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Nexperia USA Inc. BZX58550-C1V8-QX
- Part No.:
- BZX58550-C1V8-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C1V8-QX.pdf
- Description:
- DIODE ZENER 1.8V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:19,896
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Product details
Overview
BZX58550-C1V8-Q 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, battery-powered systems. It delivers a nominal 1.8 V regulation at 50 µA test current, with ±5 % tolerance, 600 Ω differential resistance at 5 mA, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX58550-C1V8-Q datasheet, BZX58550-C1V8-Q pinout, BZX58550-C1V8-Q application, or BZX58550-C1V8-Q equivalent, key selection criteria include low-test-current operation, ultra-small footprint, thermal performance on FR4 PCBs, and leakage-optimized switching behavior per AN90031.
Technical Context
This device operates as a two-terminal shunt voltage reference, conducting in reverse breakdown to clamp voltage across its terminals. Its specified regulation at 50 µA enables stable biasing in micro-power circuits where traditional Zeners draw excessive quiescent current.
The intentional minor rise in leakage current (per BZX58550-B/Cxx-Q series design) improves transient response and reduces noise in signal-path references. Thermal resistance from junction to ambient is 460 K/W on standard FR4, rising to 350 K/W with 35 mm² cathode copper area.
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 sensor bias or LDO feedback |
| Tolerance | ±5 % - supports cost-sensitive designs where tighter tolerance is unnecessary |
| Differential Resistance | 600 Ω max at IZ = 5 mA - indicates moderate regulation stiffness under small-signal load variation |
| Forward Voltage | 0.9 V max at IF = 10 mA - ensures predictable conduction during power-up or fault conditions |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C with 35 mm² cathode Cu - sets safe continuous operating limit on typical PCB layout |
| Junction Temperature | 150 °C max - enables operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - confirms reliability for automotive electronics including body control modules and infotainment power rails |
Pinout & Package
SOD523 (SC-79) plastic surface-mounted package: 2-pin, 1.2 mm × 0.8 mm × 0.6 mm body, ultra-flat profile optimized for high-density PCB assembly. Cathode identified by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; carries reverse breakdown current and requires thermal copper area for power dissipation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - minimizes quiescent current draw in always-on battery circuits |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - enhances switching speed and reduces noise in reference paths |
| Ultra-compact SMD package | SOD523 footprint - saves >60 % board area vs. SOD323, enabling wearable and IoT sensor designs |
| Automotive-grade reliability | AEC-Q101 qualified - validated for temperature cycling, humidity, and mechanical stress in automotive ECUs |
| Thermal performance scalability | Rth(j-a) = 460 → 350 K/W with added copper - allows designers to trade layout area for power handling |
Applications
| Automotive Body Control Module | Wearable Health Sensor Bias |
|---|---|
Use Scenario: Providing stable 1.8 V reference for LIN transceiver analog front-end in door module. IC Role / Device Role / Timing Role: Shunt voltage reference for ADC reference buffer and op-amp bias network. Use Value: Enables accurate sensor measurement under cold-crank (6 V) and load-dump (40 V) conditions without active regulation overhead. | Use Scenario: Supplying precision bias to photodiode amplifier in optical heart-rate monitor. IC Role / Device Role / Timing Role: Low-current Zener reference establishing DC operating point for transimpedance amplifier. Use Value: Delivers stable 1.8 V at 50 µA, extending coin-cell battery life beyond 12 months while maintaining SNR > 85 dB. |
| Industrial IoT Edge Node | USB-C Power Negotiation Reference |
Use Scenario: Generating local 1.8 V rail for ultra-low-power MCU core supply in wireless sensor node. IC Role / Device Role / Timing Role: Passive voltage clamp regulating charge-pump output before LDO input. Use Value: Eliminates need for dedicated low-IQ LDO, reducing BoM count and standby current by 1.2 µA. | Use Scenario: Setting precise 1.8 V threshold for USB PD CC line voltage detection logic. IC Role / Device Role / Timing Role: Analog comparator reference defining USB-C attachment state detection window. Use Value: Ensures reliable plug detection across −40 °C to +105 °C with < ±15 mV drift over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-B1V8-Q | ±2 % tolerance, lower leakage, no intentional IR rise | Better for metrology-grade references requiring minimal tempco drift | Select when absolute voltage accuracy outweighs switching noise reduction |
| MMSZ4678T1G | 1.8 V, ±5 %, SOD-123, 500 mW Ptot, higher rdiff (1000 Ω) | Higher power margin but larger footprint and inferior low-current regulation | Choose only if SOD-123 is already standardized in design and thermal headroom exceeds 150 mW |
Compared with BZX58550-B1V8-Q, this C-series variant trades tighter tolerance for improved dynamic behavior; versus MMSZ4678T1G, it offers 40 % smaller footprint and 30 % lower differential resistance at 5 mA-critical for miniaturized, low-noise applications.
Availability
BZX58550-C1V8-Q is available at Aetrix Electronics and suitable for automotive body electronics, wearable biosensors, industrial edge nodes, and USB-C interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-C1V8-Q 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-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-power voltage reference and regulation in space- and energy-constrained automotive and portable electronics.
FAQ
What is the maximum reverse voltage this diode can withstand continuously?
The BZX58550-C1V8-Q has a nominal Zener voltage of 1.8 V and is not rated for continuous reverse voltage above its breakdown threshold. Its absolute maximum reverse voltage is defined by the non-repetitive peak power limit: 40 W for 100 µs pulses. Continuous operation must remain within the 300 mW total power dissipation limit at ambient ≤25 °C with adequate PCB copper area.
Does the "C" in the part number indicate a specific temperature coefficient?
No-the "C" denotes the ±5 % tolerance grade, not temperature coefficient. All BZX58550-Cxx-Q variants share a typical temperature coefficient of −3.5 mV/K for 1.8 V to 6.8 V types. This negative TC is inherent to low-voltage Zener mechanisms and is confirmed in Table 8 for the C1V8 variant.
Can this diode be used in place of a 1.8 V LDO for powering an MCU core?
No-it functions as a shunt regulator, not a series regulator. It clamps voltage by sinking excess current to ground, requiring a series resistor and generating heat proportional to load variation. For MCU core supply, an LDO provides regulated output with load-dependent current sourcing; this Zener is appropriate only for reference/bias generation, not primary power delivery.
How does the marking code "1C" correspond to BZX58550-C1V8-Q?
Per Table 4, "1C" is the official top-side marking for BZX58550-C1V8-Q. The first character "1" identifies the 1.8 V nominal voltage, and the second character "C" specifies the ±5 % tolerance grade. This matches Nexperia's standardized SOD523 marking scheme and is verified in the product data sheet revision history.
BZX58550-C1V8-QX 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-C1V8-QX FAQ
1.How can I place an order for BZX58550-C1V8-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C1V8-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-C1V8-QX reliable?
The price and inventory of BZX58550-C1V8-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-C1V8-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-C1V8-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C1V8-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C1V8-QX?
BZX58550-C1V8-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C1V8-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-C1V8-QX?
For technical support, including BZX58550-C1V8-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C1V8-QX requirements.
6.How does Aetrix verify that BZX58550-C1V8-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-C1V8-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-C1V8-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-C1V8-QX?
All BZX58550-C1V8-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C1V8-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-C1V8-QX part is unused and in its original packaging.
Return procedure for BZX58550-C1V8-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C1V8-QX 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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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
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BZT52C3V6LP-7
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