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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. NZX33A,133

Name: NZX33A,133
Brand: Nexperia USA Inc.
SKU: NZX33A,133
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NZX33A,133

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: NZX33A,133.pdf

Description:: DIODE ZENER 31.9V 500MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:37,298

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Product details

Overview

NZX33A,133 from Nexperia is a single Zener diode in a hermetically sealed SOD27 (SC-40) glass package, designed for precision voltage regulation and reference functions at 33 V nominal Zener voltage with ±5% tolerance, 120 Ω differential resistance at I_Z = 2 mA, and ≤0.05 µA reverse leakage current. It operates across −65 °C to +175 °C ambient range and delivers stable regulation in low-power analog circuits, power supply feedback paths, and overvoltage protection nodes.

For engineers reviewing the NZX33A,133 datasheet, NZX33A,133 pinout, NZX33A,133 application, or NZX33A,133 equivalent, this component serves as a temperature-stable, low-leakage voltage reference for industrial sensor signal conditioning, DC-DC converter feedback loops, and programmable logic controller (PLC) input protection - where tight V_Z tolerance and low thermal drift are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal working voltage of 33 V at I_Z = 2 mA, exhibiting a typical temperature coefficient near zero crossing in the 30–36 V range. Its low differential resistance (120 Ω max) ensures minimal output voltage variation under load changes.

Thermal performance is defined by R_th(j-a) = 380 K/W in free air on FR4 PCB, and it maintains stable operation up to T_j = 175 °C. The device uses axial-leaded SOD27 packaging with cathode indicated by a band, enabling manual or wave-solder assembly in high-reliability environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	31.2 V to 32.6 V at I_Z = 2 mA - defines precise regulation point for feedback and reference circuits
Differential Resistance (r_dif)	≤120 Ω at I_Z = 2 mA - ensures <1% output shift per 1 mA load change in regulation applications
Reverse Leakage Current (I_R)	≤0.05 µA at V_R = 23.1 V - enables ultra-low standby power in battery-backed systems
Total Power Dissipation (P_tot)	500 mW at T_tp ≤ 25 °C - supports continuous operation up to ~15 mA at 33 V without heatsinking
Junction Temperature Range	−65 °C to +175 °C - qualified for extended industrial and under-hood automotive auxiliary circuits
Package Type	SOD27 (SC-40) - hermetically sealed axial glass package with 25.4 mm lead spacing, suitable for high-humidity and corrosive environments

Pinout & Package

The NZX33A,133 is housed in a SOD27 (SC-40) hermetically sealed glass package with axial leads. The cathode is marked by a visible band on the glass body; the anode is the unmarked lead.

Pin/Terminal	Circuit Role	Design Meaning
1 (banded end)	Cathode	Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs
2 (unmarked end)	Anode	Connected to circuit ground or lower-potential rail; completes bias path for regulation

Key Features

Feature	Design Value
Hermetic glass sealing	Prevents moisture ingress and long-term parameter drift in humid or outdoor deployments
Low differential resistance	120 Ω max ensures <0.4 V output shift across 3.3 mA load variation - critical for precision references
Ultra-low leakage current	≤0.05 µA at 23.1 V enables microamp-level standby current in always-on monitoring circuits
Wide operating temperature range	−65 °C to +175 °C junction rating supports use in industrial motor drives and power converters without derating

Applications

Industrial Sensor Signal Conditioning

DC-DC Converter Feedback Reference

Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure transmitters in factory automation.

IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 33 V bias to bridge sensor circuitry.

Use Value: Tight 31.2–32.6 V tolerance and <120 Ω r_dif minimize span error and improve measurement repeatability across temperature.

Use Scenario: Setting output voltage in isolated flyback converters for PLC I/O modules.

IC Role / Device Role / Timing Role: Primary-side Zener clamp defining feedback threshold for optocoupler-driven regulation.

Use Value: Low leakage (<0.05 µA) prevents false triggering during light-load conditions; hermetic seal ensures reliability over 10+ year field life.

Programmable Logic Controller Input Protection

Overvoltage Clamp for Microcontroller GPIO

Use Scenario: Protecting 24 V digital input channels against transient surges in manufacturing equipment.

IC Role / Device Role / Timing Role: Shunt clamping device limiting input voltage to safe levels during ESD or inductive kick events.

