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Nexperia USA Inc. BZX384-B18,115
- Part No.:
- BZX384-B18,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B18,115.pdf
- Description:
- DIODE ZENER 18V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:39,636
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Product details
Overview
BZX384-B18,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 18 V nominal breakdown voltage at 5 mA, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves as a precision reference or overvoltage clamp in low-power analog supply rails, sensor biasing circuits, and microcontroller I/O protection networks.
For engineers reviewing the BZX384-B18,115 datasheet, BZX384-B18,115 pinout, BZX384-B18,115 application, or BZX384-B18,115 equivalent, key selection criteria include its 18 V Zener voltage tolerance (±2 %), thermal resistance (110 K/W junction-to-solder point), differential resistance (≤225 Ω at 5 mA), reverse current (≤0.05 μA at 14.4 V), and SOD323 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates in reverse-bias breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its Zener mechanism provides predictable regulation with temperature coefficient of +12.6 mV/K at 5 mA, enabling predictable drift compensation in reference designs.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it delivers 300 mW continuous dissipation at ≤25 °C ambient and withstands 40 W transient surges (100 μs, square wave). The cathode-anode polarity is marked by a bar on the SOD323 body per IEC 60747-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.6 V to 18.4 V at IZ = 5 mA - defines regulation setpoint with ±2 % tolerance for stable reference generation |
| Differential Resistance (rdif) | ≤225 Ω at IZ = 5 mA - determines output impedance and load regulation error under current variation |
| Reverse Current (IR) | ≤0.05 μA at VR = 14.4 V - ensures minimal leakage in standby or high-impedance sensing nodes |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables use as low-drop clamping diode in bidirectional protection schemes |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 μs - supports transient overvoltage suppression without permanent damage |
| Junction Temperature (Tj) | −65 °C to +150 °C - allows operation in industrial ambient environments with adequate PCB thermal relief |
| Thermal Resistance (Rth(j-sp)) | 110 K/W - quantifies heat transfer efficiency from junction to cathode solder point on standard FR4 layout |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package: 2-terminal, 1.35 mm × 0.85 mm body, 0.45 mm pitch, 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 optical inspection |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-bias path for Zener conduction during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMD package | SOD323 footprint (1.35 × 0.85 mm) enables placement in space-constrained consumer and portable electronics |
| Tight voltage tolerance | ±2 % at 5 mA ensures consistent regulation across production batches without post-assembly trimming |
| Controlled temperature coefficient | +12.6 mV/K at 5 mA allows predictable drift modeling in temperature-compensated reference circuits |
| High surge robustness | 40 W non-repetitive peak power rating supports IEC 61000-4-5 level 3 surge immunity in industrial interfaces |
| Low leakage performance | 0.05 μA max reverse current at 80 % VZ minimizes quiescent power loss in battery-powered sensor nodes |
Applications
| Power Supply Reference | Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 18 V reference for ADC voltage dividers in industrial data acquisition modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference potential independent of input rail fluctuations. Use Value: Enables <1 % full-scale error in 12-bit measurements despite ±10 % input supply variation due to tight 18 V tolerance and low rdif. |
Use Scenario: Biasing photodiode anodes in optical smoke detectors requiring stable reverse voltage. IC Role / Device Role / Timing Role: Precision voltage source establishing fixed depletion region width for linear photocurrent response. Use Value: Maintains <±0.5 % bias stability over −25 °C to +70 °C via known +12.6 mV/K TC, reducing calibration drift. |
| Microcontroller I/O Protection | Overvoltage Clamp |
|
Use Scenario: Clamping 3.3 V GPIO lines against ESD transients in automotive body control modules. IC Role / Device Role / Timing Role: Low-capacitance (≤70 pF) Zener shunting excess voltage to ground before IC damage threshold. Use Value: Limits pin voltage to ≤18.4 V during 8 kV HBM ESD events while adding <0.5 pF parasitic capacitance to signal path. |
Use Scenario: Protecting 15 V DC-DC converter feedback resistors from input surges in telecom power supplies. IC Role / Device Role / Timing Role: Fast-acting clamp diverting >1 A surge current away from sensitive feedback network. Use Value: Absorbs 40 W transient energy within 100 μs without degradation, preserving loop stability during fault recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245BS-7-F | 18 V ±5 % tolerance, 200 mW Ptot, SOT-23 package (larger footprint) | Higher power derating above 50 °C ambient; less suitable for ultra-dense layouts | Select when cost sensitivity outweighs size constraints and ±5 % tolerance is acceptable |
| BZX384-C18,115 | 18 V ±5 % tolerance, identical SOD323 package and 300 mW rating | Lower test current (2 mA) and higher rdif (≤300 Ω) reduce regulation accuracy under load | Select for non-critical biasing where tighter tolerance is unnecessary and cost reduction is prioritized |
Compared with BZX384-B18,115, MMBZ5245BS-7-F trades package size and tolerance for lower unit cost, while BZX384-C18,115 retains identical form factor but sacrifices regulation precision-making the B-series optimal for applications demanding both compactness and ±2 % stability.
Availability
BZX384-B18,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical devices, and telecom power management systems requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX384-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 focused on high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.
The BZX384 series targets low-power voltage reference and protection applications in consumer, industrial, and communications equipment, emphasizing small-footprint reliability and tight parametric consistency across voltage grades.
FAQ
What is the maximum continuous power dissipation for BZX384-B18,115?
The BZX384-B18,115 has a total power dissipation limit of 300 mW at ambient temperatures ≤25 °C when mounted on a standard FR4 PCB with single-sided copper. Derating begins linearly above 25 °C at 2.4 mW/°C, reaching zero dissipation at 150 °C junction temperature.
How is polarity identified on the BZX384-B18,115 package?
Polarity is indicated by a marking bar on the top surface of the SOD323 package, aligned with Pin 1 (cathode). This matches the simplified outline in Nexperia's datasheet Figure 11 and corresponds to the cathode symbol (K) in Table 2 pinning information.
Does BZX384-B18,115 meet automotive qualification standards?
No. BZX384-B18,115 is not automotive-qualified. Per Nexperia's revision history (Table 10), the BZX384_SER series was changed to non-automotive qualification in Rev. 4 (2023). Automotive alternatives require explicit -Q suffix parts, such as BZX384-B18-Q.
What is the typical Zener impedance at 5 mA for this part?
The maximum differential resistance (rdif) is specified as 225 Ω at IZ = 5 mA and Tj = 25 °C. This value represents dynamic impedance in the breakdown region and directly impacts regulation accuracy under varying load currents.
BZX384-B18,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- Package/Case:
- SC-76, SOD-323
- 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 @ 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-323
BZX384-B18,115 FAQ
1.How can I place an order for BZX384-B18,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-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 BZX384-B18,115 reliable?
The price and inventory of BZX384-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 BZX384-B18,115 is usually 5 days.
3.What payment methods are accepted for BZX384-B18,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B18,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B18,115?
BZX384-B18,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-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 BZX384-B18,115?
For technical support, including BZX384-B18,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B18,115 requirements.
6.How does Aetrix verify that BZX384-B18,115 is sourced from the original manufacturer or authorized distributors?
All BZX384-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 BZX384-B18,115 meets industry standards.
7.What is the process for return or replacement of BZX384-B18,115?
All BZX384-B18,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-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 BZX384-B18,115 part is unused and in its original packaging.
Return procedure for BZX384-B18,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B18,115 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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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
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MM5Z5V1ST1G
onsemi
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