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Nexperia USA Inc. PDZ4.3B-QZ
- Part No.:
- PDZ4.3B-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ4.3B-QZ.pdf
- Description:
- DIODE ZENER 4.3V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,232
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Product details
Overview
PDZ4.3B-Q from Nexperia is a single Zener diode in SOD323 (SC-76) package, rated for 4.17 V to 4.48 V nominal Zener voltage at IZ = 5 mA, with ±2 % tolerance, 600 Ω dynamic impedance at 1 mA, and 3 μA reverse leakage at VR = 4.3 V. It delivers stable voltage regulation in low-power automotive and industrial circuits requiring compact, AEC-Q101-qualified components.
For engineers reviewing the PDZ4.3B-Q datasheet, PDZ4.3B-Q pinout, PDZ4.3B-Q application, or PDZ4.3B-Q equivalent, this device is selected for precision low-current reference, overvoltage clamping in sensor interfaces, and ESD-protected bias networks where thermal resistance (Rth(j-a) = 340 K/W) and hard breakdown knee behavior are critical.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a temperature coefficient of −2.5 mV/K at IZ = 5 mA, enabling predictable drift compensation in ambient ranges up to +150 °C junction temperature. Its hard breakdown knee and low leakage (≤3 μA at VR = 4.3 V) support stable regulation under light-load conditions typical in microcontroller reset circuits and analog front-end references.
The device is qualified per AEC-Q101 and mounted on FR4 PCB with single-sided copper, delivering 400 mW total power dissipation at Tamb ≤ 25 °C and derating linearly above that point. Thermal resistance from junction to ambient is 340 K/W, and junction-to-solder-point resistance is 130 K/W - key parameters for thermal design in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.17 V to 4.48 V at IZ = 5 mA - defines precise clamping threshold for 4.3 V nominal rail protection |
| Dynamic Impedance rdif | 600 Ω at IZ = 1 mA - ensures minimal voltage shift under varying load current in reference applications |
| Reverse Leakage IR | ≤3 μA at VR = 4.3 V - enables low-quiescent-current operation in battery-backed systems |
| Power Dissipation Ptot | 400 mW at Tamb = 25 °C - supports continuous operation in thermally constrained SMD layouts |
| Thermal Resistance Rth(j-a) | 340 K/W - determines maximum allowable ambient temperature rise before junction exceeds 150 °C |
| Temperature Coefficient SZ | −2.5 mV/K at IZ = 5 mA - allows predictable voltage drift compensation across automotive temperature range |
| Forward Voltage VF | 0.9 V at IF = 10 mA - defines conduction loss when used bidirectionally or in series with other protection devices |
Pinout & Package
PDZ4.3B-Q uses the SOD323 (SC-76) surface-mount plastic package: 1.35 mm × 0.8 mm body, 0.45 mm height, cathode marked by a bar on the top surface. The package is optimized for reflow soldering with standard footprint per Figure 9 in the datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; polarity must be observed for correct Zener breakdown orientation |
| 2 (A) | Anode | Connected to ground or lower-potential reference; forms reverse-bias path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including high-temperature operating life and humidity robustness |
| Hard breakdown knee | Sharp, well-defined Zener transition enables accurate voltage clamping without soft saturation effects |
| Low leakage current | ≤3 μA at 4.3 V reverse bias minimizes standby power loss in always-on monitoring circuits |
| Small SOD323 footprint | 1.35 mm × 0.8 mm area saves PCB space in dense automotive ECUs and portable industrial sensors |
| ±2 % voltage tolerance | Tight initial accuracy reduces need for post-production trimming in precision reference designs |
Applications
| Automotive Sensor Biasing | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Providing stable 4.3 V reference to analog sensor signal conditioning stages in engine control units. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, maintaining constant bias point despite supply ripple and temperature variation. Use Value: Enables <1 % full-scale error in 12-bit ADC readings by stabilizing op-amp reference voltage under 40–125 °C ambient conditions. |
Use Scenario: Generating clean reset signal for ARM Cortex-M microcontrollers during cold start and brown-out events. IC Role / Device Role / Timing Role: Functions as threshold detector in RC-based reset generator, triggering reset when VCC drops below 4.3 V. Use Value: Guarantees deterministic reset assertion with <50 μs response time due to hard breakdown knee and low capacitance (350 pF). |
| ESD-Protected IO Clamping | Low-Power Reference Divider |
|
Use Scenario: Protecting CAN transceiver inputs against transient overvoltage while preserving signal integrity. IC Role / Device Role / Timing Role: Shunt clamp placed between IO line and ground, conducting only above 4.3 V to divert ESD energy. Use Value: Limits peak voltage to ≤4.8 V during 8 kV HBM ESD events without degrading data rate or adding jitter. |
