My Inquiry
My Account
Nexperia USA Inc. PZU84-B39R
- Part No.:
- PZU84-B39R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PZU84-B39R.pdf
- Description:
- DIODE ZENER 39V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,591
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PZU84-B39R from Nexperia is a general-purpose Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and overvoltage protection in low-power analog and digital circuits. It delivers a nominal 39 V Zener voltage with ±2 % tolerance, 350 Ω differential resistance at 2 mA, and 27.3 mV/K temperature coefficient - enabling stable regulation in industrial sensor interfaces and power supply feedback loops.
For engineers reviewing the PZU84-B39R datasheet, PZU84-B39R pinout, PZU84-B39R application, or PZU84-B39R equivalent, key selection criteria include its 39 V nominal breakdown voltage, low leakage current (≤0.05 μA at VR = 31.2 V), hard breakdown knee, and compatibility with standard SOT23 reflow footprints per IPC-7351.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain a stable reference voltage across its cathode–anode terminals. Its design emphasizes low dynamic impedance (350 Ω typical at IZ = 2 mA) and tightly controlled temperature coefficient (27.3 mV/K) to minimize drift under varying load and ambient conditions.
The device features a hard breakdown knee and very low leakage current (<0.05 μA at VR = 31.2 V), distinguishing it from the -C series variants optimized for switching noise reduction. It is rated for 250 mW steady-state dissipation on FR4 PCB and withstands 40 W non-repetitive surge pulses (tp = 100 μs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, ±2 % tolerance - ensures precise clamping at 38.2–39.8 V under 2 mA test current |
| Differential Resistance (rdif) | 350 Ω max at IZ = 2 mA - maintains tight regulation despite load current variation |
| Temperature Coefficient (SZ) | 27.3 mV/K - quantifies voltage drift per degree Celsius rise in junction temperature |
| Reverse Current (IR) | ≤0.05 μA at VR = 31.2 V - enables ultra-low standby power in battery-backed circuits |
| Total Power Dissipation (Ptot) | 250 mW at Tamb = 25 °C on standard FR4 - defines maximum continuous DC power handling |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - supports transient overvoltage suppression without failure |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - allows use as low-drop rectifier or polarity indicator in dual-function designs |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), optimized for automated assembly and thermal performance on FR4 PCBs with single-sided 70 μm copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during regulation or conduction |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or solder joint required |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node to enable Zener breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables high-accuracy voltage references without post-production trimming in 39 V systems |
| Hard breakdown knee | Ensures sharp, predictable turn-on behavior critical for precision clamping and threshold detection |
| Very low leakage current | Supports microamp-level standby operation in always-on monitoring circuits and energy-harvesting nodes |
| Low differential resistance | Minimizes output voltage deviation under dynamic load changes in feedback networks and reference buffers |
| SOT23 footprint compatibility | Allows drop-in replacement in existing designs using industry-standard 0805-equivalent land patterns |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Feedback |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 24-bit delta-sigma ADCs in temperature transmitters operating from 24 V loop supplies. IC Role / Device Role / Timing Role: Zener diode provides fixed 39 V reference to bias op-amp gain stages and set ADC full-scale range. Use Value: ±2 % VZ tolerance and 27.3 mV/K SZ ensure <0.1 % full-scale error over −40 °C to +85 °C ambient. |
Use Scenario: Overvoltage clamp in USB-C PD sink controller feedback path protecting 3.3 V logic from accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Reverse-biased Zener shunts excess voltage above 39 V to ground before it reaches downstream regulators. Use Value: 40 W non-repetitive surge rating absorbs 100 μs transients without degradation, preserving system reliability. |
| Programmable Logic Controller Input Protection | Medical Instrument Reference Divider |
|
Use Scenario: Protecting 24 V digital input channels against field-wiring surges and ESD events in factory automation I/O modules. IC Role / Device Role / Timing Role: Acts as primary overvoltage limiter upstream of TVS diodes and series current-limiting resistors. Use Value: Hard breakdown knee ensures clamping initiates precisely at 39 V, preventing false triggering of downstream comparators. |
