My Inquiry
My Account
Nexperia USA Inc. BZX384-B43,115
- Part No.:
- BZX384-B43,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B43,115.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,985
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX384-B43,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 43 V nominal breakdown voltage at 2 mA test current, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves as a precision reference or overvoltage clamp in low-power analog supply rails, sensor biasing circuits, and microcontroller I/O protection.
For engineers reviewing the BZX384-B43,115 datasheet, BZX384-B43,115 pinout, BZX384-B43,115 application, or BZX384-B43,115 equivalent, key selection criteria include its 43 V Zener voltage tolerance, thermal resistance (Rth(j-a) = 415 K/W), differential resistance (≤375 Ω), temperature coefficient (+0.05 mV/K), and SOD323 footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across load variations and temperature shifts. Its 43 V nominal Zener voltage is specified at IZ = 2 mA, with differential resistance ≤375 Ω ensuring minimal voltage drift under dynamic current conditions.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it delivers 300 mW steady-state dissipation and withstands 40 W non-repetitive surges (tp = 100 μs). The cathode-anode polarity is marked by a bar on the SOD323 body, aligning with standard PCB silkscreen conventions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal at IZ = 2 mA; ±2 % tolerance ensures predictable clamping in 3.3 V/5 V system references. |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C; defines maximum continuous DC or low-duty-cycle pulsed operation on standard FR4 PCB. |
| Differential Resistance (rdif) | ≤375 Ω at IZ = 2 mA; limits output impedance and voltage variation under load current changes. |
| Temperature Coefficient (SZ) | +0.05 mV/K at IZ = 2 mA; enables stable regulation across -65 °C to +150 °C ambient range. |
| Reverse Current (IR) | ≤150 μA at VR = 40 V; guarantees low leakage in standby or high-impedance sensing nodes. |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA; supports bidirectional ESD protection when used with series resistor. |
| Junction Temperature (Tj) | 150 °C maximum; sets thermal derating limit for sustained operation in enclosed industrial enclosures. |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package: 2-terminal, 1.35 mm × 0.85 mm body, 0.45 mm pitch, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; accepts reverse-bias current during Zener conduction. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter supply margin control than ±5 % variants in feedback networks for LDOs or ADC references. |
| 300 mW power rating | Supports direct regulation of low-current analog blocks (e.g., op-amp bias, DAC reference) without external heatsinking. |
| SOD323 footprint | Reduces PCB area by >50 % vs. DO-35; compatible with automated pick-and-place and reflow soldering per IPC-7351B. |
| 40 W surge capability | Clamps transient overvoltages (e.g., EFT, IEC 61000-4-4) without failure in industrial I/O protection circuits. |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller I/O Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure transmitters operating from 24 V rails. IC Role / Device Role / Timing Role: Zener shunt regulator providing 43 V reference for op-amp gain-setting resistors and current-sense amplifier biasing. Use Value: Maintains <±0.86 V regulation window over temperature, preventing zero/span drift beyond ±0.5 % full-scale error. | Use Scenario: Protecting 3.3 V GPIO pins against accidental 12 V miswiring or inductive kickback in PLC digital input modules. IC Role / Device Role / Timing Role: Reverse-biased clamping diode limiting pin voltage to 43 V while diverting fault current to ground. Use Value: Absorbs 40 W transient energy (100 μs) without degradation, preserving MCU latch-up immunity per JEDEC JESD78. |
| Low-Power Analog Reference | DC-DC Converter Feedback Divider |
Use Scenario: Generating stable 43 V reference for high-voltage ADC front-ends in battery management systems monitoring 48 V stacks. IC Role / Device Role / Timing Role: Precision voltage source feeding resistive divider into ADC reference input with <10 ppm/°C drift. Use Value: Delivers 0.05 mV/K temperature coefficient, reducing reference error to <1.5 LSB over –40 °C to +85 °C. | Use Scenario: Setting output voltage of isolated flyback converter supplying auxiliary 15 V rail in telecom power supplies. IC Role / Device Role / Timing Role: Upper leg of feedback divider network connected to optocoupler input, defining regulation setpoint. Use Value: ±2 % tolerance allows ±0.3 V output accuracy at 15 V, meeting EN 62368-1 ripple and stability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C43,115 | ±5 % tolerance (vs. ±2 %); higher max differential resistance (≤450 Ω) | Acceptable where cost sensitivity outweighs voltage accuracy (e.g., non-critical power-good detection) | Select for cost-driven consumer designs where 43 ±2.15 V suffices. |
