Nexperia USA Inc. PLVA2668A,215

Overview

PLVA2668A from Nexperia is a low-voltage avalanche regulator double diode with common anode configuration in SOT23 package, designed for precision voltage stabilization at 6.8 V nominal working voltage (IZ = 250 μA), 100 Ω dynamic resistance, and 3.4 mV/K temperature coefficient. It delivers low-noise performance (1.0 μV/√Hz) and supports CMOS RAM backup, smoke detector relays, and low-power voltage limiting circuits.

For engineers reviewing the PLVA2668A datasheet, PLVA2668A pinout, PLVA2668A application, or PLVA2668A equivalent, key selection criteria include its dual-cathode/common-anode topology, 6.6–7.0 V VZ tolerance at 250 μA, sub-10 nA reverse current at 80% VZ, hard breakdown knee, and 250 mW total power dissipation capability.

Technical Context

This device integrates two matched Zener-type avalanche diodes sharing a single anode terminal, enabling compact dual-rail voltage reference or bidirectional clamping in space-constrained designs. Its low dynamic impedance (100 Ω) and tight VZ tolerance (±0.2 V) ensure stable regulation under microampere-level load currents.

The diode exhibits hard breakdown characteristics and low noise density (1.0 μV/√Hz), making it suitable for sensitive analog monitoring paths. Its thermal coefficient (3.4 mV/K) and low IR (0.006 μA at 90% VZ) support stable operation across industrial temperature ranges without external compensation.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (TO-236AB); 3-lead, small outline transistor format with gull-wing leads. Dimensions: 2.8 mm × 1.4 mm × 1.1 mm (L × W × H), pitch 1.9 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C6V8 and MMBZ5237B, PLVA2668A uniquely provides dual matched avalanche diodes in one SOT23 package with common anode-reducing component count, improving thermal tracking, and enabling compact dual-reference or bidirectional clamp topologies not possible with single-diode alternatives.

Availability

PLVA2668A is available at Aetrix Electronics and suitable for CMOS RAM backup circuits, smoke detector relay control, and low-power analog reference designs requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for PLVA2668A 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 leader in high-performance discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, consumer, and wearable markets with robust, scalable components.

The PLVA2600A series belongs to Nexperia's low-voltage avalanche regulator diode product line, engineered specifically for ultra-low-noise, low-current voltage stabilization in battery-sensitive and space-constrained applications.

FAQ

What is the maximum continuous power dissipation for PLVA2668A when both diodes are active?

When both diodes are simultaneously loaded, PLVA2668A has a maximum total power dissipation of 180 mW at Tamb = 25 °C on FR4 PCB. This derates linearly with ambient temperature using R_{th j-a} = 500 K/W, reaching zero dissipation at approximately 131 °C junction temperature.

Can PLVA2668A be used as a bidirectional ESD clamp?

No-PLVA2668A is a unidirectional avalanche regulator with cathodes referenced to a common anode. It conducts only in reverse bias (cathode-to-anode). For bidirectional clamping, external series diodes or dedicated TVS arrays are required.

How does the 3.4 mV/K temperature coefficient affect long-term voltage accuracy?

Over a −40 °C to +85 °C range, the 3.4 mV/K coefficient causes ~425 mV total V_Z drift. In practice, this translates to ±212.5 mV deviation from nominal 6.8 V, or ±3.1% full-scale error-acceptable for non-precision biasing but insufficient for metrology-grade references without compensation.

Is the PLVA2668A RoHS compliant and halogen-free?

Yes-Nexperia confirms PLVA2668A meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The SOT23 package uses lead-free matte tin termination and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL1).