My Inquiry
My Account
Nexperia USA Inc. BZX84W-B43F
- Part No.:
- BZX84W-B43F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B43F.pdf
- Description:
- DIODE ZENER 43V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:10
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-B43F from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 43 V nominal Zener voltage at 5 mA, with 375 Ω typical differential resistance and 41.2 mV/K temperature coefficient. It delivers stable reference voltage in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.
For engineers reviewing the BZX84W-B43F datasheet, BZX84W-B43F pinout, BZX84W-B43F application, or BZX84W-B43F equivalent, this page provides verified Zener voltage, thermal resistance, reverse current limits, and SOT323 terminal mapping to support precision regulation design and component selection.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified 43 V nominal working voltage at IZ = 5 mA, exhibiting a positive temperature coefficient of +41.2 mV/K - indicating increasing Zener voltage with junction temperature rise. Its differential resistance of 375 Ω at 5 mA defines regulation stiffness under load variation.
The device is optimized for surface-mount use on FR4 PCBs with single-sided copper, achieving 455 K/W junction-to-ambient thermal resistance. It supports non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses, enabling transient suppression capability beyond steady-state regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 43 V nominal at IZ = 5 mA; tight ±2% tolerance ensures precise voltage reference in feedback networks. |
| Differential Resistance rdif | 375 Ω max at IZ = 5 mA; determines output impedance and regulation error under current variation. |
| Temperature Coefficient SZ | +41.2 mV/K at IZ = 2 mA; quantifies Zener voltage drift per degree Celsius rise in junction temperature. |
| Reverse Current IR | 50 nA max at VR = 0.7 × VZnom; confirms low leakage below breakdown, critical for standby power integrity. |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on standard FR4; sets maximum continuous DC power handling in ambient conditions. |
| Forward Voltage VF | 0.9 V max at IF = 10 mA; defines conduction loss when used in forward-biased clamping or polarity protection. |
| Junction Temperature Tj | 150 °C max; constrains thermal design margin for reliability in enclosed or high-ambient environments. |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, footprint compliant with JEDEC MO-203AA and IEC 60134 standards. Dimensions: 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), 0.65 mm pitch.
| 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 solder joint required. |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables high-accuracy voltage references without post-calibration in 5–10 mA bias applications. |
| Low 375 Ω differential resistance | Minimizes output voltage deviation under ±1 mA load current shifts in feedback divider networks. |
| Positive +41.2 mV/K tempco | Allows predictable compensation when paired with negative-tempco components (e.g., BJTs) in temperature-stable references. |
| 275 mW power rating on FR4 | Supports direct integration into compact 3.3 V/5 V/12 V rail monitors without external heatsinking. |
| Non-repetitive 40 W surge capability | Provides transient overvoltage clamping for ESD or inductive kick events in sensor interface lines. |
Applications
| Power Supply Feedback Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-boost converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Zener diode establishes precise 43 V reference at optocoupler LED cathode, defining secondary-side regulation threshold. Use Value: ±2% tolerance and 375 Ω rdif ensure <±1.5% output voltage accuracy across line/load/temperature variations. |
Use Scenario: Protecting microcontroller GPIO pins from 48 V industrial bus transients. IC Role / Device Role / Timing Role: Reverse-biased BZX84W-B43F clamps induced surges above 43 V to safe levels before reaching sensitive inputs. Use Value: 40 W non-repetitive pulse rating absorbs 100 µs transients without degradation, preserving long-term reliability. |
| Low-Power Voltage Monitor | Temperature-Compensated Reference |
Use Scenario: Detecting undervoltage lockout (UVLO) in battery-powered instrumentation with 36–48 V nominal input. IC Role / Device Role / Timing Role: Forms threshold detector with comparator by generating stable 43 V reference against scaled-down input voltage. Use Value: 50 nA reverse leakage at 30.1 V ensures negligible current draw in always-on monitoring circuits. |
Use Scenario: Building a 43 V reference with reduced thermal drift in precision analog front-ends. IC Role / Device Role / Timing Role: Paired with NPN transistor base-emitter junction (−2 mV/K) to offset +41.2 mV/K Zener tempco. Use Value: Enables composite reference stability better than ±50 ppm/°C over −40 °C to +85 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C43 | ±5% tolerance (vs. ±2%), same 43 V nominal, identical SOT323 package and thermal specs. | Acceptable where cost sensitivity outweighs regulation accuracy; less suitable for closed-loop feedback requiring tight setpoint control. | Select for cost-driven consumer electronics where ±5% output tolerance is acceptable. |
| MMSZ43ET1G | ±5% tolerance, 43 V nominal, SOD-123 package (larger footprint), 500 mW Ptot, 350 Ω rdif. | Higher power handling enables higher bias currents but requires larger PCB area; not drop-in compatible due to different land pattern. | Choose when >275 mW continuous dissipation is needed or existing SOD-123 layout prevents SOT323 adoption. |
Compared with BZX84W-C43, the BZX84W-B43F offers tighter voltage control essential for precision feedback; versus MMSZ43ET1G, it saves board space and reduces parasitic capacitance (0.6 pF vs. ~2 pF), improving high-frequency noise immunity in signal-path references.
Availability
BZX84W-B43F is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage protection clamp, and low-power voltage monitor applications requiring stable component supply, consistent parametric performance, and RoHS-compliant SMT packaging.
Supply support for BZX84W-B43F 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 logic, discrete, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, designed specifically for compact, high-frequency voltage regulation and protection in space-constrained SMT applications.
FAQ
What is the maximum continuous reverse current the BZX84W-B43F can sustain without degradation?
The device has no defined maximum continuous reverse current - its operation depends on power dissipation limits. At 43 V Zener voltage, sustained reverse current must be limited to ≤6.4 mA to stay within the 275 mW total power dissipation rating at 25 °C ambient on FR4 PCB. Derating applies above 25 °C per the 455 K/W thermal resistance.
Can BZX84W-B43F be used in forward conduction mode?
Yes - it functions as a standard silicon diode in forward bias, with VF ≤ 0.9 V at IF = 10 mA. This allows dual-use applications such as polarity protection or level-shifting, though its primary design intent and characterization are for reverse-bias Zener regulation.
How does the "B" suffix in BZX84W-B43F differ from "C" in BZX84W-C43?
The "B" denotes ±2% Zener voltage tolerance at 5 mA test current, while "C" indicates ±5% tolerance. Both share identical package, thermal characteristics, and pinout. The "B" grade is selected where tighter regulation accuracy is required, such as in feedback loops or precision references.
Is BZX84W-B43F suitable for automotive applications?
No - this part is explicitly marked as non-automotive qualified per Nexperia's revision history. It lacks AEC-Q101 qualification, automotive-grade screening, and extended temperature validation. For automotive use, Nexperia offers separate -Q qualified variants (e.g., BZX84W-B43-Q), which must be specified separately.
BZX84W-B43F 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):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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-B43F FAQ
1.How can I place an order for BZX84W-B43F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B43F 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-B43F reliable?
The price and inventory of BZX84W-B43F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B43F is usually 5 days.
3.What payment methods are accepted for BZX84W-B43F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B43F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B43F?
BZX84W-B43F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B43F 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-B43F?
For technical support, including BZX84W-B43F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B43F requirements.
6.How does Aetrix verify that BZX84W-B43F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B43F 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-B43F meets industry standards.
7.What is the process for return or replacement of BZX84W-B43F?
All BZX84W-B43F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B43F, 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-B43F part is unused and in its original packaging.
Return procedure for BZX84W-B43F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B43F 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…
