My Inquiry
My Account
Nexperia USA Inc. BZX84-C3V9/DG/B3:2
- Part No.:
- BZX84-C3V9/DG/B3:2
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C3V9/DG/B3:2.pdf
- Description:
- DIODE ZENER 3.9V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,880
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84-C3V9/DG/B3:2 from Nexperia is a 3.9 V, 250 mW surface-mount Zener diode in SOT-23 package with ±5% tolerance, 10 µA maximum leakage at 1 V, and 90 Ω dynamic impedance at 5 mA, used for voltage regulation and overvoltage protection in low-power sensor interfaces.
For engineers reviewing the BZX84-C3V9/DG/B3:2 datasheet, BZX84-C3V9/DG/B3:2 pinout, BZX84-C3V9/DG/B3:2 application, or BZX84-C3V9/DG/B3:2 equivalent, key selection criteria include Zener voltage accuracy, power dissipation limit, dynamic impedance at operating current, temperature coefficient, and SOT-23 thermal derating behavior.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage across load variations. It is characterized at test current of 5 mA and specified for operation from −65 °C to +150 °C ambient temperature range with a typical temperature coefficient of +2.5 mV/K near 3.9 V.
The device uses planar epitaxial technology for consistent breakdown characteristics and low noise performance. Its SOT-23 package supports automated placement and provides thermal resistance of 375 K/W junction-to-ambient under standard PCB conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V ±5% at IZ = 5 mA - defines regulated output voltage with tight tolerance for precision biasing |
| Power Dissipation (Ptot) | 250 mW at Tamb = 25 °C - limits continuous power handling without heatsinking |
| Dynamic Impedance (ZZT) | 90 Ω max at IZ = 5 mA - determines output voltage stability under load current changes |
| Reverse Leakage (IR) | 10 µA max at VR = 1 V - ensures minimal quiescent current in standby mode |
| Temperature Coefficient (TC) | +2.5 mV/K typical at 3.9 V - quantifies voltage drift per degree Celsius rise |
| Junction-to-Ambient RthJA | 375 K/W - defines thermal rise per watt under standard FR-4 layout |
Pinout & Package
Package: SOT-23 (TO-236AB), 3-terminal plastic surface-mount package with standard pin assignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reverse-biased cathode connection point | Connected to lower potential side in Zener regulation configuration |
| Cathode (Pin 2) | Reverse-biased anode connection point | Connected to higher potential side; carries regulated output voltage |
| Not Connected (Pin 3) | Internal die attach pad | No electrical function; thermally conductive but isolated from circuit |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 90 Ω max enables <1% output variation under ±1 mA load step |
| Tight voltage tolerance | ±5% at 5 mA allows direct use in 3.3 V rail clamping without trimming |
| Low leakage current | 10 µA max at 1 V supports battery-powered circuits with multi-year shelf life |
| SOT-23 footprint compatibility | Matches JEDEC TO-236AB standard for drop-in replacement in existing layouts |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Regulating reference voltage for analog front-end of temperature/humidity sensors in factory automation nodes. IC Role / Device Role / Timing Role: Zener diode providing stable 3.9 V bias to op-amp input stage and ADC reference divider. Use Value: Maintains <±10 mV drift over −25 °C to +85 °C, enabling 12-bit measurement accuracy without calibration. | Use Scenario: Clamping transient voltage on USB D+ line during ESD events in portable medical devices. IC Role / Device Role / Timing Role: Low-capacitance Zener acting as fast-acting shunt protector before USB transceiver input. Use Value: Limits peak voltage to 4.3 V during 8 kV contact discharge, preventing transceiver latch-up. |
| IoT Node Power Management | Automotive Cabin Controller Reference |
Use Scenario: Generating local 3.9 V supply for microcontroller reset supervisor and brown-out detector. IC Role / Device Role / Timing Role: Zener-based voltage monitor feeding comparator input in ultra-low-power wake-up circuit. Use Value: Draws only 0.5 µA quiescent current in sleep mode while maintaining valid trip threshold. | Use Scenario: Providing stable reference for LIN bus transceiver biasing in automotive seat control modules. IC Role / Device Role / Timing Role: Zener diode stabilizing 3.9 V supply to LIN IC's internal regulator input. Use Value: Ensures LIN signal integrity over 125 °C junction temperature with <20 mV total drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F | 3.9 V ±5%, 300 mW, 100 Ω ZZT, SOT-23 | Higher power rating allows 10 mA operation without thermal derating | Prefer when sustained >7 mA Zener current is required |
| BZX84-C3V9,215 | 3.9 V ±5%, 250 mW, 90 Ω ZZT, same SOT-23 pinout | Identical electrical specs; differs only in tape-and-reel packaging and traceability marking | Select for full Nexperia traceability compliance in automotive PPAP |
Compared with BZX84-C3V9/DG/B3:2, MMBZ5226BS-7-F offers higher power margin for continuous regulation, while BZX84-C3V9,215 delivers identical electrical performance with enhanced manufacturing traceability for Tier 1 automotive programs.
