplying regulated 1.8 V to real-time clock IC during main power loss in smart meter design. IC Role / Device Role / Timing Role: Low-leakage Zener clamp maintaining RTC VDD within spec during backup mode. Use Value: Prevents timekeeping drift under brown-out by delivering stable voltage with <1 µA IR at VR = 1.5 V. |
| Low-Power Microcontroller Reset Circuit | IoT Node RF Front-End Bias |
Use Scenario: Generating clean 1.8 V reset threshold for ARM Cortex-M0+ MCU in battery-operated environmental monitor. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator-based reset generator. Use Value: Guarantees deterministic reset assertion at 1.8 V ±36 mV, eliminating false triggers from supply ripple. |
Use Scenario: Biasing LNA input stage in sub-GHz LoRa transceiver module powered by single alkaline cell. IC Role / Device Role / Timing Role: Low-noise shunt regulator supplying clean DC bias to RF amplifier transistor base. Use Value: Reduces phase noise via intentional leakage optimization (AN90031), improving receiver sensitivity by 1.2 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-current Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5221BS | 1.8 V, ±5 % tolerance, 200 mW Ptot, SOT-23 package (2.9 mm × 1.3 mm) | Larger footprint and looser tolerance limit use in space-constrained, high-accuracy designs | Choose only if SOT-23 assembly infrastructure exists and ±5 % regulation error is acceptable. |
| Vishay PLZ1.8B | 1.8 V, ±2 %, 250 mW Ptot, SOD-323 package (1.7 mm × 1.3 mm) | Higher thermal resistance (400 K/W) and 100 µA test current increase quiescent power vs. BZX58550-B1V8X | Select when legacy SOD-323 placement is mandated and 50 µA operation is not required. |
Compared with MMBZ5221BS and PLZ1.8B, the BZX58550-B1V8X uniquely combines ±2 % tolerance, 50 µA test current, and SOD523 size-enabling higher accuracy, lower system power, and denser PCB layouts in next-generation ultra-low-power edge devices.
Availability
BZX58550-B1V8X is available at Aetrix Electronics and suitable for portable sensor biasing, RTC backup reference, low-power MCU reset circuits, and IoT RF front-end biasing requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX58550-B1V8X 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 essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX58550 series belongs to Nexperia's precision low-current Zener regulator product line, engineered specifically for ultra-low-power analog reference and bias applications in battery-constrained and miniaturized electronic systems.
FAQ
What is the maximum reverse current the BZX58550-B1V8X can sustain continuously?
The device supports continuous reverse current up to 200 mA per Absolute Maximum Ratings (Table 5), but sustained operation must respect power derating: at 25 °C ambient with 35 mm² cathode copper, max dissipation is 300 mW, limiting practical Zener current to ≈167 mA at 1.8 V. Exceeding this risks thermal runaway due to negative temperature coefficient below 5 V.
Does the BZX58550-B1V8X meet AEC-Q200 for automotive use?
No. The BZX58550-B1V8X is not automotive-qualified. Nexperia explicitly states in Section 14 that non-automotive qualified products are unsuitable for automotive applications unless expressly stated. This part lacks AEC-Q200 stress testing, extended temperature validation, and automotive-grade traceability.
How does the "intentional minor rise of leakage current" improve performance?
Per AN90031, this controlled leakage enhancement reduces high-frequency noise and improves transient response during fast switching events. It lowers dynamic impedance near the Zener knee, minimizing voltage perturbation when load current changes rapidly-critical in ADC reference buffers and RF bias networks.
Can the BZX58550-B1V8X be used in forward conduction mode?
Yes, but only as a low-drop rectifier or ESD clamp: forward voltage is ≤0.9 V at 10 mA (Table 1), and absolute maximum forward current is 200 mA. However, it is not optimized for forward conduction-its primary function and characterization are for reverse-bias Zener regulation at 50 µA.
BZX58550-B1V8X 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):
- 1.8 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1 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-B1V8X FAQ
1.How can I place an order for BZX58550-B1V8X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B1V8X 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-B1V8X reliable?
The price and inventory of BZX58550-B1V8X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B1V8X is usually 5 days.
3.What payment methods are accepted for BZX58550-B1V8X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B1V8X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B1V8X?
BZX58550-B1V8X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B1V8X 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-B1V8X?
For technical support, including BZX58550-B1V8X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B1V8X requirements.
6.How does Aetrix verify that BZX58550-B1V8X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B1V8X 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-B1V8X meets industry standards.
7.What is the process for return or replacement of BZX58550-B1V8X?
All BZX58550-B1V8X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B1V8X, 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-B1V8X part is unused and in its original packaging.
Return procedure for BZX58550-B1V8X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B1V8X 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…
