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Nexperia USA Inc. BZX79-B43,133
- Part No.:
- BZX79-B43,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B43,133.pdf
- Description:
- DIODE ZENER 43V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:140,000
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Product details
Overview
BZX79-B43,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal working voltage 43 V at 2 mA test current, 85 Ω typical differential resistance, and −3.5 mV/K to +46.6 mV/K temperature coefficient. It operates as a low-power voltage reference in biasing, regulation, and overvoltage protection circuits, rated for 500 mW total power dissipation at 50 °C ambient and packaged in hermetically sealed SOD27 (DO-35) glass.
For engineers reviewing the BZX79-B43,133 datasheet, BZX79-B43,133 pinout, BZX79-B43,133 application, or BZX79-B43,133 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance, temperature coefficient behavior across operating current, reverse leakage at specified VR, and thermal resistance from junction to ambient under standard PCB mounting conditions.
Technical Context
This device functions as a two-terminal silicon Zener diode operating in reverse breakdown, delivering stable reference voltage via controlled avalanche and Zener mechanisms depending on nominal voltage. At 43 V, it operates primarily in avalanche mode, exhibiting positive temperature coefficient above ~5 V and low dynamic impedance critical for noise-sensitive references.
Its thermal design relies on axial-leaded SOD27 package with Rth j-a = 380 K/W (lead length max.) and Rth j-tp = 300 K/W (8 mm lead), requiring careful PCB layout for power handling. Non-repetitive peak reverse power dissipation reaches 40 W for 100 μs pulses, enabling transient suppression in conjunction with series limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 42.1 V to 43.9 V at IZ = 2 mA - defines tight ±2% regulation window for precision reference use |
| Differential Resistance rdif | 85 Ω typical at IZ = 2 mA - determines output impedance and load regulation error under varying current |
| Temperature Coefficient SZ | +31.4 mV/K to +46.6 mV/K at IZ = 2 mA - quantifies voltage drift per degree Celsius, critical for temperature-stable designs |
| Reverse Current IR | 50 nA max at VR = 0.7 × VZnom = 30.1 V - specifies leakage level affecting high-impedance bias networks |
| Total Power Dissipation Ptot | 500 mW at Tamb = 50 °C - sets maximum continuous DC power handling on standard PCB without heatsink |
| Non-repetitive Peak Power PZSM | 40 W for tp = 100 μs - enables short-duration surge clamping when used with appropriate series impedance |
| Junction-to-Ambient Rth j-a | 380 K/W - defines thermal bottleneck for steady-state power derating above 50 °C ambient |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking; leads are tinned copper alloy, body diameter 1.85 mm, length 4.25 mm, lead spacing 25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in reverse-biased operation | Connected to circuit ground or lower potential node when used as shunt regulator |
| Cathode | Reverse breakdown terminal / regulated output node | Marked by colored band; connects to input supply through current-limiting resistor and delivers stable 43 V reference |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct replacement in precision reference designs without recalibration or trimming |
| Low differential resistance (85 Ω typ.) | Minimizes output voltage variation under ±1 mA load current changes, improving regulation accuracy |
| Avalanche-mode operation at 43 V | Provides positive, predictable temperature coefficient suitable for compensated reference circuits |
| Hermetic glass SOD27 package | Ensures long-term stability and reliability in humid or corrosive environments vs. plastic-packaged alternatives |
| 40 W non-repetitive peak power rating | Supports transient overvoltage suppression in low-energy signal-line protection applications |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 43 V reference for feedback loop of isolated DC-DC converter secondary-side error amplifier. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise regulation threshold independent of primary-side control timing. Use Value: Tight ±2% tolerance and low 85 Ω dynamic impedance maintain <±0.5% output voltage accuracy across line and load variations. |
Use Scenario: Protecting microcontroller ADC input from accidental 48 V bus exposure in industrial sensor interface. IC Role / Device Role / Timing Role: Passive clamping element diverting excess current during fault events; no timing function. Use Value: 40 W peak power rating allows safe absorption of 100 μs transients up to 400 V without degradation when paired with 1 kΩ series resistor. |
| Current Source Bias | Temperature-Compensated Reference |
|
