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Nexperia USA Inc. PDZ18BF
- Part No.:
- PDZ18BF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ18BF.pdf
- Description:
- DIODE ZENER 18V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
PDZ18BF from Nexperia is a single silicon Zener diode designed for low-power voltage regulation in surface-mounted applications, with a nominal Zener voltage of 18 V at 5 mA, ±2 % tolerance, 80 Ω maximum differential resistance at 5 mA, and 0.05 μA maximum reverse current at 13 V. It operates in the SOD323 (SC-76) package and is used for precision reference and overvoltage clamping in power supply feedback paths.
For engineers reviewing the PDZ18BF datasheet, PDZ18BF pinout, PDZ18BF application, or PDZ18BF equivalent, key selection criteria include Zener voltage accuracy at low test current (IZ = 5 mA), thermal coefficient (14.4 mV/K), junction-to-solder-point thermal resistance (130 K/W), and compatibility with reflow/wave soldering footprints per IPC-7351.
Technical Context
This device functions as a two-terminal voltage reference where reverse-biased operation establishes a stable breakdown voltage. Its hard breakdown knee and low leakage (≤0.05 μA at VR = 13 V) support stable regulation under light-load conditions typical in bias networks and sensor excitation circuits.
The PDZ18BF exhibits a positive temperature coefficient of +14.4 mV/K at IZ = 5 mA, enabling predictable drift compensation in multi-diode reference strings. Its 130 K/W junction-to-solder-point thermal resistance reflects optimized thermal path design for FR4 PCBs with standard single-sided copper footprints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.56 V to 18.35 V at IZ = 5 mA - defines regulation setpoint with ±2.2 % total tolerance including temp and unit variation |
| Differential Resistance (rdif) | ≤80 Ω at IZ = 5 mA - ensures <100 mV output shift for ±1 mA load change in reference applications |
| Reverse Current (IR) | ≤0.05 μA at VR = 13 V - enables ultra-low quiescent current in battery-backed or energy-harvesting circuits |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - supports use as polarity protection or low-drop rectifier in dual-role designs |
| Power Dissipation (Ptot) | 400 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous regulation power before thermal derating begins |
| Thermal Resistance (Rth(j-sp)) | 130 K/W - determines junction temperature rise above solder point; critical for reliability in compact layouts |
| Temperature Coefficient (SZ) | +14.4 mV/K at IZ = 5 mA - quantifies voltage drift per degree; used for ambient-compensated reference design |
Pinout & Package
The PDZ18BF is housed in a SOD323 (SC-76) plastic surface-mount package measuring 1.8 mm × 1.35 mm × 0.95 mm, with cathode indicated by a marking bar on the top surface. The package is optimized for automated placement and reflow soldering per IPC-7351 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; reverse-bias terminal where Zener breakdown occurs |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes bias path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 80 Ω max at 5 mA enables tight voltage regulation under varying load currents |
| Hard breakdown knee | Sharp, non-gradual transition into conduction improves regulation stability near VZ |
| Ultra-low leakage | 0.05 μA max at 13 V supports high-impedance bias networks without signal corruption |
| Small footprint | SOD323 package (1.8 × 1.35 mm) saves board space in dense portable and IoT designs |
| Controlled temperature coefficient | +14.4 mV/K allows predictable drift modeling for compensated reference circuits |
Applications
| Power Supply Feedback Loop | Overvoltage Clamp Protection |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-boost converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Zener diode provides precise reference voltage for TL431 or similar shunt regulator ICs in secondary-side feedback networks. Use Value: ±2 % VZ tolerance and low rdif ensure <±1.5 % output voltage accuracy across line/load/temperature. |
Use Scenario: Protecting microcontroller I/O pins or analog front-end inputs from transient overvoltage events. IC Role / Device Role / Timing Role: Clamps input voltage to 18 V by conducting excess current when input exceeds VZ, diverting surge away from sensitive circuitry. Use Value: 0.05 μA leakage preserves high-impedance input integrity; 80 Ω rdif limits clamping voltage overshoot during fast transients. |
| Reference Voltage Source | Bias Network Stabilization |
|
Use Scenario: Generating stable 18 V reference for ADC reference buffers, DAC output stages, or comparator thresholds. IC Role / Device Role / Timing Role: Provides fixed DC reference node decoupled from supply rail variations via series resistor and local bypass. Use Value: +14.4 mV/K temperature coefficient enables predictable drift compensation when paired with NTC thermistors or complementary diodes. |
