My Inquiry
My Account
Nexperia USA Inc. BZX84W-B16X
- Part No.:
- BZX84W-B16X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B16X.pdf
- Description:
- DIODE ZENER 16V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,807
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-B16X from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing precise 16 V regulation at 5 mA with 200 Ω differential resistance and −12.4 mV/K temperature coefficient. It delivers stable reference voltage for power supply feedback loops, overvoltage protection circuits, and analog signal conditioning in space-constrained consumer and industrial PCBs.
For engineers reviewing the BZX84W-B16X datasheet, BZX84W-B16X pinout, BZX84W-B16X application, or BZX84W-B16X equivalent, this page provides verified Zener parameters including nominal voltage, tolerance, dynamic impedance, temperature coefficient, and thermal resistance - all confirmed from Nexperia's Rev. 2 (Jan 2023) product data sheet.
Technical Context
This Zener operates in reverse breakdown mode with a nominal working voltage of 16.0 V (min 15.7 V, max 16.3 V) at IZ = 5 mA. Its differential resistance of 200 Ω ensures low output impedance under regulation, while the negative temperature coefficient of −12.4 mV/K enables predictable drift compensation in temperature-sensitive references.
The device uses a planar epitaxial silicon process and is rated for 275 mW total power dissipation on FR4 PCB with single-sided copper. It supports non-repetitive surge capability up to 40 W (100 µs pulse) and exhibits 1.5 pF junction capacitance at 1 MHz and 0 V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 16.0 V at IZ = 5 mA - defines primary regulation point for feedback and clamping circuits |
| Tolerance | ±2% (B-series) - ensures tight voltage accuracy without post-production trimming |
| Differential Resistance | 200 Ω at IZ = 5 mA - determines load regulation error and ripple rejection performance |
| Temperature Coefficient | −12.4 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius for thermal design margining |
| Total Power Dissipation | 275 mW on FR4 PCB - sets maximum continuous DC power handling in standard layout |
| Junction-to-Ambient Rth | 455 K/W - defines thermal rise per watt in free-air mounting, critical for derating calculations |
| Reverse Leakage Current | 50 nA at VR = 11.2 V (0.7 × VZnom) - specifies off-state current in high-impedance bias networks |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package: 1.35 mm × 1.75 mm footprint, 0.95 mm height, 3-terminal configuration with exposed pad not present. Designed for reflow soldering using standard 0.55 mm × 0.6 mm solder paste apertures per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or thermal pad connection permitted |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference |
Key Features
| Feature | Design Value |
|---|---|
| Wide voltage range coverage | 2.4 V to 75 V in E24 steps - enables single-family sourcing across diverse supply rail requirements |
| Precision tolerance option | ±2% (B-series) - reduces need for binning or external calibration in voltage reference designs |
| Low junction capacitance | 1.5 pF at 1 MHz - minimizes high-frequency loading in RF bias and fast-switching protection circuits |
| High surge robustness | 40 W non-repetitive peak power (100 µs) - withstands transient overvoltage events without degradation |
| Standardized SOT323 footprint | Compatible with JEDEC SC-70 land pattern - ensures drop-in replacement and automated assembly compatibility |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
|
Use Scenario: Stabilizing output voltage in isolated flyback or buck converter feedback loop via optocoupler-coupled TL431 alternative. IC Role / Device Role / Timing Role: Zener diode provides fixed 16 V reference to bias optocoupler LED, enabling closed-loop regulation without dedicated shunt regulator IC. Use Value: Eliminates need for external voltage divider and improves loop stability by reducing component count and parasitic capacitance. |
Use Scenario: Protecting microcontroller GPIO pins from accidental 24 V field wiring faults in industrial I/O modules. IC Role / Device Role / Timing Role: Placed between I/O line and ground to clamp transients above 16.3 V, diverting surge current away from sensitive input structures. Use Value: Limits peak voltage to safe level (≤16.3 V) with <50 nA leakage at operating bias, preserving signal integrity during normal operation. |
| ADC Reference Buffer | High-Frequency Bias Network |
|
Use Scenario: Generating stable 16 V reference for 12-bit SAR ADC driver amplifier in precision sensor signal chain. IC Role / Device Role / Timing Role: Supplies low-noise, temperature-compensated bias to op-amp stage preceding ADC input, minimizing offset drift. Use Value: −12.4 mV/K coefficient allows predictable drift modeling; 200 Ω impedance enables direct buffering without gain-stage loading errors. |
