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Nexperia USA Inc. PDZ4.3B,135
- Part No.:
- PDZ4.3B,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ4.3B,135.pdf
- Description:
- DIODE ZENER 4.3V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
PDZ4.3B,135 from Nexperia is a single silicon Zener diode optimized for low-power voltage regulation in space-constrained SMD designs, with nominal Zener voltage 4.3 V (4.17–4.48 V at IZ = 5 mA), ±2 % tolerance, 600 Ω dynamic impedance at 1 mA, and 3 µA reverse leakage at VR = 4.3 V. It operates within −65 °C to +150 °C and delivers stable clamping in power supply feedback paths and reference circuits.
For engineers reviewing the PDZ4.3B,135 datasheet, PDZ4.3B,135 pinout, PDZ4.3B,135 application, or PDZ4.3B,135 equivalent, this device is selected for precision low-current voltage reference, overvoltage protection in microcontroller I/O rails, and biasing of analog front-ends where thermal stability and hard breakdown knee are critical.
Technical Context
The PDZ4.3B,135 implements a planar epitaxial Zener structure with a temperature coefficient of −2.5 mV/K at IZ = 5 mA, enabling predictable drift compensation in ambient-temperature-varying circuits. Its hard breakdown knee and low leakage (<3 µA at rated VR) support clean regulation without soft turn-on artifacts.
Thermal resistance from junction to solder point is 130 K/W, and total power dissipation is rated at 400 mW at Tamb ≤ 25 °C on FR4 PCB - derating linearly above 25 °C per Fig. 1. Forward voltage is 0.9 V at 10 mA, confirming low-loss conduction in bidirectional clamp configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.17–4.48 V at IZ = 5 mA - defines precise clamping threshold for 3.3 V/5 V rail monitoring |
| Dynamic Impedance rdiff | 600 Ω at IZ = 1 mA - ensures minimal voltage shift under light-load transients |
| Reverse Leakage IR | ≤3 µA at VR = 4.3 V - prevents parasitic current draw in battery-backed circuits |
| Power Dissipation Ptot | 400 mW at Tamb = 25 °C - supports continuous operation in compact PCB footprints |
| Thermal Resistance Rth(j-sp) | 130 K/W - enables direct thermal coupling to copper pour for localized heat management |
| Forward Voltage VF | 0.9 V at IF = 10 mA - confirms low forward loss in dual-direction ESD clamp topologies |
| Temperature Coefficient SZ | −2.5 mV/K at IZ = 5 mA - allows predictable offset correction in temperature-compensated references |
Pinout & Package
PDZ4.3B,135 is housed in a SOD323 (SC-76) surface-mount plastic package measuring 1.35 mm × 0.8 mm × 0.45 mm, with cathode identified by a marking bar on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; polarity-sensitive for correct Zener conduction direction |
| 2 (A) | Anode | Tied to ground or lower-potential rail; completes reverse-bias path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hard breakdown knee | Enables sharp, repeatable turn-on without soft saturation - critical for accurate overvoltage detection |
| Low dynamic impedance at low current | 600 Ω @ 1 mA ensures <1 mV/mA load regulation error in microampere-biased references |
| ±2 % Zener voltage tolerance | Reduces need for post-production trimming in factory-calibrated sensor signal chains |
| 130 K/W junction-to-solder-point thermal resistance | Permits direct thermal anchoring to PCB copper for reliable operation up to 125 °C ambient |
| Marking bar cathode identification | Eliminates orientation errors during automated placement - verified via optical inspection |
Applications
| Power Supply Feedback Regulation | Microcontroller I/O Rail Protection |
|---|---|
Use Scenario: Stabilizing output voltage in low-power DC-DC converter feedback loops using TL431-like topology. IC Role / Device Role / Timing Role: Zener reference element setting precise feedback threshold for error amplifier comparison. Use Value: Tight 4.3 V tolerance and −2.5 mV/K TC enable <±1.5 % output accuracy across −40 °C to +85 °C. |
Use Scenario: Clamping 3.3 V GPIO lines against ESD and transient overvoltage events. IC Role / Device Role / Timing Role: Bidirectional shunt protector placed between I/O pin and ground. Use Value: 3 µA leakage preserves sleep-mode current budget; 0.9 V forward drop limits positive excursion during fast transients. |
| Analog Sensor Bias Reference | Low-Power Voltage Monitor Circuit |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors in portable instrumentation. IC Role / Device Role / Timing Role: Low-current Zener reference sourcing <100 µA into sensor bias network. Use Value: 600 Ω dynamic impedance maintains <0.1 % reference stability despite sensor loading variations. |
Use Scenario: Detecting brown-out conditions on 5 V system rails using comparator input threshold. IC Role / Device Role / Timing Role: Precision voltage divider tap defining trip point for reset controller. Use Value: ±2 % tolerance eliminates need for external calibration; hard knee ensures consistent trigger timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B4V3 | Same 4.3 V nominal, but ±5 % tolerance and 1000 Ω rdiff @ 5 mA | Higher leakage (5 µA) and softer knee reduce accuracy in precision references | Acceptable for non-critical clamping where cost is prioritized over regulation tightness |
| MMSZ4685 | 4.3 V nominal, ±5 %, 1000 Ω rdiff, 5 µA IR, SOD-123 package (larger footprint) | Larger thermal resistance (250 K/W) limits power handling in dense layouts | Suitable when board real estate allows larger package and tighter thermal margin is not required |
Compared with BZX384-B4V3 and MMSZ4685, PDZ4.3B,135 delivers superior voltage accuracy, lower dynamic impedance, and smaller thermal resistance - making it optimal for high-density, thermally constrained, and precision-biased applications where regulation fidelity directly impacts system performance.
