Diodes Incorporated ZR40401F25TC

Overview

ZR40401F25TC from Diodes Incorporated is a precision 2.5 V micropower shunt voltage reference IC in SOT-23 package, featuring 1% initial tolerance, 30 ppm/°C typical temperature coefficient, and stable operation from 60 µA to 15 mA. It requires no external capacitor, supports capacitive loads, and delivers fast transient response (<10 µs) for battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZR40401F25TC datasheet, ZR40401F25TC pinout, ZR40401F25TC application, or ZR40401F25TC equivalent, key selection criteria include low operating current range (60 µA–15 mA), tight 1% voltage tolerance, TC performance across –40°C to +85°C, and SOT-23 footprint compatibility with space-constrained PCB layouts.

Technical Context

The ZR40401F25TC implements a bandgap-based shunt reference architecture, operating as a two-terminal device with cathode and anode terminals. Its internal design ensures stability without external compensation and maintains regulation under capacitive loading up to 10 nF.

It achieves thermal stability via curvature-compensated bandgap core, delivering 30 ppm/°C typical TC over –40°C to +85°C and 0.4 Ω typical slope resistance. Transient recovery settles within 10 µs at 150 µA load current, enabling use in dynamic power monitoring and ADC reference circuits.

Key Specifications

Pinout & Package

SOT-23 package (JEDEC MO-178AA), 3-pin surface-mount, with pin 1 floating or internally connected to pin 2 per Diodes Inc. datasheet revision. Cathode (pin 1 or 2) and anode (pin 3) configuration supports standard shunt reference biasing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Compared with TLVH431ACDBVR and REF3025AIDBZR, the ZR40401F25TC offers optimal trade-off of 1% tolerance, ultra-low 60 µA start-up, and true two-terminal simplicity-making it preferred for compact, battery-critical shunt reference designs where external components and layout space are constrained.

Availability

ZR40401F25TC is available at Aetrix Electronics and suitable for battery-powered portable meters, precision data acquisition systems, and industrial process monitoring transmitters requiring stable component supply with consistent parametric performance across production lots.

Supply support for ZR40401F25TC 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The ZR4040 series belongs to Diodes' precision analog portfolio, engineered specifically for cost-sensitive, space-constrained applications demanding stable voltage references without external compensation components.

FAQ

Is ZR40401F25TC a shunt or series voltage reference?

ZR40401F25TC is a two-terminal shunt voltage reference. It operates by sinking current through its cathode-anode path to maintain a stable 2.5 V across the device, requiring only an external series resistor for biasing. This differs from three-terminal series references that regulate output between separate input, output, and ground pins.

What is the maximum capacitive load the ZR40401F25TC can drive without instability?

The ZR40401F25TC is specified as stable with capacitive loads up to 10 nF, as confirmed in Diodes Incorporated's ZR4040-2.5 datasheet (Issue 4, January 2003, Figure 4-175). No external compensation capacitor is required, and stability is maintained across the full –40°C to +85°C temperature range and 60 µA–15 mA operating current.

Can ZR40401F25TC replace ZR40402F25 in a design?

Yes, ZR40401F25TC can directly replace ZR40402F25 (2% tolerance version) on the same SOT-23 footprint, provided the application requires tighter 1% initial voltage accuracy. Both share identical pinout, electrical characteristics except tolerance, thermal behavior, and packaging - no layout or schematic changes are needed for upgrade.

Does ZR40401F25TC require derating at elevated temperatures?

Yes - power dissipation must be derated above +25°C ambient. The SOT-23 package has a thermal resistance of 375°C/W, and maximum power is 330 mW at 25°C. At +85°C ambient, allowable power drops to ~198 mW (330 mW × [1 − (85−25)/375]), limiting max reverse current to ~79 mA at 2.5 V - well above the 15 mA recommended operating limit.