My Inquiry
My Account
Nexperia USA Inc. BZX79-B43,143
- Part No.:
- BZX79-B43,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B43,143.pdf
- Description:
- DIODE ZENER 43V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:4,990
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX79-B43,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal working voltage 43 V, 500 mW total power dissipation, and DO-35 (SOD27) hermetically sealed glass package. It operates as a low-power voltage reference in biasing, regulation, and overvoltage protection circuits for industrial power supplies and sensor signal conditioning.
For engineers reviewing the BZX79-B43,143 datasheet, BZX79-B43,143 pinout, BZX79-B43,143 application, or BZX79-B43,143 equivalent, key selection criteria include Zener voltage tolerance (±2%), differential resistance (85 Ω max at 2 mA), temperature coefficient (+45 mV/K typ), reverse current (50 nA max at 0.7×VZnom), and non-repetitive peak reverse power (40 W).
Technical Context
This device functions as a two-terminal silicon Zener diode operating in reverse breakdown to maintain stable DC voltage under varying load or input conditions. Its design centers on precise voltage regulation at IZtest = 2 mA, with thermal stability governed by a positive temperature coefficient of +45 mV/K (typical) above 6.2 V.
The BZX79-B43,143 uses axial-leaded SOD27 packaging with cathode band marking, optimized for through-hole mounting on PCBs without metallization pads. Junction-to-ambient thermal resistance is 380 K/W, limiting continuous operation to 400 mW at Tamb = 50 °C per IEC 60134 absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 42.1 V to 43.9 V at IZ = 2 mA - ensures tight regulation within ±2% tolerance for precision reference applications |
| Differential Resistance rdif | 85 Ω max at IZ = 2 mA - defines output impedance affecting load regulation error |
| Temperature Coefficient SZ | +45 mV/K typical at IZ = 2 mA - quantifies voltage drift with junction temperature rise |
| Reverse Current IR | 50 nA max at VR = 29.8 V (0.7×VZnom) - determines leakage-induced error in high-impedance bias networks |
| Non-repetitive Peak Power PZSM | 40 W at tp = 100 μs - supports transient overvoltage clamping without failure |
| Total Power Dissipation Ptot | 500 mW at Tamb = 50 °C - sets maximum steady-state power handling on standard PCB layout |
| Junction Temperature Range Tj | −65 °C to +200 °C - enables operation in extended industrial and automotive under-hood environments |
Pinout & Package
Hermetically sealed axial-leaded glass package per SOD27 (DO-35) outline: 2.54 mm lead spacing, 4.25 mm body length, 1.85 mm body diameter, cathode indicated by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in Zener configuration | Connected to lower potential node; carries forward current up to 250 mA during transient conduction |
| Cathode | Reverse breakdown terminal / regulated output node | Provides stable 43 V reference when reverse-biased; marked by black band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables accurate voltage references without post-calibration in analog front-ends and ADC biasing |
| 40 W non-repetitive peak reverse power | Permits robust ESD and surge suppression in 12 V/24 V industrial control I/O protection circuits |
| Low reverse leakage (50 nA) | Minimizes current draw in battery-powered sensor nodes where quiescent power is critical |
| SOD27 glass package with cathode band | Ensures reliable visual polarity identification and hermetic sealing against moisture ingress |
| 200 °C maximum junction temperature | Supports uninterrupted operation in high-temperature environments such as motor drive control modules |
Applications
| Industrial Power Supply Regulation | Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing reference voltage for op-amp comparators and linear regulators in 24 V PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode providing fixed 43 V reference for feedback divider networks and overvoltage detection thresholds. Use Value: Tight ±2% tolerance ensures consistent trip points across production batches without trimming. | Use Scenario: Biasing bridge sensors and RTDs in process instrumentation transmitters. IC Role / Device Role / Timing Role: Low-leakage voltage reference establishing excitation current source accuracy. Use Value: 50 nA max reverse current prevents measurement offset errors in microamp-level sensor interfaces. |
