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NXP Semiconductors BZX284-B39,115
- Part No.:
- BZX284-B39,115
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- SOD-110
- Datasheet:
-
BZX284-B39,115.pdf
- Description:
- DIODE ZENER 39V 400MW SOD110
- Quantity:
- Payment:
- Shipping:
Inventory:8,538
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Product details
Overview
BZX284-B39,115 from NXP Semiconductors is a ±2% tolerance Zener voltage regulator diode in a SOD110 ceramic SMD package, rated for 39 V nominal working voltage at 2 mA test current, 400 mW total power dissipation, and 300 Ω typical differential resistance at 2 mA. It serves as a precision low-power voltage reference in power supply feedback paths, overvoltage protection circuits, and analog signal conditioning stages.
For engineers reviewing the BZX284-B39,115 datasheet, BZX284-B39,115 pinout, BZX284-B39,115 application, or BZX284-B39,115 equivalent, key selection criteria include its 39 V Zener voltage tolerance (±2%), low temperature coefficient (+25 mV/K), 58 pF diode capacitance at 0 V, and suitability for space-constrained SMD designs requiring stable regulation below 400 mW.
Technical Context
The BZX284-B39,115 operates as a reverse-biased Zener diode with a nominal breakdown voltage of 38.2–39.8 V at 2 mA test current, exhibiting a positive temperature coefficient of +25 mV/K - indicating increasing VZ with junction temperature. Its differential resistance of ≤300 Ω at 2 mA ensures stable regulation under moderate load variation.
Designed for surface-mount use in the SOD110 package, it features a thermal resistance of 315 K/W (junction-to-ambient, on 11 × 25 × 1.6 mm PCB), limiting continuous operation to ≤150 °C junction temperature. Reverse leakage remains ≤50 nA at 0.7 × VZnom (27.3 V), supporting low-power biasing and sensing roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 38.2–39.8 V at IZ = 2 mA - defines precise regulation point for feedback or clamping |
| Tolerance | ±2% - enables tighter output voltage control vs. ±5% variants in critical references |
| Differential Resistance (rdiff) | ≤300 Ω at IZ = 2 mA - determines regulation stiffness against current changes |
| Temperature Coefficient (SZ) | +25 mV/K at IZ = 2 mA - quantifies VZ drift per degree rise in junction temperature |
| Diode Capacitance (Cd) | 58 pF at f = 1 MHz, VR = 0 V - impacts high-frequency noise filtering and stability in feedback loops |
| Total Power Dissipation (Ptot) | 400 mW at Tamb = 25 °C - sets maximum steady-state power handling on standard PCB |
| Reverse Leakage (IR) | ≤50 nA at VR = 27.3 V (0.7 × VZnom) - ensures minimal quiescent current in standby modes |
Pinout & Package
Package: SOD110 - very small ceramic rectangular surface-mounted package (2.10 × 1.40 × 1.60 mm), cathode marked with band on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (1) | Forward conduction terminal / low-side connection | Connected to ground or lower potential node in Zener regulation configuration |
| Cathode (2) | Zener breakdown terminal / high-side connection | Connected to input rail or regulated node; reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter output voltage accuracy in feedback networks without external trimming |
| SOD110 ceramic SMD package | Supports automated assembly and high-density layouts with thermal reliability up to 150 °C junction |
| Low 50 nA reverse leakage at 27.3 V | Minimizes standby current draw in battery-powered or energy-sensitive applications |
| +25 mV/K temperature coefficient | Predictable VZ increase with temperature aids compensation in mixed-signal systems |
| 400 mW power rating with 315 K/W Rth j-a | Allows direct PCB mounting without heatsinking for ≤100 mW average dissipation |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
|
Use Scenario: Stabilizing output voltage in isolated DC-DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Zener reference providing precise 39 V threshold to TL431 or optocoupler LED drive circuit. Use Value: ±2% tolerance ensures <±1% output regulation error; low Cd avoids phase shift in feedback loop. |
Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 39 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting excess energy to ground when input exceeds 39 V. Use Value: 300 Ω rdiff limits clamping voltage overshoot; 400 mW rating handles short-duration transients. |
| ADC Reference Buffer | Current Source Biasing |
|
Use Scenario: Generating stable 39 V reference for high-resolution SAR ADC driver amplifiers. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source feeding op-amp bias network. Use Value: +25 mV/K SZ allows predictable thermal tracking; 50 nA IR prevents loading errors in high-Z nodes. |
Use Scenario: Setting constant current in LED driver or sensor excitation circuits via series resistor. IC Role / Device Role / Timing Role: Fixed-voltage node establishing I = (Vin − 39 V)/R for programmable current sink. Use Value: Tight ±2% VZ ensures <±2% current accuracy; SOD110 footprint saves board area in multi-channel designs. |
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-B39 | Same SOD123 package (2.7 × 1.6 mm), ±2% tolerance, 38–40 V VZ, 500 mW Ptot, higher rdiff (≤600 Ω) | Larger footprint; higher power rating suits higher-current clamping but less space-efficient | Select BZT52-B39 only if >400 mW dissipation or SOD123 compatibility is required |
| Vishay BZX84-C39 | SOT-23 package, ±5% tolerance, 37–41 V VZ, 300 mW Ptot, rdiff ≤600 Ω, higher IR (≤100 nA) | Smaller outline but looser tolerance and higher leakage limit precision reference use | Choose BZX84-C39 only for cost-sensitive, non-critical regulation where ±5% is acceptable |
Compared with BZX284-B39,115, the BZT52-B39 offers higher power headroom in a larger package, while the BZX84-C39 trades tolerance and leakage performance for smaller size and lower cost - making BZX284-B39,115 optimal for space-constrained, precision 39 V reference designs.
