STMicroelectronics TS4041DIZ-1.2

Overview

TS4041DIZ-1.2 from STMicroelectronics is a 1% precision, ultra-low-power shunt voltage reference delivering a stable 1.225 V output over −40°C to +85°C, with 150 ppm/°C max temperature coefficient, 65 µA max operating current at 25°C, and 0.25–0.5 Ω static impedance-used in battery-operated instrumentation and SMPS feedback loops.

For engineers reviewing the TS4041DIZ-1.2 datasheet, TS4041DIZ-1.2 pinout, TS4041DIZ-1.2 application, or TS4041DIZ-1.2 equivalent, key selection criteria include initial accuracy (±1%), low-current stability down to 65 µA, capacitive-load tolerance, industrial temperature range compliance, and TO92 package compatibility for legacy through-hole designs.

Technical Context

The TS4041DIZ-1.2 operates as a two-terminal shunt reference, sinking cathode current to regulate voltage across its terminals. Its design relies on bandgap-derived Zener-like breakdown at 1.225 V, with internal trimming enabling ±1% initial tolerance at 25°C and guaranteed drift ≤150 ppm/°C over full temperature range.

It maintains regulation with load currents from 40 µA to 12 mA, exhibits <2.5 mV output shift across 1 mA–12 mA cathode current range, and delivers <200 nV/√Hz wideband noise (10 Hz–10 kHz), supporting high-resolution ADC biasing and precision analog sensing.

Key Specifications

Pinout & Package

TS4041DIZ-1.2 uses a 3-pin TO92 plastic package (order code Z), with cathode (pin 1), anode (pin 2), and case (pin 3) configuration. Pin 3 is internally connected to the cathode and serves as mechanical ground reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACZ and MAX6012AESA+, TS4041DIZ-1.2 uniquely combines 1.225 V native output, TO92 through-hole compatibility, and sub-100 µA operation-making it optimal for cost-sensitive, serviceable, or legacy-compatible low-power analog systems.

Availability

TS4041DIZ-1.2 is available at Aetrix Electronics and suitable for battery-operated instrumentation, switch-mode power supply feedback networks, and computer peripheral voltage monitoring requiring stable component supply with long-term availability and through-hole assembly support.

Supply support for TS4041DIZ-1.2 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The TS4041 series belongs to ST's precision analog reference product line, engineered specifically for space-constrained, low-power, and high-stability applications where shunt topology offers superior simplicity and robustness versus series references.

FAQ

What is the minimum cathode current required for regulation at −40°C?

At −40°C, the TS4041DIZ-1.2 requires a minimum cathode current of 70 µA to maintain regulation within specification. This is higher than the 40–65 µA range at 25°C due to increased bandgap-related leakage and process variation at cold extremes. Designers must ensure the external bias network sustains ≥70 µA across the full temperature range.

Can TS4041DIZ-1.2 drive a 100 µF ceramic capacitor directly without oscillation?

Yes-the TS4041DIZ-1.2 is explicitly characterized for stability with 0 µF to 100 µF capacitive loads, including ceramic types. Its internal compensation and low output impedance (0.25–0.5 Ω) prevent peaking or ringing, eliminating need for series resistance or external compensation in SMPS feedback paths.

How does the 150 ppm/°C temperature coefficient translate to voltage error at +85°C?

Over −40°C to +85°C (125°C span), a 150 ppm/°C coefficient yields a maximum drift of 125 × 150 = 18,750 ppm, or ±18.75 mV from 1.225 V-equivalent to ±1.53%. This is additive to the ±1% initial tolerance, resulting in a total worst-case output deviation of ±2.53% at temperature extremes.

Is pin 3 (case) electrically isolated or connected internally?

Pin 3 (case) is internally bonded to pin 1 (cathode) in the TO92 package. It is not isolated and must be treated as a second cathode terminal-used for mechanical mounting and thermal dissipation. Connecting pin 3 to system ground while leaving pin 1 floating will disrupt regulation and must be avoided.