My Inquiry
My Account
NXP Semiconductors BZX284-B18,115
- Part No.:
- BZX284-B18,115
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- SOD-110
- Datasheet:
-
BZX284-B18,115.pdf
- Description:
- DIODE ZENER 18V 400MW SOD110
- Quantity:
- Payment:
- Shipping:
Inventory:9,968
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX284-B18,115 from NXP Semiconductors is a ±2% tolerance, 18 V nominal Zener voltage regulator diode in a SOD110 ceramic SMD package, rated for 400 mW total power dissipation at 25 °C ambient, with 25 Ω typical differential resistance at 5 mA test current and +14.4 mV/K temperature coefficient - used for precision low-power voltage reference and overvoltage clamping in sensor signal conditioning circuits.
For engineers reviewing the BZX284-B18,115 datasheet, BZX284-B18,115 pinout, BZX284-B18,115 application, or BZX284-B18,115 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (315 K/W), reverse leakage (≤50 nA at 12.6 V), SOD110 footprint compatibility, and junction temperature limit (150 °C).
Technical Context
The BZX284-B18,115 operates as a two-terminal silicon Zener diode optimized for stable voltage regulation under reverse bias. Its 18 V nominal Zener voltage is specified at IZtest = 5 mA, with differential resistance of 25 Ω (typ) to 225 Ω (max) and temperature coefficient of +14.4 mV/K (typ), indicating positive drift above ~6.8 V.
Designed for surface-mount use on standard PCBs (11 × 25 × 1.6 mm), it delivers regulated reference voltage with ≤50 nA reverse current at VR = 0.7 × VZnom = 12.6 V, and supports non-repetitive surge currents up to 1.5 A (100 μs pulse) per absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 17.6–18.4 V at IZ = 5 mA; ensures tight 18 V regulation in low-current reference paths |
| Tolerance | ±2%; enables high-accuracy voltage thresholds without external trimming |
| Differential Resistance rdiff | 25 Ω (typ), ≤225 Ω (max) at 5 mA; determines output impedance and load regulation error |
| Temperature Coefficient SZ | +14.4 mV/K (typ); quantifies voltage drift with junction temperature rise |
| Power Dissipation Ptot | 400 mW at Tamb = 25 °C; defines maximum steady-state thermal load on PCB |
| Reverse Leakage IR | ≤50 nA at VR = 12.6 V (0.7 × VZnom); critical for low-power standby and battery-backed circuits |
| Junction Temperature Tj | 150 °C max; sets upper thermal operating limit for reliability under sustained bias |
Pinout & Package
Two-terminal device in SOD110 ceramic SMD package: anode (pin 1) and cathode (pin 2), with cathode identified by a marking band on top surface. Package dimensions: 2.10 × 1.40 × 1.60 mm (L × W × H), footprint compatible with JEDEC-standard SOD110 land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse bias return path | Connected to lower-potential node in Zener clamp or shunt regulator configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 18 V reference relative to anode; marked with band on package top |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct use in 18 V reference designs without calibration or trimming components |
| SOD110 ceramic SMD package | Offers superior thermal stability vs. plastic packages and reliable moisture resistance for industrial environments |
| 400 mW power rating at 25 °C | Supports moderate-current shunt regulation (e.g., 22 mA at 18 V) with standard PCB copper area |
| +14.4 mV/K temperature coefficient | Allows predictable compensation in temperature-sensitive analog circuits using matched diodes |
| ≤50 nA reverse leakage at 12.6 V | Minimizes quiescent current in always-on protection circuits and battery-powered sensors |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller I/O Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 18 V bias to Wheatstone bridge, compensating for supply ripple. Use Value: ±2% VZ tolerance and +14.4 mV/K SZ enable <1% full-scale error across −40 to +85 °C without software correction. |
Use Scenario: Clamping GPIO pins against ESD and transient overvoltage in automotive body control units. IC Role / Device Role / Timing Role: Two-terminal Zener clamp between MCU I/O line and ground, conducting above 18 V. Use Value: 400 mW power rating and 1.5 A non-repetitive surge capability absorb IEC 61000-4-2 contact discharge events without failure. |
| Low-Power Reference for ADCs | Overvoltage Detection in DC Power Rails |
Use Scenario: Generating stable reference for 12-bit SAR ADCs in portable medical monitors. IC Role / Device Role / Timing Role: Low-noise Zener reference source feeding ADC REF+ input via RC filter. Use Value: ≤50 nA reverse leakage prevents loading of high-impedance reference dividers, preserving ADC accuracy. |
Use Scenario: Monitoring 24 V industrial bus for overvoltage faults before downstream DC-DC converters. IC Role / Device Role / Timing Role: Zener-based comparator input threshold set to 18 V, triggering shutdown at >20 % overvoltage. Use Value: Tight 17.6–18.4 V VZ window ensures deterministic trip point with minimal hysteresis design overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BZT52-B18 | Same SOD123 package (larger than SOD110), ±2% tolerance, 18 V VZ, 500 mW Ptot, 40 Ω rdiff (typ) | Higher power rating but larger footprint; requires PCB layout change | Select when higher surge robustness is needed and board space allows SOD123 |
| Vishay BZX84-C18 | SOT-23 package, ±5% tolerance, 18 V VZ, 300 mW Ptot, 45 Ω rdiff (typ), 100 nA IR at 12.6 V | Looser tolerance and higher leakage; lower cost, widely available in tape-and-reel | Select for cost-sensitive consumer applications where ±5% VZ is acceptable |
Compared with BZX284-B18,115, the BZT52-B18 offers higher surge margin but demands more PCB area, while the BZX84-C18 trades precision and leakage performance for cost and availability - making the BZX284-B18,115 optimal for space-constrained industrial references requiring ±2% accuracy and ultra-low leakage.
