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Nexperia USA Inc. PDZ33BF
- Part No.:
- PDZ33BF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ33BF.pdf
- Description:
- DIODE ZENER 33V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
PDZ33BF from Nexperia is a single silicon Zener diode designed for low-power voltage regulation in compact SMD applications, featuring a nominal Zener voltage of 33 V at 5 mA, ±2 % tolerance, 250 Ω maximum differential resistance at IZ = 5 mA, 0.05 μA maximum reverse leakage at VR = 25 V, and 400 mW total power dissipation on FR4 PCB. It operates in general-purpose clamping and reference circuits where space-constrained, stable breakdown behavior is required.
For engineers reviewing the PDZ33BF datasheet, PDZ33BF pinout, PDZ33BF application, or PDZ33BF equivalent, this device is selected for precision low-current voltage referencing, overvoltage protection in sensor interfaces, and biasing in portable analog front-ends - where cathode-anode polarity, thermal derating above 25 °C, and low-capacitance (60 pF at 1 MHz) are critical design considerations.
Technical Context
This Zener diode implements a planar silicon junction with hard breakdown knee and low dynamic impedance optimized for stable regulation at low test currents (IZ = 5 mA). Its temperature coefficient of +29.7 mV/K at IZ = 5 mA indicates positive drift, requiring compensation in high-stability references.
Thermal performance is defined by Rth(j-a) = 340 K/W on standard FR4 PCB, limiting continuous operation to ≤118 °C ambient at full 400 mW dissipation. Non-repetitive peak reverse current capability is 0.9 A for 100 µs pulses, supporting transient suppression in low-energy circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 32.15–33.79 V at IZ = 5 mA; ensures tight regulation window for 33 V nominal reference designs |
| Differential Resistance rdif | ≤250 Ω at IZ = 5 mA; minimizes output voltage shift under load variation |
| Reverse Leakage IR | ≤0.05 μA at VR = 25 V; enables ultra-low quiescent current in battery-powered bias networks |
| Forward Voltage VF | ≤0.9 V at IF = 10 mA; supports efficient forward conduction in dual-direction clamp configurations |
| Thermal Resistance Rth(j-a) | 340 K/W on FR4 PCB; defines maximum ambient temperature before junction exceeds 150 °C at rated Ptot |
| Capacitance Cd | 60 pF at f = 1 MHz, VR = 0 V; preserves signal integrity in RF-adjacent or high-speed analog monitoring paths |
| Non-repetitive Peak Current IZSM | 0.9 A for tp = 100 µs; provides limited surge immunity without external series limiting |
Pinout & Package
PDZ33BF is housed in a SOD323 (SC-76) surface-mount plastic package measuring 1.8 × 1.35 × 0.95 mm, with cathode identified by a marking bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; accepts reverse-biased Zener current during regulation |
| 2 | Anode (A) | Connected to circuit ground or lower-potential rail; completes reverse-bias path for breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 250 Ω max at 5 mA enables <1 % output deviation across ±1 mA load changes |
| Hard breakdown knee | Sharp transition into conduction reduces ambiguity in regulation onset for precision threshold detection |
| Low leakage current | 0.05 μA max at 25 V supports >10-year battery life in always-on sensor biasing |
| Small SOD323 footprint | 1.8 × 1.35 mm outline allows placement in dense layout areas near IC power pins or feedback nodes |
| ±2 % voltage tolerance | Tighter than standard E24 range parts, reducing need for post-production trimming in production calibration |
Applications
| Power Supply Rail Clamp | Sensor Bias Reference |
|---|---|
|
Use Scenario: Clamping 3.3 V or 5 V logic rails against ESD or inductive kickback in industrial I/O modules. IC Role / Device Role / Timing Role: Zener acts as shunt overvoltage protector, diverting transient energy to ground before IC input damage occurs. Use Value: 60 pF capacitance avoids signal distortion on 10 MHz digital lines; 0.9 A peak current rating handles IEC 61000-4-2 Level 3 surges without external TVS. |
Use Scenario: Providing stable 33 V bias to photodiode transimpedance amplifiers in optical smoke detectors. IC Role / Device Role / Timing Role: Functions as low-drift voltage reference for op-amp feedback network, setting photocurrent-to-voltage gain. Use Value: +29.7 mV/K tempco is compensated via resistor network; 0.05 μA leakage prevents offset error >10 nA in picoampere-range sensing. |
| ADC Reference Stabilizer | Microcontroller Reset Supervisor |
|
Use Scenario: Stabilizing internal reference voltage for 12-bit SAR ADCs in portable data loggers powered by Li-ion cells. IC Role / Device Role / Timing Role: Zener supplies clean, low-noise reference to ADC REF+ pin, decoupled with 100 nF ceramic capacitor. Use Value: 250 Ω rdif limits reference droop to <0.25 mV under 1 mA ADC reference current, preserving ENOB >11.5 bits. |
