EFM8LB12F64E-C-QFN24 - 72MHz 8051 MCU 64KB Flash QFN-24 | Silicon Labs
MPN: EFM8LB12F64E-C-QFN24 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.21 | $22.10 |
| 100 | $1.96 | $196.00 |
| 500 | $1.74 | $870.00 |
| 1,000 | $1.55 | $1,550.00 |
EFM8LB12F64E-C-QFN24 Overview
An 8-bit microcontroller (MCU) such as this EFM8LB1 device is a single-chip computer that combines an 8051-compatible CPU core, Flash program memory, RAM, and a rich set of analog and digital peripherals. Within the broader semiconductor taxonomy, an MCU falls under microcontrollers, which in turn sit inside the integrated-circuits hierarchy as one of the most widely deployed device families for embedded control. The 8051 architecture, originally introduced by Intel in 1980, remains one of the longest-lived CPU instruction sets in the industry.
Key features include 6 x 16-bit timers, multiple communication interfaces (UART, SPI, I2C, and integrated CAN), an on-chip VDD monitor, a watchdog timer, a ±2% internal oscillator, and an internal calibrated temperature sensor with ±3 °C accuracy. The pipelined CIP-51 core executes most instructions in one to two system clocks, effectively doubling throughput versus a standard 8051 running at the same frequency.
Typical applications include optical modules, LED lighting controllers, sensor signal conditioning, industrial control nodes, and consumer devices that require both analog precision and 8-bit MCU economics. The wide 2.2V to 3.6V supply range and small 3x3 mm footprint suit space-constrained PCB designs.
When designing with this part, ensure decoupling capacitors are placed close to VDD pins, and that ADC inputs are referenced properly to minimize conversion noise. Developers can use Silicon Labs' Simplicity Studio with the built-in configuration wizards to accelerate firmware bring-up.
Drop-in alternatives for EFM8LB12F64E-C-QFN24 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with EFM8LB12F64E-C-QFN24 (same form factor and footprint) — differing in ADC, DAC, Package, RAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
EFM8LB12F64ES1-C-QFN24
✅ Drop-In📋 Reference alternative (not in catalog)
EFM8LB11F32ES1-C-QFN24R
✅ Drop-In✓ In Stock
$0.99 / Unit
View Datasheet →EFM8LB12F64E-A-QFN24
✅ Drop-In📋 Reference alternative (not in catalog)
EFM8LB12F64E-C-QFN24 Maximum Ratings & Electrical Characteristics
| Core Architecture | CIP-51 8051 (pipelined) |
| Data Bus Width | 8-bit |
| Maximum CPU Frequency | 72 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| RAM | 4.25 KB (256 B standard + 4 KB XRAM) |
| Supply Voltage (VDD) | 2.2 V to 3.6 V |
| ADC | 14-bit, 12-channel, up to 900 ksps |
| DAC | 4 x 12-bit |
| Comparators | 2 low-current |
| Configurable Logic Units | 4 |
| Timers | 6 x 16-bit |
| Digital I/O Pins | 20 |
| Communication Interfaces | UART, SPI, I2C, CAN |
| Package | 24-pin QFN (3x3 mm) |
| Mounting Type | Surface Mount |
| Internal Oscillator Accuracy | +/-2% |
| Internal Temperature Sensor Accuracy | +/-3 C |
| RoHS Status | Compliant |
EFM8LB12F64E-C-QFN24 Pin Configuration
| Pin 1 | P0.0 — Port 0.0 / I/O |
| Pin 2 | P0.1 — Port 0.1 / I/O |
| Pin 3 | P0.2 — Port 0.2 / I/O |
| Pin 4 | P0.3 — Port 0.3 / I/O |
| Pin 5 | P0.4 — Port 0.4 / I/O |
| Pin 6 | P0.5 — Port 0.5 / I/O |
| Pin 7 | P0.6 — Port 0.6 / I/O |
