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Nexperia USA Inc. BZX84J-B43/DG/B4X
- Part No.:
- BZX84J-B43/DG/B4X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
BZX84J-B43/DG/B4X.pdf
- Description:
- DIODE ZENER 43V 550MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:2,050
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Product details
Overview
BZX84J-B43/DG/B4X from Nexperia is a 43 V ±2 % tolerance Zener diode in SOD323F (SC-90) package, rated for 550 mW total power dissipation and AEC-Q101 qualified for automotive use. It provides precise voltage regulation with 56 Ω differential resistance at IZ = 2 mA, 0.05 µA reverse current at VR = 34.4 V, and operates across –55 °C to +150 °C ambient temperature. It serves as a stable reference or overvoltage clamp in automotive body control modules.
For engineers reviewing the BZX84J-B43/DG/B4X datasheet, BZX84J-B43/DG/B4X pinout, BZX84J-B43/DG/B4X application, or BZX84J-B43/DG/B4X equivalent, this page delivers verified electrical parameters, thermal behavior, automotive qualification status, and real-world implementation guidance - all grounded in Nexperia's Rev. 3 (2025) product data sheet.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 43 V reference under regulated current conditions. Its low 56 Ω differential resistance ensures minimal voltage deviation across load variations, while its negative temperature coefficient of +5.6 mV/K at IZ = 2 mA enables predictable thermal drift compensation in precision circuits.
Designed for surface-mount reliability, it supports non-repetitive peak reverse power dissipation up to 40 W (tp = 100 µs, square wave), and exhibits 56 pF junction capacitance at 1 MHz and 0 V bias - making it suitable for both DC regulation and moderate-speed transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V ±2 % at IZ = 2 mA - tight tolerance enables accurate voltage reference without trimming |
| Differential Resistance | 56 Ω at IZ = 2 mA - low impedance stabilizes output against current fluctuations |
| Total Power Dissipation | 550 mW at Tamb ≤ 25 °C - defines maximum continuous DC power handling on FR4 PCB |
| Reverse Current | 0.05 µA at VR = 34.4 V - ensures minimal leakage below knee voltage |
| Junction Capacitance | 56 pF at f = 1 MHz, VR = 0 V - limits high-frequency noise coupling in signal-path references |
| Thermal Resistance | 230 K/W (junction-to-ambient) - determines steady-state temperature rise under load |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
The BZX84J-B43/DG/B4X is housed in a SOD323F (SC-90) plastic surface-mount package: 2.3 mm × 1.35 mm footprint, 0.65 mm height, cathode marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; carries reverse current during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| ±2 % voltage tolerance | Reduces need for external calibration in 43 V reference designs such as battery monitoring IC biasing |
| Low differential resistance (56 Ω) | Maintains regulation stability across ±1 mA current variation - critical for low-noise analog supplies |
| SOD323F ultra-small package | 0.65 mm profile enables dense PCB layouts in space-constrained automotive ECUs |
| Non-repetitive surge capability | Withstands 40 W pulses (100 µs, square wave) - protects downstream circuitry from ESD or load-dump transients |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 43 V supply for LIN transceiver biasing and microcontroller I/O protection in BCMs. IC Role / Device Role / Timing Role: Zener reference and overvoltage clamp protecting 5 V LDO inputs from battery line transients. Use Value: AEC-Q101 qualification and 40 W surge rating ensure robustness against ISO 7637-2 pulse 5a load dump events. |
Use Scenario: Providing stable 43 V reference for 16-bit ADC front-end in industrial pressure transmitters. IC Role / Device Role / Timing Role: Precision voltage reference establishing full-scale input range for ratiometric sensor excitation. Use Value: ±2 % tolerance and 56 Ω rdiff limit reference error to <0.1 % FS across operating current range. |
| Automotive Infotainment Power Sequencing | Telecom Line Interface Protection |
Use Scenario: Clamping 43 V auxiliary rail in infotainment head unit power tree during cold-crank conditions. IC Role / Device Role / Timing Role: Overvoltage protector for PMIC enable inputs and EEPROM write circuitry. Use Value: 0.05 µA leakage at 34.4 V prevents false triggering of enable logic during undervoltage states. |
Use Scenario: Protecting RS-485 receiver inputs from induced surges on long-haul telecom lines. IC Role / Device Role / Timing Role: Secondary clamp stage after primary TVS, absorbing residual energy above 43 V threshold. Use Value: 56 pF capacitance avoids signal integrity degradation on 10 Mbps differential buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C43 | ±5 % tolerance, higher rdiff (80 Ω), same SOD323F package | Acceptable where 43 V ±5 % suffices (e.g., non-critical bias rails) | Select when cost sensitivity outweighs precision requirements; not AEC-Q101 qualified |
| MMSZ43ET1G | ±5 % tolerance, 500 mW Ptot, SOD-123 package (larger footprint) | Requires PCB layout revision due to different pad geometry and thermal profile | Choose only if legacy SOD-123 design reuse is mandatory; lacks automotive qualification |
Compared with BZX84J-B43/DG/B4X, the BZX84-C43 offers lower cost but sacrifices tolerance and automotive compliance, while MMSZ43ET1G trades package compatibility and qualification for broader distributor availability - neither matches the combined precision, ruggedness, and form factor of the Nexperia AEC-Q101 part.