Use Scenario: Setting bias points for RF amplifier transistors or op-amp input stages requiring stable DC operating points. IC Role / Device Role / Timing Role: Maintains constant gate/base voltage despite supply ripple or thermal drift in discrete amplifier designs. Use Value: Hard breakdown knee prevents gradual conduction onset, ensuring sharp turn-on and consistent bias voltage under varying thermal conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B18 | Same 18 V nominal VZ, but ±5 % tolerance and higher rdif (100 Ω); SOD323 package | Lower accuracy and poorer regulation stability limit use to non-critical clamping only | Select when cost sensitivity outweighs regulation precision requirements |
| MMSZ4689 | 18 V nominal VZ, ±5 % tolerance, 100 Ω rdif, 500 mW Ptot; SOD123 package | Larger footprint and looser tolerance reduce suitability for space-constrained precision references | Prefer when higher power handling (500 mW) is required and board area permits SOD123 |
Compared with BZX384-B18 and MMSZ4689, the PDZ18BF delivers tighter voltage tolerance (±2 % vs. ±5 %), lower dynamic impedance (80 Ω vs. ≥100 Ω), and smaller SOD323 footprint-making it optimal for high-accuracy, space-constrained regulation where thermal resistance (130 K/W) and leakage (0.05 μA) are critical.
Availability
PDZ18BF is available at Aetrix Electronics and suitable for power supply feedback loops, overvoltage clamp protection, and reference voltage source applications requiring stable component supply, traceable sourcing, and long-term lifecycle continuity.
Supply support for PDZ18BF 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 delivering high-performance logic, discrete, and MOSFET devices with focus on efficiency, reliability, and miniaturization for consumer, industrial, and automotive markets.
The PDZ-B series targets low-power voltage regulation and clamping in space-constrained SMD designs, emphasizing tight Zener tolerance, low leakage, and robust thermal performance on standard FR4 PCBs.
FAQ
What is the maximum reverse current specification for PDZ18BF at 13 V?
The PDZ18BF specifies a maximum reverse current (IR) of 0.05 μA at VR = 13 V and Tj = 25 °C. This ultra-low leakage supports high-impedance bias networks and minimizes standby power loss in battery-powered systems.
How does the temperature coefficient affect PDZ18BF's regulation accuracy over temperature?
With a specified temperature coefficient of +14.4 mV/K at IZ = 5 mA, the PDZ18BF's Zener voltage increases by approximately 14.4 mV per Kelvin rise in junction temperature. Over a 100 °C range, this yields ~1.44 V drift-requiring compensation in precision references.
Can PDZ18BF be used in place of a 1N4746A in a through-hole design?
No-PDZ18BF uses an SOD323 surface-mount package and is not mechanically or thermally interchangeable with the axial-lead 1N4746A (DO-41). While both have ~18 V VZ, differences in package thermal resistance (130 K/W vs. ~100 K/W), mounting method, and test conditions preclude direct substitution without layout and thermal redesign.
What is the recommended soldering profile for PDZ18BF's SOD323 package?
The PDZ18BF follows standard reflow profiles for plastic SMD packages: peak temperature ≤260 °C, time above 217 °C ≤60 seconds, and ramp rate ≤3 °C/s. Footprint dimensions match IPC-7351 SOD323 land patterns, with 0.5 mm pad width and 0.6 mm spacing per Nexperia's Fig. 9.
PDZ18BF 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):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13 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
PDZ18BF FAQ
1.How can I place an order for PDZ18BF through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ18BF 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 PDZ18BF reliable?
The price and inventory of PDZ18BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ18BF is usually 5 days.
3.What payment methods are accepted for PDZ18BF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ18BF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ18BF?
PDZ18BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ18BF 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 PDZ18BF?
For technical support, including PDZ18BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ18BF requirements.
6.How does Aetrix verify that PDZ18BF is sourced from the original manufacturer or authorized distributors?
All PDZ18BF 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 PDZ18BF meets industry standards.
7.What is the process for return or replacement of PDZ18BF?
All PDZ18BF units undergo pre-shipment inspection (PSI). If there is an issue with PDZ18BF, 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 PDZ18BF part is unused and in its original packaging.
Return procedure for PDZ18BF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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