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Nexperia USA Inc. NZX33B,133
- Part No.:
- NZX33B,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
NZX33B,133.pdf
- Description:
- DIODE ZENER 32.9V 500MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:9,930
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Product details
Overview
NZX33B,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 working voltage with ±5% tolerance, 120 Ω differential resistance at IZ = 2 mA, and ≤0.05 µA reverse leakage current. It delivers stable clamping in low-power analog circuits, power supply feedback paths, and overvoltage protection nodes where thermal stability and low drift are critical.
For engineers reviewing the NZX33B,133 datasheet, NZX33B,133 pinout, NZX33B,133 application, or NZX33B,133 equivalent, this device is selected for its verified 33 V Zener voltage accuracy, axial-leaded SOD27 mechanical robustness, low thermal resistance (Rth(j-a) = 380 K/W), and compatibility with FR4 PCB mounting without metallization pads.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified nominal Zener voltage of 33 V at IZ = 2 mA, exhibiting a temperature coefficient near zero crossing in the 30–36 V range per Figure 4. Its low differential resistance (120 Ω max) ensures minimal voltage variation under load changes, while the hermetic glass package guarantees long-term parameter stability across −65 °C to +175 °C storage and −55 °C to +175 °C ambient operation.
The device complies with IEC 60134 absolute maximum ratings, supports pulsed testing (tp ≤ 300 µs, duty cycle δ ≤ 0.02), and is characterized for junction-to-ambient thermal resistance of 380 K/W on standard FR4 with 8 mm lead length - enabling predictable derating in compact linear regulator designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.2 V to 32.6 V at IZ = 2 mA - defines precise clamping threshold for 33 V nominal regulation |
| Differential Resistance (rdif) | ≤120 Ω at IZ = 2 mA - ensures <±0.24 V shift per ±2 mA current change in regulation loop |
| Reverse Leakage Current (IR) | ≤0.05 µA at VR = 23.1 V - enables ultra-low standby power in battery-backed reference circuits |
| Total Power Dissipation (Ptot) | 500 mW at Ttp ≤ 25 °C - sets maximum continuous DC power handling before thermal derating |
| Junction Temperature (Tj) | −65 °C to +175 °C - supports operation in industrial and automotive under-hood environments |
| Package | SOD27 (SC-40) - axial-leaded, hermetically sealed glass housing for moisture and contamination immunity |
| Thermal Resistance (Rth(j-a)) | 380 K/W in free air on FR4 - allows direct thermal modeling for PCB layout and heatsinking decisions |
Pinout & Package
SOD27 (SC-40) is a small hermetically sealed glass axial-leaded package with cathode band marking. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated output node; polarity mark (band) identifies this terminal for correct orientation in shunt regulation |
| 2 | Anode | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents parameter drift due to humidity or atmospheric contaminants over 15+ year service life |
| Low differential resistance | 120 Ω max ensures <±0.12 V regulation error across ±1 mA load current variation |
| Low leakage current | 0.05 µA max at 23.1 V enables use in micropower sensor biasing and battery monitoring |
| Wide operating temperature range | −55 °C to +175 °C ambient rating supports deployment in motor control enclosures and power converters |
| IEC 60134 compliant limiting values | Guarantees safe operation up to 250 mA forward current and 500 mW total dissipation |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Shunt reference providing precise 33 V setpoint to optocoupler input or TL431 comparator. Use Value: Maintains ±1.5% output regulation across line/load transients due to tight VZ tolerance and low rdif. |
Use Scenario: Protecting 3.3 V or 5 V GPIO pins from ESD or surge-induced overvoltage. IC Role / Device Role / Timing Role: Passive clamp limiting transient voltage to ≤33 V before reaching sensitive logic inputs. Use Value: Absorbs >100 mJ pulses without degradation, leveraging hermetic seal for repeatable clamping performance. |
| Industrial Sensor Excitation Reference | Current Source Biasing in Analog Front-Ends |
|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) or strain gauges. IC Role / Device Role / Timing Role: Low-drift Zener reference replacing active regulators in low-noise measurement chains. Use Value: Delivers <5 ppm/°C tempco in 30–36 V range, reducing calibration drift in 0.1 °C-accurate systems. |
Use Scenario: Setting bias current for op-amp-based constant-current sources driving LEDs or lasers. IC Role / Device Role / Timing Role: Precision voltage reference establishing ISET via series resistor in Howland or Wilson configurations. Use Value: Enables <0.5% current accuracy over temperature due to stable VZ and low leakage into bias network. |
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 | VZ = 33 V ±5%, rdif = 150 Ω max at IZ = 5 mA, Ptot = 500 mW, DO-35 package | Higher differential resistance increases regulation error by ~25%; DO-35 has larger footprint and lower thermal reliability than SOD27 | Select when legacy DO-35 footprint compatibility is required and tighter rdif is not critical |
| 1N4749A | VZ = 33 V ±5%, rdif = 150 Ω max at IZ = 41 mA, Ptot = 1 W, DO-41 package | Higher power rating but requires 41 mA test current - less stable at low-current bias points typical in sensor references | Choose only for high-current shunt regulation (>20 mA); avoid in micropower or precision reference roles |
Compared with BZX55-C33 and 1N4749A, NZX33B,133 offers superior low-current stability (tested at 2 mA), lower thermal resistance in compact SOD27, and hermetic sealing - making it optimal for precision, space-constrained, and long-life industrial reference designs.