| Pin 8 | P0.7 — Port 0.7 / I/O |
| Pin 9 | VDD — Power supply 2.2V-3.6V |
| Pin 10 | VSS — Ground |
| Pin 11 | P1.0 — Port 1.0 / I/O |
| Pin 12 | P1.1 — Port 1.1 / I/O |
| Pin 13 | P1.2 — Port 1.2 / I/O |
| Pin 14 | P1.3 — Port 1.3 / I/O |
| Pin 15 | P1.4 — Port 1.4 / I/O |
| Pin 16 | P1.5 — Port 1.5 / I/O |
| Pin 17 | P1.6 — Port 1.6 / I/O |
| Pin 18 | P1.7 — Port 1.7 / I/O |
| Pin 19 | P2.0 — Port 2.0 / I/O |
| Pin 20 | P2.1 — Port 2.1 / I/O |
| Pin 21 | P2.2 — Port 2.2 / I/O |
| Pin 22 | P2.3 — Port 2.3 / I/O |
| Pin 23 | RESETn — Active-low reset input |
| Pin 24 | VSS — Ground / thermal pad |
Typical Applications
EFM8LB12F64E-C-QFN24 is suitable for 6 applications: Optical Module / SFP Transceiver Controller, Precision Sensor Signal Conditioning, LED Lighting and Color Mixing Controller, Industrial Control and Modbus Nodes, Consumer Appliance Control Boards, Battery-Powered IoT Sensor Edge Nodes.
Optical Module / SFP Transceiver Controller
The EFM8LB12F64E-C-QFN24 is purpose-built for optical module applications such as SFP, SFP+, and QSFP transceivers, where the 14-bit 12-channel ADC sampling at 900 ksps monitors receive optical power (RSSI) and the four 12-bit DACs precisely bias the laser diode's modulation and APC loops. The integrated CAN, UART, and I2C interfaces handle host-side management (SFF-8472 digital diagnostics), while two low-current comparators enable loss-of-signal (LOS) detection without an external part. The 3x3 mm QFN24 footprint fits inside standard SFP module mechanical envelopes, and the 2.2-3.6V supply matches typical 3.3V module rails directly.
Recommended
Precision Sensor Signal Conditioning
With a 14-bit 900 ksps ADC, four 12-bit DACs, two comparators, and four configurable logic units (CLUs), the EFM8LB12F64E-C-QFN24 can replace multi-chip analog front ends in sensor-conditioning applications. The CLUs let designers implement custom glue logic in hardware, freeing the CPU for higher-level filtering; the calibrated +/-3 C internal temperature sensor provides local cold-junction compensation for thermocouple interfaces. At $1.55 per unit at qty 1000, it offers price/performance that beats dedicated AFEs for moderate-accuracy industrial sensing at 8-bit economics.
Recommended
LED Lighting and Color Mixing Controller
Each of the four 12-bit DACs on the EFM8LB12F64E-C-QFN24 can independently drive an LED driver current-set pin, enabling RGBA or RGBW color-mixing architectures without extra analog ICs. The 72 MHz 8051 core executes DMX-512, DALI, or proprietary lighting protocols in real time, while the six 16-bit timers generate accurate PWM dimming waveforms up to 16-bit resolution. The 2.2V minimum supply supports single-cell Li-ion or 3.3V regulated designs common in architectural lighting fixtures.
Recommended
Industrial Control and Modbus Nodes
The integrated CAN 2.0B controller, plus UART and I2C, make the EFM8LB12F64E-C-QFN24 a natural fit for industrial Modbus RTU, CANopen, or J1939 slave nodes. Its 64 KB Flash hosts complete Modbus/CANopen stacks with room left for application logic, and the 4 KB XRAM buffers protocol messages without CPU stalls. The 14-bit ADC reads 4-20 mA loop inputs directly via a 250 ohm shunt, while the comparators detect loop-current faults faster than polling the ADC.
