Diodes Incorporated ZMV831BTC

Overview

ZMV831BTC from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators, with nominal capacitance of 15.0 pF at 2 V, capacitance ratio C₂/C₂₀ = 4.5, Q ≥ 300 at 50 MHz, and reverse leakage ≤ 200 pA - enabling low-phase-noise VCXO/TCXO designs in SOT23 surface-mount packages.

For engineers reviewing the ZMV831BTC datasheet, ZMV831BTC pinout, ZMV831BTC application, or ZMV831BTC equivalent, key selection criteria include hyperabrupt CV slope (300–400 ppm/°C tempco), 25 V reverse breakdown rating, SOT23 package compatibility with RF layout constraints, and verified performance in 900 MHz–2.4 GHz wireless front-end tuning circuits.

Technical Context

ZMV831BTC operates as a voltage-variable capacitor whose junction capacitance varies inversely with applied reverse bias, exhibiting a steep hyperabrupt doping profile to deliver high tuning sensitivity. Its CV curve is tightly controlled across production lots, ensuring predictable frequency pull range in oscillator loops.

The device maintains high Q (>300 at 50 MHz) up to 20 V reverse bias, minimizing insertion loss and phase noise degradation in resonant tank circuits. Low IR (typ. 200 pA at VR = 2 V) directly supports ultra-low-jitter clock generation in TCXOs and frequency synthesizers.

Key Specifications

Pinout & Package

Supplied in SOT23 package: 3-pin, single-anode/single-cathode configuration with cathode marked by band. Standard JEDEC MO-215 outline; body dimensions 2.67 × 1.20 × 1.10 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar varactor diode applications.

Compared with BBY52-02W and SMV1232-011, ZMV831BTC offers balanced trade-off between tuning ratio (4.5), low-leakage stability (200 pA), and 25 V robustness - making it preferred for industrial TCXOs where long-term drift and supply voltage margin are critical.

Availability

ZMV831BTC is available at Aetrix Electronics and suitable for VCXO design, TCXO compensation, wireless VCO tuning, and pager IF filtering requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for ZMV831BTC 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

Zetex Semiconductors plc was a UK-based ISO 9001/TS16949-certified designer and manufacturer of high-performance analog and RF semiconductors, acquired by Diodes Incorporated in 2008.

ZMV831BTC belongs to the 830-series hyperabrupt varactor family, engineered specifically for low-phase-noise frequency control in precision timing and wireless infrastructure applications.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum reverse voltage is 25 V, but for reliable long-term operation in TCXO/VCXO circuits, Zetex specifies 20 V as the maximum continuous reverse bias. Exceeding this risks accelerated parametric drift and increased leakage, particularly above 85°C ambient.

Does ZMV831BTC require derating at elevated temperatures?

Yes - capacitance decreases ~350 ppm/°C, and reverse leakage increases exponentially above 25°C. At 100°C, IR rises to ~2 nA, degrading phase noise; design must limit max junction temperature to ≤125°C using PCB copper pour and thermal vias under the SOT23 pad.

Can ZMV831BTC be used in dual-common-cathode configurations?

No - ZMV831BTC is a single-diode variant in SOT23. Dual configurations (e.g., ZMDC831BTA) use SOD323 packages with separate anodes and shared cathode; pinout and layout are incompatible with ZMV831BTC's 3-pin SOT23 footprint.

Is RoHS compliance documented for this part?

Yes - per Zetex's "Green Compliance" statement in Issue 11 (Jan 2007), all 830-series devices including ZMV831BTC meet EU RoHS Directive 2002/95/EC, with lead-free terminations and halogen-free molding compounds confirmed in manufacturing records.