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Nexperia USA Inc. BZX79-B33,143
- Part No.:
- BZX79-B33,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B33,143.pdf
- Description:
- DIODE ZENER 33V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:4,648
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Product details
Overview
BZX79-B33,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal breakdown voltage of 33 V at 2 mA test current, 75 Ω typical differential resistance, and −23.3 mV/K temperature coefficient. It operates as a low-power voltage reference in bias networks, feedback loops, and overvoltage protection circuits, rated for 500 mW total power dissipation at 50 °C ambient.
For engineers reviewing the BZX79-B33,143 datasheet, BZX79-B33,143 pinout, BZX79-B33,143 application, or BZX79-B33,143 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal coefficient behavior across operating current, non-repetitive surge capability (45 A peak reverse current), and DO-35 package compatibility with through-hole PCB layouts.
Technical Context
This device functions as a two-terminal passive voltage reference, relying on controlled avalanche breakdown in silicon PN junction. Its regulation performance is defined at IZtest = 2 mA per Table 2, with differential resistance measured under small-signal AC conditions to reflect dynamic impedance near the knee.
The temperature coefficient of −23.3 mV/K (typical) indicates negative drift with rising junction temperature - a critical factor when used in precision references without compensation. Reverse leakage remains ≤50 nA at 0.7×VZnom, supporting stable operation in high-impedance sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.3 V to 33.7 V at IZ = 2 mA - ensures tight regulation within ±2% tolerance band for reference stability |
| Differential Resistance (rdif) | 75 Ω typ., 325 Ω max. at IZ = 2 mA - defines output impedance affecting load regulation error |
| Temperature Coefficient (SZ) | −23.3 mV/K typ. at IZ = 2 mA - quantifies voltage drift per degree Celsius, critical for unbuffered references |
| Reverse Leakage (IR) | ≤50 nA at VR = 23.1 V (0.7×VZnom) - enables use in high-Z bias networks without significant current error |
| Non-repetitive Peak Current (IZSM) | 45 A at tp = 100 μs - supports transient overvoltage clamping in surge-limited circuits |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets maximum continuous DC power handling under standard mounting conditions |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a black band. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to lower potential node; carries forward current up to 250 mA during transient conduction |
| Cathode | Zener breakdown terminal / regulated output node | Marked with band; referenced point for voltage stabilization; reverse-biased during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables precise voltage referencing without post-calibration in mid-accuracy analog circuits |
| 500 mW power rating at 50 °C | Supports continuous operation in compact industrial control modules with limited heatsinking |
| DO-35 axial glass package | Provides hermetic sealing and proven reliability for long-term storage and humid environments |
| −23.3 mV/K tempco (typ.) | Allows predictable drift modeling in temperature-compensated reference designs using matched components |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Used in TL431-based adjustable SMPS feedback divider to set output voltage with improved accuracy. IC Role / Device Role / Timing Role: Provides stable 33 V reference for optocoupler LED biasing and error amplifier threshold setting. Use Value: Tight ±2% tolerance reduces output voltage variation across production batches without trimming. | Use Scenario: Placed across analog sensor supply rail (e.g., 24 V industrial transducer) to limit fault voltage. IC Role / Device Role / Timing Role: Acts as passive crowbar element absorbing transient energy during ESD or inductive kick events. Use Value: 45 A non-repetitive surge rating handles IEC 61000-4-2 contact discharge without degradation. |
| Low-Power Bias Network Reference | Comparator Threshold Stabilization |
Use Scenario: Supplies reference voltage to op-amp input stage in battery-powered instrumentation. IC Role / Device Role / Timing Role: Delivers stable 33 V node for high-impedance biasing of FET gate drivers or amplifier inputs. Use Value: ≤50 nA leakage at 23.1 V ensures minimal current draw in microamp-level standby modes. | Use Scenario: Sets fixed trip point for window comparator monitoring 24 V system rail health. IC Role / Device Role / Timing Role: Defines upper threshold voltage independent of supply ripple or temperature drift. Use Value: Negative tempco allows partial cancellation against positive-drift comparators in wide-temp applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4747A | 33 V ±5%, 700 mW rating, DO-41 package, higher leakage (1 μA @ 23.1 V) | Higher power handling but looser tolerance; less suitable for precision feedback | Select when cost sensitivity outweighs voltage accuracy and board space permits larger DO-41 footprint |
| BZX84-C33 | 33 V ±5%, SOT-23 surface-mount, 300 mW rating, 100 nA leakage @ 23.1 V | Smaller size and automated assembly compatible, but lower surge rating (25 A) | Select for space-constrained PCBs where reflow compatibility and pick-and-place efficiency are prioritized |
Compared with BZX79-B33,143, the 1N4747A offers higher power margin but sacrifices regulation accuracy and leakage performance, while the BZX84-C33 trades surge robustness and through-hole reliability for miniaturization and assembly automation - choice depends on priority between precision, ruggedness, or footprint.
Availability
BZX79-B33,143 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface protection circuits, and analog bias network design requiring stable component supply and long-term obsolescence resilience.
Supply support for BZX79-B33,143 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, focused on automotive, industrial, and computing applications.
The BZX79 series belongs to Nexperia's legacy Zener diode product line, engineered for reliable low-power voltage regulation in cost-sensitive, high-volume applications where stability and manufacturability are essential.
FAQ
What is the maximum continuous reverse power this diode can handle?
The BZX79-B33,143 is rated for 500 mW total power dissipation at an ambient temperature of 50 °C with leads trimmed to 8 mm. Derating is required above that temperature - thermal resistance from junction to ambient is 380 K/W, so at 70 °C ambient, maximum continuous power drops to approximately 395 mW to maintain safe junction temperature.
Does this Zener diode have a specified forward voltage?
Yes - forward voltage is specified as 0.9 V maximum at 10 mA forward current and 25 °C junction temperature. This value reflects the silicon PN junction's conduction characteristic and is relevant for applications involving bidirectional clamping or polarity detection where forward conduction may occur.
Can BZX79-B33,143 be used in place of a 33 V Zener with ±5% tolerance?
Yes, but only where tighter regulation is beneficial - its ±2% tolerance provides improved accuracy over ±5% variants like BZX79-C33. However, it is not a direct drop-in replacement in circuits relying on higher leakage or different tempco behavior, as BZX79-B33 exhibits lower IR and more negative SZ than its ±5% counterpart.
Is the DO-35 package lead-free and RoHS compliant?
Yes - Nexperia confirms the BZX79-B33,143 meets RoHS Directive 2011/65/EU requirements. The DO-35 package uses lead-free tinning on copper-clad steel leads, and the glass body contains no restricted substances above threshold limits, verified per IEC 62321 testing protocols.
BZX79-B33,143 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):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 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-B33,143 FAQ
1.How can I place an order for BZX79-B33,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B33,143 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-B33,143 reliable?
The price and inventory of BZX79-B33,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B33,143 is usually 5 days.
3.What payment methods are accepted for BZX79-B33,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B33,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B33,143?
BZX79-B33,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B33,143 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-B33,143?
For technical support, including BZX79-B33,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B33,143 requirements.
6.How does Aetrix verify that BZX79-B33,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-B33,143 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-B33,143 meets industry standards.
7.What is the process for return or replacement of BZX79-B33,143?
All BZX79-B33,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B33,143, 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-B33,143 part is unused and in its original packaging.
Return procedure for BZX79-B33,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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