Use Scenario: Generating a stable 3.9 V sub-reference via 10:1 resistive divider from 39 V rail in portable ECG front-end amplifiers. IC Role / Device Role / Timing Role: Supplies low-noise, low-drift voltage source for precision instrumentation amplifier biasing. Use Value: 350 Ω rdif minimizes divider ratio error caused by load current draw, maintaining <0.05 % scaling 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-C39 | ±5 % tolerance, 500 Ω rdif at 5 mA, higher IR (≤10 μA at VR = 31.2 V) | Lower cost but reduced accuracy and stability; suitable for non-critical biasing | Select when budget constraints outweigh precision requirements and thermal drift is less critical |
| MMSZ5249B | ±5 % tolerance, 150 Ω rdif at 20 mA, higher Ptot (500 mW), TO-236AB package | Larger footprint and higher power capability; requires different PCB layout | Choose only if 500 mW dissipation or alternate thermal management is needed |
Compared with BZX84-C39 and MMSZ5249B, PZU84-B39R offers superior voltage accuracy (±2 % vs. ±5 %), lower leakage, and SOT23 compatibility - making it optimal for space-constrained, high-stability applications where regulation precision directly impacts measurement fidelity.
Availability
PZU84-B39R is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power delivery feedback, and PLC input protection requiring stable component supply with consistent parametric performance across production batches.
Supply support for PZU84-B39R 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 discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.
The PZU84 series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered specifically for stable voltage reference and overvoltage protection in space-constrained, thermally demanding industrial and consumer power systems.
FAQ
What is the maximum continuous reverse current the PZU84-B39R can handle without exceeding its power rating?
At Tamb = 25 °C on a standard FR4 PCB, the PZU84-B39R has a total power dissipation limit of 250 mW. With a nominal Zener voltage of 39 V, this corresponds to a maximum continuous reverse current of approximately 6.4 mA (250 mW ÷ 39 V). Derating is required above 25 °C per the 500 K/W junction-to-ambient thermal resistance.
Does the 'R' suffix in PZU84-B39R indicate RoHS compliance or a specific marking variant?
The 'R' suffix denotes tape-and-reel packaging per standard Nexperia ordering conventions - not RoHS status. All PZU84 series devices are RoHS-compliant and halogen-free per Nexperia's environmental policy. The marking code for PZU84-B39R is '%SQ', visible on the top surface of the SOT23 package.
Can PZU84-B39R be used in forward-bias applications such as LED driving or level shifting?
Yes - its forward voltage is specified at ≤0.9 V at 10 mA, making it usable as a low-VF clamp or polarity indicator. However, it is not optimized for sustained forward conduction: the absolute maximum forward current is 200 mA, and thermal resistance limits continuous forward power to ~180 mW at 25 °C ambient.
How does the PZU84-B39R differ electrically from the PZU84-C39 variant?
PZU84-B39R offers ±2 % voltage tolerance, very low leakage (<0.05 μA), and a hard breakdown knee - ideal for precision regulation. PZU84-C39 has ±5 % tolerance, higher leakage (~0.05 μA), and an intentionally modified structure for faster switching and lower noise, per Application Note AN90031.
PZU84-B39R 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):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 350 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-B39R FAQ
1.How can I place an order for PZU84-B39R through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU84-B39R 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-B39R reliable?
The price and inventory of PZU84-B39R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-B39R is usually 5 days.
3.What payment methods are accepted for PZU84-B39R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B39R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU84-B39R?
PZU84-B39R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU84-B39R 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-B39R?
For technical support, including PZU84-B39R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B39R requirements.
6.How does Aetrix verify that PZU84-B39R is sourced from the original manufacturer or authorized distributors?
All PZU84-B39R 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-B39R meets industry standards.
7.What is the process for return or replacement of PZU84-B39R?
All PZU84-B39R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B39R, 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-B39R part is unused and in its original packaging.
Return procedure for PZU84-B39R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU84-B39R Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