| MMSZ43ET1G | Same 43 V nominal, ±5 % tolerance; SOD-123 package (larger footprint, 2.2 mm × 1.35 mm) | Requires PCB layout revision; higher thermal resistance (Rth(j-a) ≈ 500 K/W) limits power handling | Choose only if legacy SOD-123 footprint must be retained or procurement favors ON Semiconductor stock. |
Compared with BZX384-C43,115 and MMSZ43ET1G, the BZX384-B43,115 offers superior voltage accuracy and smaller footprint-critical for space-constrained industrial sensors and high-density power management ICs-while maintaining identical surge robustness and thermal performance on FR4 boards.
Availability
BZX384-B43,115 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, microcontroller I/O protection, low-power analog reference, and DC-DC converter feedback divider applications requiring stable component supply and long-term obsolescence management.
Supply support for BZX384-B43,115 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 essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX384 series belongs to Nexperia's precision Zener regulator portfolio, engineered specifically for compact, low-power voltage reference and overvoltage protection in space-constrained industrial and IoT edge devices.
FAQ
What is the maximum continuous reverse current this diode can handle at 43 V?
The BZX384-B43,115 is not rated for continuous reverse current at 43 V-it operates in Zener breakdown mode with controlled current (typically 1–5 mA) set by an external series resistor. At 43 V, sustained reverse current must remain below the 300 mW power limit, yielding a practical max of ~7 mA (43 V × 7 mA = 301 mW), assuming no ambient heating.
Can this Zener diode be used in parallel for higher power dissipation?
No-parallel connection is not recommended due to mismatched Zener voltages and thermal runaway risk. Each diode's VZ tolerance (±2 %) and positive temperature coefficient cause current hogging in one device, leading to premature failure. Use a single higher-power Zener or active regulation instead.
Is the SOD323 package compatible with standard reflow profiles for lead-free soldering?
Yes-the SOD323 package is qualified for IPC/JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature up to 260 °C. Nexperia specifies a maximum 20-second exposure above 220 °C, matching standard Class 3 assembly profiles used in industrial control PCB manufacturing.
How does the +0.05 mV/K temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
Over that 165 °C range, the coefficient contributes ±8.25 mV (0.05 mV/K × 165 K) drift to the 43 V nominal value-a ±0.019 % change. Combined with ±2 % initial tolerance, total worst-case deviation remains within ±2.02 %, well within typical analog supply tolerance budgets.
BZX384-B43,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-B43,115 FAQ
1.How can I place an order for BZX384-B43,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B43,115 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 BZX384-B43,115 reliable?
The price and inventory of BZX384-B43,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-B43,115 is usually 5 days.
3.What payment methods are accepted for BZX384-B43,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B43,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B43,115?
BZX384-B43,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B43,115 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 BZX384-B43,115?
For technical support, including BZX384-B43,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B43,115 requirements.
6.How does Aetrix verify that BZX384-B43,115 is sourced from the original manufacturer or authorized distributors?
All BZX384-B43,115 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 BZX384-B43,115 meets industry standards.
7.What is the process for return or replacement of BZX384-B43,115?
All BZX384-B43,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B43,115, 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 BZX384-B43,115 part is unused and in its original packaging.
Return procedure for BZX384-B43,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B43,115 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…
