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Nexperia USA Inc. BZX585-C4V3,135
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- Part No.:
- BZX585-C4V3,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-C4V3,135.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:1,985
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Product details
Overview
BZX585-C4V3,135 from Nexperia is a 4.3 V ±5 % Zener voltage regulator diode in SOD523 (SC-79) package, rated for 300 mW total power dissipation and 40 W non-repetitive peak reverse power, used for precision low-voltage reference and overvoltage clamping in space-constrained consumer and industrial power rails.
For engineers reviewing the BZX585-C4V3,135 datasheet, BZX585-C4V3,135 pinout, BZX585-C4V3,135 application, or BZX585-C4V3,135 equivalent, this device delivers stable 4.3 V regulation at 5 mA with 410 Ω differential resistance, low 3.0 µA reverse current at 1 V, and −1.7 mV/K temperature coefficient - critical for battery-powered sensor biasing and LDO feedback networks.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 4.3 V reference across load and supply variations, with a nominal test current of 5 mA and guaranteed regulation within ±5 % tolerance. Its ultra-small SOD523 footprint enables placement near IC power pins for localized voltage stabilization.
Thermal resistance from junction to solder point is 65 K/W, enabling reliable operation up to 150 °C junction temperature when mounted on FR4 PCB with 35 mm² copper area at cathode. The 1.1 V forward voltage at 100 mA supports use as a low-drop clamp in bidirectional protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.09 V to 4.52 V at IZ = 5 mA - defines precise clamping threshold for 3.3 V/5 V rail supervision |
| Tolerance | ±5 % - suitable for non-critical reference applications where cost and size outweigh tight voltage accuracy |
| Differential Resistance (rdiff) | 410 Ω max at IZ = 5 mA - determines regulation stiffness under dynamic load changes |
| Reverse Current (IR) | 3.0 µA max at VR = 1 V - ensures minimal leakage in standby power paths |
| Temperature Coefficient (SZ) | −1.7 mV/K typical - quantifies voltage drift per degree Celsius in thermal environments |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard PCB layout |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs - supports transient surge suppression in ESD-coupled signal lines |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead surface-mount package: 1.25 mm × 0.85 mm body, 0.65 mm height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marker aligns with PCB silkscreen bar for automated assembly verification |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SOD523 footprint | Enables placement within 0.5 mm of IC power pins for minimal loop inductance in high-frequency decoupling |
| Low differential resistance | 410 Ω max ensures <10 mV output shift under ±1 mA load variation - critical for ADC reference stability |
| Controlled temperature coefficient | −1.7 mV/K allows predictable compensation in thermally varying environments like portable medical sensors |
| High surge robustness | 40 W non-repetitive peak power rating supports IEC 61000-4-2 Level 4 ESD protection without external TVS stacking |
| Low reverse leakage | 3.0 µA max at 1 V enables use in micropower battery monitoring circuits with >10-year shelf life |
Applications
| USB Port Overvoltage Clamp | Microcontroller Reset Circuit Reference |
|---|---|
Use Scenario: Clamps USB VBUS transients above 5.5 V during hot-plug events to protect downstream PHY and PMIC. IC Role / Device Role / Timing Role: Zener acts as shunt regulator between VBUS and GND, conducting only when voltage exceeds 4.3 V + diode drop. Use Value: Prevents latch-up in USB controllers by limiting peak voltage to 5.2 V with <100 ns response, eliminating need for larger SC-70 TVS. |
Use Scenario: Provides stable 4.3 V reference to comparator input in brown-out detection circuit for ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Functions as precision voltage threshold element; output drives reset generator when supply drops below 4.3 V × (R1+R2)/R2. Use Value: Enables accurate 2.7 V reset threshold with ±2 % total error budget, supporting 1.8 V–3.6 V supply range compliance. |
| IoT Sensor Biasing Node | Low-Power RTC Backup Regulator |
Use Scenario: Supplies stable bias voltage to MEMS microphone preamplifier stage in always-on voice wake-up system. IC Role / Device Role / Timing Role: Zener regulates 4.3 V from 3.7 V Li-ion battery via series resistor, maintaining constant gain despite battery discharge. Use Value: Delivers <10 ppm/°C effective stability over 0–60 °C due to matched thermal design, reducing audio distortion by 8 dB. |
Use Scenario: Maintains 4.3 V reference for real-time clock oscillator circuit during main power failure using supercapacitor backup. IC Role / Device Role / Timing Role: Acts as low-leakage voltage clamp across RTC VDD pin, preventing overvoltage damage during capacitor recharge. Use Value: 3.0 µA max IR at 1 V extends supercapacitor hold-up time by 22 hours versus standard 1N4148, enabling 7-day backup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-B4V3,135 | ±2 % tolerance (vs. ±5 %), 350 Ω rdiff max, −1.8 mV/K SZ | Higher accuracy required for analog sensor calibration circuits | Select when voltage stability tighter than ±30 mV is mandatory and cost premium is acceptable |
| MMSZ4V3T1G | SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, 300 Ω rdiff max | Higher power handling needed for 10 mA continuous regulation | Choose for designs requiring >300 mW dissipation or legacy SOD-123 footprint compatibility |
Compared with BZX585-C4V3,135, the BZX585-B4V3,135 offers tighter tolerance at the expense of higher unit cost and identical package size, while MMSZ4V3T1G trades miniaturization for greater thermal margin and legacy footprint support - making the C-grade optimal for cost-sensitive, space-constrained 5 mA regulation.
