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

Nexperia USA Inc. NZX20C,133

Name: NZX20C,133
Brand: Nexperia USA Inc.
SKU: NZX20C,133
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NZX20C,133

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: NZX20C,133.pdf

Description:: DIODE ZENER 20.7V 500MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:9,866

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Product details

Overview

NZX20C,133 from Nexperia is a single Zener diode in a hermetically sealed SOD27 (SC-40) glass package, designed for precision voltage regulation at 20.2–21.2 V nominal Zener voltage with 60 Ω typical differential resistance and ≤0.05 µA reverse leakage at I_Z = 2 mA. It delivers stable reference performance in low-power analog circuits, power supply feedback paths, and overvoltage protection nodes where thermal stability and low noise are critical.

For engineers reviewing the NZX20C,133 datasheet, NZX20C,133 pinout, NZX20C,133 application, or NZX20C,133 equivalent, key selection criteria include Zener voltage tolerance (±5%), junction-to-ambient thermal resistance (380 K/W), maximum power dissipation (500 mW), and cathode-anode polarity marking on axial leads - all essential for reliable biasing and clamping design.

Technical Context

This device operates as a two-terminal voltage reference using avalanche breakdown in silicon, optimized for DC regulation rather than transient suppression. Its 20.2–21.2 V working range targets mid-range industrial supply rails, with temperature coefficient behavior characterized across 25–150 °C and specified at I_Z = 2 mA.

The SOD27 package enables axial through-hole mounting on FR4 PCBs without thermal pads, supporting operation from −65 °C to +175 °C ambient. Thermal resistance values (R_th(j-a) = 380 K/W, R_th(j-t) = 300 K/W) reflect its reliance on lead conduction for heat dissipation, limiting continuous current to 250 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	20.2 V min / 21.2 V max at I_Z = 2 mA - defines tight regulation window for 20 V rail stabilization
Differential Resistance (r_dif)	60 Ω max - ensures minimal output voltage shift under load current variation
Reverse Leakage (I_R)	≤0.05 µA at V_R = 14 V - guarantees negligible quiescent current in high-impedance reference nodes
Total Power Dissipation (P_tot)	500 mW at T_tp ≤ 25 °C - sets absolute thermal limit for continuous DC operation
Junction Temperature (T_j)	175 °C max - determines maximum allowable internal die temperature before degradation
Forward Voltage (V_F)	1.5 V max at I_F = 200 mA - supports use as low-drop rectifier or clamp in bidirectional circuits

Pinout & Package

The NZX20C,133 uses a hermetically sealed SOD27 (SC-40) axial glass package with two leads: anode (lead 2) and cathode (lead 1), marked by a band on the cathode end. Mounting requires ≤8 mm lead length on FR4 PCB for thermal compliance.

Pin/Terminal	Circuit Role	Design Meaning
1 (banded end)	Cathode	Connected to regulated output node; reverse-biased during Zener operation
2 (unbanded end)	Anode	Connected to ground or lower-potential rail; establishes reference polarity

Key Features

Feature	Design Value
Hermetic glass sealing	Prevents moisture ingress and long-term parameter drift in humid environments
Low differential resistance	60 Ω max improves regulation accuracy under varying load conditions
Low leakage current	≤0.05 µA minimizes error in high-impedance voltage divider or sensing circuits
Wide operating temperature	−65 °C to +175 °C ambient enables deployment in industrial and automotive under-hood applications

Applications

Power Supply Feedback Loop

Overvoltage Clamp Node

Use Scenario: Stabilizing output voltage in linear regulator feedback path with TL431 or discrete op-amp comparator.

IC Role / Device Role / Timing Role: Provides precise 20.7 V reference point for error amplifier comparison.

Use Value: Tight ±5% V_Z tolerance and low r_dif reduce output voltage drift across line/load/temperature.

Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 21 V.

IC Role / Device Role / Timing Role: Acts as shunt clamp, conducting excess current when input exceeds 21.2 V.

Use Value: Low leakage (<0.05 µA) avoids false triggering; fast avalanche response limits voltage overshoot.

Reference Voltage Source

Current Source Biasing

Use Scenario: Generating stable bias for analog sensor signal conditioning circuitry in industrial transmitters.