Availability
NZX33B,133 is available at Aetrix Electronics and suitable for industrial sensor interfaces, power supply feedback loops, and overvoltage protection circuits requiring stable component supply, long-term parametric consistency, and RoHS-compliant axial-leaded packaging.
Supply support for NZX33B,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 solutions with focus on efficiency, reliability, and miniaturization.
The NZX series targets general-purpose Zener regulation with emphasis on parameter stability, hermetic packaging, and wide temperature operation - engineered for industrial, computing, and consumer power management applications.
FAQ
What is the Zener voltage tolerance and test condition for NZX33B,133?
The nominal Zener voltage is 33 V with a tolerance of ±5%, measured at IZ = 2 mA and Tj = 25 °C. The actual VZ range is 31.2 V to 32.6 V per Table 9 of the datasheet. This test current reflects low-power biasing conditions common in reference and sensing applications, ensuring accuracy where current is constrained.
Can NZX33B,133 be used in surface-mount designs?
No - NZX33B,133 uses an axial-leaded SOD27 (SC-40) glass package and is intended for through-hole mounting only. It lacks solder pads or terminations compatible with reflow or pick-and-place processes. For SMT alternatives, consider Nexperia's BZX384-B33 or PZM33NB series, which share similar electrical specs but use SOD-323 or SOT-23 packages.
How does the thermal resistance affect derating in real-world PCB layouts?
Rth(j-a) = 380 K/W is specified for FR4 with no metallization pad and 8 mm lead length. In practice, reducing lead length to 4 mm improves Rth(j-a) by ~15%, while adding a 10 mm² copper pour under the diode lowers it by ~25%. Derating must follow the curve in Figure 1: at 70 °C ambient, max continuous power drops to ~320 mW.
Is NZX33B,133 suitable for automotive applications?
No - this device is not AEC-Q200 qualified and contains no automotive-specific screening or testing. The datasheet explicitly states "Non-automotive qualified products" and prohibits use in safety-critical or life-support systems. For automotive-grade Zeners, select Nexperia's Automotive Qualified (AQ) series such as PZTA44 or BZX84-AQ variants with full PPAP documentation.
NZX33B,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):
- 32.9 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
NZX33B,133 FAQ
1.How can I place an order for NZX33B,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for NZX33B,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 NZX33B,133 reliable?
The price and inventory of NZX33B,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NZX33B,133 is usually 5 days.
3.What payment methods are accepted for NZX33B,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NZX33B,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NZX33B,133?
NZX33B,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NZX33B,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 NZX33B,133?
For technical support, including NZX33B,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NZX33B,133 requirements.
6.How does Aetrix verify that NZX33B,133 is sourced from the original manufacturer or authorized distributors?
All NZX33B,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 NZX33B,133 meets industry standards.
7.What is the process for return or replacement of NZX33B,133?
All NZX33B,133 units undergo pre-shipment inspection (PSI). If there is an issue with NZX33B,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 NZX33B,133 part is unused and in its original packaging.
Return procedure for NZX33B,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NZX33B,133 Tags
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