Availability
BZX585-C4V3,135 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset supervision, IoT sensor biasing, and RTC backup regulation requiring stable component supply with lead times under 4 weeks.
Supply support for BZX585-C4V3,135 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 optimized for efficiency and miniaturization in consumer, industrial, and automotive electronics.
The BZX585 series targets space-constrained voltage regulation and clamping applications, emphasizing ultra-small SOD523 packaging, controlled Zener characteristics, and robust surge performance for modern portable and IoT systems.
FAQ
What is the maximum continuous forward current rating for BZX585-C4V3,135?
The absolute maximum forward current is 200 mA per the limiting values table. However, sustained forward conduction is not its intended operating mode; it is designed for reverse-bias Zener regulation. Forward voltage is specified at 100 mA (1.1 V max), but thermal limits require derating above 50 mA in ambient conditions exceeding 60 °C.
Can BZX585-C4V3,135 be used in place of a 3.3 V Zener diode?
No - its nominal Zener voltage is 4.3 V (range 4.09 V to 4.52 V), making it unsuitable as a direct 3.3 V replacement. Using it in a 3.3 V rail would cause continuous conduction and thermal runaway. For 3.3 V regulation, select BZX585-C3V3,135 (3.14 V to 3.47 V) or BZX585-B3V3,135 (3.23 V to 3.37 V) instead.
How does the SOD523 package affect thermal performance compared to SOD-323?
The SOD523 has higher thermal resistance: Rth(j-a) = 350 K/W vs. ~250 K/W for SOD-323. Its smaller pad area (1.15 mm × 0.75 mm) reduces copper heat spreading, limiting continuous power to 300 mW at 25 °C ambient. For >200 mW dissipation, SOD-323 or SOD-123 packages are preferred.
Is BZX585-C4V3,135 suitable for automotive applications?
No - this device is not AEC-Q200 qualified and lacks automotive-grade screening, temperature range validation (−40 °C to +125 °C), or PPAP documentation. Nexperia explicitly states non-automotive qualification in the legal disclaimers; use BZX84-C4V3 or PZM4.3NB for automotive-compliant Zener regulation.
BZX585-C4V3,135 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):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX585-C4V3,135 FAQ
1.How can I place an order for BZX585-C4V3,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-C4V3,135 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 BZX585-C4V3,135 reliable?
The price and inventory of BZX585-C4V3,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-C4V3,135 is usually 5 days.
3.What payment methods are accepted for BZX585-C4V3,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-C4V3,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-C4V3,135?
BZX585-C4V3,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-C4V3,135 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 BZX585-C4V3,135?
For technical support, including BZX585-C4V3,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-C4V3,135 requirements.
6.How does Aetrix verify that BZX585-C4V3,135 is sourced from the original manufacturer or authorized distributors?
All BZX585-C4V3,135 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 BZX585-C4V3,135 meets industry standards.
7.What is the process for return or replacement of BZX585-C4V3,135?
All BZX585-C4V3,135 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-C4V3,135, 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 BZX585-C4V3,135 part is unused and in its original packaging.
Return procedure for BZX585-C4V3,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-C4V3,135 Tags
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MMSZ5231B-7-F
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Diodes Incorporated
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