Availability
PDZ4.3B,135 is available at Aetrix Electronics and suitable for power supply feedback regulation, microcontroller I/O rail protection, and analog sensor bias reference requiring stable component supply across industrial control, portable instrumentation, and embedded IoT designs.
Supply support for PDZ4.3B,135 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 specializing in high-volume, high-reliability discrete and logic devices, with manufacturing rooted in process control and automotive-grade quality systems.
The PDZ-B series targets general-purpose, low-power Zener regulation in consumer, industrial, and computing applications - designed for manufacturability, consistency, and compatibility with standard SMT assembly processes.
FAQ
What is the maximum continuous reverse current the PDZ4.3B,135 can handle before thermal runaway?
The PDZ4.3B,135 has an absolute maximum non-repetitive peak reverse current IZSM of 8.0 A for 100 µs pulses, but its continuous safe operating limit is governed by power dissipation: at 25 °C ambient, max IZ = 400 mW / 4.3 V ≈ 93 mA. Derating applies above 25 °C per the 130 K/W junction-to-solder thermal resistance.
Does the PDZ4.3B,135 meet RoHS and REACH compliance requirements?
Yes - PDZ4.3B,135 is manufactured by Nexperia in full compliance with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free terminations and halogen-free molding compound confirmed in the official product declaration.
Can PDZ4.3B,135 be used in series or parallel configurations for higher voltage or current capability?
Series connection is viable for higher Zener voltage (e.g., two PDZ4.3B,135 yield ~8.6 V), but requires matched units to avoid current imbalance. Parallel use is not recommended due to negative temperature coefficient mismatch causing thermal runaway - individual devices must be isolated with series resistors if combined.
How does the −2.5 mV/K temperature coefficient affect long-term reference stability in a 0–70 °C operating range?
Over 70 °C span, the Zener voltage shifts by −2.5 mV/K × 70 K = −175 mV, or −4.1 % of nominal 4.3 V. For applications demanding better than ±2 % stability, external compensation (e.g., series NTC resistor) or selection of higher-VZ devices with positive TC crossover is required.
PDZ4.3B,135 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):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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
PDZ4.3B,135 FAQ
1.How can I place an order for PDZ4.3B,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ4.3B,135 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 PDZ4.3B,135 reliable?
The price and inventory of PDZ4.3B,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ4.3B,135 is usually 5 days.
3.What payment methods are accepted for PDZ4.3B,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ4.3B,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ4.3B,135?
PDZ4.3B,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ4.3B,135 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 PDZ4.3B,135?
For technical support, including PDZ4.3B,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ4.3B,135 requirements.
6.How does Aetrix verify that PDZ4.3B,135 is sourced from the original manufacturer or authorized distributors?
All PDZ4.3B,135 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 PDZ4.3B,135 meets industry standards.
7.What is the process for return or replacement of PDZ4.3B,135?
All PDZ4.3B,135 units undergo pre-shipment inspection (PSI). If there is an issue with PDZ4.3B,135, 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 PDZ4.3B,135 part is unused and in its original packaging.
Return procedure for PDZ4.3B,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ4.3B,135 Tags
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