| Overvoltage Protection Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamping induced transients on 48 V CAN bus lines and industrial fieldbus interfaces. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 40 W surges for <100 μs duration. Use Value: 40 W non-repetitive rating allows single-event surge handling without degradation or replacement. | Use Scenario: Generating clean reset threshold for ARM Cortex-M microcontrollers in embedded gateways. IC Role / Device Role / Timing Role: Precision Zener defining brown-out detection level at 43 V for auxiliary supply monitoring. Use Value: +45 mV/K temperature coefficient enables predictable reset voltage shift across −40 °C to +85 °C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | Same 43 V nominal Zener voltage but ±5% tolerance and higher differential resistance (100 Ω max) | Limited to non-critical regulation where cost outweighs precision | Select when ±5% tolerance and lower cost are acceptable trade-offs for general-purpose clamping |
| BZX84-C43 | SOT-23 surface-mount package; same ±5% tolerance; lower power rating (300 mW) | Designed for space-constrained PCB layouts requiring automated assembly | Choose for compact designs where reflow compatibility and board area savings justify reduced power handling |
Compared with BZX79-B43,143, the 1N4749A offers lower precision and higher impedance, while the BZX84-C43 sacrifices power rating and through-hole reliability for miniaturization-making the BZX79-B43,143 optimal for high-stability, through-hole industrial references.
Availability
BZX79-B43,143 is available at Aetrix Electronics and suitable for industrial power supply regulation, sensor signal conditioning, overvoltage protection clamp, and microcontroller reset circuit applications requiring stable component supply and long-term obsolescence management.
Supply support for BZX79-B43,143 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 leader in discrete semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive, industrial, and computing markets.
The BZX79 series belongs to Nexperia's legacy Zener diode product line, engineered specifically for precision voltage reference and low-power stabilization in cost-sensitive, high-reliability industrial systems.
FAQ
What is the maximum continuous power dissipation for BZX79-B43,143 at 50 °C ambient?
The BZX79-B43,143 has a maximum continuous power dissipation of 500 mW at Tamb = 50 °C when mounted on a PCB without metallization pad and with lead length ≤8 mm. At higher ambient temperatures, derating applies per the thermal resistance Rth j-a = 380 K/W.
How is polarity identified on the BZX79-B43,143 package?
Polarity is marked by a black cathode band on the glass body of the SOD27 (DO-35) package. The lead adjacent to the band is the cathode; the opposite lead is the anode. This marking aligns with JEDEC DO-35 standards and is visible before and after PCB insertion.
Does BZX79-B43,143 support surge protection applications?
Yes-the device supports non-repetitive transient suppression with a rated 40 W peak reverse power at tp = 100 μs. This capability enables use in IEC 61000-4-5 surge protection stages for industrial interfaces, provided surge repetition rate remains low to avoid thermal accumulation.
What is the typical temperature coefficient for BZX79-B43,143 at 2 mA test current?
The typical temperature coefficient is +45 mV/K at IZ = 2 mA, reflecting the positive drift characteristic common to Zeners above 6.2 V. This value is confirmed in Figure 6 of the Nexperia datasheet and directly impacts voltage reference stability across operating temperature ranges.
BZX79-B43,143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 400 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:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ALF2
BZX79-B43,143 FAQ
1.How can I place an order for BZX79-B43,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B43,143 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 BZX79-B43,143 reliable?
The price and inventory of BZX79-B43,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B43,143 is usually 5 days.
3.What payment methods are accepted for BZX79-B43,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B43,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B43,143?
BZX79-B43,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B43,143 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 BZX79-B43,143?
For technical support, including BZX79-B43,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B43,143 requirements.
6.How does Aetrix verify that BZX79-B43,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-B43,143 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 BZX79-B43,143 meets industry standards.
7.What is the process for return or replacement of BZX79-B43,143?
All BZX79-B43,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B43,143, 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 BZX79-B43,143 part is unused and in its original packaging.
Return procedure for BZX79-B43,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-B43,143 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…