Use Scenario: Generating precise 33 V threshold for external reset supervisor IC monitoring 3.3 V system supply. IC Role / Device Role / Timing Role: Supplies regulated voltage to comparator input of reset generator, enabling accurate brown-out detection. Use Value: ±2 % tolerance ensures reset assertion within ±0.66 V of nominal, meeting JEDEC JESD8-12A margin requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B33 | Same 33 V nominal, ±2 %, but higher rdif (350 Ω), higher leakage (0.1 μA), SOD323 package | Less stable under varying load; unsuitable for sub-μA bias networks | Select when cost sensitivity outweighs regulation precision and leakage constraints |
| MMSZ4689 | 33 V nominal, ±5 % tolerance, 400 Ω rdif, 0.1 μA leakage, SOD123 package (larger footprint) | Loose tolerance requires calibration; larger size limits routing density | Choose only if legacy board layout mandates SOD123 or qualification requires ON Semiconductor sourcing |
Compared with BZX384-B33 and MMSZ4689, PDZ33BF delivers superior regulation stability (250 Ω vs ≥350 Ω rdif) and lowest leakage (0.05 μA), making it optimal for high-accuracy, low-power analog subsystems where board space and long-term drift matter.
Availability
PDZ33BF is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical monitors, and automotive body-control modules requiring stable component supply with guaranteed long-term continuity.
Supply support for PDZ33BF 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 headquartered in Nijmegen, Netherlands, specializing in high-volume, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.
PDZ33BF belongs to the PDZ-B series of low-power Zener diodes engineered for precision voltage regulation in space-constrained SMD designs, emphasizing tight tolerance, low leakage, and consistent breakdown characteristics.
FAQ
What is the maximum continuous power dissipation for PDZ33BF on a standard FR4 PCB?
PDZ33BF has a maximum total power dissipation (Ptot) of 400 mW at Tamb ≤ 25 °C when mounted on an FR4 PCB with single-sided copper, tin-plated, and standard SOD323 footprint. Power must be derated linearly above 25 °C using the 340 K/W thermal resistance value, reaching zero dissipation at approximately 118 °C ambient.
How does the temperature coefficient affect PDZ33BF's regulation accuracy over temperature?
PDZ33BF exhibits a positive temperature coefficient of +29.7 mV/K at IZ = 5 mA, meaning its Zener voltage increases ~30 mV per degree Celsius rise. Over a 0–70 °C operating range, this introduces up to 2.1 V drift, requiring either compensation circuitry or use in applications where absolute voltage stability is secondary to relative clamping behavior.
Can PDZ33BF be used in place of a 33 V TVS diode for ESD protection?
No - PDZ33BF is not rated for ESD or surge events per IEC 61000-4-2. While it can handle 0.9 A non-repetitive peaks for 100 µs, its 400 mW power limit and lack of specified clamping voltage under fast transients make it unsuitable as a primary ESD suppressor. Use dedicated TVS diodes like PESD3V3L1BA for compliant protection.
What is the significance of the 'F' suffix in PDZ33BF?
The 'F' suffix denotes Nexperia's standard RoHS-compliant, halogen-free, lead-free finish with matte tin plating on the SOD323 terminations. It confirms compliance with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life and standard reflow profiles without baking.
PDZ33BF 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):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 25 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
PDZ33BF FAQ
1.How can I place an order for PDZ33BF through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ33BF 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 PDZ33BF reliable?
The price and inventory of PDZ33BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ33BF is usually 5 days.
3.What payment methods are accepted for PDZ33BF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ33BF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ33BF?
PDZ33BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ33BF 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 PDZ33BF?
For technical support, including PDZ33BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ33BF requirements.
6.How does Aetrix verify that PDZ33BF is sourced from the original manufacturer or authorized distributors?
All PDZ33BF 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 PDZ33BF meets industry standards.
7.What is the process for return or replacement of PDZ33BF?
All PDZ33BF units undergo pre-shipment inspection (PSI). If there is an issue with PDZ33BF, 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 PDZ33BF part is unused and in its original packaging.
Return procedure for PDZ33BF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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