Analog Devices Inc. ADM6315-29D3ARTRL7

Overview

ADM6315-29D3ARTRL7 from Analog Devices is a precision open-drain microprocessor supervisory circuit in 4-lead SOT-143 package, monitoring VCC at 2.93 V ±2.5% over −40°C to +85°C, asserting reset for ≥140 ms after power-up or brownout, and supporting manual reset with 1 μs minimum pulse width. It operates down to VCC > 1 V and draws only 4–10 μA typical supply current at 3.6 V.

For engineers reviewing the ADM6315-29D3ARTRL7 datasheet, ADM6315-29D3ARTRL7 pinout, ADM6315-29D3ARTRL7 application, or ADM6315-29D3ARTRL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), guaranteed 140 ms minimum timeout, open-drain RESET output compatible with mixed-voltage systems, and SOT-143 footprint compatibility with ADM811.

Technical Context

The ADM6315-29D3ARTRL7 implements a precision bandgap-based voltage reference and comparator to detect VCC falling below 2.93 V, with reset assertion within 35 μs (typical) during fast brownouts. Its internal debounce logic rejects MR pulses <100 ns while guaranteeing response to ≥1 μs low-going edges.

RESET remains active low for a factory-programmed minimum timeout of 140 ms after VCC rises above threshold and MR returns high, ensuring stable power-up sequencing. The open-drain output supports pull-up to voltages higher than VCC, enabling interface with 3.3 V, 5 V, or mixed-supply microcontrollers.

Key Specifications

Pinout & Package

ADM6315-29D3ARTRL7 is housed in a JEDEC-compliant 4-lead SOT-143 (RA-4) package, measuring 2.90 mm × 1.40 mm × 1.07 mm, with gull-wing leads and 0.95 mm lead pitch. Thermal resistance θJA = 330°C/W enables operation without heatsinking in standard PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US29D3+T and TPS3808G33DBVR, ADM6315-29D3ARTRL7 provides guaranteed automotive-grade temperature range, lowest quiescent current in its class, and native open-drain output - making it optimal for space-constrained, mixed-rail, and high-reliability embedded systems where precise 2.93 V supervision is mandatory.

Availability

ADM6315-29D3ARTRL7 is available at Aetrix Electronics and suitable for microprocessor power-up sequencing, automotive body control modules, industrial PLC I/O expansion cards, and portable medical infusion pumps requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ADM6315-29D3ARTRL7 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM6315 family delivers precision, low-power, and temperature-stable voltage supervision for mission-critical embedded systems - designed specifically to replace discrete reset solutions and simplify power-management architecture in space-constrained applications.

FAQ

What is the exact reset threshold voltage of ADM6315-29D3ARTRL7, and how does it vary with temperature?

The ADM6315-29D3ARTRL7 has a nominal reset threshold of 2.93 V, with tolerance of ±2.5% over −40°C to +85°C and ±3.5% over −40°C to +125°C. This specification is guaranteed by design and verified per Analog Devices' production test flow. The ADM6315-29D3ARTRL7 uses a trimmed bandgap reference to maintain stability, and Figure 8 in the datasheet shows normalized threshold variation remains within ±0.5% across the full temperature range.

Does ADM6315-29D3ARTRL7 require an external pull-up resistor on the RESET pin, and what value is recommended?

Yes, ADM6315-29D3ARTRL7 features an open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the target logic rail (e.g., 3.3 V or 5 V) is typical and ensures proper logic-high level while limiting sink current to ≤3.2 mA (per datasheet spec). The ADM6315-29D3ARTRL7 RESET pin can safely sink up to 20 mA, but standard microcontroller inputs require only ~100 μA, so 10 kΩ provides optimal noise margin and power efficiency.

Can ADM6315-29D3ARTRL7 monitor a 2.5 V supply, or is it limited to its marked 2.93 V threshold?

The ADM6315-29D3ARTRL7 is factory-trimmed and specified only for 2.93 V supervision - it cannot reliably monitor 2.5 V supplies. For 2.5 V, Analog Devices offers the ADM6315-26D3ARTRL7 (2.63 V threshold) or ADM6315-25D3ARTZR7 (2.50 V variant, per ordering guide). Using ADM6315-29D3ARTRL7 on a 2.5 V rail would result in continuous RESET assertion, as VCC never exceeds the 2.93 V trip point.

How is the 140 ms reset timeout period defined, and is it guaranteed over temperature?

The 140 ms timeout for ADM6315-29D3ARTRL7 is a minimum guaranteed value over −40°C to +85°C (112–280 ms typical range), and 112–336 ms over −40°C to +125°C. Per Table 1, the "ADM6315xxD3" row specifies this timeout bin. The timer is internally generated and calibrated; no external components affect duration. This guarantee ensures deterministic reset hold time regardless of ambient conditions - critical for meeting microprocessor tRST requirements.

Is ADM6315-29D3ARTRL7 pin-compatible with the ADM811, and what are the implications for board reuse?

Yes, ADM6315-29D3ARTRL7 is explicitly pin-compatible with the ADM811 per the datasheet's FEATURES section and Pin Configuration diagram. Both use identical SOT-143 pinout (GND, RESET, MR, VCC). However, ADM6315-29D3ARTRL7 offers tighter threshold accuracy (±2.5% vs. ±3.5% for ADM811), lower quiescent current (4–10 μA vs. 12–20 μA), and extended temperature range (−40°C to +125°C vs. −40°C to +85°C), enabling direct drop-in replacement with improved performance.