MCP1792T-4102H/CB - 4.1V 100mA High-Voltage LDO | Microchip
MPN: MCP1792T-4102H/CB ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MCP1792T-4102H/CB Overview
A low-dropout regulator, or LDO, is a linear voltage regulator that passes input voltage to its output through a conducting pass element while regulating the output with very little voltage difference between input and output. An LDO belongs to the linear-regulator and voltage-regulator hierarchy within power-management semiconductors. Unlike a switching DC-DC converter, an LDO introduces no switching ripple, although the unused voltage is dissipated as heat.
Key features include a 4.1 V fixed output, 100 mA maximum output current, and an unusually broad 4.5 V to 55 V operating-input range. The high-voltage capability lets the device derive a low-voltage rail without an upstream step-down stage. Its low ground current of 100 microamperes and low undervoltage-lockout behavior also support efficient operation from high-voltage battery packs and protected industrial supplies.
The MCP1792 belongs to the MCP1792/MCP1793 high-voltage LDO family. These regulators target applications requiring low quiescent demand and a compact three-pin implementation. Because output-current capability is only 100 mA, the device is intended for sensors, interface circuits, housekeeping rails, and control electronics rather than motors, heaters, or high-current power stages.
Typical uses include 12 V to 48 V industrial control rails, automotive-style electrical systems, high-voltage battery packs, sensor interfaces, and low-current embedded-control loads. The 4.1 V output can power compatible mixed-signal, sensing, or logic circuitry when that equipment specifically requires a 4.1 V rail. The SOT-23A footprint simplifies compact PCB layouts, although correct input and output capacitors remain essential for stability.
The principal design consideration is thermal dissipation. Because this is a linear regulator, power loss is approximately the difference between input and output voltage multiplied by load current. A design operating near 55 V input with 100 mA load therefore has a large thermal burden and should be evaluated against the package and ambient-temperature limits in the manufacturer datasheet.
This product page combines the verified 4.1 V, 100 mA, 4.5 V-to-55 V, 3-lead SOT-23A information with practical thermal guidance, application context, and a conservative replacement assessment. Distributor availability and pricing change over time, so buyers should confirm current stock, lifecycle status, and lot traceability before committing to production procurement.
Drop-in alternatives for MCP1792T-4102H/CB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MCP1792T-4102H/CBVAO
✅ Drop-In📋 Reference alternative (not in catalog)
MCP1792T-4102H/CB Maximum Ratings & Electrical Characteristics
| Regulator Type | Positive fixed low-dropout linear regulator |
| Output Configuration | Single output |
| Fixed Output Voltage | 4.1 V |
| Maximum Output Current | 100 mA |
| Input Voltage Range | 4.5 V to 55 V |
| Ground Current | 100 microamperes |
| Number of Outputs | 1 |
| Output Type | Fixed |
| Package | 3-lead SOT-23A |
| Package Pin Count | 3 pins |
| Mounting Type | Surface mount |
| Shipping Package | Tape and reel |
| Undervoltage Lockout | Low UVLO |
| Automotive Qualification | Automotive LDO |
MCP1792T-4102H/CB Pin Configuration
| Pin 1 | VIN — High-voltage regulator input |
| Pin 2 | GND — Regulator ground connection |
| Pin 3 | VOUT — Fixed 4.1 V regulator output |
Typical Applications
MCP1792T-4102H/CB is suitable for 6 applications: Industrial 24 V Control Rail, Automotive Electrical-System Rail, 48 V Battery-Pack Management, Sensor and Transducer Interface, High-Voltage Embedded-Control Housekeeping, Telecom and Data-Equipment Supply.
Industrial 24 V Control Rail
The MCP1792T-4102H/CB fits industrial control systems that require a compact 4.1 V housekeeping rail from a nominal 24 V supply. Its verified 4.5 V to 55 V input rating covers a 24 V bus, while the 100 mA output supports sensors, isolated-interface electronics, and low-current control logic. Place the regulator close to the protected supply and load with the input and output capacitors specified by the family data sheet. Because it is linear, dissipation rises as input voltage and load current increase; at 24 V input and 100 mA, the estimated loss is about 1.99 W before auxiliary losses. Copper area and thermal verification are therefore essential in compact enclosures.
Recommended
Automotive Electrical-System Rail
The MCP1792T-4102H/CB is positioned as an automotive high-input-voltage LDO for generating 4.1 V from 12 V to 48 V electrical environments. Its 100 mA rating suits sensors, interface circuits, and control loads rather than pumps or high-power accessories. The broad input range allows the same regulator family to address conventional and elevated-voltage vehicle systems. Designers must still verify the exact orderable variant's qualification, temperature limits, transient response, and pin compatibility against Microchip DS20006229C. Input protection and grounding are as important as regulation: transient suppression should be placed according to the reference design, and high-current vehicle wiring must not share an unrestricted path with the sensitive analog return.
