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Nexperia USA Inc. BZX585-C18,115
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- Part No.:
- BZX585-C18,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-C18,115.pdf
- Description:
- DIODE ZENER 18V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:1,965
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Product details
Overview
BZX585-C18,115 from Nexperia is a 18 V ±5 % Zener voltage regulator diode in SOD523 (SC-79) ultra-small surface-mount package, rated for 300 mW total power dissipation and 40 W non-repetitive peak reverse power, used for precision voltage reference and overvoltage clamping in space-constrained DC power rails.
For engineers reviewing the BZX585-C18,115 datasheet, BZX585-C18,115 pinout, BZX585-C18,115 application, or BZX585-C18,115 equivalent, this device serves as a low-capacitance (≤12.6 pF), low-differential-resistance (≤225 Ω at IZ = 5 mA) Zener solution for portable electronics, sensor biasing, and microcontroller I/O protection where thermal resistance to solder point is critical at 65 K/W.
Technical Context
This Zener diode operates in reverse breakdown with a nominal Zener voltage of 18 V at 5 mA test current, exhibiting a temperature coefficient of +12.4 to +16.0 mV/K and differential resistance ≤225 Ω under specified conditions. Its SC-79 package enables high-density PCB layouts while maintaining thermal performance via direct cathode tab conduction.
The device supports transient suppression with 40 W non-repetitive peak reverse power at 100 µs pulse width and 25 °C junction temperature, and delivers stable regulation across −65 °C to +150 °C ambient range with ≤0.05 µA reverse leakage at 13.7 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V to 18.9 V at IZ = 5 mA - defines regulated output voltage tolerance band for reference stability |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C on FR4 PCB with 35 mm² copper - sets continuous DC power handling limit |
| Non-repetitive Peak Reverse Power (PZSM) | 40 W at tp = 100 µs, square wave - enables short-duration surge clamping without failure |
| Differential Resistance (rdiff) | ≤225 Ω at IZ = 5 mA - determines regulation stiffness and output impedance under load variation |
| Reverse Capacitance (Cd) | ≤12.6 pF at f = 1 MHz, VR = 0 V - ensures minimal signal distortion in high-frequency bias or RF-coupled applications |
| Thermal Resistance (Rth(j-sp)) | 65 K/W from junction to solder point - enables accurate thermal modeling when cathode tab is thermally anchored |
| Forward Voltage (VF) | 1.1 V at IF = 100 mA - defines forward conduction loss during polarity-reversal fault events |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead surface-mount plastic package with 2 terminals; cathode identified by marking bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; carries reverse breakdown current and must be routed to low-impedance ground or reference plane |
| 2 | Anode (A) | Connected to unregulated input or higher-potential rail; forms reverse-biased junction with cathode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SOD523 footprint | 1.25 mm × 0.85 mm × 0.65 mm - enables placement in <1.5 mm² board area for wearables and miniaturized IoT nodes |
| ±5 % Zener voltage tolerance | 17.1 V–18.9 V at 5 mA - provides predictable clamping threshold for cost-sensitive industrial control interfaces |
| Low differential resistance | ≤225 Ω at IZ = 5 mA - minimizes output voltage shift under varying load currents in analog sensor circuits |
| High surge capability | 40 W non-repetitive peak power at 100 µs - protects downstream logic from ESD transients per IEC 61000-4-2 Level 4 |
| Low junction-to-solder-point thermal resistance | 65 K/W - allows direct thermal coupling to PCB copper for sustained 300 mW operation without heatsinking |
Applications
| Portable Power Management | Sensor Bias Reference |
|---|---|
|
Use Scenario: Regulating 18 V supply for Li-ion battery charger IC feedback loop in compact USB-C PD adapters. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 18 V setpoint for error amplifier input. Use Value: Tight 17.1–18.9 V tolerance ensures ±1.5 % output voltage accuracy without trimming resistors. |
Use Scenario: Providing precise 18 V bias to MEMS pressure sensor bridge in medical handheld diagnostics. IC Role / Device Role / Timing Role: Stable excitation voltage source for ratiometric sensor output scaling. Use Value: Low 12.6 pF capacitance prevents high-frequency noise coupling into sensitive analog front-end. |
| Microcontroller I/O Protection | Industrial Signal Conditioning |
|
Use Scenario: Clamping 18 V GPIO lines against ESD and inductive kickback in automotive body control modules. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between MCU pin and 18 V rail. Use Value: 40 W peak power rating absorbs 8 kV contact discharge per IEC 61000-4-2 without degradation. |
