Analog Devices Inc. ADM6315-46D3ARTZR7

Overview

ADM6315-46D3ARTZR7 from Analog Devices is a precision open-drain microprocessor supervisory circuit in SOT-143 package, monitoring VCC at 4.63 V ±3.5% over −40°C to +125°C, asserting reset for minimum 140 ms after power-up or brownout, with 5 μA typical supply current and built-in debounced manual reset input. It ensures reliable startup and fault recovery in automotive safety systems and industrial controllers.

For engineers reviewing the ADM6315-46D3ARTZR7 datasheet, ADM6315-46D3ARTZR7 pinout, ADM6315-46D3ARTZR7 application, or ADM6315-46D3ARTZR7 equivalent, key selection criteria include reset threshold accuracy (±3.5% over full temp range), guaranteed 140 ms minimum timeout, open-drain RESET output compatible with higher-voltage logic domains, and MR input glitch immunity (100 ns rejection, ≥1 μs acceptance).

Technical Context

The ADM6315-46D3ARTZR7 integrates a precision voltage reference comparator with hysteresis and a temperature-compensated reset timer. Its internal threshold is trimmed to 4.63 V with ±2.5% tolerance at −40°C to +85°C and ±3.5% at −40°C to +125°C, enabling robust brownout detection even during rapid VCC transients.

It features an open-drain RESET output capable of sinking 3.2 mA at VCC > 4.25 V, and a debounced manual reset (MR) input with 1 μs minimum pulse width requirement and 100 ns glitch rejection-both critical for noise-immune system-level reset coordination in automotive and industrial environments.

Key Specifications

Pinout & Package

ADM6315-46D3ARTZR7 is housed in a 4-lead SOT-143 package (RA-4), measuring 2.9 mm × 1.6 mm × 1.1 mm, optimized for space-constrained PCB layouts in automotive and portable instrumentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US46D3+T and TPS3808G33DBVR, the ADM6315-46D3ARTZR7 uniquely delivers guaranteed ±3.5% threshold accuracy across −40°C to +125°C *and* factory-trimmed 140 ms timeout in a pin-defined SOT-143 package-enabling drop-in qualification for AEC-Q100 Grade 0 automotive applications without timing recalibration or layout changes.

Availability

ADM6315-46D3ARTZR7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and railway signaling interface boards requiring stable component supply with full AEC-Q100 temperature coverage and RoHS-compliant packaging.

Supply support for ADM6315-46D3ARTZR7 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 product line delivers precision voltage supervision with factory-trimmed thresholds and guaranteed timeout periods, designed specifically for mission-critical power sequencing and fault recovery in automotive safety systems and industrial control hardware.

FAQ

What is the exact reset threshold voltage of the ADM6315-46D3ARTZR7 and how does it vary with temperature?

The ADM6315-46D3ARTZR7 has a nominal reset threshold of 4.63 V, with tolerance of ±2.5% over −40°C to +85°C and ±3.5% over −40°C to +125°C. This specification is verified per Analog Devices Rev. I datasheet Table 1, ensuring predictable brownout detection across full automotive temperature range without external calibration. The ADM6315-46D3ARTZR7 maintains this accuracy using an internal bandgap reference with 60 ppm/°C temperature coefficient.

Does the ADM6315-46D3ARTZR7 require an external pull-up resistor on the RESET pin, and what voltage can it interface with?

Yes, the ADM6315-46D3ARTZR7 RESET pin is open-drain and requires an external pull-up resistor to define the logic-high voltage level. It can interface with logic domains up to 6 V (per Absolute Maximum Ratings), enabling direct connection to 5 V, 3.3 V, or 2.5 V microcontrollers-even when VCC is lower-without level-shifting circuitry. This capability is confirmed in the "Interfacing to Output of Other Devices" section of the ADM6315-46D3ARTZR7 datasheet.

How does the manual reset (MR) input of the ADM6315-46D3ARTZR7 behave when left unconnected?

When the MR pin of the ADM6315-46D3ARTZR7 is left floating, the internal circuitry disables manual reset functionality-no reset assertion occurs from that input. The ADM6315-46D3ARTZR7 datasheet explicitly states "Leave floating when not used" in Table 4, and no internal pull-up or pull-down is present. System reset remains fully controlled by VCC monitoring and the 140 ms timeout behavior.

What is the minimum VCC voltage at which the ADM6315-46D3ARTZR7 can still assert RESET, and why is this important?

The ADM6315-46D3ARTZR7 asserts RESET down to VCC > 1 V, as specified in the General Description and Absolute Maximum Ratings sections of its datasheet. This capability ensures fail-safe reset generation even during deep brownouts or battery depletion scenarios-critical for automotive cold-cranking and medical device safety shutdowns where supply may sag below 2 V but must still trigger controlled system halt before data corruption occurs.

Is the ADM6315-46D3ARTZR7 pin-compatible with other devices in the ADM6315 family, and what does that mean for PCB design?

Yes, all ADM6315 variants-including ADM6315-46D3ARTZR7-are pin-compatible within the SOT-143 package, sharing identical pinout (GND, RESET, MR, VCC) and footprint. This allows direct substitution between trip-point and timeout variants (e.g., D1/D2/D3/D4 suffixes) on the same PCB without layout modification, simplifying BOM management and enabling late-stage design optimization for different voltage rails or timing requirements.