Availability
BZX284-B18,115 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, microcontroller I/O protection, and low-power ADC reference applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BZX284-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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The BZX284 series was designed specifically for high-stability, low-power voltage reference and clamping in space-constrained SMD applications - emphasizing tight tolerance, low leakage, and ceramic-package reliability.
FAQ
What is the Zener voltage tolerance of the BZX284-B18,115?
The BZX284-B18,115 has a ±2% Zener voltage tolerance, meaning its nominal 18 V breakdown voltage is guaranteed between 17.6 V and 18.4 V when tested at 5 mA. This tight tolerance eliminates the need for post-assembly calibration in precision reference designs and is confirmed in Table 1 of the NXP datasheet.
What package type does the BZX284-B18,115 use?
The BZX284-B18,115 uses the SOD110 very small ceramic SMD package, measuring 2.10 × 1.40 × 1.60 mm with a cathode identification band. Its ceramic construction provides better thermal stability and moisture resistance than plastic equivalents like SOD123 or SOT-23, and is explicitly defined in the Package Outline section of the NXP datasheet.
What is the maximum reverse leakage current for the BZX284-B18,115?
The BZX284-B18,115 exhibits ≤50 nA reverse leakage current at VR = 12.6 V (0.7 × VZnom), as specified in the Electrical Characteristics table. This ultra-low leakage supports energy-efficient operation in battery-powered systems and high-impedance reference networks where current draw must be minimized.
Can the BZX284-B18,115 be used in high-temperature environments?
Yes - the BZX284-B18,115 has a maximum junction temperature of 150 °C and a thermal resistance of 315 K/W (junction-to-ambient, mounted on 11 × 25 × 1.6 mm PCB). When derated per the datasheet's thermal curves, it remains functional up to +125 °C ambient in properly laid out industrial PCBs, making it suitable for under-hood or factory-floor applications.
How does the temperature coefficient of the BZX284-B18,115 affect circuit performance?
The BZX284-B18,115 has a typical temperature coefficient of +14.4 mV/K, meaning its Zener voltage increases by ~14.4 mV per degree Celsius rise in junction temperature. This positive drift is characteristic of Zeners above ~6.8 V and must be accounted for in wide-temperature-range precision references - e.g., a 60 °C rise causes ~0.86 V shift, which is manageable with system-level compensation or matching techniques.
BZX284-B18,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SOD-110
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 20 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-110
BZX284-B18,115 FAQ
1.How can I place an order for BZX284-B18,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX284-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 BZX284-B18,115 reliable?
The price and inventory of BZX284-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 BZX284-B18,115 is usually 5 days.
3.What payment methods are accepted for BZX284-B18,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX284-B18,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX284-B18,115?
BZX284-B18,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX284-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 BZX284-B18,115?
For technical support, including BZX284-B18,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX284-B18,115 requirements.
6.How does Aetrix verify that BZX284-B18,115 is sourced from the original manufacturer or authorized distributors?
All BZX284-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 BZX284-B18,115 meets industry standards.
7.What is the process for return or replacement of BZX284-B18,115?
All BZX284-B18,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX284-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 BZX284-B18,115 part is unused and in its original packaging.
Return procedure for BZX284-B18,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX284-B18,115 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
