PAC1944T-E/4MX Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
The PAC1944T-E/4MX is a 4-channel high-side current and power monitor with I2C/SMBus interface, dual alert outputs, and up to 9V bus voltage support in a compact 16-lead VQFN package. It simultaneously measures current, voltage, and power across four independent rails for energy profiling and power management. Available worldwide with fast shipping.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- PAC1944T-E/4MX Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.4600(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4-channel simultaneous high-side current, voltage, and power measurement on independent rails up to 9V
- I2C/SMBus digital interface enables easy integration with host processors for real-time energy profiling
- Dual programmable alert outputs notify the system of overcurrent or overvoltage threshold violations
- Compact 16-lead VQFN (3mm × 3mm) no-lead package minimizes PCB footprint in space-constrained power monitoring designs
- Accumulator registers support time-averaged energy measurement for precise per-rail power budget tracking
Applications
The PAC1944T-E/4MX is designed for embedded systems, servers, and portable devices where simultaneous power monitoring of multiple voltage rails is required for dynamic power management and efficiency optimization. It is well suited for SBC (single-board computer) designs, battery-powered IoT gateways, and industrial controllers that need to track per-rail energy consumption via I2C without discrete current-sense circuits on each channel. The dual alert outputs also make it useful in protection circuits that must trigger load-shedding or system shutdown when any of the 4 monitored rails exceeds a preset current or power threshold.
Specifications
| Manufacturer Package Code | VQFN-16 |
| Factory Lead Time | 5Weeks |
| YTEOL | 23 |
| Adjustable Threshold | NO |
| Analog IC - Other Type | VOLTAGE SUPERVISOR/RESET IC |
| JESD-30 Code | S-PQCC-N16 |
| JESD-609 Code | e3 |
| Number of Channels | 4 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Supply Current-Max (Isup) | 0.495mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2.7V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | YES |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many channels does the PAC1944T-E/4MX monitor simultaneously and what parameters does it measure on each?
The PAC1944T-E/4MX monitors 4 independent channels simultaneously, measuring high-side current, bus voltage, and calculated power on each rail. All 4 channels operate concurrently, eliminating the need for multiplexed or sequential sampling that could miss fast transient load events, and the results are available over the I2C/SMBus interface with up to 9V maximum bus voltage per channel.
Can the PAC1944T-E/4MX be used to track energy consumption over time, for example in a battery life audit?
Yes, the PAC1944T-E/4MX includes accumulator registers that sum measured power samples over time, enabling time-integrated energy calculations in units of watt-seconds (joules). A host processor can read the accumulators at intervals — for example every 1 second or every 60 seconds — and integrate total energy consumed across all 4 rails, which is useful for battery life auditing, efficiency benchmarking, and generating per-channel power budgets in IoT devices or portable instruments.
How do the 2 alert outputs on the PAC1944T-E/4MX help in a system protection design?
The PAC1944T-E/4MX provides 2 configurable alert output pins that assert when measured current or power on any monitored channel crosses a programmable threshold, allowing the host controller to respond within microseconds to overload conditions. In a system protection design, one alert can trigger a soft shutdown sequence while the second alerts at a lower warning threshold, giving the firmware 2-stage overcurrent protection across all 4 monitored rails without requiring a dedicated analog comparator on each channel.
What is the PAC1944T-E/4MX package and how does it fit into a compact server or SBC power management layout?
The PAC1944T-E/4MX uses a 16-lead VQFN package with a body size of approximately 3mm × 3mm and no external leads, allowing a very small PCB footprint. On a compact single-board computer or server power management board, this package replaces 4 discrete current-sense amplifiers plus a multi-channel ADC, consolidating the monitoring function into a single 9mm² footprint and reducing the overall component count and routing complexity for multi-rail power supervision.
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