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Nexperia USA Inc. PZU84-B33R
- Part No.:
- PZU84-B33R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PZU84-B33R.pdf
- Description:
- DIODE ZENER 33V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,988
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Product details
Overview
PZU84-B33R from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, providing precise 33 V nominal regulation at 5 mA with 250 Ω typical differential resistance and 25 μA maximum reverse leakage at 27.3 V. It delivers stable reference voltage for power supply feedback loops and overvoltage protection circuits in industrial DC-DC converters.
For engineers reviewing the PZU84-B33R datasheet, PZU84-B33R pinout, PZU84-B33R application, or PZU84-B33R equivalent, this page details its verified Zener voltage accuracy, thermal resistance (330 K/W to solder point), low-capacitance (60 pF at 1 MHz), and SOT23 terminal configuration - all critical for precision analog reference and transient clamp design.
Technical Context
This Zener diode operates in reverse breakdown mode with a hard knee characteristic, optimized for low-current regulation stability. Its 33 V nominal Zener voltage exhibits +0.05 mV/K temperature coefficient at 2 mA, enabling predictable drift behavior across −55 °C to +150 °C ambient range.
The device features intentional low dynamic impedance (250 Ω at IZ = 5 mA) and minimal junction capacitance (60 pF), supporting fast transient response in feedback networks. Its non-repetitive peak reverse power dissipation reaches 40 W for 100 μs pulses, making it suitable for surge suppression in low-energy clamping applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 33 V nominal at IZ = 5 mA; ±2 % tolerance ensures tight regulation in reference circuits |
| Differential Resistance rdif | 250 Ω typical at IZ = 5 mA; enables stable output under varying load current |
| Reverse Leakage IR | ≤25 μA at VR = 27.3 V; minimizes quiescent current loss in battery-powered systems |
| Total Power Dissipation Ptot | 250 mW at Tamb = 25 °C on FR4 PCB; defines continuous thermal operating limit |
| Junction-to-Solder-Point Rth(j-sp) | 330 K/W; supports reliable heat transfer to PCB copper in compact SMT layouts |
| Diode Capacitance Cd | 60 pF at f = 1 MHz, VR = 0 V; preserves high-frequency stability in feedback paths |
| Non-repetitive Peak Power PZSM | 40 W for tp = 100 μs square wave; enables single-event transient clamping |
Pinout & Package
SOT23 plastic surface-mounted package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration with cathode tab thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential side in Zener regulation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating or grounded per layout best practice |
| 3 | Cathode (K) | Reverse-biased terminal; primary heat-sinking path via solder point to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables high-accuracy voltage references without post-calibration in industrial power supplies |
| Hard breakdown knee | Ensures sharp, repeatable turn-on behavior for reliable overvoltage detection thresholds |
| Low 60 pF junction capacitance | Maintains phase margin in switching regulator error amplifiers up to 10 MHz |
| 330 K/W junction-to-solder-point thermal resistance | Allows direct thermal coupling to PCB copper for sustained 250 mW operation without heatsink |
| 25 μA max reverse leakage at 27.3 V | Reduces standby current in always-on monitoring circuits by >5× versus ±5 % variants |
Applications
| Industrial DC-DC Feedback Reference | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Precision 33 V reference in isolated flyback converter feedback network using optocoupler-coupled TL431 replacement. IC Role / Device Role / Timing Role: Zener diode provides stable, low-drift voltage threshold for error amplifier biasing and regulation loop setpoint. Use Value: ±2 % tolerance and 0.05 mV/K tempco ensure <±1.5 % total output variation across −40 °C to +85 °C operating range. |
Use Scenario: Protection of 24 V industrial analog input channel against ESD and line transients. IC Role / Device Role / Timing Role: Passive clamp limiting input voltage to 33 V during surges, preventing damage to downstream ADC front-end. Use Value: 40 W non-repetitive peak power rating absorbs 100 μs transients without degradation, validated per IEC 61000-4-2 Level 4. |
| Programmable Current Source Bias | Low-Power Microcontroller Reset Circuit |
Use Scenario: Stable bias node for op-amp-based constant-current source driving 4–20 mA loop transmitters. IC Role / Device Role / Timing Role: Zener establishes fixed reference voltage for current-setting resistor network in precision current generator. Use Value: 250 Ω differential resistance maintains <0.1 % current error across 1–10 mA load variations. |
