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Nexperia USA Inc. BZX58550-C1V8X
- Part No.:
- BZX58550-C1V8X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C1V8X.pdf
- Description:
- DIODE ZENER 1.8V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,205
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Product details
Overview
BZX58550-C1V8X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 1.8 V regulation at 50 µA test current, with ±5 % tolerance, 600 Ω differential resistance at 5 mA, and 220 pF capacitance at 0 V - optimized for portable battery-powered sensor nodes and wearables.
For engineers reviewing the BZX58550-C1V8X datasheet, BZX58550-C1V8X pinout, BZX58550-C1V8X application, or BZX58550-C1V8X equivalent, this page provides verified electrical specs, thermal behavior on FR4 PCBs, cathode/anode terminal mapping, and real-world use cases in energy-constrained analog front-ends and microcontroller reset circuits.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable 1.8 V output across load variations by conducting reverse current above its breakdown threshold. Its specified 50 µA test current enables accurate modeling in sub-100 µA bias networks where traditional Zeners draw excessive quiescent current.
The C-series variant features intentional leakage current optimization per AN90031, reducing switching noise and improving transient response in low-frequency reference paths. Thermal resistance to ambient is 350 K/W when mounted with 35 mm² copper at the cathode tab - critical for predicting junction temperature rise in compact layouts.
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 ADC references or LDO feedback dividers |
| Voltage Tolerance | ±5 % - supports cost-sensitive designs where tighter tolerance is unnecessary, e.g., non-critical bias rails |
| Differential Resistance | 600 Ω max at IZ = 5 mA - indicates moderate regulation stiffness; suitable for static references but not high-dynamic-load applications |
| Forward Voltage | 0.9 V max at IF = 10 mA - enables use as low-drop rectifier or clamp in signal conditioning paths |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C with 35 mm² cathode copper - sets absolute maximum continuous power under defined PCB layout conditions |
| Junction Temperature Limit | 150 °C - constrains maximum allowable ambient + self-heating in sealed enclosures or high-temperature environments |
| Diode Capacitance | 220 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise coupling and bandwidth in RF-adjacent analog stages |
Pinout & Package
SOD523 (SC-79) ultra-small surface-mount plastic package: 1.2 mm × 0.8 mm × 0.6 mm body, flat lead, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; must be routed to largest available copper area for thermal management |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased operation requires anode at lower voltage than cathode |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable regulation in nanoampere-scale bias networks without loading sensitive sources |
| Optimized leakage profile | C-series intentional minor leakage rise - reduces switching transients and improves noise floor in precision analog references |
| Ultra-compact footprint | SOD523 package (1.2 × 0.8 mm) - saves board space in wearables, hearing aids, and multi-sensor modules where size is constrained |
| Thermal performance | 350 K/W Rth(j-a) with 35 mm² cathode copper - allows predictable derating in thermally isolated PCB regions |
| Stable low-voltage reference | 1.8 V nominal with −3.5 mV/K tempco - matches common logic supply rails and enables direct interfacing with 1.8 V I/O domains |
Applications
| Portable Sensor Biasing | Microcontroller Reset Reference |
|---|---|
Use Scenario: Providing stable 1.8 V bias to MEMS accelerometer analog front-end in Bluetooth LE beacon. IC Role / Device Role / Timing Role: Shunt voltage reference regulating bias voltage for internal op-amp and ADC reference input. Use Value: Enables consistent sensor offset calibration across −40 °C to +85 °C with <±10 mV drift, leveraging −3.5 mV/K tempco and low 50 µA operating current. |
Use Scenario: Generating reliable reset threshold for ARM Cortex-M0+ MCU powered from single-cell Li-ion battery. IC Role / Device Role / Timing Role: Zener-based reset supervisor reference feeding comparator input to detect brown-out at 1.75 V. Use Value: Delivers deterministic 1.8 V reference with 600 Ω dynamic impedance, ensuring clean reset assertion within 10 µs of voltage drop below threshold. |
| Low-Power Analog Front-End | Wearable Battery Monitoring |
Use Scenario: Setting reference voltage for instrumentation amplifier in ECG patch with coin-cell power. IC Role / Device Role / Timing Role: Precision DC reference source for gain-setting network and ADC reference divider. Use Value: Maintains 1.8 V accuracy over 10 nA–100 µA load range, minimizing error contribution to sub-µV-level biopotential measurements. |
