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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. PLVA668A-QR

Name: PLVA668A-QR
Brand: Nexperia USA Inc.
SKU: PLVA668A-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PLVA668A-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: PLVA668A-QR.pdf

Description:: DIODE ZENER 6.8V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:9,424

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Product details

Overview

PLVA668A-QR from Nexperia is a low-voltage avalanche regulator diode in SOT23 (TO-236AB) package, designed for precision voltage stabilization at 6.80 V nominal Zener voltage with ±0.20 V tolerance at I_Z = 250 µA, 100 Ω dynamic resistance, and 0.8 nA reverse current at 50 % V_Z, targeting automotive-grade low-noise backup power circuits.

For engineers reviewing the PLVA668A-QR datasheet, PLVA668A-QR pinout, PLVA668A-QR application, or PLVA668A-QR equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (R_th(j-a) = 500 K/W), noise density (≤1.0 µV/√Hz), and exact pin mapping for design-in validation.

Technical Context

This device operates as a two-terminal shunt voltage reference using controlled avalanche breakdown in silicon, optimized for low-current regulation (10 µA to 1 mA range) with hard knee characteristics and minimal line regulation (≤0.1 V). Its 3.40 mV/K temperature coefficient and 1.0 µV/√Hz noise density support stable biasing in sensitive analog and memory retention circuits.

Designed for automotive environments, it meets AEC-Q101 stress requirements including T_j up to 150 °C, non-repetitive peak reverse power dissipation of 30 W (100 µs pulse), and total power dissipation limited to 250 mW at 25 °C ambient on FR4 PCB.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z (nominal)	6.80 V at I_Z = 250 µA - precise stabilization point for 6.8 V rail conditioning
V_Z tolerance	±0.20 V - ensures tight output voltage control in safety-critical automotive subsystems
R_Z	100 Ω at 1 kHz, I_ZAC = 10 % I_ZDC - low dynamic impedance enables stable regulation under varying load
I_R	0.8 nA at V_R = 50 % V_Z - ultra-low leakage preserves battery-backed CMOS RAM integrity
S_Z	3.40 mV/K - predictable thermal drift for compensated reference designs
V_n	≤1.0 µV/√Hz at f = 1 kHz - low noise supports high-SNR sensor biasing and analog front-ends
P_tot	250 mW max at T_amb = 25 °C - defines safe continuous power envelope on standard FR4 layout

Pinout & Package

PLVA668A-QR uses the SOT23 (TO-236AB) surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm footprint, and 0.45 mm lead pitch. Thermal resistance is 500 K/W (junction-to-ambient, free air) and 330 K/W (junction-to-solder point).

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward-biased terminal; connects to lower-potential node in shunt configuration
2	Not Connected (n.c.)	Internally isolated; must remain unconnected on PCB to avoid parasitic coupling
3	Cathode (K)	Reverse-biased terminal; ties to regulated voltage rail and provides reference output

Key Features

Feature	Design Value
Hard breakdown knee	Enables sharp, repeatable conduction onset at V_Z, critical for accurate overvoltage clamping
Low noise density	≤1.0 µV/√Hz - reduces interference in precision analog signal chains and sensor interfaces
AEC-Q101 qualification	Validated for automotive use per stress test standard, supporting under-hood and infotainment applications
Small V_Z tolerances	±0.20 V at 250 µA - eliminates need for post-production trimming in volume production
Low dynamic impedance	100 Ω - maintains regulation stability across 10 µA–1 mA operating range without external compensation

Applications

CMOS RAM Backup

Automotive Voltage Limiter

Use Scenario: Maintaining volatile SRAM state during engine start-stop cycles where main supply dips below 5 V.

IC Role / Device Role / Timing Role: Shunt voltage regulator providing stable 6.8 V reference to RAM V_CC pin during brownout.

Use Value: 0.8 nA reverse leakage prevents battery drain over multi-year vehicle service life.

Use Scenario: Protecting LIN bus transceiver inputs from transient overvoltage during load dump events.

IC Role / Device Role / Timing Role: Fast-response clamp limiting input voltage to ≤7.0 V before damage threshold.

Use Value: Hard breakdown knee and 30 W non-repetitive pulse rating absorb 100 µs transients without degradation.

Smoke Detector Power Rail

Low-Power Sensor Bias

Use Scenario: Stabilizing reference voltage for electrochemical CO sensor amplifier in battery-powered detectors.

