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Nexperia USA Inc. BZX79-B24,133
- Part No.:
- BZX79-B24,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B24,133.pdf
- Description:
- DIODE ZENER 24V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:6,346
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Product details
Overview
BZX79-B24,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 24 V breakdown voltage at 5 mA test current, 60 Ω typical differential resistance, and −22 mV/K temperature coefficient. It delivers stable low-power voltage reference in space-constrained analog circuits, such as sensor biasing and power supply feedback networks.
For engineers reviewing the BZX79-B24,133 datasheet, BZX79-B24,133 pinout, BZX79-B24,133 application, or BZX79-B24,133 equivalent, key selection criteria include Zener voltage tolerance, thermal coefficient, dynamic impedance, surge capability (1.25 A non-repetitive peak reverse current), and DO-35 package compatibility with manual or wave soldering.
Technical Context
This device operates as a two-terminal passive voltage reference, relying on controlled avalanche breakdown in silicon PN junction. Its −22 mV/K temperature coefficient near 24 V indicates negative drift compensated by series resistor trimming in precision references.
Designed for DC stabilization only, it lacks transient suppression features of TVS diodes and does not support bidirectional clamping. Thermal resistance is 380 K/W (junction-to-ambient) with standard lead length, limiting continuous dissipation to 400 mW at 50 °C ambient per IEC 60134 ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 23.5–24.5 V at IZ = 5 mA; defines precise DC reference point for feedback or biasing |
| Differential Resistance rdif | 60 Ω typical at IZ = 5 mA; determines output impedance and load regulation sensitivity |
| Temperature Coefficient SZ | −22 mV/K at IZ = 5 mA; quantifies voltage drift over operating temperature range |
| Power Dissipation Ptot | 400 mW at Tamb = 50 °C; sets maximum steady-state power handling without heatsinking |
| Non-repetitive Peak Current IZSM | 1.25 A for tp = 100 μs; supports brief overvoltage events without failure |
| Reverse Leakage IR | 50 nA at VR = 16.8 V; ensures minimal quiescent current in high-impedance reference nodes |
| Diode Capacitance Cd | 55 pF at f = 1 MHz, VR = 0 V; affects high-frequency noise coupling in sensitive analog paths |
Pinout & Package
Hermetically sealed axial-leaded glass package per SOD27 (DO-35) outline: 4.25 mm body length, 1.85 mm diameter, 25.4 mm lead spacing. Cathode identified by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential node; enables forward bias operation below 0.9 V |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher potential node to enable reverse-biased regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter closed-loop regulation than ±5% variants, reducing need for external trimming |
| Low differential resistance (60 Ω typ.) | Minimizes output voltage variation under load changes in reference applications |
| Controlled negative temperature coefficient | Allows predictable compensation when paired with positive-TC components in precision references |
| 40 W non-repetitive peak power rating | Provides margin against short-duration transients without requiring additional protection devices |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reference |
|---|---|
Use Scenario: Providing stable 24 V bias to bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Zener diode acts as primary voltage reference for op-amp instrumentation amplifier gain setting. Use Value: ±2% tolerance and 60 Ω dynamic impedance ensure <0.5% full-scale error across 0–70 °C operating range. | Use Scenario: Generating accurate 2.4 V reference for ADC input scaling in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Used in resistive divider with 24 V Zener to derive sub-5 V reference via ratio matching. Use Value: −22 mV/K TC allows predictable offset correction in firmware using ambient temperature readings. |
| Linear Power Supply Feedback | LED Driver Current Setpoint |
Use Scenario: Setting output voltage of adjustable 3-terminal linear regulator (e.g., LM317) in lab bench supplies. IC Role / Device Role / Timing Role: Zener replaces potentiometer wiper to fix regulated output at 24 V ±0.5 V. Use Value: 400 mW power rating supports continuous operation at 20 mA bias current without derating. | Use Scenario: Establishing constant-current setpoint for discrete transistor LED driver in signage applications. IC Role / Device Role / Timing Role: Provides fixed reference voltage across sense resistor to define LED current magnitude. Use Value: 55 pF capacitance avoids instability in high-gain current mirror configurations at switching frequencies up to 100 kHz. |
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 | 24 V ±5%, 20 Ω rdif, +11 mV/K TC, DO-41 package | Higher power (1 W), looser tolerance, positive TC limits temp-compensation flexibility | Prefer where cost sensitivity outweighs precision and thermal stability requirements |
| BZX84-C24 | 24 V ±5%, 90 Ω rdif, SOT-23 surface-mount package | Smaller footprint but higher dynamic impedance and no hermetic sealing | Select for automated assembly and space-constrained PCBs where 5% tolerance is acceptable |
Compared with BZX79-B24,133, the 1N4749A offers higher surge robustness but sacrifices voltage accuracy and thermal predictability; the BZX84-C24 enables miniaturization at the expense of long-term reliability in humid environments due to plastic packaging.
Availability
BZX79-B24,133 is available at Aetrix Electronics and suitable for industrial sensor conditioning, linear power supply feedback, and LED driver current setpoint applications requiring stable component supply and long-lifecycle availability.
Supply support for BZX79-B24,133 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, with focus on automotive, industrial, and computing markets.
The BZX79 series belongs to Nexperia's legacy Zener diode portfolio, designed specifically for low-power, high-stability DC voltage reference and regulation in cost-sensitive, space-constrained analog circuits.
FAQ
What is the maximum continuous Zener current for BZX79-B24,133 at 50 °C ambient?
The maximum continuous Zener current is calculated from Ptot = 400 mW and VZ ≈ 24 V, yielding ~16.7 mA. This assumes no additional thermal resistance from PCB layout or airflow; actual usable current may be lower if board copper area is minimal or ambient exceeds 50 °C.
Can BZX79-B24,133 be used in place of a 24 V TVS diode for ESD protection?
No - BZX79-B24,133 is rated for non-repetitive surges only (100 μs, 1.25 A). It lacks the clamping speed, bidirectional capability, and energy absorption (Joules) required for IEC 61000-4-2 ESD protection. Use dedicated TVS devices like PESD5V0S1BA for that function.
How does the −22 mV/K temperature coefficient affect circuit performance above 70 °C?
At 100 °C junction temperature, the Zener voltage drops by ~1.1 V from its 25 °C value (ΔT = 75 K × −22 mV/K). This must be accounted for in reference-critical designs; compensation techniques include series thermistors or digital calibration using temperature sensor data.
Is the SOD27 (DO-35) package compatible with reflow soldering processes?
No - the hermetically sealed glass SOD27 package is not rated for reflow. It is intended for through-hole wave soldering or hand-soldering with localized heat control. Reflow exposure risks internal cracking or seal failure; use surface-mount alternatives like BZX84-C24 for reflow-compatible designs.
BZX79-B24,133 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 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-B24,133 FAQ
1.How can I place an order for BZX79-B24,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B24,133 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-B24,133 reliable?
The price and inventory of BZX79-B24,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B24,133 is usually 5 days.
3.What payment methods are accepted for BZX79-B24,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B24,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B24,133?
BZX79-B24,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B24,133 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-B24,133?
For technical support, including BZX79-B24,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B24,133 requirements.
6.How does Aetrix verify that BZX79-B24,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-B24,133 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-B24,133 meets industry standards.
7.What is the process for return or replacement of BZX79-B24,133?
All BZX79-B24,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B24,133, 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-B24,133 part is unused and in its original packaging.
Return procedure for BZX79-B24,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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