Analog Devices Inc./Maxim Integrated MAX6008BESA+

Overview

MAX6008BESA+ from Maxim Integrated is a precision 2.5V two-terminal shunt voltage reference in an 8-pin SO package, featuring 0.5% initial accuracy, 75ppm/°C temperature coefficient, <1µA minimum operating current, and operation over -40°C to +85°C. It serves as a low-power, high-stability reference for ADC/DAC biasing, portable metering, and battery-powered precision regulators.

For engineers reviewing the MAX6008BESA+ datasheet, MAX6008BESA+ pinout, MAX6008BESA+ application, or MAX6008BESA+ equivalent, key selection criteria include guaranteed sub-1µA startup current, 2.5V output tolerance under load and temperature variation, SO-package thermal performance (θJA = 136°C/W), and compatibility with 0.01µF output bypassing for noise-sensitive signal chains.

Technical Context

The MAX6008BESA+ implements a laser-trimmed series bandgap core with on-chip thin-film resistors, delivering stable 2.5V reverse breakdown at 1.2µA test current. Its two-terminal architecture requires external bias resistor (RBIAS) to set total current (IRMIN + IL), with IRMIN ≥ 1.0µA to maintain <0.2% voltage deviation.

It exhibits 2.0mV reverse breakdown change across 200µA–2mA current range, 2Ω reverse dynamic impedance (1.2µA–2mA), and 60µV_P-P low-frequency noise (0.1Hz–10Hz), enabling use in high-resolution data acquisition where reference drift and noise directly impact ENOB.

Key Specifications

Pinout & Package

MAX6008BESA+ uses an 8-pin SO package (package code S8+2, outline 21-0041) with thermal resistance θJA = 136°C/W on multilayer board. Pin 1 is OUT, Pin 4 is GND; Pins 1,2,3,5,7 are NC except Pin 6 and Pin 8 tied internally to OUT per datasheet pin description.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040C25IDBZR and LT1004CZ-2.5, MAX6008BESA+ offers superior thermal performance (136°C/W vs. >200°C/W), tighter TC (75ppm/°C vs. ≥100ppm/°C), and guaranteed <1µA operation-critical for modern low-power, surface-mount precision systems.

Availability

MAX6008BESA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable meters, and precision ADC reference applications requiring stable component supply, RoHS compliance, and long-lifecycle support.

Supply support for MAX6008BESA+ 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications systems.

The MAX6006–MAX6009 family delivers ultra-low-power, high-accuracy shunt references for space-constrained, battery-operated instrumentation and data acquisition systems demanding sub-1µA operation and tight voltage stability.

FAQ

What is the guaranteed minimum operating current for MAX6008BESA+?

The MAX6008BESA+ guarantees a maximum minimum operating current of 1.0µA, defined as the lowest current at which the 2.5V output remains within ±0.2% of its value at 1.2µA. This specification ensures reliable startup and regulation in ultra-low-power systems such as energy-harvesting sensors and coin-cell devices where bias current budgets are tightly constrained. The MAX6008BESA+ maintains this performance across its full -40°C to +85°C operating range.

Does MAX6008BESA+ require an output capacitor, and if so, what value?

Yes, the MAX6008BESA+ requires a minimum 0.01µF capacitor connected between OUT (Pin 1) and GND (Pin 4) to ensure stability and reduce noise. This capacitor suppresses high-frequency oscillation and improves transient response during load or supply step changes. Larger values (e.g., 0.1µF) may further reduce overshoot in dynamic applications but do not affect DC accuracy. The requirement is explicitly specified in the Applications Information section of the MAX6008BESA+ datasheet.

What is the temperature coefficient specification for MAX6008BESA+?

The MAX6008BESA+ has a maximum temperature coefficient of 75ppm/°C over the full -40°C to +85°C operating range, measured using the "box" method (TC = (V_MAX – V_MIN) / (T_MAX – T_MIN)). This means its 2.5V output can drift up to ±0.15% across the temperature range - a critical parameter for applications like portable calibrators and precision sensor interfaces where ambient temperature varies widely. The value is guaranteed, not typical, and applies specifically to the B-grade device.

Can MAX6008BESA+ be used as a direct replacement for LT1004 in SO-8 sockets?

Yes, MAX6008BESA+ is explicitly offered as a plug-in upgrade for LT1004 in 8-pin SO packages per Maxim's ordering information table. It matches the LT1004's pinout (OUT on Pin 1, GND on Pin 4, NC on remaining pins) and provides improved specifications: 0.5% initial accuracy vs. LT1004's 1%, 75ppm/°C TC vs. 100ppm/°C, and guaranteed <1µA operation. No PCB changes are required, though users should verify RBIAS sizing due to differing minimum current requirements.

What is the low-frequency noise performance of MAX6008BESA+?

The MAX6008BESA+ specifies 60µV_P-P low-frequency noise over the 0.1Hz to 10Hz bandwidth at 1.2µA operating current. This noise level directly impacts effective resolution in high-precision ADC applications - for example, limiting ENOB in a 2.5V-referenced 24-bit delta-sigma converter. The value is measured and guaranteed, not typical, and reflects the combined contribution of bandgap core and internal resistor noise sources inherent to the BiCMOS process used in the MAX6008BESA+.