Use Value: Fast response (ns-scale) and 500 mW P_tot allow absorption of 100 ns/1 A transients without degradation.

Use Scenario: Safeguarding 3.3 V MCU GPIO pins exposed to external 24 V field wiring in smart sensors.

IC Role / Device Role / Timing Role: Standby-mode Zener clamp referenced to local ground, activated only during overvoltage faults.

Use Value: Sub-µA leakage preserves sleep current budget; SOD27 axial form factor simplifies hand-soldered prototyping and repair.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55-C33 (ON Semiconductor)	Same 33 V nominal V_Z, but ±5% tolerance and higher r_dif (≤200 Ω); plastic DO-35 package	Limited to commercial temperature range (−65 °C to +175 °C not guaranteed); no hermetic seal	Select when cost sensitivity outweighs long-term stability and humidity resilience
1N5257B (Microchip)	33 V V_Z, ±5%, but higher leakage (≤1 µA at 25.4 V) and lower P_tot (500 mW same, but derates faster above 70 °C)	DO-35 plastic package lacks hermeticity; not rated for extended high-temp operation	Choose only for non-critical, short-lifecycle consumer designs where qualification overhead is prohibitive

Compared with BZX55-C33 and 1N5257B, NZX33A,133 offers superior long-term stability via hermetic glass packaging, tighter thermal resistance control (R_th(j-a) = 380 K/W), and verified performance across full industrial temperature extremes - making it the preferred choice for infrastructure-grade electronics requiring >10-year field reliability.

Availability

NZX33A,133 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, DC-DC converter feedback reference, and programmable logic controller input protection requiring stable component supply and long-term parametric consistency.

Supply support for NZX33A,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 semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET devices optimized for efficiency, miniaturization, and robustness in industrial, automotive, and computing applications.

The NZX series targets general-purpose Zener regulation with hermetic reliability, offering 112 voltage options from 2.1 V to 36 V in axial-glass packages for applications demanding long-term stability and environmental resilience.

FAQ

What is the maximum steady-state current for NZX33A,133 at 25 °C ambient?

At T_amb = 25 °C and with no heatsinking, the maximum continuous Zener current is calculated as P_tot/V_Z ≈ 500 mW / 32 V ≈ 15.6 mA. Derating applies above 25 °C per R_th(j-a) = 380 K/W; full 500 mW dissipation is only valid at case temperature ≤25 °C.

Does NZX33A,133 have a specified temperature coefficient?

Yes - for the 33 V variant (NZX33A), the temperature coefficient is approximately +3.5 mV/K near 2 mA, based on Figure 4 in the datasheet. This value reflects typical behavior across 25–150 °C and supports predictable compensation in reference designs.

Can NZX33A,133 be used in place of a 33 V Zener in a TO-92 package?

No - NZX33A,133 uses SOD27 (SC-40) axial glass packaging with 25.4 mm lead spacing and hermetic sealing, while TO-92 is plastic, radial, and non-hermetic. Mechanical fit, thermal profile, and long-term reliability differ significantly; direct substitution requires board layout and qualification revalidation.

Is NZX33A,133 automotive-qualified?

No - the datasheet explicitly states "Non-automotive qualified products" and confirms this part is not tested or warranted for automotive applications. It lacks AEC-Q200 stress testing and is intended for industrial, computing, and general electronics use only.

NZX33A,133 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: NZX

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Cut Tape (CT)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 31.9 V

Tolerance:: ±2%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 120 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 23.1 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -55°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ALF2

NZX33A,133 FAQ

1.How can I place an order for NZX33A,133 through Aetrix?

Please submit a Request for Quotation (RFQ) for NZX33A,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 NZX33A,133 reliable?

The price and inventory of NZX33A,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NZX33A,133 is usually 5 days.

3.What payment methods are accepted for NZX33A,133?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NZX33A,133 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NZX33A,133?

NZX33A,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NZX33A,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 NZX33A,133?

For technical support, including NZX33A,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NZX33A,133 requirements.

6.How does Aetrix verify that NZX33A,133 is sourced from the original manufacturer or authorized distributors?

All NZX33A,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 NZX33A,133 meets industry standards.

7.What is the process for return or replacement of NZX33A,133?

All NZX33A,133 units undergo pre-shipment inspection (PSI). If there is an issue with NZX33A,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 NZX33A,133 part is unused and in its original packaging.

Return procedure for NZX33A,133:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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