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NXP Semiconductors BZX84-B4V3/LF1R
- Part No.:
- BZX84-B4V3/LF1R
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-B4V3/LF1R.pdf
- Description:
- DIODE ZENER 4.3V 250MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:8,706
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Product details
Overview
BZX84-B4V3/LF1R from NXP Semiconductors is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 4.3 V nominal breakdown voltage at 5 mA, 250 mW total power dissipation, and AEC-Q101 qualified for automotive use. It provides stable reference voltage in low-power supply regulation and overvoltage protection circuits.
For engineers reviewing the BZX84-B4V3/LF1R datasheet, BZX84-B4V3/LF1R pinout, BZX84-B4V3/LF1R application, or BZX84-B4V3/LF1R equivalent, this page delivers verified electrical parameters, thermal limits, SOT23 terminal mapping, automotive qualification status, and real-world design context for voltage reference and clamping functions.
Technical Context
This discrete Zener diode operates in reverse-bias breakdown mode to maintain a stable 4.3 V reference across its cathode-anode terminals under controlled current conditions. Its ±2 % tolerance (B-series), 250 mW power rating at 25 °C ambient, and non-repetitive peak reverse power dissipation of 40 W support transient suppression and precision biasing in space-constrained PCB layouts.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it features a differential resistance of 410 Ω (typ.) at 5 mA, reverse current ≤3 µA at 3.0 V, and temperature coefficient of −2.5 mV/K - enabling predictable drift compensation in temperature-sensitive analog subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 4.21 V to 4.39 V at IZ = 5 mA - defines usable regulation window for 4.3 V reference designs |
| Tolerance | ±2 % - tighter than C-series (±5 %), looser than A-series (±1 %); balances cost and accuracy |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 board |
| Differential Resistance (rdif) | 410 Ω (typ.) at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | ≤3 µA at VR = 3.0 V - ensures minimal leakage below knee voltage in standby circuits |
| Non-repetitive Peak Reverse Power | 40 W (tp ≤ 100 µs) - supports ESD/TVS-like transient clamping without device failure |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SOT23 (TO-236AB), plastic surface-mounted, 3-lead, 2.8 mm × 1.4 mm footprint per Figure 8; compatible with standard reflow and wave soldering profiles (Figures 9–10).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in regulation path |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection; must remain unconnected on PCB |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node and load return path |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT package | SOT23 footprint enables high-density routing and automated assembly in compact consumer and automotive modules |
| Automotive qualification | AEC-Q101 compliance ensures suitability for engine control units, body electronics, and ADAS sensor interfaces |
| Precision voltage reference | ±2 % tolerance at 4.3 V supports stable biasing in analog front-ends and ADC reference dividers |
| Transient energy handling | 40 W non-repetitive peak reverse power allows short-duration surge suppression without derating |
| Thermal robustness | Junction-to-ambient thermal resistance of 500 K/W (free air) supports operation up to +150 °C ambient |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Regulating 5 V rail for microcontroller I/O and CAN transceiver bias in door module PCBs. IC Role / Device Role / Timing Role: Zener shunt regulator providing stable 4.3 V reference for level-shifting and internal LDO feedback. Use Value: Maintains <3 µA leakage at 3.0 V, minimizing quiescent current in always-on vehicle networks. |
Use Scenario: Clamping amplifier input to prevent overvoltage damage from field wiring transients. IC Role / Device Role / Timing Role: Reverse-biased voltage clamp limiting signal swing to ±4.3 V before op-amp input stage. Use Value: 40 W peak power handling absorbs 100 µs surges without degradation, preserving signal integrity. |
| Consumer Power Adapter Feedback | Medical Portable Device Reference |
|
Use Scenario: Providing secondary-side voltage feedback to optocoupler in isolated AC/DC flyback converters. IC Role / Device Role / Timing Role: Precision 4.3 V reference setting regulation threshold for TL431-like feedback loop. Use Value: ±2 % tolerance ensures consistent output voltage across production batches without trimming. |
Use Scenario: Generating stable bias for low-noise instrumentation amplifiers in battery-powered ECG monitors. IC Role / Device Role / Timing Role: Low-drift Zener reference compensating for temperature-induced offset in analog front-end. Use Value: −2.5 mV/K temperature coefficient enables predictable drift correction in clinical-grade measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage regulator diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | ±5 % tolerance (vs. ±2 %), higher max reverse current (5 µA at 3.0 V) | Acceptable where cost priority outweighs regulation accuracy; less suitable for precision feedback | Select when budget constraints dominate and 4.3 V ±0.215 V window suffices |
| MMSZ4V3T1G | Same 4.3 V nominal, ±5 % tolerance, 500 mW Ptot, SOD-123 package | Larger footprint and higher power rating; not drop-in compatible with SOT23 layout | Choose only if higher power margin or alternate package compatibility is required |
Compared with BZX84-C4V3 and MMSZ4V3T1G, the BZX84-B4V3/LF1R offers tighter tolerance than both alternatives while maintaining identical SOT23 footprint and AEC-Q101 qualification - making it optimal for automotive and industrial designs requiring regulated 4.3 V references with minimal board area.
