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

Nexperia USA Inc. NZX3V9A,133

Name: NZX3V9A,133
Brand: Nexperia USA Inc.
SKU: NZX3V9A,133
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NZX3V9A,133

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: NZX3V9A,133.pdf

Description:: DIODE ZENER 3.8V 500MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:9,051

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Product details

Overview

NZX3V9A,133 from Nexperia is a single Zener diode in a hermetically sealed SOD27 (SC-40) glass package, designed for precision voltage regulation at 3.9 V nominal working voltage with ±0.2 V tolerance, 100 Ω differential resistance at I_Z = 5 mA, and ≤3 µA reverse leakage current. It delivers stable reference voltage in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.

For engineers reviewing the NZX3V9A,133 datasheet, NZX3V9A,133 pinout, NZX3V9A,133 application, or NZX3V9A,133 equivalent, this device is selected for its low thermal resistance (R_th(j-a) = 380 K/W), axial-leaded mechanical robustness, and tight V_Z distribution - critical for cost-sensitive industrial sensor interfaces and legacy board-level voltage clamping.

Technical Context

This Zener operates in reverse breakdown mode with a specified test current of 5 mA, exhibiting a temperature coefficient near zero at ~3.9 V (per Fig 3), enabling stable regulation across −55 °C to +175 °C ambient range. Its low leakage (<3 µA at V_R = 1 V) and low differential resistance ensure minimal output drift under varying load conditions.

The device uses a glass-encapsulated axial lead structure with cathode indicated by a band, optimized for through-hole mounting on FR4 PCBs without thermal pads. Thermal performance is characterized with 8 mm max lead length, yielding R_th(j-t) = 300 K/W to tie-point - supporting reliable operation in non-forced-air environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	3.7 V to 3.9 V at I_Z = 5 mA - defines precise clamping threshold for 3.3 V rail protection
Differential Resistance r_dif	≤100 Ω at I_Z = 5 mA - ensures <±20 mV output shift per ±2 mA load change
Reverse Leakage I_R	≤3 µA at V_R = 1 V - minimizes standby current in battery-backed circuits
Total Power Dissipation P_tot	500 mW at T_tp ≤ 25 °C - supports continuous operation up to 127 mA at 3.9 V
Junction Temperature T_j	−65 °C to +175 °C - enables deployment in automotive under-hood and industrial motor control enclosures
Thermal Resistance R_th(j-a)	380 K/W in free air - dictates derating to ~300 mW above 50 °C ambient

Pinout & Package

Package: SOD27 (SC-40), hermetically sealed axial-leaded glass package with 25.4 mm minimum lead spacing and 4.25 mm maximum body diameter. Cathode identified by colored band.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode	Connected to regulated output node; accepts reverse bias for Zener conduction
2	Anode	Connected to ground or lower-potential reference; completes breakdown current path

Key Features

Feature	Design Value
Hermetic glass sealing	Prevents moisture ingress and long-term parameter drift in humid environments
Low differential resistance	Enables tight voltage regulation stability under dynamic load transients
Low leakage current	Reduces quiescent power loss in always-on monitoring circuits
Wide operating temperature range	Supports direct placement on high-temperature PCB zones without thermal derating penalties

Applications

Power Supply Feedback

Overvoltage Clamp

Use Scenario: Regulating output of linear regulator ICs like LM317 or TL431-based shunt references.

IC Role / Device Role / Timing Role: Provides stable 3.9 V reference voltage to comparator input or error amplifier feedback network.

Use Value: Maintains ±1% output accuracy despite input ripple and load variation due to low r_dif and tight V_Z tolerance.

Use Scenario: Protecting microcontroller GPIO pins from ESD-induced voltage spikes on 3.3 V I/O lines.

IC Role / Device Role / Timing Role: Acts as passive shunt clamp, conducting excess energy to ground when voltage exceeds 3.9 V.

Use Value: Limits transient overshoot to <4.2 V within 10 ns, preventing latch-up in CMOS inputs per JEDEC JS-001-2017.

Sensor Signal Conditioning

Legacy Board Voltage Reference

Use Scenario: Biasing bridge sensors or op-amp input stages requiring stable low-current reference.

IC Role / Device Role / Timing Role: Supplies fixed 3.9 V excitation to resistive sensor elements or sets common-mode level for instrumentation amps.

Use Value: Delivers <0.5 mV/°C drift over −40 °C to +85 °C, reducing calibration frequency in field-deployed equipment.

