Microchip Technology MCP1703T-1802E/CB

MCP1703T-1802E/CB regulates a 1.8 V rail from inputs up to 16 V. Because its rated output is below 2.5 V, available current depends on input voltage: the data sheet specifies a 200 mA maximum continuous rating and provides lower guaranteed-current points at lower input headroom.

The /CB suffix selects Microchip's three-lead SOT-23A package. SOT-23-3 is the registered catalog package name and JPG used here.

Layout checks

• Use Microchip's current CB SOT-23A outline and recommended land pattern.
• Keep the input and output capacitors close to their respective pins.
• Use short ground returns to limit parasitic impedance.
• Provide PCB copper appropriate for calculated regulator loss.

Confirm pin numbering, orientation, package dimensions, and the approved SOT-23-3 footprint before assembly.

Pin assignments below apply to the three-lead SOT-23A CB package.

The SOT-23A pin order differs from MCP1703 SOT-89 and SOT-223 options. Check the exact package diagram before transferring a symbol or footprint.

Microchip does not specify a single dropout value for output options below 2.5 V; use the maximum-output-current table instead of extrapolating the higher-voltage dropout rows.

No unconditional substitute is asserted. Match the fixed 1.8 V output, low-voltage current-versus-input limits, 16 V input capability, quiescent current, capacitor range, protection behavior, temperature grade, SOT-23A footprint, and GND/VOUT/VIN pin order.

The CB, DB, and MB suffixes identify different packages and pin arrangements. A VAO suffix identifies explicitly automotive-qualified variants; this exact standard code has no VAO suffix. No internal link is included because no exact API-confirmed alternative was established.

Microchip Technology lists the MCP1703 family as in production. In MCP1703T-1802E/CB, T denotes tape and reel, 18 denotes 1.8 V, 0 denotes fixed output, 2 denotes standard tolerance, E denotes -40°C to +125°C, and CB denotes three-lead SOT-23A.

The data sheet distinguishes standard parts from VAO automotive-qualified order codes. This exact code has no VAO suffix and is not represented as the automotive-qualified variant.

Verify the complete MCP1703T-1802E/CB order code, three-lead SOT-23A body, tape-and-reel label, date code, lot traceability, and the standard 1.8 V SOT-23A marking symbol HQ.

Do not treat family-level AEC-Q100 capability as proof that a standard order code is automotive qualified. Confirm a VAO suffix whenever that qualification is required.

This summary supports component evaluation but does not replace manufacturer-controlled documentation. Confirm input transients, available current at the intended VIN, capacitor effective value, output accuracy, startup, short-circuit behavior, and the exact package drawing.

Calculate power loss from input voltage, 1.8 V output, load current, and quiescent current. Keep junction temperature within limits using the actual PCB copper, airflow, ambient temperature, and SOT-23A thermal path.