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Nexperia USA Inc. BZX585-B18,115
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- Part No.:
- BZX585-B18,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B18,115.pdf
- Description:
- DIODE ZENER 18V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,194
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Product details
Overview
BZX585-B18,115 from Nexperia is a ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 18 V nominal regulation voltage, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power at 100 µs pulse width. It delivers low differential resistance (≤225 Ω at IZ = 5 mA) and operates across −65 °C to +150 °C junction temperature range, serving as a precision voltage reference in compact power management circuits.
For engineers reviewing the BZX585-B18,115 datasheet, BZX585-B18,115 pinout, BZX585-B18,115 application, or BZX585-B18,115 equivalent, this device supports stable low-current regulation in space-constrained designs where thermal resistance to solder point (65 K/W) and cathode-marked polarity are critical layout considerations.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 17.1 V to 18.9 V at IZ = 5 mA, exhibiting a temperature coefficient of +12.4 mV/K to +16.0 mV/K over its operating current range. Its low 225 Ω typical differential resistance ensures minimal voltage variation under load shifts.
The device uses an ultra-small SOD523 surface-mount package with defined thermal resistance from junction to solder point (65 K/W), enabling reliable operation on FR4 PCBs with ~35 mm² copper area at the cathode tab. Reverse current remains ≤0.05 µA at VR = 14.4 V, supporting high-impedance biasing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 18 V (17.1 V min / 18.9 V max at IZ = 5 mA); defines stable regulation point in feedback or reference paths |
| Tolerance | ±2 %; enables tighter voltage margin control than ±5 % variants in precision analog circuits |
| Total Power Dissipation | 300 mW at Tamb = 25 °C on FR4 PCB with 35 mm² Cu; sets maximum continuous DC power handling |
| Non-repetitive Peak Power | 40 W at tp = 100 µs square wave; supports transient surge suppression without failure |
| Differential Resistance | ≤225 Ω (typ. 50 Ω) at IZ = 5 mA; determines output impedance and load regulation sensitivity |
| Reverse Current | ≤0.05 µA at VR = 14.4 V; ensures minimal leakage in high-impedance voltage divider or bias networks |
| Thermal Resistance j–sp | 65 K/W; quantifies junction-to-solder-point heat transfer efficiency for thermal design validation |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead plastic package with cathode band marking; 0.85 mm nominal width, 1.25 mm nominal length, 0.65 mm max height; designed for reflow soldering using footprint per Figure 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marked by bar on package; carries reverse-biased current during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low differential resistance | 50 Ω typical at IZ = 5 mA - improves regulation accuracy under varying load currents |
| Ultra-compact SMD package | SOD523 (SC-79) - enables placement in high-density layouts with <1.3 mm² board area |
| Wide operating temperature | −65 °C to +150 °C junction range - supports industrial and automotive under-hood environments |
| Controlled temperature coefficient | +12.4 to +16.0 mV/K - allows predictable drift compensation in temperature-sensitive references |
| Low leakage performance | ≤0.05 µA at 14.4 V reverse bias - minimizes error in high-impedance sensing or bias networks |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 18 V reference for adjustable LDO feedback divider in battery-powered IoT sensor nodes. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference, setting precise output voltage via resistor divider ratio. Use Value: ±2 % tolerance and 50 Ω rdiff ensure <±15 mV output deviation across load and temperature, reducing calibration overhead. |
Use Scenario: Protecting microcontroller GPIO pins from 24 V transients in industrial PLC input modules. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 18.9 V peak during ESD or inductive kick events. Use Value: 40 W non-repetitive peak power rating absorbs 100 µs surges without degradation, extending system reliability. |
| Low-Power Bias Network | Temperature-Compensated Reference |
|
Use Scenario: Generating 18 V bias for op-amp input stage in portable medical instrumentation. IC Role / Device Role / Timing Role: High-impedance voltage source supplying <100 µA to amplifier bias inputs. Use Value: 0.05 µA reverse leakage at 14.4 V prevents loading errors in nanoamp-level bias paths. |
Use Scenario: Stabilizing oscillator bias in RF front-end synthesizers requiring low-drift frequency control. IC Role / Device Role / Timing Role: Primary voltage reference whose temperature coefficient is actively compensated in circuit design. Use Value: Predictable +12.4 to +16.0 mV/K coefficient enables accurate passive or active compensation against ambient drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C18,115 | ±5 % tolerance (17.1–18.9 V same range, but wider distribution) | Acceptable where cost sensitivity outweighs tight regulation needs | Select for cost-driven consumer electronics where ±5 % voltage margin is sufficient |
| MMSZ5245B-7-F | 18 V nominal, ±5 %, SOD-123 package (larger footprint, 500 mW Ptot) | Higher power handling but requires 2.5× more board area | Choose when higher continuous power (500 mW) or legacy footprint compatibility is required |
Compared with BZX585-C18,115, the BZX585-B18,115 offers tighter tolerance for precision references; versus MMSZ5245B-7-F, it trades 200 mW lower power for 60 % smaller board area and improved thermal resistance to solder point.
Availability
BZX585-B18,115 is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and low-power bias network applications requiring stable component supply and guaranteed traceability.
Supply support for BZX585-B18,115 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and robustness.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-reliability voltage regulation in space-constrained industrial and consumer electronics.
FAQ
What is the maximum continuous forward current for BZX585-B18,115?
The absolute maximum forward current is 200 mA per Table 5. However, forward conduction is not its intended operating mode; the device is designed for reverse-bias Zener operation. Forward voltage is specified at 100 mA (1.1 V max), but sustained forward bias risks thermal overstress and is not recommended in functional designs.
Can BZX585-B18,115 be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing variations in breakdown voltage, causing current imbalance and potential thermal runaway when paralleled. For higher power, use a single higher-rated device like MMSZ5245B-7-F or implement active regulation instead.
How does the SOD523 package affect thermal performance compared to SOD-123?
The SOD523 package has higher thermal resistance (350 K/W junction-to-ambient vs. ~250 K/W for SOD-123), but its 65 K/W junction-to-solder-point value enables effective heat extraction through the cathode pad. This makes it thermally viable on properly designed PCBs with localized copper, despite smaller size.
Is BZX585-B18,115 suitable for automotive applications?
No - this part is not AEC-Q200 qualified. Nexperia explicitly states in Section 14 that non-automotive qualified products are unsuitable for automotive use. For automotive-grade Zeners, select the BZX84-A series or other AEC-Q200 certified alternatives.
BZX585-B18,115 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:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 700 mV
- 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-B18,115 FAQ
1.How can I place an order for BZX585-B18,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B18,115 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-B18,115 reliable?
The price and inventory of BZX585-B18,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B18,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B18,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B18,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B18,115?
BZX585-B18,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B18,115 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-B18,115?
For technical support, including BZX585-B18,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B18,115 requirements.
6.How does Aetrix verify that BZX585-B18,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B18,115 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-B18,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B18,115?
All BZX585-B18,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B18,115, 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-B18,115 part is unused and in its original packaging.
Return procedure for BZX585-B18,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-B18,115 Tags
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