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Nexperia USA Inc. PZU84-B4V7R
- Part No.:
- PZU84-B4V7R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PZU84-B4V7R.pdf
- Description:
- DIODE ZENER 4.7V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,655
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Product details
Overview
PZU84-B4V7R from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, providing precise 4.7 V regulation at 5 mA with 800 Ω differential resistance and 1.0 mV/K temperature coefficient. It delivers low leakage (≤2 μA at VR = 4.7 V), hard breakdown knee, and supports general-purpose voltage reference and overvoltage protection in space-constrained DC power rails.
For engineers reviewing the PZU84-B4V7R datasheet, PZU84-B4V7R pinout, PZU84-B4V7R application, or PZU84-B4V7R equivalent, this page details its Zener regulation behavior, thermal limits, SOT23 terminal mapping, and verified alternatives for 4.7 V reference design.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable 4.7 V across its cathode-anode terminals under regulated current conditions (IZ = 5 mA). Its hard breakdown knee ensures minimal voltage variation during transition into conduction, while low dynamic impedance (800 Ω typ.) sustains regulation accuracy under load transients.
Designed for ambient temperatures from −55 °C to +150 °C, it features Rth(j-a) = 500 K/W in free air and Rth(j-sp) = 330 K/W to solder point, enabling reliable operation in thermally constrained PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.7 V nominal at IZ = 5 mA; ±2 % tolerance ensures 4.61–4.79 V stability in production designs |
| Differential Resistance rdif | 800 Ω typical at IZ = 5 mA; defines small-signal AC impedance affecting regulation ripple rejection |
| Reverse Current IR | ≤2 μA max at VR = 4.7 V; enables low-power standby biasing without significant quiescent loss |
| Forward Voltage VF | ≤0.9 V at IF = 10 mA; supports bidirectional clamping when used with series resistor in protection circuits |
| Total Power Dissipation Ptot | 250 mW at Tamb = 25 °C on FR4 PCB; sets maximum continuous DC power handling in standard layout |
| Non-repetitive Peak Power PZSM | 40 W for tp = 100 μs; allows transient surge suppression of ESD or inductive kick without failure |
| Junction Temperature Tj | −55 °C to +150 °C operating range; supports industrial and automotive under-hood environments |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node in reverse-bias regulation; carries forward current during fault clamping |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad; no PCB trace or solder connection required |
| 3 | Cathode (K) | Connected to regulated output node; defines Zener breakdown polarity and voltage reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| Hard breakdown knee | Sharp, well-defined Zener turn-on at 4.7 V minimizes regulation hysteresis in feedback loops |
| Low leakage current | ≤2 μA at VR = 4.7 V reduces standby power draw in battery-backed or energy-harvesting systems |
| ±2 % voltage tolerance | Tighter than standard ±5 % variants, enabling higher-accuracy references without post-calibration |
| Optimized for low-current regulation | Specified performance at IZ = 5 mA supports microamp-level bias networks in sensor interfaces |
| SOT23 footprint compatibility | Standardized 3-pin layout enables drop-in replacement in existing PCBs designed for similar regulators |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Providing stable 4.7 V reference for ADC voltage dividers or op-amp biasing in industrial sensor nodes. IC Role / Device Role / Timing Role: Zener diode functions as shunt voltage reference, sinking excess current to hold output at precise 4.7 V. Use Value: ±2 % tolerance and 800 Ω rdif ensure <±10 mV drift over temperature and load, meeting 12-bit ADC reference accuracy requirements. |
Use Scenario: Clamping 5 V rail against transient spikes exceeding 5.5 V in USB-powered peripherals. IC Role / Device Role / Timing Role: Acts as passive crowbar device, conducting when rail exceeds 4.7 V + forward drop of series diode. Use Value: 40 W non-repetitive peak power rating absorbs 100 μs surges up to 10 A without degradation. |
| Signal Level Shifting | Microcontroller Reset Circuit |
Use Scenario: Translating 3.3 V logic signals to 4.7 V interface levels in mixed-voltage FPGA I/O banks. IC Role / Device Role / Timing Role: Used in series with current-limiting resistor to clamp high-side signal to 4.7 V while blocking reverse current. Use Value: ≤0.9 V forward voltage ensures clean low-to-high transitions; low capacitance (<325 pF) preserves signal edge integrity up to 10 MHz. |