IC Role / Device Role / Timing Role: Supplies fixed 20.7 V reference to op-amp gain-setting network.

Use Value: Hermetic packaging ensures long-term V_Z stability in harsh environmental conditions.

Use Scenario: Setting constant current for LED driver or laser diode bias via series resistor and Zener drop.

IC Role / Device Role / Timing Role: Maintains fixed voltage across current-setting resistor to define I_OUT.

Use Value: 60 Ω r_dif ensures <1% current error across 10–90% load range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55-C20	V_Z = 20 V ±5%, r_dif = 70 Ω max, P_tot = 500 mW, DO-35 package	Higher differential resistance increases regulation error under load variation	Select when DO-35 footprint compatibility is required and tighter r_dif is not critical
1N4740A	V_Z = 10 V ±5%, r_dif = 22 Ω max, P_tot = 1 W, DO-41 package	Half the Zener voltage and double the power rating; incompatible for 20 V reference needs	Use only if redesigning for 10 V reference and higher power margin is acceptable

Compared with BZX55-C20 and 1N4740A, NZX20C,133 offers superior thermal stability (175 °C T_j rating), hermetic reliability, and matched 20.7 V regulation - making it optimal for precision, long-life industrial references where voltage accuracy and environmental resilience are prioritized over raw power handling.

Availability

NZX20C,133 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and embedded system protection circuits requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for NZX20C,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 focused on high-volume, high-reliability logic, discrete, and MOSFET devices, serving automotive, industrial, and consumer markets with robust, scalable solutions.

The NZX series targets general-purpose Zener regulation with hermetic reliability and tight voltage tolerances, specifically engineered for stable DC reference and clamping in cost-sensitive, thermally demanding applications.

FAQ

What is the Zener voltage tolerance for NZX20C,133?

The NZX20C,133 has a nominal Zener voltage of 20.7 V with a minimum of 20.2 V and maximum of 21.2 V at I_Z = 2 mA, corresponding to a ±5% tolerance band. This is confirmed in Table 9 of the Nexperia datasheet Rev. 4 (2011), which specifies the "C" grade for this part number.

Can NZX20C,133 be used in surface-mount designs?

No - NZX20C,133 uses the axial-leaded SOD27 (SC-40) glass package and is intended for through-hole mounting only. It lacks solder pads or gull-wing leads required for reflow assembly. For SMT equivalents, consider Nexperia's BZV55 or PZM series Zeners in SOD-123 or SOT-23 packages.

What is the maximum forward current rating?

The absolute maximum forward current is 250 mA, per Table 5 (Limiting Values) in the datasheet. At this level, forward voltage remains ≤1.5 V (Table 7), but sustained operation near this limit requires careful thermal management due to the 380 K/W junction-to-ambient resistance.

Does NZX20C,133 have automotive qualification?

No - the datasheet explicitly states "Non-automotive qualified products" in Section 11.3, and no AEC-Q101 stress test data or automotive-grade screening is referenced. It is rated for industrial temperature range (−65 °C to +175 °C ambient), but not validated for automotive reliability or qualification requirements.

NZX20C,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):: 20.7 V

Tolerance:: ±2%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 60 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 14 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

NZX20C,133 FAQ

1.How can I place an order for NZX20C,133 through Aetrix?

Please submit a Request for Quotation (RFQ) for NZX20C,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 NZX20C,133 reliable?

The price and inventory of NZX20C,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NZX20C,133 is usually 5 days.

3.What payment methods are accepted for NZX20C,133?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NZX20C,133 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NZX20C,133?

NZX20C,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NZX20C,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 NZX20C,133?

For technical support, including NZX20C,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NZX20C,133 requirements.

6.How does Aetrix verify that NZX20C,133 is sourced from the original manufacturer or authorized distributors?

All NZX20C,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 NZX20C,133 meets industry standards.

7.What is the process for return or replacement of NZX20C,133?

All NZX20C,133 units undergo pre-shipment inspection (PSI). If there is an issue with NZX20C,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 NZX20C,133 part is unused and in its original packaging.

Return procedure for NZX20C,133:

1.Submit a request within 90 days.

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

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