IC Role / Device Role / Timing Role: Low-noise voltage reference supplying bias to op-amp input stage.

Use Value: 1.0 µV/√Hz noise density avoids masking weak sensor signals in sub-ppm detection ranges.

Use Scenario: Providing regulated bias to MEMS accelerometer analog front-end in ADAS ECU.

IC Role / Device Role / Timing Role: Precision shunt reference establishing 6.8 V common-mode level for differential ADC driver.

Use Value: 3.40 mV/K tempco allows predictable calibration offset correction across −40 °C to +125 °C.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-voltage shunt regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C6V8-Q	Higher R_Z (200 Ω typ), higher I_R (500 nA at 50 % V_Z), no AEC-Q101 certification	Limited to industrial/commercial grade; unsuitable for automotive safety-critical modules	Select when cost sensitivity outweighs automotive qualification and ultra-low leakage needs
PLZ6.8B-Q	Same V_Z but higher P_tot (365 mW), larger SOD-123 package, 250 Ω R_Z, 1.5 nA I_R	Better thermal handling for higher ambient, but incompatible with dense SOT23 layouts	Choose when board space permits larger footprint and higher continuous power is required

Compared with BZX84-C6V8-Q and PLZ6.8B-Q, PLVA668A-QR uniquely combines AEC-Q101 compliance, 0.8 nA leakage, and 100 Ω dynamic impedance in SOT23-enabling compact, low-power, automotive-qualified voltage stabilization where leakage, noise, and qualification are jointly constrained.

Availability

PLVA668A-QR is available at Aetrix Electronics and suitable for automotive infotainment systems, battery-backed memory modules, and smoke detector electronics requiring stable component supply with guaranteed long-term continuity.

Supply support for PLVA668A-QR 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 logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.

The PLVA6xxA-Q series belongs to Nexperia's automotive-qualified discrete voltage reference portfolio, engineered specifically for low-noise, low-leakage shunt regulation in safety-critical 12 V system nodes.

FAQ

What is the maximum junction temperature for continuous operation?

The PLVA668A-QR has a rated maximum junction temperature of 150 °C per IEC 60134 Absolute Maximum Ratings. Continuous operation at this limit requires thermal design ensuring R_th(j-a) ≤ 500 K/W, typically achieved via copper pour and solder pad area per Nexperia's SOT23 footprint guidelines.

Is PLVA668A-QR compatible with lead-free reflow soldering?

Yes-PLVA668A-QR is qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature tolerance up to 260 °C. The recommended reflow profile uses a 60-second time above liquidus (TAL) at 235–245 °C, matching standard SOT23-compatible profiles.

How does the 3.40 mV/K temperature coefficient affect long-term voltage accuracy?

At 3.40 mV/K, V_Z shifts by +0.34 V over a 100 K rise (−40 °C to +60 °C), resulting in ±0.34 V drift across that range. For applications needing tighter stability, this coefficient must be compensated in system-level calibration or paired with temperature-insensitive circuit topologies.

Can Pin 2 (n.c.) be grounded or left floating on the PCB?

Pin 2 is internally not connected and must remain unconnected on the PCB-neither grounded nor tied to any net. Routing traces or vias to this pad may introduce parasitic capacitance or leakage paths, degrading noise performance and reverse leakage specifications.

PLVA668A-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 6.8 V

Tolerance:: ±2.94%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 0.8 nA @ 3.4 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PLVA668A-QR FAQ

1.How can I place an order for PLVA668A-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for PLVA668A-QR 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 PLVA668A-QR reliable?

The price and inventory of PLVA668A-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PLVA668A-QR is usually 5 days.

3.What payment methods are accepted for PLVA668A-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PLVA668A-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PLVA668A-QR?

PLVA668A-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PLVA668A-QR 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 PLVA668A-QR?

For technical support, including PLVA668A-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PLVA668A-QR requirements.

6.How does Aetrix verify that PLVA668A-QR is sourced from the original manufacturer or authorized distributors?

All PLVA668A-QR 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 PLVA668A-QR meets industry standards.

7.What is the process for return or replacement of PLVA668A-QR?

All PLVA668A-QR units undergo pre-shipment inspection (PSI). If there is an issue with PLVA668A-QR, 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 PLVA668A-QR part is unused and in its original packaging.

Return procedure for PLVA668A-QR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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