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Nexperia USA Inc. BZX585-C3V9,135
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- Part No.:
- BZX585-C3V9,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-C3V9,135.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
BZX585-C3V9,135 from Nexperia is a ±5 % tolerance Zener diode in SOD523 (SC-79) package, rated for 3.9 V nominal regulation at 5 mA, with 400 Ω typical differential resistance and 300 mW total power dissipation. It delivers stable voltage reference in low-power analog circuits, ESD-protected I/O clamping, and precision biasing for sensor front-ends.
For engineers reviewing the BZX585-C3V9,135 datasheet, BZX585-C3V9,135 pinout, BZX585-C3V9,135 application, or BZX585-C3V9,135 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (65 K/W junction-to-solder-point), non-repetitive surge capability (40 W/100 µs), and ultra-small footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 3.9 V reference across load variations and temperature shifts from −65 °C to +150 °C. Its low 3.0 µA maximum reverse current at VR = 1 V ensures minimal leakage in standby-sensitive designs.
The device features a cathode-marked SOD523 package with 350 K/W junction-to-ambient thermal resistance on FR4 PCB (35 mm² copper), enabling reliable operation without heatsinking in ambient temperatures up to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.71 V to 4.10 V at IZ = 5 mA - defines tight regulation window for 3.9 V nominal reference |
| Differential Resistance (rdiff) | 400 Ω typical at IZ = 5 mA - determines output impedance and load regulation error |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard FR4 layout |
| Non-repetitive Peak Power (PZSM) | 40 W for 100 µs square wave - supports transient overvoltage suppression in surge-prone interfaces |
| Reverse Current (IR) | 3.0 µA max at VR = 1 V - ensures low quiescent current in battery-powered voltage monitor circuits |
| Junction-to-Solder-Point Rth | 65 K/W - enables accurate thermal modeling when mounted on thermally enhanced pads |
| Forward Voltage (VF) | 1.1 V max at IF = 100 mA - specifies forward conduction loss during polarity-reversal protection use |
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; marking bar identifies this terminal for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage reference where tighter tolerance is not required, reducing BOM cost vs. ±2 % variants |
| Ultra-compact SOD523 footprint | Supports >2× higher component density than SOD323 in space-constrained wearables and IoT sensors |
| 40 W non-repetitive surge rating | Provides single-event ESD immunity per IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact) without external TVS |
| Low 3.0 µA reverse leakage | Minimizes standby current drain in always-on battery-backed voltage supervisors and real-time clock circuits |
| −1.9 mV/K temperature coefficient | Delivers predictable, slightly negative drift over temperature-ideal for compensation-aware bias networks |
Applications
| Power Supply Rail Clamp | Low-Power Sensor Bias |
|---|---|
Use Scenario: Clamping 3.3 V I/O lines against ESD transients in industrial PLC input modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown as shunt overvoltage protector. Use Value: Absorbs 40 W surges within 100 µs while holding line voltage ≤ 4.1 V, preventing damage to downstream MCU GPIO. |
Use Scenario: Providing stable 3.9 V bias to MEMS pressure sensor bridge excitation in portable medical devices. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric analog signal conditioning. Use Value: Maintains <±2 % output variation across −40 °C to +85 °C due to low rdiff and predictable SZ coefficient. |
| Microcontroller Reset Monitor | ADC Reference Stabilizer |
Use Scenario: Generating threshold voltage for RC-based reset circuit in battery-powered edge nodes. IC Role / Device Role / Timing Role: Zener-based comparator reference with hysteresis via resistor divider. Use Value: Enables deterministic reset assertion at 3.71–4.10 V with <1 µA supply current draw during deep sleep. |
Use Scenario: Stabilizing reference input of 12-bit SAR ADC in automotive cabin temperature sensor. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference for analog-to-digital conversion. Use Value: Limits reference error to <0.5 LSB over full temperature range using 400 Ω rdiff and 3.0 µA IR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-B3V9,135 | ±2 % tolerance (3.82–3.98 V), higher cost, same SOD523 package and thermal specs | Required where tighter regulation is needed for precision ADC references or bandgap calibration | Select when VZ accuracy dominates over cost and board area constraints |
| MMSZ4V3T1G | 4.3 V nominal, ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, 30 Ω rdiff | Better regulation for higher-current loads but occupies >3× PCB area and lacks 40 W surge rating | Choose only if higher power dissipation or lower dynamic impedance is mandatory and space permits |
Compared with BZX585-C3V9,135, the BZX585-B3V9,135 improves voltage accuracy at the expense of unit cost, while MMSZ4V3T1G trades ultra-small size and surge robustness for higher power handling and lower impedance-making BZX585-C3V9,135 optimal for miniaturized, transient-hardened 3.9 V reference designs.
Availability
BZX585-C3V9,135 is available at Aetrix Electronics and suitable for industrial sensor nodes, wearable health monitors, and automotive body-control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for BZX585-C3V9,135 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 focused on high-volume, high-reliability discrete and logic devices, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality systems.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, cost-efficient voltage regulation and transient protection in space- and power-constrained applications.
FAQ
What is the maximum continuous reverse current this Zener can handle at 3.9 V?
The BZX585-C3V9,135 is rated for 200 mA maximum forward current, but its Zener operation is specified at test currents up to 5 mA for regulation parameters. Continuous reverse current must be limited by external series resistance to ensure power dissipation stays within 300 mW at ambient temperature-typically limiting IZ to ≤76 mA at 3.9 V on standard FR4.
Can this diode replace a 3.3 V Zener in an existing design?
No-BZX585-C3V9,135 has a nominal Zener voltage of 3.9 V (3.71–4.10 V range), not 3.3 V. Substituting it for a 3.3 V part would raise regulated voltage by ~18 %, potentially damaging downstream 3.3 V logic. For 3.3 V regulation, consider BZX585-C3V3,135 (3.14–3.47 V).
How does the SOD523 package affect thermal performance compared to SOD323?
The SOD523 package has higher thermal resistance: Rth(j-a) = 350 K/W versus ~250 K/W for SOD323 under identical PCB conditions. This reduces maximum allowable power dissipation by ~30 % at elevated ambient temperatures, requiring careful thermal layout with cathode-side copper pour to maintain reliability.
Is this part suitable for automotive applications?
No-BZX585-C3V9,135 is not AEC-Q200 qualified. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products like this Zener are unsuitable for safety-critical or automotive use. For automotive-grade Zeners, select Nexperia's Automotive Qualified (AQ) series with documented PPAP and qualification reports.
BZX585-C3V9,135 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):
- 3.9 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-C3V9,135 FAQ
1.How can I place an order for BZX585-C3V9,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-C3V9,135 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-C3V9,135 reliable?
The price and inventory of BZX585-C3V9,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-C3V9,135 is usually 5 days.
3.What payment methods are accepted for BZX585-C3V9,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-C3V9,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-C3V9,135?
BZX585-C3V9,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-C3V9,135 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-C3V9,135?
For technical support, including BZX585-C3V9,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-C3V9,135 requirements.
6.How does Aetrix verify that BZX585-C3V9,135 is sourced from the original manufacturer or authorized distributors?
All BZX585-C3V9,135 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-C3V9,135 meets industry standards.
7.What is the process for return or replacement of BZX585-C3V9,135?
All BZX585-C3V9,135 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-C3V9,135, 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-C3V9,135 part is unused and in its original packaging.
Return procedure for BZX585-C3V9,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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