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NXP Semiconductors BZX284-B20,115
- Part No.:
- BZX284-B20,115
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- SOD-110
- Datasheet:
-
BZX284-B20,115.pdf
- Description:
- DIODE ZENER 20V 400MW SOD110
- Quantity:
- Payment:
- Shipping:
Inventory:9,740
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Product details
Overview
BZX284-B20,115 from NXP Semiconductors is a ±2% tolerance, 20 V nominal Zener voltage regulator diode in a SOD110 ceramic SMD package, rated for 400 mW total power dissipation at 25 °C, with 30 Ω typical differential resistance at 5 mA test current and 16.4 mV/K temperature coefficient - used for precision low-power voltage reference and overvoltage protection in sensor signal conditioning circuits.
For engineers reviewing the BZX284-B20,115 datasheet, BZX284-B20,115 pinout, BZX284-B20,115 application, or BZX284-B20,115 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (315 K/W), reverse leakage (≤1.5 μA at 14 V), junction temperature limit (150 °C), and SOD110 footprint compatibility with space-constrained PCB layouts.
Technical Context
The BZX284-B20,115 operates as a two-terminal silicon Zener diode optimized for stable reverse-bias breakdown regulation. Its 20 V nominal Zener voltage is specified at IZtest = 5 mA, with differential resistance of 30 Ω (typ) to 225 Ω (max), enabling predictable voltage clamping under varying load currents.
Designed for surface-mount operation on standard FR-4 PCBs (11 × 25 × 1.6 mm), it exhibits a positive temperature coefficient of +16.4 mV/K - critical for biasing stability in temperature-varying environments - and supports continuous forward current up to 250 mA per Absolute Maximum Ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.6–20.4 V at IZ = 5 mA; ensures tight regulation window for 20 V reference designs |
| Power Dissipation (Ptot) | 400 mW at Tamb = 25 °C; defines maximum steady-state thermal load without derating |
| Differential Resistance (rdiff) | 30 Ω (typ), ≤225 Ω (max) at 5 mA; determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | +16.4 mV/K at 5 mA; quantifies voltage drift per degree Celsius rise in junction temperature |
| Reverse Leakage (IR) | ≤1.5 μA at VR = 14 V; limits standby current in high-impedance bias networks |
| Junction-to-Ambient Rth | 315 K/W on standard PCB; sets thermal rise per watt - critical for reliability in enclosed enclosures |
| Package | SOD110 ceramic SMD; 2.1 × 1.4 × 1.6 mm footprint with cathode marking - enables 0402-class board density |
Pinout & Package
Two-terminal device in SOD110 ceramic surface-mount package: anode (pin 1) and cathode (pin 2), with cathode identified by a visible mark on top surface per Fig.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward conduction terminal / low-side connection | Connected to circuit ground or lower potential node during Zener operation |
| Cathode (K) | Zener breakdown terminal / high-side connection | Connected to regulated voltage rail; polarity marking required for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter regulation than ±5% variants (e.g., BZX284-C20), reducing need for post-calibration in precision references |
| Low differential resistance (30 Ω typ) | Minimizes output voltage variation under ±1 mA load shifts - essential for stable biasing of op-amp input stages |
| Positive temperature coefficient (+16.4 mV/K) | Compensates for negative TC of other components (e.g., transistors) in mixed-TC reference circuits |
| SOD110 ceramic package | Provides superior moisture resistance vs. plastic SOD-323, supporting reliability in humid industrial environments |
| 400 mW power rating | Supports transient surge absorption (e.g., ESD clamp) without external series resistor in low-energy interfaces |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure sensors operating across −40 to +85 °C ambient. IC Role / Device Role / Timing Role: Zener reference diode providing fixed 20 V rail for sensor bridge biasing and ADC reference scaling. Use Value: ±2% tolerance and +16.4 mV/K TC enable <1.2% total voltage drift over full temperature range - meeting IEC 61000-4-5 surge immunity requirements. | Use Scenario: Clamping induced transients on USB VBUS line during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Low-capacitance (≤80 pF) shunt regulator absorbing 100 μs surges up to 12 A peak per IEC 61000-4-5 Level 3. Use Value: 400 mW rating and 315 K/W thermal resistance allow self-limiting clamping without thermal runaway during repeated 1 kV/500 A surges. |
| Programmable Logic Controller (PLC) Input Protection | Automotive Body Control Module Reference |
Use Scenario: Protecting 24 V digital input channels against load-dump transients and field-wiring faults in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Primary Zener clamp in series with current-limiting resistor, placed before optocoupler input stage. Use Value: 20 V breakdown voltage provides 4 V margin below 24 V nominal supply while maintaining <50 nA leakage at 18 V - preserving input high-state integrity. | Use Scenario: Generating stable 20 V reference for microcontroller ADC calibration in 12 V automotive body control modules. IC Role / Device Role / Timing Role: Precision voltage reference source feeding resistive divider network for internal bandgap comparison. Use Value: Ceramic SOD110 package withstands 1000+ thermal cycles per JESD22-A104, ensuring long-term stability in under-hood temperature cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX284-C20,115 | ±5% tolerance (19–21 V), higher max rdiff (200 Ω), same SOD110 package | Acceptable where cost sensitivity outweighs regulation accuracy; unsuitable for <0.5% system error budgets | Select when BOM cost reduction is prioritized over voltage stability across temperature and life |
| MMSZ4702T1G | 20 V ±5%, 500 mW rating, SOD-123 package (2.7 × 1.4 × 1.0 mm), 35 Ω rdiff (typ) | Larger footprint but higher power handling; plastic package less moisture-resistant than ceramic | Choose when higher surge energy absorption is needed and PCB area permits larger outline |
Compared with BZX284-C20,115 and MMSZ4702T1G, the BZX284-B20,115 delivers tighter voltage tolerance and ceramic-package reliability at the expense of lower power headroom and slightly larger thermal resistance - making it optimal for precision, humidity-sensitive, space-constrained applications.
