My Inquiry
My Account
onsemi BZX84C4V3LT1
- Part No.:
- BZX84C4V3LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C4V3LT1.pdf
- Description:
- DIODE ZENER 4.3V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84C4V3LT1 from onsemi is a 4.3 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 90 Ω dynamic impedance at 5 mA test current and 3 µA reverse leakage at 1 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the BZX84C4V3LT1 datasheet, pinout, applications, or equivalent options, key selection factors include its 4.3 V nominal Zener voltage, ±5% tolerance, 90 Ω Zener impedance at IZT = 5 mA, ESD rating >16 kV (HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its cathode-anode terminals. Its Zener voltage is specified at three test currents (1 mA, 5 mA, 20 mA), with temperature coefficient of −3.5 mV/°C and capacitance of 450 pF at 0 V bias and 1 MHz.
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), with thermal resistance of 556 °C/W on FR-5 board and junction temperature range from −65°C to +150°C. It meets UL 94 V-0 flammability rating and Pb-free (G-suffix) compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.0–4.6 V at 5 mA - defines clamping threshold for overvoltage protection or reference stability |
| Power Dissipation (PD) | 225 mW on FR-5 board - limits continuous current to ~52 mA at 4.3 V without derating |
| Zener Impedance (ZZT) | 90 Ω at 5 mA - determines regulation stiffness under varying load current |
| Reverse Leakage (IR) | 3 µA at 1 V - ensures minimal quiescent current in standby or sensing circuits |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling in automated assembly and end-use environments |
| Capacitance (C) | 450 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent nodes |
| Temperature Coefficient | −3.5 mV/°C - enables predictable drift compensation in temperature-stable references |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount package with 3 terminals: anode (pin 1), no connection (pin 2), cathode (pin 3); polarity indicated by band on cathode side; UL 94 V-0 rated thermosetting plastic case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node during normal operation |
| 2 | No Connection | Internally unconnected; must remain floating - not used for thermal or electrical purposes |
| 3 | Cathode | Breakdown terminal; connects to higher-potential node to enable Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free (G-suffix) construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles |
| 225 mW FR-5 power rating | Enables use in space-constrained battery-powered devices without external heatsinking |
| Tight 5% Zener tolerance | Reduces need for post-assembly calibration in voltage-monitoring circuits |
| ESD Class 3 (>16 kV HBM) | Eliminates need for external ESD protection in handheld product front-end stages |
| Optimized for automated placement | Standard SOT-23 footprint supports high-yield pick-and-place at >30,000 UPH |
Applications
| Portable Power Monitoring | USB Interface Clamp |
|---|---|
Use Scenario: Monitoring Li-ion battery voltage in Bluetooth earbuds using a microcontroller ADC input. IC Role / Device Role / Timing Role: Zener reference providing known 4.3 V rail for ADC scaling and overvoltage detection. Use Value: Enables accurate state-of-charge estimation within ±2% error margin across −20°C to +70°C ambient. |
Use Scenario: Protecting USB D+ and D− lines from ESD transients in smartphone accessory docks. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed between data line and ground. Use Value: Clamps fast-rising ESD pulses to <5 V peak while adding <450 pF loading compatible with USB 2.0 signal integrity. |
| Low-Power Sensor Biasing | Microcontroller Reset Circuit |
Use Scenario: Providing stable bias voltage for analog output sensors in smart home motion detectors. IC Role / Device Role / Timing Role: Precision shunt regulator supplying 4.3 V to op-amp supply rails and sensor excitation. Use Value: Maintains sensor output linearity within ±0.5% over 10-year field life due to low tempco and leakage. |
Use Scenario: Generating a clean reset signal for ARM Cortex-M0+ MCU during brown-out conditions. IC Role / Device Role / Timing Role: Zener-based voltage detector feeding comparator input to trigger POR logic. Use Value: Guarantees reliable reset assertion down to 2.8 V VDD with <10 µs response time and no external passive tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BLT1 | 4.3 V, ±5%, 225 mW, but 100 Ω ZZT at 20 mA vs. 90 Ω at 5 mA for BZX84C4V3LT1 | Higher Zener impedance at low current reduces regulation accuracy in micro-power circuits | Select when operating near 20 mA and requiring ON Semiconductor's MMBZ52xx family footprint consistency |
| BZX84C4V3LT3G | Identical electrical specs and SOT-23 package, but supplied in 10,000-unit tape-and-reel (vs. 3,000 for LT1) | No functional difference; only logistics and volume procurement distinction | Choose for high-volume production runs where reel size and cost-per-unit optimization are critical |
Compared with MMBZ5227BLT1, BZX84C4V3LT1 delivers tighter low-current regulation; compared with BZX84C4V3LT3G, it offers identical performance in smaller reels suitable for prototyping and low-MOQ builds.