Use Scenario: Biasing gate of RF MOSFET in 2.4 GHz Wi-Fi front-end power amplifier stage. IC Role / Device Role / Timing Role: Provides clean DC bias point while presenting only 1.5 pF capacitance to RF path, avoiding resonance shifts. Use Value: Enables stable DC operating point without degrading S-parameters or causing impedance mismatch at RF frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C16 | ±5% tolerance (C-series), 200 Ω rdif, −12.4 mV/K SZ, same SOT323 package | Higher voltage variation (15.2–16.8 V) reduces accuracy in precision references | Select when cost sensitivity outweighs tight regulation requirement |
| MMSZ4687 | ±5% tolerance, 16 V nominal, 225 Ω rdif, −12.5 mV/K, SOD-123 package (larger footprint) | 0.015 cm² vs. 0.0024 cm² area - unsuitable for ultra-dense layouts | Choose only if board-level rework tolerance or thermal mass requirements justify larger package |
Compared with BZX84W-B16X, BZX84C16 trades voltage accuracy for lower unit cost, while MMSZ4687 sacrifices miniaturization for higher surge rating and legacy footprint compatibility - making the BZX84W-B16X optimal for space-constrained, precision-regulated designs requiring ±2% stability.
Availability
BZX84W-B16X is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and precision analog reference applications requiring stable component supply, consistent parametric performance, and long-term obsolescence mitigation.
Supply support for BZX84W-B16X 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, with manufacturing rooted in process control and automotive-grade quality systems.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, thermally efficient voltage regulation in consumer, industrial, and computing applications where SMT miniaturization and parametric consistency are critical.
FAQ
What is the maximum continuous forward current for BZX84W-B16X?
The absolute maximum forward current is 200 mA per Nexperia's limiting values table. However, forward conduction is not its intended operating mode; sustained forward bias above 0.9 V at 10 mA risks thermal overstress due to 275 mW power limit and 455 K/W thermal resistance. It should only be forward-biased briefly during circuit power-up sequencing.
Can BZX84W-B16X replace a 1N4744A in existing designs?
No - the 1N4744A is a DO-41 through-hole Zener with 15 V nominal voltage, 1 W power rating, and 16 Ω impedance. BZX84W-B16X has higher voltage (16 V), lower power (275 mW), higher impedance (200 Ω), and SOT323 packaging. Direct substitution would cause regulation inaccuracy, thermal overload, and solder joint reliability issues without board redesign.
How does the 'n.c.' pin affect PCB layout?
Pin 2 is internally unconnected and must remain electrically floating - no trace, pour, or thermal relief may contact it. Routing traces adjacent to it is acceptable, but connecting it to ground or any net violates the device specification and may induce leakage or parametric shift due to stray capacitance or unintended coupling.
Is BZX84W-B16X suitable for automotive applications?
No - per Nexperia's revision history, the BZX84W series was explicitly changed to non-automotive qualification in Rev. 2 (Jan 2023). It lacks AEC-Q200 stress testing, extended temperature validation, and failure rate reporting required for automotive use. For automotive designs, Nexperia's BZX84W-Q series (e.g., BZX84W-Q16) must be specified instead.
BZX84W-B16X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 11.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B16X FAQ
1.How can I place an order for BZX84W-B16X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B16X 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 BZX84W-B16X reliable?
The price and inventory of BZX84W-B16X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B16X is usually 5 days.
3.What payment methods are accepted for BZX84W-B16X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B16X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B16X?
BZX84W-B16X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B16X 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 BZX84W-B16X?
For technical support, including BZX84W-B16X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B16X requirements.
6.How does Aetrix verify that BZX84W-B16X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B16X 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 BZX84W-B16X meets industry standards.
7.What is the process for return or replacement of BZX84W-B16X?
All BZX84W-B16X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B16X, 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 BZX84W-B16X part is unused and in its original packaging.
Return procedure for BZX84W-B16X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B16X 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…