Availability
BZX284-B20,115 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and programmable logic controller input protection requiring stable component supply and traceable sourcing.
Supply support for BZX284-B20,115 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 applications.
The BZX284 series was designed as a family of low-power, high-stability Zener diodes targeting precision voltage reference and transient suppression in space-constrained, high-reliability industrial and automotive electronics.
FAQ
What is the Zener voltage tolerance of the BZX284-B20,115?
The BZX284-B20,115 has a ±2% Zener voltage tolerance, meaning its nominal 20 V breakdown voltage is guaranteed between 19.6 V and 20.4 V when tested at 5 mA. This tighter tolerance compared to ±5% variants like BZX284-C20,115 supports higher-accuracy voltage referencing in analog front-ends and sensor interfaces where regulation stability is critical.
What is the maximum power dissipation rating for the BZX284-B20,115?
The BZX284-B20,115 is rated for 400 mW total power dissipation at an ambient temperature of 25 °C, as defined in the Absolute Maximum Ratings table. Derating is required above 25 °C at 1.27 mW/°C (based on Rth j-a = 315 K/W), limiting usable power to ~250 mW at 70 °C ambient - important for thermal design in enclosed industrial enclosures.
Does the BZX284-B20,115 have a positive or negative temperature coefficient?
The BZX284-B20,115 exhibits a positive temperature coefficient of +16.4 mV/K at 5 mA test current, meaning its Zener voltage increases linearly with junction temperature. This behavior is typical for Zener diodes above ~6 V and allows compensation against negative TC components in reference circuits - a key design consideration for wide-temperature-range applications.
What package type does the BZX284-B20,115 use, and what are its dimensions?
The BZX284-B20,115 uses the SOD110 very small ceramic SMD package, measuring 2.10 × 1.40 × 1.60 mm with a cathode identification mark. Its ceramic construction provides enhanced moisture resistance and thermal stability versus plastic alternatives like SOD-123, making it suitable for harsh-environment deployments where long-term parameter drift must be minimized.
What is the typical differential resistance of the BZX284-B20,115, and why does it matter?
The BZX284-B20,115 has a typical differential resistance of 30 Ω at 5 mA Zener test current, with a maximum of 225 Ω. This parameter directly affects load regulation: a lower rdiff means smaller output voltage change for a given shift in Zener current - critical for maintaining stable reference voltages in precision analog circuits and low-noise sensor signal chains.
BZX284-B20,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SOD-110
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 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-B20,115 FAQ
1.How can I place an order for BZX284-B20,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX284-B20,115 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-B20,115 reliable?
The price and inventory of BZX284-B20,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX284-B20,115 is usually 5 days.
3.What payment methods are accepted for BZX284-B20,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX284-B20,115 transactions.
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4.How is shipping managed for BZX284-B20,115?
BZX284-B20,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX284-B20,115 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-B20,115?
For technical support, including BZX284-B20,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX284-B20,115 requirements.
6.How does Aetrix verify that BZX284-B20,115 is sourced from the original manufacturer or authorized distributors?
All BZX284-B20,115 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-B20,115 meets industry standards.
7.What is the process for return or replacement of BZX284-B20,115?
All BZX284-B20,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX284-B20,115, 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-B20,115 part is unused and in its original packaging.
Return procedure for BZX284-B20,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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