Use Scenario: Setting bias current for high-gain transistor amplifier stage requiring stable quiescent point. IC Role / Device Role / Timing Role: Two-terminal active load defining constant current via Ohm's law with series resistor. Use Value: Low 50 nA leakage at 30.1 V ensures minimal error in sub-10 μA bias currents, preserving amplifier linearity. |
Use Scenario: Paired with complementary negative-coefficient Zener (e.g., BZX79-B5V1) to build zero-drift 48 V reference. IC Role / Device Role / Timing Role: Positive-TC component in series/parallel compensation network; no timing role. Use Value: +31.4 to +46.6 mV/K coefficient enables cancellation of −2.7 mV/K drift from 5.1 V Zener, achieving <±10 ppm/°C net drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 43 V ±5%, 75 Ω rdif, DO-41 package, 1 W Ptot | Higher power rating but looser tolerance; larger footprint | Select when higher continuous power or legacy DO-41 compatibility is required |
| BZX84-C43 | 43 V ±5%, 150 Ω rdif, SOT-23 surface-mount, 300 mW Ptot | Smaller size but higher impedance and lower power; not hermetic | Select for space-constrained PCBs where ±5% tolerance is acceptable |
Compared with 1N4749A and BZX84-C43, BZX79-B43,133 offers tighter ±2% tolerance and hermetic glass reliability at the cost of lower power rating and through-hole mounting-making it optimal for precision analog references where long-term stability outweighs size or wattage needs.
Availability
BZX79-B43,133 is available at Aetrix Electronics and suitable for industrial sensor conditioning, medical instrument voltage references, and telecom power supervision requiring stable component supply with traceable manufacturing history and long-lifecycle support.
Supply support for BZX79-B43,133 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-reliability diodes, MOSFETs, and logic devices for automotive and industrial markets.
This device belongs to the BZX79 series of low-power Zener diodes designed specifically for precision voltage referencing and stabilization in cost-sensitive, high-volume applications where hermetic integrity and tight tolerance are essential.
FAQ
What is the maximum continuous reverse current this diode can handle at 43 V?
The BZX79-B43,133 does not specify a maximum continuous reverse current rating; instead, its safe operating limit is defined by power dissipation. At 43 V, the maximum continuous Zener current is approximately 11.6 mA (500 mW ÷ 43 V), assuming 50 °C ambient and standard PCB mounting per datasheet note 2.
Can this Zener diode be used in parallel for higher power handling?
No-Zener diodes exhibit manufacturing spread in breakdown voltage, causing current hogging when paralleled. Even within the same ±2% bin, mismatched dynamic impedance leads to unequal current sharing and thermal runaway. Use a single higher-power device or external active current balancing if greater than 500 mW is needed.
Is the SOD27 package RoHS compliant and lead-free?
Yes-Nexperia confirms the BZX79-B43,133 meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations. The SOD27 glass package contains no restricted substances above threshold limits, and the device carries Nexperia's standard "LF" (lead-free) marking per packaging specification.
How does temperature affect regulation accuracy at 43 V?
At 43 V, the BZX79-B43,133 exhibits a positive temperature coefficient ranging from +31.4 mV/K to +46.6 mW/K. This means its Zener voltage increases by ~35–47 mV per °C rise in junction temperature, translating to ~0.08–0.11 %/°C drift-critical to account in high-precision or wide-temperature-range applications.
BZX79-B43,133 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- 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-B43,133 FAQ
1.How can I place an order for BZX79-B43,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B43,133 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-B43,133 reliable?
The price and inventory of BZX79-B43,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B43,133 is usually 5 days.
3.What payment methods are accepted for BZX79-B43,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B43,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B43,133?
BZX79-B43,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B43,133 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-B43,133?
For technical support, including BZX79-B43,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B43,133 requirements.
6.How does Aetrix verify that BZX79-B43,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-B43,133 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-B43,133 meets industry standards.
7.What is the process for return or replacement of BZX79-B43,133?
All BZX79-B43,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B43,133, 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-B43,133 part is unused and in its original packaging.
Return procedure for BZX79-B43,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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