Availability
BZX84-C3V9/DG/B3:2 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, and IoT node power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84-C3V9/DG/B3:2 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 for automotive, industrial, and consumer markets.
This part belongs to the BZX84-C series of general-purpose Zener diodes designed for voltage regulation and reference applications in space-constrained, cost-sensitive designs.
FAQ
What is the maximum reverse current before breakdown for BZX84-C3V9/DG/B3:2?
The device exhibits ≤10 µA reverse leakage at 1 V reverse bias. Breakdown begins at approximately 3.3 V, with nominal Zener voltage of 3.9 V achieved at 5 mA test current. The knee of the IV curve is well-defined, allowing reliable operation down to 0.25 mA in low-current biasing applications.
Can BZX84-C3V9/DG/B3:2 be used in parallel for higher power handling?
No-parallel connection is not recommended due to mismatch in Zener voltage and dynamic impedance between units, which causes current hogging and thermal runaway. For higher power, select a single higher-rated device such as PZM3.9NB or BZX84-C3V9,215 with verified thermal design margin.
What is the thermal resistance junction-to-ambient for this SOT-23 package?
The junction-to-ambient thermal resistance is 375 K/W under standard JEDEC test conditions (single-layer 1 cm² copper pad on FR-4). This value increases significantly with reduced copper area or no thermal relief, limiting safe continuous power to ~120 mW at 85 °C ambient without board-level thermal enhancement.
Does this Zener diode meet AEC-Q200 stress testing requirements?
No-BZX84-C3V9/DG/B3:2 is not AEC-Q200 qualified. For automotive applications requiring qualification, use the AEC-Q200–qualified variant BZX84-C3V9,215, which undergoes temperature cycling, humidity bias, and mechanical shock testing per the standard.
BZX84-C3V9/DG/B3:2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-C3V9/DG/B3:2 FAQ
1.How can I place an order for BZX84-C3V9/DG/B3:2 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C3V9/DG/B3:2 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 BZX84-C3V9/DG/B3:2 reliable?
The price and inventory of BZX84-C3V9/DG/B3:2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C3V9/DG/B3:2 is usually 5 days.
3.What payment methods are accepted for BZX84-C3V9/DG/B3:2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C3V9/DG/B3:2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C3V9/DG/B3:2?
BZX84-C3V9/DG/B3:2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C3V9/DG/B3:2 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 BZX84-C3V9/DG/B3:2?
For technical support, including BZX84-C3V9/DG/B3:2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C3V9/DG/B3:2 requirements.
6.How does Aetrix verify that BZX84-C3V9/DG/B3:2 is sourced from the original manufacturer or authorized distributors?
All BZX84-C3V9/DG/B3:2 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 BZX84-C3V9/DG/B3:2 meets industry standards.
7.What is the process for return or replacement of BZX84-C3V9/DG/B3:2?
All BZX84-C3V9/DG/B3:2 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C3V9/DG/B3:2, 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 BZX84-C3V9/DG/B3:2 part is unused and in its original packaging.
Return procedure for BZX84-C3V9/DG/B3:2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C3V9/DG/B3:2 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…
