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Nexperia USA Inc. PDZ20BF
- Part No.:
- PDZ20BF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ20BF.pdf
- Description:
- DIODE ZENER 20V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
PDZ20BF from Nexperia is a single silicon Zener diode designed for low-power voltage regulation in compact SMD applications, with a nominal Zener voltage of 20 V (19.52–20.39 V at IZ = 5 mA), ±2 % tolerance, 100 Ω maximum differential resistance at 5 mA, and 0.05 μA maximum reverse leakage at 15 V. It operates within −65 °C to +150 °C junction temperature range and delivers stable reference performance in power supply feedback paths and overvoltage protection circuits.
For engineers reviewing the PDZ20BF datasheet, PDZ20BF pinout, PDZ20BF application, or PDZ20BF equivalent, this device is selected for precision low-current voltage clamping, biasing, and reference generation where SOD323 footprint, thermal resistance under 340 K/W, and hard breakdown knee behavior are critical design requirements.
Technical Context
The PDZ20BF functions as a two-terminal voltage reference diode operating in reverse breakdown mode, with a specified Zener voltage defined at 5 mA test current and characterized across 25 °C to 150 °C. Its temperature coefficient is +16.4 mV/K at 5 mA, indicating positive drift - a key factor when used in temperature-sensitive reference networks.
It exhibits a hard breakdown knee and low dynamic impedance (100 Ω max at 5 mA), enabling stable regulation even under light load conditions. The device is rated for 400 mW total power dissipation on FR4 PCB with standard SOD323 footprint, and supports non-repetitive surge currents up to 1.5 A (100 µs pulse).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.52–20.39 V at IZ = 5 mA - defines precise clamping threshold for 20 V nominal regulation |
| Differential Resistance (rdif) | ≤100 Ω at IZ = 5 mA - ensures minimal output voltage shift under varying load current |
| Reverse Leakage (IR) | ≤0.05 μA at VR = 15 V - enables ultra-low quiescent current in battery-backed or high-impedance bias networks |
| Power Dissipation (Ptot) | 400 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Thermal Resistance (Rth(j-a)) | 340 K/W - determines junction-to-ambient temperature rise per watt, critical for thermal margin in sealed enclosures |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - defines conduction loss when used in forward-biased protection or logic-level clamping |
| Temperature Coefficient (SZ) | +16.4 mV/K at IZ = 5 mA - quantifies voltage drift per degree, essential for stability in wide-temperature industrial environments |
Pinout & Package
PDZ20BF is housed in a SOD323 (SC-76) surface-mount plastic package measuring 1.8 × 1.35 × 0.95 mm, with cathode indicated by a marking bar on the top surface. The package is optimized for reflow and wave soldering using standardized footprints per Nexperia's recommended land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node or voltage reference point; polarity must be observed to ensure reverse-bias operation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; forms the return path during Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Hard breakdown knee | Enables sharp, predictable turn-on at VZ, reducing ambiguity in clamping threshold selection |
| Low dynamic impedance | 100 Ω max at 5 mA ensures <10 mV output variation for ±1 mA load current change |
| Ultra-low leakage | 0.05 μA max at 15 V supports use in high-impedance sample-and-hold or battery-monitoring circuits |
| SOD323 footprint | 1.8 × 1.35 mm outline allows dense placement in space-constrained consumer and IoT PCBs |
| ±2 % voltage tolerance | Reduces need for post-production trimming in factory-calibrated voltage references |
Applications
| Power Supply Feedback Loop | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Stabilizing output voltage in isolated flyback or buck converter feedback networks using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Zener diode provides precise 20 V reference to bias TL431 or similar shunt regulator, setting secondary-side regulation threshold. Use Value: Tight 19.52–20.39 V tolerance and low rdif minimize output voltage drift across line/load/temperature variations. |
Use Scenario: Protecting microcontroller I/O pins or ADC inputs against transient overvoltage events exceeding 20 V. IC Role / Device Role / Timing Role: Acts as passive clamp between signal line and ground, conducting only when voltage exceeds Zener breakdown threshold. Use Value: Hard breakdown knee and 1.5 A non-repetitive surge rating enable reliable clamping without latch-up or thermal runaway. |
| Bias Voltage Reference | Temperature-Compensated Reference Node |
|