Use Scenario: Stabilizing 18 V reference for 16-bit DAC in programmable logic controller analog output stage. IC Role / Device Role / Timing Role: Precision shunt regulator establishing clean reference for current-loop driver. Use Value: 65 K/W junction-to-solder-point thermal resistance enables stable regulation under 70 °C ambient cabinet conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-B18,115 | ±2 % tolerance (17.64–18.36 V), lower rdiff (≤200 Ω), same package and PZSM | Higher precision required in metrology-grade references or closed-loop feedback paths | Select when tighter voltage tolerance justifies minor cost premium and lower production yield sensitivity |
| MMSZ5246B-7-F | 18 V ±5 %, SOD-123 package (2.7 × 1.4 mm), Ptot = 500 mW, rdiff = 23 Ω typical | Higher power handling needed in 24 V industrial systems with >300 mW average dissipation | Choose when board layout permits larger footprint and thermal management requires >300 mW continuous rating |
Compared with BZX585-C18,115, the BZX585-B18,115 offers improved voltage accuracy at identical size and surge capability, while MMSZ5246B-7-F trades miniaturization for higher power and lower dynamic impedance-making it suitable only where SOD-123 real estate and thermal mass are available.
Availability
BZX585-C18,115 is available at Aetrix Electronics and suitable for portable power management, sensor biasing, microcontroller I/O protection, and industrial signal conditioning requiring stable component supply and consistent parametric performance across production batches.
Supply support for BZX585-C18,115 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, delivering energy-efficient solutions for automotive, industrial, and consumer markets.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered for space-constrained voltage regulation and transient suppression in battery-powered and signal-integrity-critical applications.
FAQ
What is the maximum continuous reverse current for BZX585-C18,115 at 25 °C ambient?
The maximum continuous reverse current is derived from its 300 mW total power dissipation and 18 V nominal Zener voltage, yielding approximately 16.7 mA (300 mW ÷ 18 V). This assumes no additional thermal derating and full copper pad thermal relief per datasheet condition.
Can BZX585-C18,115 be used in place of a 1N4746A in an existing design?
No-BZX585-C18,115 uses an SOD523 package (1.25 × 0.85 mm) versus the 1N4746A's DO-41 through-hole package (4.5 × 2.5 mm), and has different thermal characteristics (65 K/W vs ~100 K/W) and surge capability (40 W vs 50 W). Board redesign and thermal validation are required.
How does the temperature coefficient affect regulation accuracy over −40 °C to +85 °C?
With a specified SZ of +12.4 to +16.0 mV/K, the Zener voltage increases by up to 2.0 V across a 125 K temperature span. For a 18 V nominal device, this results in up to ±5.6 % drift-requiring compensation in precision references but acceptable for clamping or coarse biasing.
Is the cathode marking visible under standard optical inspection?
Yes-the cathode is indicated by a distinct marking bar on the top surface of the SOD523 package, aligned with Pin 1 per Figure 11 in the datasheet. The bar is laser-marked and clearly resolvable at 20× magnification using standard AOI or manual inspection.
BZX585-C18,115 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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX585-C18,115 FAQ
1.How can I place an order for BZX585-C18,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-C18,115 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-C18,115 reliable?
The price and inventory of BZX585-C18,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-C18,115 is usually 5 days.
3.What payment methods are accepted for BZX585-C18,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-C18,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-C18,115?
BZX585-C18,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-C18,115 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-C18,115?
For technical support, including BZX585-C18,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-C18,115 requirements.
6.How does Aetrix verify that BZX585-C18,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-C18,115 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-C18,115 meets industry standards.
7.What is the process for return or replacement of BZX585-C18,115?
All BZX585-C18,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-C18,115, 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-C18,115 part is unused and in its original packaging.
Return procedure for BZX585-C18,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-C18,115 Tags
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