Availability
BZX84-B4V3/LF1R is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical portable device designs requiring stable component supply with AEC-Q101 assurance.
Supply support for BZX84-B4V3/LF1R 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The BZX84 series belongs to NXP's discrete voltage regulator portfolio, engineered for reliable, low-cost voltage reference and clamping in space-constrained, high-reliability systems.
FAQ
What is the exact breakdown voltage range for BZX84-B4V3/LF1R?
The BZX84-B4V3/LF1R has a guaranteed breakdown voltage range of 4.21 V to 4.39 V at test current IZ = 5 mA, corresponding to its ±2 % tolerance specification around the nominal 4.3 V value. This range is confirmed in Table 8 of the NXP datasheet Rev. 6 and applies strictly under specified thermal and current conditions.
Is BZX84-B4V3/LF1R suitable for automotive applications?
Yes, BZX84-B4V3/LF1R is AEC-Q101 qualified per Section 8.1 of the NXP datasheet, having passed stress tests for temperature cycling, high-temperature reverse bias, and ESD. It is explicitly approved for use in automotive electronic control units, body modules, and infotainment systems.
What is the maximum forward voltage of BZX84-B4V3/LF1R?
The maximum forward voltage (VF) of BZX84-B4V3/LF1R is 0.9 V at forward current IF = 10 mA, as specified in Table 1 (Quick reference data) and Table 7 (Characteristics) of the NXP datasheet. This value reflects typical conduction behavior when used in forward-bias protection configurations.
Does BZX84-B4V3/LF1R have a connected pin 2?
No, pin 2 of BZX84-B4V3/LF1R is marked "n.c." (not connected) in Table 2 (Pinning) of the datasheet. It is an internal lead frame tab with no electrical function and must remain unconnected on the PCB layout to avoid unintended parasitic coupling or thermal effects.
What is the thermal resistance from junction to ambient for BZX84-B4V3/LF1R?
The thermal resistance from junction to ambient (Rth(j-a)) for BZX84-B4V3/LF1R is 500 K/W in free air, as stated in Table 6 (Thermal characteristics). This value assumes mounting on FR4 PCB with single-sided copper and standard footprint per datasheet condition [1].
BZX84-B4V3/LF1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±2%
- 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
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23 (TO-236AB)
BZX84-B4V3/LF1R FAQ
1.How can I place an order for BZX84-B4V3/LF1R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-B4V3/LF1R 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-B4V3/LF1R reliable?
The price and inventory of BZX84-B4V3/LF1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B4V3/LF1R is usually 5 days.
3.What payment methods are accepted for BZX84-B4V3/LF1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B4V3/LF1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-B4V3/LF1R?
BZX84-B4V3/LF1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-B4V3/LF1R 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-B4V3/LF1R?
For technical support, including BZX84-B4V3/LF1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B4V3/LF1R requirements.
6.How does Aetrix verify that BZX84-B4V3/LF1R is sourced from the original manufacturer or authorized distributors?
All BZX84-B4V3/LF1R 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-B4V3/LF1R meets industry standards.
7.What is the process for return or replacement of BZX84-B4V3/LF1R?
All BZX84-B4V3/LF1R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B4V3/LF1R, 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-B4V3/LF1R part is unused and in its original packaging.
Return procedure for BZX84-B4V3/LF1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-B4V3/LF1R Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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