Use Scenario: Generating stable bias points for op-amp input stages or transistor base drive in analog sensor interfaces. IC Role / Device Role / Timing Role: Provides low-noise, low-drift DC reference voltage independent of supply rail fluctuations. Use Value: 0.05 μA leakage and 100 Ω dynamic impedance maintain accuracy in high-impedance (>1 MΩ) bias networks. |
Use Scenario: Compensating thermistor-based temperature sensing circuits where reference voltage drift must track sensor sensitivity. IC Role / Device Role / Timing Role: Supplies a +16.4 mV/K drifting reference that offsets negative thermistor coefficients in linearization networks. Use Value: Positive temperature coefficient matches common NTC thermistor compensation requirements without external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B20 | Same 20 V nominal, ±2 %, but higher rdif (150 Ω max), higher leakage (0.1 μA), SOD323 package | Less suitable for low-current precision references due to higher impedance and leakage | Select when cost priority outweighs tight regulation or ultra-low leakage needs |
| MMSZ5248B | 20 V nominal, ±5 % tolerance, 250 Ω rdif, 0.1 μA leakage, SOD123 package (larger footprint) | Lower accuracy and higher thermal resistance limit use in miniaturized or high-stability designs | Choose only if board layout permits SOD123 and ±5 % tolerance is acceptable |
Compared with BZX384-B20 and MMSZ5248B, PDZ20BF offers superior regulation stability (tighter tolerance, lower rdif, lower leakage) in the smallest SOD323 footprint - making it optimal for space-constrained, high-accuracy voltage reference and clamping roles.
Availability
PDZ20BF is available at Aetrix Electronics and suitable for power supply feedback loops, overvoltage protection clamps, and precision bias reference circuits requiring stable component supply and guaranteed long-term sourcing.
Supply support for PDZ20BF 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.
PDZ20BF belongs to the PDZ-B series of low-power Zener diodes engineered for general-purpose voltage regulation in consumer, industrial, and computing applications where small size, tight tolerance, and stable thermal behavior are essential.
FAQ
What is the maximum continuous reverse current the PDZ20BF can sustain at 25 °C ambient?
The PDZ20BF has no specified maximum continuous reverse (Zener) current; its limiting factor is power dissipation. At 25 °C ambient and 20 V Zener voltage, the maximum sustainable DC Zener current is 20 mA (400 mW ÷ 20 V). Derating applies above 25 °C per the published power derating curve.
Can PDZ20BF be used in series or parallel configurations for higher voltage or current capability?
Series connection is feasible for higher voltage clamping but requires matched units to avoid uneven voltage distribution; parallel use is not recommended due to manufacturing spread in Zener voltage and thermal runaway risk. For higher current, a series resistor must be sized to limit power dissipation within 400 mW.
How does the +16.4 mV/K temperature coefficient affect circuit performance?
The positive temperature coefficient means VZ increases ~16.4 mV per °C rise in junction temperature. In precision references, this drift must be compensated - e.g., by pairing with a negative-coefficient component or using in temperature-stable environments below 60 °C ambient.
Is PDZ20BF suitable for automotive applications?
No - PDZ20BF is not AEC-Q200 qualified and lacks automotive-specific testing or qualification. Nexperia explicitly states non-automotive qualified products are unsuitable for safety-critical or life-support systems; automotive use requires explicit AEC-Q200-rated alternatives like PZU20B2.
PDZ20BF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
PDZ20BF FAQ
1.How can I place an order for PDZ20BF through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ20BF 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 PDZ20BF reliable?
The price and inventory of PDZ20BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ20BF is usually 5 days.
3.What payment methods are accepted for PDZ20BF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ20BF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ20BF?
PDZ20BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ20BF 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 PDZ20BF?
For technical support, including PDZ20BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ20BF requirements.
6.How does Aetrix verify that PDZ20BF is sourced from the original manufacturer or authorized distributors?
All PDZ20BF 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 PDZ20BF meets industry standards.
7.What is the process for return or replacement of PDZ20BF?
All PDZ20BF units undergo pre-shipment inspection (PSI). If there is an issue with PDZ20BF, 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 PDZ20BF part is unused and in its original packaging.
Return procedure for PDZ20BF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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