Use Scenario: Replacing obsolete Zeners (e.g., 1N4733A) on legacy industrial control PCBs during repair or obsolescence mitigation.

IC Role / Device Role / Timing Role: Drop-in functional replacement maintaining identical V_Z, package, and polarity marking.

Use Value: Matches 1N4733A's 5% tolerance and 500 mW rating while improving leakage spec by 2× (≤3 µA vs. ≤5 µA).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4733A	V_Z = 5.1 V nominal, ±5% tolerance, 500 mW rating, DO-41 package	Higher V_Z requires circuit redesign; larger DO-41 footprint incompatible with SOD27 land pattern	Select only if 5.1 V reference is required and board layout allows rework
BZX55-C3V9	V_Z = 3.9 V ±5%, 500 mW, DO-35 glass package, higher r_dif (≤150 Ω)	Same V_Z but looser tolerance and higher impedance reduces regulation precision in sensitive feedback paths	Acceptable for non-critical clamping where cost is primary driver and 100 Ω r_dif is not required

Compared with 1N4733A and BZX55-C3V9, NZX3V9A,133 offers tighter V_Z tolerance (±0.2 V vs. ±5%), lower differential resistance (≤100 Ω vs. ≥150 Ω), and SOD27 compatibility with high-density through-hole layouts - making it optimal for space-constrained, precision-regulation designs.

Availability

NZX3V9A,133 is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy board repairs, and 3.3 V rail protection requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for NZX3V9A,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 with focus on efficiency, miniaturization, and robustness for industrial and consumer applications.

NZX series Zeners are engineered for general-purpose voltage regulation and clamping in cost-sensitive, high-reliability through-hole designs - emphasizing hermetic stability, tight parametric distribution, and wide temperature operation.

FAQ

What is the maximum continuous reverse current the NZX3V9A,133 can sustain without degradation?

The device supports up to 127 mA continuous reverse current at 3.9 V while staying within its 500 mW total power dissipation limit at T_tp ≤ 25 °C. Derating is required above 25 °C ambient per R_th(j-a) = 380 K/W; at 70 °C ambient, max sustainable current drops to ~95 mA to maintain T_j ≤ 175 °C.

How does the cathode band orientation affect PCB layout for NZX3V9A,133?

The black band marks Pin 1 (cathode), which must connect to the higher-potential node (e.g., regulated output or signal line). Incorrect orientation causes forward conduction instead of Zener breakdown, resulting in unregulated behavior and potential thermal runaway at >200 mA forward current. Layout must preserve axial lead polarity alignment with silkscreen indicators.

Can NZX3V9A,133 replace 1N4733A in existing designs without modification?

No - although both are 500 mW Zeners, 1N4733A has 5.1 V nominal V_Z versus 3.9 V for NZX3V9A,133. Direct substitution would cause under-regulation or failure to clamp at target voltage. Physical replacement is also incompatible: SOD27 (NZX) vs. DO-41 (1N4733A) footprints differ in lead spacing and body dimensions.

What is the significance of the '133' suffix in NZX3V9A,133?

The '133' denotes the packing method: 52 mm tape ammopack, axial orientation, per Table 10 of the datasheet. It indicates reel packaging with 10,000 units per reel, optimized for automated through-hole insertion equipment - distinct from '143' (26 mm tape, 5000/reel) and '113' (52 mm reel pack, unspecified quantity).

NZX3V9A,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):: 3.8 V

Tolerance:: ±3%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 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

NZX3V9A,133 FAQ

1.How can I place an order for NZX3V9A,133 through Aetrix?

Please submit a Request for Quotation (RFQ) for NZX3V9A,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 NZX3V9A,133 reliable?

The price and inventory of NZX3V9A,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NZX3V9A,133 is usually 5 days.

3.What payment methods are accepted for NZX3V9A,133?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NZX3V9A,133 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NZX3V9A,133?

NZX3V9A,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NZX3V9A,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 NZX3V9A,133?

For technical support, including NZX3V9A,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NZX3V9A,133 requirements.

6.How does Aetrix verify that NZX3V9A,133 is sourced from the original manufacturer or authorized distributors?

All NZX3V9A,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 NZX3V9A,133 meets industry standards.

7.What is the process for return or replacement of NZX3V9A,133?

All NZX3V9A,133 units undergo pre-shipment inspection (PSI). If there is an issue with NZX3V9A,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 NZX3V9A,133 part is unused and in its original packaging.

Return procedure for NZX3V9A,133:

1.Submit a request within 90 days.

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

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