Availability
BZX284-B39,115 is available at Aetrix Electronics and suitable for power supply feedback references, overvoltage clamp protection, ADC reference buffering, current source biasing, and low-power voltage monitoring requiring stable component supply and consistent ±2% Zener tolerance.
Supply support for BZX284-B39,115 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 consumer applications.
The BZX284 series was designed specifically for low-power, high-precision voltage regulation in space-constrained SMD applications - emphasizing tight tolerance, stable temperature behavior, and robust ceramic packaging for reliability in industrial environments.
FAQ
What is the nominal Zener voltage and test condition for BZX284-B39,115?
The BZX284-B39,115 has a nominal Zener voltage of 39 V, specified at a test current of 2 mA. Its guaranteed range is 38.2 V to 39.8 V under those conditions, reflecting its ±2% tolerance grade. This value is measured at Tj = 25 °C and defines the primary regulation point used in circuit design calculations for the BZX284-B39,115.
Does BZX284-B39,115 have a positive or negative temperature coefficient?
The BZX284-B39,115 exhibits a positive temperature coefficient of +25 mV/K at IZ = 2 mA, meaning its Zener voltage increases by approximately 25 mV for every 1 K rise in junction temperature. This behavior is confirmed in Table 2 of the NXP datasheet and is typical for Zener diodes in the 30–50 V range, allowing predictable thermal drift modeling in the BZX284-B39,115's operating envelope.
What is the maximum power dissipation rating for BZX284-B39,115?
The BZX284-B39,115 has a maximum total power dissipation of 400 mW at ambient temperature of 25 °C, as defined in the Absolute Maximum Ratings table. This rating assumes mounting on a standard 11 × 25 × 1.6 mm PCB; derating is required above 25 °C ambient, following the 315 K/W thermal resistance (Rth j-a) to maintain safe junction temperatures below 150 °C for reliable long-term operation of the BZX284-B39,115.
What package type does BZX284-B39,115 use, and what are its dimensions?
The BZX284-B39,115 uses the SOD110 package - a very small ceramic rectangular surface-mount device measuring 2.10 mm × 1.40 mm × 1.60 mm (length × width × height). Its cathode is identified by a band on the top surface, and it complies with JEDEC and IEC standards for compact, thermally robust Zener diode packaging - a key differentiator from plastic SOD-323 or SOT-23 alternatives for the BZX284-B39,115.
How does the differential resistance of BZX284-B39,115 affect regulation performance?
The BZX284-B39,115 has a typical differential resistance of 300 Ω at 2 mA, with a maximum of 300 Ω specified. This parameter directly impacts regulation accuracy: for a 1 mA change in Zener current, output voltage shifts by ~300 mV. Lower rdiff improves load regulation - making the BZX284-B39,115 suitable for applications demanding stable voltage under modest current variation, unlike higher-rdiff alternatives such as the BZX84-C39.
BZX284-B39,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SOD-110
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-B39,115 FAQ
1.How can I place an order for BZX284-B39,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX284-B39,115 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-B39,115 reliable?
The price and inventory of BZX284-B39,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX284-B39,115 is usually 5 days.
3.What payment methods are accepted for BZX284-B39,115?
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BZX284-B39,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX284-B39,115 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-B39,115?
For technical support, including BZX284-B39,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX284-B39,115 requirements.
6.How does Aetrix verify that BZX284-B39,115 is sourced from the original manufacturer or authorized distributors?
All BZX284-B39,115 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-B39,115 meets industry standards.
7.What is the process for return or replacement of BZX284-B39,115?
All BZX284-B39,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX284-B39,115, 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-B39,115 part is unused and in its original packaging.
Return procedure for BZX284-B39,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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