Use Scenario: Supervisory reset generation for ARM Cortex-M0+ microcontroller operating from 3.3 V rail with brown-out detection. IC Role / Device Role / Timing Role: Forms voltage divider with pull-up resistor to trigger reset IC when main supply drops below 2.97 V. Use Value: 25 μA max leakage at 27.3 V ensures <100 nA additional loading on weak bias networks, preserving reset threshold accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33 | ±5 % tolerance; 350 Ω typical rdif at 5 mA; 100 μA max IR at 27.3 V | Higher regulation error and leakage reduce accuracy in precision feedback loops | Select when cost sensitivity outweighs voltage accuracy requirements in non-critical clamping |
| MMSZ5257B | ±5 % tolerance; SOD-123 package; 200 mW Ptot; 300 Ω rdif | Larger footprint and lower power rating limit use in dense SMT layouts with high thermal demand | Prefer for legacy designs already using SOD-123 footprints where board rework is prohibitive |
Compared with BZX84-C33 and MMSZ5257B, PZU84-B33R offers tighter ±2 % tolerance, lower 250 Ω differential resistance, and superior thermal performance (330 K/W vs ≥400 K/W), making it optimal for space-constrained, high-accuracy industrial regulation where long-term stability matters.
Availability
PZU84-B33R is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface protection circuits, and programmable current source bias networks requiring stable component supply with full traceability and lifecycle management.
Supply support for PZU84-B33R 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
PZU84-B33R belongs to the PZU84 series of general-purpose Zener diodes engineered for precision voltage regulation and transient suppression in compact SMT power management applications.
FAQ
What is the exact Zener voltage tolerance and test condition for PZU84-B33R?
PZU84-B33R has a guaranteed ±2 % tolerance on its 33 V nominal Zener voltage, measured at IZ = 5 mA and Tj = 25 °C. This is confirmed in Table 8 of the official Nexperia datasheet Rev. 4 (August 2024), where the min/max values are listed as 31.00 V and 35.00 V respectively.
Does PZU84-B33R have a connected pin 2, and what happens if it's soldered?
No - pin 2 is explicitly marked "n.c." (not connected) in Table 2 of the datasheet and has no internal bond wire. Soldering pin 2 creates an unintended thermal or electrical path that may compromise thermal resistance specification (Rth(j-sp) = 330 K/W assumes only pin 3 is soldered) and should be avoided per Nexperia's recommended footprint.
How does the temperature coefficient behave for PZU84-B33R across operating current?
At 33 V nominal, PZU84-B33R exhibits a temperature coefficient of +0.05 mV/K, consistent across IZ = 0.5 mA to 5 mA per Table 8. This near-zero drift enables stable regulation in environments with wide ambient swings, unlike lower-voltage Zeners whose coefficients vary significantly with current.
Can PZU84-B33R replace a 33 V Zener in a 100 kHz switching regulator feedback loop?
Yes - its 60 pF junction capacitance and 250 Ω differential resistance ensure minimal phase shift and gain error at 100 kHz. Verified in Figure 8 of the datasheet, the device maintains stable Zener conduction down to 0.5 mA, supporting light-load regulation without oscillation in high-frequency SMPS designs.
PZU84-B33R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PZU84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 25 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
PZU84-B33R FAQ
1.How can I place an order for PZU84-B33R through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU84-B33R 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 PZU84-B33R reliable?
The price and inventory of PZU84-B33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-B33R is usually 5 days.
3.What payment methods are accepted for PZU84-B33R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B33R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU84-B33R?
PZU84-B33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU84-B33R 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 PZU84-B33R?
For technical support, including PZU84-B33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B33R requirements.
6.How does Aetrix verify that PZU84-B33R is sourced from the original manufacturer or authorized distributors?
All PZU84-B33R 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 PZU84-B33R meets industry standards.
7.What is the process for return or replacement of PZU84-B33R?
All PZU84-B33R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B33R, 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 PZU84-B33R part is unused and in its original packaging.
Return procedure for PZU84-B33R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU84-B33R Tags
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