Recommended
48 V Battery-Pack Management
The MCP1792T-4102H/CB can create a fixed 4.1 V rail from high-voltage battery packs because Microchip specifies an input range extending to 55 V. Its low 100 microampere ground current suits low-power monitoring and balancing electronics when the upstream battery-management architecture remains active. The regulator's 100 mA ceiling restricts it to sensors, communications, and housekeeping loads, not the pack's main power path. Designers should account for battery chemistry, maximum charge voltage, cold-weather behavior, and fault transients. Estimated dissipation at 48 V input and full 100 mA load is 4.39 W, so battery systems with sustained high bus voltage may require a lower-loss topology or deliberate load derating.
Recommended
Sensor and Transducer Interface
The MCP1792T-4102H/CB is appropriate for powering low-current sensor interfaces when the source is a protected 12 V to 48 V rail. Its linear topology avoids introducing a DC-DC converter's switching ripple into the supply, which can help when the interface has a limited noise budget. The fixed 4.1 V output must match the sensor, amplifier, and protection-device ratings; it should not automatically replace a 3.3 V or 5 V requirement. Keep the regulator's ground path separate from high-current motor returns where practical. Place input and output capacitors directly at the relevant pins, maintain short traces, and verify source impedance because long supply wiring can introduce instability or disturbance not represented by the nominal 100 mA rating.
Recommended
High-Voltage Embedded-Control Housekeeping
The MCP1792T-4102H/CB can supply a dedicated 4.1 V housekeeping rail for embedded-control logic, reset circuitry, and interface blocks in a high-voltage system. Its compact SOT-23A package saves board area compared with many larger regulators, while the 55 V input capability removes the need for a preceding step-down stage when the load consumes no more than 100 mA. This configuration is most attractive when simplicity and low output noise matter more than conversion efficiency. At 55 V input and 4.1 V output, estimated full-load dissipation reaches 5.09 W, which may exceed the package's practical thermal capability for sustained operation. Use the datasheet limits to select pulse loading, copper cooling, or a switching regulator when the high-voltage rail is continuous.
Recommended
Telecom and Data-Equipment Supply
The MCP1792T-4102H/CB can support low-current housekeeping sections of telecom or data equipment operating from a 12 V to 48 V distributed bus. The fixed 4.1 V output is useful for circuitry specifically designed for that voltage, and the regulator's linear operation avoids the switching frequency and magnetics associated with a buck converter. Its 100 mA rating limits it to monitoring, control, and interface loads rather than processor cores or fan drives. In multi-card equipment, isolate the regulator's input from noisy neighboring converters and provide local high-frequency bypass at its pins. Thermal analysis should use worst-case bus voltage rather than nominal voltage, since estimated loss scales directly with VIN minus 4.1 V.
Recommended
Recommended Products Summary
Engineering reference data for MCP1792T-4102H/CB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCP1792T-4102H/CBVAO |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | SOT-23A-3 | SOT-23A-3 |
| Output Voltage | 4.1 V fixed | 4.1 V fixed |
| Maximum Output Current | 100 mA | 100 mA |
| Output Configuration | Positive, single output | Positive, fixed output |
| Orderable Suffix | T-4102H/CB | T-4102H/CBVAO; temperature and qualification details require verification |
Key Differentiators
- Wide high-voltage input range in a compact three-pin package (vs Lower-input-range LDOs in SOT-23 packages)
- Low ground-current demand for a high-input-voltage regulator (vs Higher-quiescent-current linear regulators)
- Automotive-oriented family positioning (vs Generic industrial low-voltage regulators)
Design Notes
Estimated: use PD approximately equal to (VIN - 4.1 V) x IOUT plus ground-current loss. At 48 V and 100 mA, PD is approximately 4.39 W; at 55 V and 100 mA, it is 5.09 W. These calculations are engineering estimates, not guaranteed datasheet ratings. Determine whether the SOT-23A copper area can keep the junction within its family-specific thermal limit at the maximum ambient temperature. Reduce load or use a higher-efficiency topology if sustained high-voltage operation produces excessive temperature rise.
Place the required input and output capacitors close to their corresponding SOT-23A pins and use the shortest practical traces for VIN and VOUT. Keep the regulator ground return compact and route high-current return currents away from sensitive measurement grounds. Confirm footprint orientation, pin numbering, paste, and land pattern against the official DS20006229C package drawing; the CB suffix should not be treated as evidence of a different electrical pinout.
Do not substitute a same-package device solely because it is also an LDO. The replacement must provide 4.1 V fixed output, tolerate the full input voltage, support at least 100 mA, and satisfy the original capacitor and stability requirements. MCP1792T-3302H/CB, for example, is a different 3.3 V output and is not equivalent for a 4.1 V load. Confirm the exact suffix, temperature grade, qualification, and lifecycle status before substitution.
Compliance Information
Distributor listings identify the device as an automotive LDO, but the supplied verified results do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals compliance. These fields remain unknown until confirmed from the manufacturer declaration or exact orderable-part documentation.