Use Scenario: Monitoring 1.8 V LDO output in smartwatch PMIC to detect early battery depletion. IC Role / Device Role / Timing Role: Low-current voltage monitor clamping reference for ADC input scaling. Use Value: Provides repeatable 1.8 V reference with 220 pF capacitance, avoiding signal integrity issues during fast ADC sampling cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-current Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-B1V8 | ±2 % tolerance vs. ±5 %; identical 1.8 V nominal and SOD523 package | Used where tighter voltage accuracy required, e.g., precision ADC references or calibration circuits | Select B1V8 only if system-level tolerance budget demands <±36 mV deviation at 25 °C |
| MMSZ4678T1G | 1.8 V nominal, ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, higher rdiff (1000 Ω) | Preferred for higher-power or legacy board designs with larger pad spacing; less suitable for ultra-dense layouts | Choose only if SOD-123 footprint is already allocated and thermal margin exceeds 300 mW requirement |
Compared with BZX58550-C1V8X, the B1V8 offers tighter tolerance at same package size but no leakage optimization, while MMSZ4678T1G trades miniaturization for higher power handling and relaxed layout constraints - making C1V8X optimal for new ultra-low-power, space-constrained designs.
Availability
BZX58550-C1V8X is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset reference, and low-power analog front-end applications requiring stable component supply with guaranteed long-term sourcing.
Supply support for BZX58550-C1V8X 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-grade and industrial-standard components.
The BZX58550 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for energy-efficient voltage referencing in battery-powered and space-constrained electronics.
FAQ
What is the maximum continuous reverse current the BZX58550-C1V8X can handle without exceeding its 300 mW power limit?
At 1.8 V nominal Zener voltage, the maximum continuous reverse current is 166 mA (300 mW ÷ 1.8 V). However, the Absolute Maximum Rating specifies 200 mA forward current - not reverse - and actual safe operating current is limited by thermal design: with 35 mm² cathode copper, sustained current above ~80 mA risks exceeding 150 °C junction temperature at 25 °C ambient.
Can the BZX58550-C1V8X be used in place of a standard 1N4729A (1.8 V Zener) in existing designs?
No - the 1N4729A uses DO-41 through-hole packaging and is rated for 1 W dissipation, whereas BZX58550-C1V8X is SOD523 surface-mount with 300 mW rating and 50 µA test current. Substitution requires PCB redesign, thermal validation, and verification of dynamic impedance impact on circuit stability.
How does the "intentional minor rise of leakage current" in the C-series affect long-term reliability?
The controlled leakage increase (per AN90031) is implemented via process tuning and does not accelerate degradation; accelerated life testing confirms >1000 hours at 150 °C junction temperature with no parametric shift beyond specification limits - confirming suitability for 10+ year consumer device lifetimes.
Is the 220 pF diode capacitance measured at zero bias relevant for AC-coupled signal paths?
Yes - at 0 V reverse bias, 220 pF represents worst-case capacitance for high-impedance nodes. In AC-coupled applications like audio biasing or RF detector inputs, this value directly determines low-frequency cutoff (e.g., 72 kHz with 10 kΩ source impedance) and must be included in SPICE models for accurate transient simulation.
BZX58550-C1V8X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 1.8 V
- Tolerance:
- ±5%
- Power - Max:
- 300 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-C1V8X FAQ
1.How can I place an order for BZX58550-C1V8X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C1V8X 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-C1V8X reliable?
The price and inventory of BZX58550-C1V8X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-C1V8X is usually 5 days.
3.What payment methods are accepted for BZX58550-C1V8X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C1V8X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C1V8X?
BZX58550-C1V8X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C1V8X 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-C1V8X?
For technical support, including BZX58550-C1V8X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C1V8X requirements.
6.How does Aetrix verify that BZX58550-C1V8X is sourced from the original manufacturer or authorized distributors?
All BZX58550-C1V8X 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-C1V8X meets industry standards.
7.What is the process for return or replacement of BZX58550-C1V8X?
All BZX58550-C1V8X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C1V8X, 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-C1V8X part is unused and in its original packaging.
Return procedure for BZX58550-C1V8X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C1V8X Tags
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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
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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