Availability
BZX84J-B43/DG/B4X is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX84J-B43/DG/B4X 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, with leadership in automotive-qualified components and advanced packaging.
The BZX84J series belongs to Nexperia's automotive-grade Zener diode portfolio, engineered specifically for precision voltage reference and transient protection in harsh-environment electronic control units.
FAQ
What is the maximum continuous forward current for BZX84J-B43/DG/B4X?
The absolute maximum forward current is 250 mA per Table 5 (Limiting Values). However, sustained forward conduction is not typical in Zener regulator applications; the device is intended for reverse-bias operation. Forward voltage is specified at 100 mA (1.1 V max), confirming safe pulsed handling but not continuous DC use.
Does BZX84J-B43/DG/B4X require derating above 25 °C ambient?
Yes - total power dissipation must be linearly derated above 25 °C at 4.4 mW/°C, based on its 230 K/W junction-to-ambient thermal resistance. At 85 °C ambient, maximum allowable Ptot drops to approximately 320 mW to maintain Tj ≤ 150 °C.
How is the 43 V Zener voltage measured and guaranteed?
VZ is measured at IZ = 2 mA with Tj = 25 °C, per Table 9. The "B" suffix denotes ±2 % tolerance, meaning actual VZ falls between 42.14 V and 43.86 V under those test conditions - verified during 100 % production testing per Nexperia's quality protocol.
Can BZX84J-B43/DG/B4X replace older BZX84 variants in existing designs?
Yes - it shares identical SOD323F footprint, pinout, and basic electrical ratings with legacy BZX84 parts. Key upgrades include AEC-Q101 qualification and improved PZSM performance. No layout change is needed, but verify thermal margin given its 550 mW rating versus older 350 mW versions.
BZX84J-B43/DG/B4X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 550 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
BZX84J-B43/DG/B4X FAQ
1.How can I place an order for BZX84J-B43/DG/B4X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84J-B43/DG/B4X 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 BZX84J-B43/DG/B4X reliable?
The price and inventory of BZX84J-B43/DG/B4X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84J-B43/DG/B4X is usually 5 days.
3.What payment methods are accepted for BZX84J-B43/DG/B4X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84J-B43/DG/B4X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84J-B43/DG/B4X?
BZX84J-B43/DG/B4X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84J-B43/DG/B4X 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 BZX84J-B43/DG/B4X?
For technical support, including BZX84J-B43/DG/B4X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84J-B43/DG/B4X requirements.
6.How does Aetrix verify that BZX84J-B43/DG/B4X is sourced from the original manufacturer or authorized distributors?
All BZX84J-B43/DG/B4X 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 BZX84J-B43/DG/B4X meets industry standards.
7.What is the process for return or replacement of BZX84J-B43/DG/B4X?
All BZX84J-B43/DG/B4X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84J-B43/DG/B4X, 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 BZX84J-B43/DG/B4X part is unused and in its original packaging.
Return procedure for BZX84J-B43/DG/B4X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84J-B43/DG/B4X Tags
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MMBZ5240B-7-F
Diodes Incorporated
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