Use Scenario: Creating a precision 2.15 V mid-rail reference from 4.3 V supply using matched resistor divider. IC Role / Device Role / Timing Role: Supplies stable Zener voltage to high-impedance divider node, minimizing loading error. Use Value: Achieves <0.5 % mid-rail accuracy over temperature due to matched TC and low dynamic impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | Same 4.3 V nominal Zener voltage but ±5 % tolerance and higher dynamic impedance (90 Ω @ 5 mA vs. 600 Ω @ 1 mA) | Higher leakage (≤10 μA) and no AEC-Q101 qualification limits use to non-automotive consumer designs | Select for cost-sensitive non-automotive applications where tighter voltage tolerance is not required |
| MMSZ4V3T1G | 4.3 V nominal with ±5 % tolerance, 100 Ω dynamic impedance at 5 mA, and 100 nA leakage at 1 V | Lacks AEC-Q101 qualification and has lower Ptot (350 mW), limiting use in high-temperature automotive environments | Prefer for ultra-low-leakage applications below 100 °C ambient where long-term stability outweighs automotive compliance |
Compared with BZX84-C4V3 and MMSZ4V3T1G, PDZ4.3B-Q offers tighter voltage tolerance (±2 %), AEC-Q101 qualification, and superior thermal performance (400 mW rating, 340 K/W Rth(j-a)), making it the only choice for automotive-grade 4.3 V reference and clamping where reliability and precision are jointly mandated.
Availability
PDZ4.3B-Q is available at Aetrix Electronics and suitable for automotive sensor biasing, microcontroller reset generation, and ESD-protected IO clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PDZ4.3B-Q 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 components and advanced packaging technologies.
The PDZ-B-Q series targets automotive and industrial voltage regulation needs, delivering AEC-Q101-compliant Zener diodes with tight tolerances, hard breakdown characteristics, and optimized thermal performance in miniature SOD323 packages.
FAQ
What is the maximum continuous reverse current the PDZ4.3B-Q can handle?
The PDZ4.3B-Q is not rated for continuous reverse current; it operates in Zener breakdown mode with specified test current IZ = 5 mA. Its absolute maximum non-repetitive peak reverse current is 8.0 A for tp = 100 μs, but continuous operation must stay within Ptot = 400 mW derating limits - corresponding to ~93 mA at VZ ≈ 4.3 V at 25 °C ambient.
Does the PDZ4.3B-Q require a series current-limiting resistor in all applications?
Yes - a series resistor is mandatory to limit reverse current and prevent thermal runaway. For example, at VIN = 12 V and target IZ = 5 mA, a 1.54 kΩ resistor sets safe operating point; resistor value must be recalculated based on worst-case VIN, VZ tolerance, and ambient temperature derating.
How does the −2.5 mV/K temperature coefficient affect circuit performance?
The negative temperature coefficient means VZ decreases by 2.5 mV per Kelvin rise in junction temperature. At 125 °C junction (vs. 25 °C), VZ drops ~250 mV - a 5.8 % shift from nominal 4.3 V. This must be accounted for in precision references, though it enables partial cancellation when paired with positively drifting components.
Can PDZ4.3B-Q be used in bidirectional ESD protection configurations?
No - PDZ4.3B-Q is a unidirectional Zener diode with defined anode/cathode polarity. For bidirectional protection, two devices must be connected anode-to-anode or a dedicated bidirectional TVS like PESD5V0S1BA should be used; misapplication risks forward conduction or insufficient clamping in one polarity.
PDZ4.3B-QZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
PDZ4.3B-QZ FAQ
1.How can I place an order for PDZ4.3B-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ4.3B-QZ 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-QZ reliable?
The price and inventory of PDZ4.3B-QZ 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-QZ is usually 5 days.
3.What payment methods are accepted for PDZ4.3B-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ4.3B-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ4.3B-QZ?
PDZ4.3B-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ4.3B-QZ 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-QZ?
For technical support, including PDZ4.3B-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ4.3B-QZ requirements.
6.How does Aetrix verify that PDZ4.3B-QZ is sourced from the original manufacturer or authorized distributors?
All PDZ4.3B-QZ 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-QZ meets industry standards.
7.What is the process for return or replacement of PDZ4.3B-QZ?
All PDZ4.3B-QZ units undergo pre-shipment inspection (PSI). If there is an issue with PDZ4.3B-QZ, 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-QZ part is unused and in its original packaging.
Return procedure for PDZ4.3B-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ4.3B-QZ Tags
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