Analog Devices Inc. ADM1815-R22AKSZ-R7

Overview

ADM1815-R22AKSZ-R7 from Analog Devices is a precision active-low microprocessor reset circuit in SC70-3 package, monitoring 2.18 V supply threshold with 150 ms reset timeout, 9–16 µA supply current, and open-drain output with internal 5.5 kΩ pull-up resistor-used for safe power-on initialization in low-voltage embedded controllers.

For engineers reviewing the ADM1815-R22AKSZ-R7 datasheet, ADM1815-R22AKSZ-R7 pinout, ADM1815-R22AKSZ-R7 application, or ADM1815-R22AKSZ-R7 equivalent, this page delivers verified functional identity, trip-point accuracy, reset timing behavior, package-specific thermal performance (θJA = 146°C/W), and validated alternative options for 2.18 V supply monitoring in industrial and automotive control systems.

Technical Context

The ADM1815-R22AKSZ-R7 implements a bandgap-based voltage reference with ±1.5% typical trip-point tolerance over −40°C to +105°C, feeding a comparator that triggers an open-drain RST output held low during undervoltage and for 150 ms after VCC rises above 2.18 V (typ). Its internal pull-up eliminates external components in standard reset interface designs.

This variant belongs to the ADM1815/ADM1816/ADM1817/ADM1818 family optimized for sub-3 V supplies, differing from ADM1810–ADM1813 by trip-point range (2.12–3.15 V vs. 4.25–4.75 V) and output architecture (open-drain with internal pull-up vs. push-pull). It shares identical SC70-3 pinout and timing specs with ADM1816-R22AKSZ-R7 but features active-low reset logic.

Key Specifications

Pinout & Package

ADM1815-R22AKSZ-R7 uses the 3-lead SC70 (KS-3) package: 1.20 mm height, 2.20 mm × 1.35 mm body, JEDEC-compliant outline with coplanarity ≤0.10 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM1815-R22AKSZ-R7, ADM1816-R22AKSZ-R7 offers identical monitoring performance with reversed reset polarity, while TPS3808G12DBVR trades higher accuracy and manual reset support for increased component count and larger package-making ADM1815-R22AKSZ-R7 optimal for cost- and space-constrained 2.18 V reset applications requiring active-low signaling.

Availability

ADM1815-R22AKSZ-R7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical sensor nodes requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.

Supply support for ADM1815-R22AKSZ-R7 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 ADM181x series was designed specifically for robust, low-cost power-supply monitoring in space-constrained embedded systems-emphasizing factory-trimmed accuracy, wide temperature operation, and minimal external component count.

FAQ

What is the exact reset threshold voltage for ADM1815-R22AKSZ-R7?

The ADM1815-R22AKSZ-R7 has a nominal reset threshold of 2.18 V (typical), with guaranteed min/max values of 2.12 V and 2.25 V across −40°C to +105°C. This value is factory-trimmed and specified in Table 1 of the Rev. F datasheet under "VCC TRIP POINT" for the "ADM1815-R22" variant. It is intended for monitoring 2.5 V supplies with appropriate headroom.

Does ADM1815-R22AKSZ-R7 require an external pull-up resistor on the RST pin?

No, ADM1815-R22AKSZ-R7 does not require an external pull-up resistor. It integrates a 5.5 kΩ (typical) internal pull-up resistor on the open-drain RST output, enabling direct connection to standard CMOS reset inputs. This is confirmed in Table 1 ("INTERNAL PULL-UP RESISTOR") and Figure 11 of the datasheet.

What is the reset timeout duration of ADM1815-R22AKSZ-R7 after VCC rises above threshold?

The ADM1815-R22AKSZ-R7 asserts reset for 150 ms (typical) after VCC rises above the 2.18 V threshold, with a guaranteed range of 100–250 ms. This delay is fixed and internally generated-no external capacitor is needed. The timing is documented in Table 1 under "RESET ACTIVE TIME" and illustrated in Figure 10 (Power-Up Timing Diagram).

Is ADM1815-R22AKSZ-R7 compatible with SOT-23-3 footprints?

No, ADM1815-R22AKSZ-R7 uses the SC70-3 (KS-3) package, which is physically smaller and not mechanically compatible with SOT-23-3. SC70 measures 2.20 mm × 1.35 mm with 0.65 mm lead pitch, whereas SOT-23 is 2.90 mm × 1.30 mm with 0.95 mm pitch. Pin numbering differs: SC70 pin 1 = RST, SOT-23 pin 1 = RST-but pad layout and solder stencil must match KS-3 dimensions.

Can ADM1815-R22AKSZ-R7 be used for manual reset functionality?

No, ADM1815-R22AKSZ-R7 does not support manual reset. Only ADM1813 and ADM1818 variants include push-button reset capability (documented in "ADM1813 AND ADM1818" section, Page 7). ADM1815-R22AKSZ-R7 is a dedicated supply monitor with no manual reset input or associated timing circuitry.