Availability
BZX84C4V3LT1 is available at Aetrix Electronics and suitable for portable power monitoring, USB interface protection, low-power sensor biasing, microcontroller reset circuits, and ESD-sensitive consumer electronics requiring stable component supply and RoHS-compliant sourcing.
Supply support for BZX84C4V3LT1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The BZX84C4V3LT1 belongs to the BZX84CxxxLT1 series of standard-tolerance Zener diodes designed specifically for compact, high-density voltage regulation in battery-powered and portable electronics.
FAQ
What is the Zener voltage tolerance for BZX84C4V3LT1?
The BZX84C4V3LT1 has a nominal Zener voltage of 4.3 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 4.0 V and 4.6 V when tested at 5 mA (IZT). This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet, under the BZX84CxxxLT1 SERIES section.
Does BZX84C4V3LT1 have a connection on pin 2?
No, pin 2 of the BZX84C4V3LT1 is internally unconnected (NC), as explicitly stated in the Pinout: 1-Anode, 2-No Connection, 3-Cathode note on pages 2 and 3 of the datasheet. It must remain electrically floating in PCB layout and cannot be used for grounding, thermal relief, or signal routing.
What is the maximum reverse leakage current for BZX84C4V3LT1 at 1 V?
The maximum reverse leakage current for BZX84C4V3LT1 is 3 µA at VR = 1 V, per the Electrical Characteristics table on page 3. This value is measured at TA = 25°C and applies to all units in the BZX84CxxxLT1 series with the same marking code (W9).
Is BZX84C4V3LT1 RoHS-compliant and lead-free?
Yes, the "G" suffix in the full ordering part number BZX84C4V3LT1G (as referenced in the Ordering Information table on page 2) confirms Pb-free packaging. The device complies with RoHS Directive 2011/65/EU and is manufactured using lead-free solderable finishes per JEDEC J-STD-020.
What is the thermal resistance (RJA) of BZX84C4V3LT1 on FR-5 board?
The thermal resistance from junction to ambient (RJA) for BZX84C4V3LT1 is 556 °C/W when mounted on FR-5 board, as specified in the Maximum Ratings table on page 1. This value assumes standard 1.0 × 0.75 × 0.62 inch board dimensions and defines the temperature rise per milliwatt of dissipated power.
BZX84C4V3LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84CxxxLT1
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±7%
- Power - Max:
- 225 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BZX84C4V3LT1 FAQ
1.How can I place an order for BZX84C4V3LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C4V3LT1 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 BZX84C4V3LT1 reliable?
The price and inventory of BZX84C4V3LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C4V3LT1 is usually 5 days.
3.What payment methods are accepted for BZX84C4V3LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C4V3LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C4V3LT1?
BZX84C4V3LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C4V3LT1 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 BZX84C4V3LT1?
For technical support, including BZX84C4V3LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C4V3LT1 requirements.
6.How does Aetrix verify that BZX84C4V3LT1 is sourced from the original manufacturer or authorized distributors?
All BZX84C4V3LT1 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 BZX84C4V3LT1 meets industry standards.
7.What is the process for return or replacement of BZX84C4V3LT1?
All BZX84C4V3LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C4V3LT1, 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 BZX84C4V3LT1 part is unused and in its original packaging.
Return procedure for BZX84C4V3LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C4V3LT1 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