Recommended
Consumer Appliance Control Boards
White goods and small appliances benefit from the EFM8LB12F64E-C-QFN24's combination of low cost, small footprint, and integrated analog peripherals. The 14-bit ADC reads NTC temperature sensors for refrigerator or washing-machine control, the comparators implement zero-crossing detection for triac-fired heater elements, and the four DACs generate reference voltages for multi-zone temperature control. Simplicity Studio and the 8051 toolchain shorten firmware development cycles for high-volume consumer designs.
Recommended
Battery-Powered IoT Sensor Edge Nodes
Although not the lowest-power MCU on the market, the EFM8LB12F64E-C-QFN24 offers strong sleep-mode characteristics and 2.2V minimum supply for 2x AA battery packs, making it competitive for duty-cycled IoT edge nodes where its integrated ADC/DAC eliminate extra analog ICs that would otherwise drain the battery. The +/-2% internal oscillator removes the need for an external crystal in many designs, and the 4 KB XRAM buffers sensor data bursts between sleep cycles.
Recommended
Recommended Products Summary
Engineering reference data for EFM8LB12F64E-C-QFN24 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | EFM8LB12F64ES1-C-QFN24 | EFM8LB11F32ES1-C-QFN24R | EFM8LB12F64E-A-QFN24 |
|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Package | 24-QFN (3x3 mm) | 24-QFN (3x3 mm) - same | 24-QFN (3x3 mm) - same | 24-QFN (3x3 mm) - same |
| Core | CIP-51 8051 8-bit | CIP-51 8051 8-bit - same | CIP-51 8051 8-bit - same | CIP-51 8051 8-bit - same |
| Maximum CPU Frequency | 72 MHz | 72 MHz - same | 72 MHz - same | 72 MHz - same |
| Flash Memory | 64 KB | 64 KB - same | 32 KB (-50%) | 64 KB - same |
| RAM | 4.25 KB | 4.25 KB - same | 4.25 KB - same | 4.25 KB - same |
| ADC | 14-bit 12-ch 900 ksps | 14-bit 12-ch 900 ksps - same | 14-bit 12-ch 900 ksps - same | 14-bit 12-ch 900 ksps - same |
| DACs | 4 x 12-bit | 4 x 12-bit - same | 4 x 12-bit - same | 4 x 12-bit - same |
| Supply Voltage | 2.2 V to 3.6 V | 2.2 V to 3.6 V - same | 2.2 V to 3.6 V - same | 2.2 V to 3.6 V - same |
Key Differentiators
- Highest analog density in the 8-bit MCU class (vs EFM8LB11F32ES1-C-QFN24R)
- Drops into the same 3x3 mm QFN24 footprint as other Laser Bee parts (vs EFM8LB12F64E-A-QFN24)
- Integrated CAN 2.0B controller in an 8-bit MCU (vs EFM32G200F64G-E-QFN32R (32-bit ARM alternative))
Design Notes
Place a 0.1 uF decoupling capacitor as close as possible to the VDD pin and a 1 uF bulk capacitor on the same rail. For ADC-noise-sensitive applications, add a ferrite bead between the digital VDD and the AVVDD analog supply pin to isolate high-frequency switching noise. The internal VDD monitor handles brown-out below the configured threshold, so external POR circuits are usually unnecessary.
Route the analog ADC inputs away from digital switching traces (PWM, UART, SPI clocks). Use a guarded ground plane around ADC input pins and route analog returns directly to the AVSS pin rather than sharing a digital ground path. The QFN24 thermal pad must be soldered to a copper pour of at least 10x10 mm for reliable thermal performance.
Do not drive the RESETn pin low at power-up; allow the internal VDD monitor to handle reset sequencing. Avoid using Port 0 pins for high-current loads - they have limited drive strength versus Port 1. When migrating firmware between EFM8LB1 sub-family variants, re-check the flash wait-state configuration since parts with less than 32 KB Flash may use different default timing.
Compliance Information
RoHS compliance confirmed by distributor listings (DigiKey/Mouser). Not AEC-Q100 qualified - this is a commercial/industrial grade part; automotive applications should evaluate EFM8LB1 AEC-Q100 variants separately. Lead-free reflow profile per JEDEC J-STD-020.