Use Scenario: Generating clean reset pulse for ARM Cortex-M0+ MCU during 5 V supply ramp-up. IC Role / Device Role / Timing Role: Zener holds reset line low until VCC reaches 4.7 V, then releases reset via RC delay network. Use Value: Hard breakdown knee eliminates ambiguous reset window; ≤2 μA leakage prevents premature reset release in deep-sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V7 | ±5 % tolerance (4.47–4.94 V), 100 Ω rdif at 5 mA, 5 μA IR at VR = 4.7 V | Higher regulation spread and leakage reduce accuracy in precision analog circuits | Select when cost sensitivity outweighs 4.7 V accuracy; verify system margin accommodates wider VZ spread |
| MMSZ4700T1G | ±5 % tolerance, 100 Ω rdif at 20 mA, 1 μA IR at VR = 4.7 V, SOD-123 package | Larger SOD-123 footprint requires PCB redesign; optimized for higher test current, not low-IQ operation | Choose only if board space allows larger package and design uses ≥20 mA Zener current for lowest rdif |
Compared with PZU84-B4V7R, BZX84-C4V7 trades tighter tolerance for lower cost but increases reference uncertainty by 3×, while MMSZ4700T1G offers lower rdif only at higher current and incompatible packaging-neither matches the 4.7 V ±2 %/low-leakage/SOT23 combination for precision low-power regulation.
Availability
PZU84-B4V7R is available at Aetrix Electronics and suitable for industrial sensor calibration, USB peripheral overvoltage protection, and microcontroller reset circuitry requiring stable component supply with guaranteed long-term continuity.
Supply support for PZU84-B4V7R 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, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The PZU84 series belongs to Nexperia's general-purpose Zener regulator product line, engineered for accurate voltage referencing and robust transient suppression in compact SMT designs where size, consistency, and thermal resilience are critical.
FAQ
What is the maximum continuous Zener current for PZU84-B4V7R at 70 °C ambient?
At Tamb = 70 °C, derated power dissipation is 175 mW (based on 250 mW @ 25 °C and 500 K/W Rth(j-a)). With VZ = 4.7 V, maximum continuous IZ is 37.2 mA. Exceeding this risks junction overheating beyond 150 °C, triggering thermal runaway.
Can PZU84-B4V7R be used in series for higher voltage reference generation?
No-PZU84-B4V7R lacks matched characteristics for series stacking. Its ±2 % tolerance and variable temperature coefficient (1.0 mV/K) cause unpredictable cumulative error and thermal drift. Use dedicated multi-Zener ICs or resistor-divider + reference ICs instead.
Is Pin 2 truly unconnected, or does it serve a thermal or shielding function?
Pin 2 is electrically isolated with no internal connection per Nexperia's pinning diagram and package outline. It serves no thermal or shielding role-the die attach paddle connects only to Pin 3 (cathode). PCB layout must leave Pin 2 unconnected to avoid unintended shorts.
How does the "hard breakdown knee" improve performance versus standard Zeners?
The hard knee ensures rapid, monotonic transition from high-impedance off-state to low-impedance regulation at exactly 4.7 V, eliminating soft turn-on regions that cause hysteresis and noise in feedback paths. This yields cleaner regulation in analog control loops and stable reset thresholds.
PZU84-B4V7R 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):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 1 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-B4V7R FAQ
1.How can I place an order for PZU84-B4V7R through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU84-B4V7R 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-B4V7R reliable?
The price and inventory of PZU84-B4V7R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-B4V7R is usually 5 days.
3.What payment methods are accepted for PZU84-B4V7R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B4V7R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU84-B4V7R?
PZU84-B4V7R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU84-B4V7R 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-B4V7R?
For technical support, including PZU84-B4V7R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B4V7R requirements.
6.How does Aetrix verify that PZU84-B4V7R is sourced from the original manufacturer or authorized distributors?
All PZU84-B4V7R 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-B4V7R meets industry standards.
7.What is the process for return or replacement of PZU84-B4V7R?
All PZU84-B4V7R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B4V7R, 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-B4V7R part is unused and in its original packaging.
Return procedure for PZU84-B4V7R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU84-B4V7R Tags
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