R5F56216BDFB - 100MHz 32-bit RX621 MCU, 256KB Flash | Renesas
MPN: R5F56216BDFB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.8 | $9.80 |
| 10 | $8.85 | $88.50 |
| 100 | $7.92 | $792.00 |
| 500 | $7.05 | $3,525.00 |
| 1,000 | $6.3 | $6,300.00 |
R5F56216BDFB Overview
An RX-family microcontroller is a 32-bit RISC MCU built around the Renesas RXv1 core, sitting in the hierarchy above 8/16-bit microcontrollers and below general-purpose DSPs in embedded-system taxonomy. The RX core combines single-cycle execution, an on-chip FPU, and tightly-coupled memory architecture to deliver deterministic real-time performance while retaining C-language programming ease. This category is widely used in industrial automation, building controls, and human-machine interface (HMI) equipment where deterministic interrupt latency and rich connectivity are required.
Key features of the R5F56216BDFB include 100 MHz maximum operating frequency, 165 DMIPS at 1.25 DMIPS/MHz, hardware multiply/divide and FPU support, 256 KB Flash program memory, 64 KB SRAM, USB 2.0 Host/Function Controller, CAN interface, 10-bit A/D converter, multifunction timer (MTU2), DMA controller (DMAC/DTC), and a wide operating voltage range suitable for 3.3 V systems. The 144-pin LFQFP package provides ample I/O for parallel buses and external memory interfaces.
Architecturally, the RX621 uses a 5-stage pipeline Harvard architecture with separate instruction and data buses, integrated FPU for IEEE-754 single-precision operations, a dedicated flash access accelerator, and 16 KB of user-accessible data flash. The integrated peripheral bridge supports up to 123 I/O lines along with rich serial channels including SCI (UART/IrDA/I2C), RSPI, and the USB 2.0 Host controller with embedded PHY.
Typical applications include industrial serial-to-Ethernet gateways, building automation controllers, USB host devices such as printers and POS terminals, factory automation PLCs, and consumer devices requiring both Ethernet and CAN connectivity. The wide operating voltage and temperature range also suit HVAC and motor-control peripherals.
When designing with this part, ensure the USB PHY reference resistor and decoupling follow the datasheet reference design, and that firmware uses the on-chip flash-access accelerator to keep interrupt latency well below 1 us at 100 MHz operation.
Drop-in alternatives for R5F56216BDFB — 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 R5F56216BDFB (same form factor and footprint) — differing in Core Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
R5F56217BDFB
✅ Drop-In📋 Reference alternative (not in catalog)
R5F562N7BDFB
✅ Drop-In📋 Reference alternative (not in catalog)
R5F56216BDFP#V0
✅ Drop-In📋 Reference alternative (not in catalog)
R5F56216BDFB#10
✅ Drop-In📋 Reference alternative (not in catalog)
R5F56216BDLK#V0
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
R5F56216BDFB Maximum Ratings & Electrical Characteristics
| Core Architecture | RXv1 32-bit RISC with FPU |
| Maximum Clock Frequency | 100 MHz |
| DMIPS Performance | 165 DMIPS |
| Program Flash | 256 KB (256K x 8) |
| SRAM | 64 KB |
| Supply Voltage | 2.7 V to 3.6 V |
| I/O Pins | 123 |
| USB | USB 2.0 Host/Function Controller |
| CAN | Yes (CAN 2.0B) |
| A/D Converter | 10-bit |
| Timer | MTU2 (Multi-Function Timer Pulse Unit) |
| DMA | DMAC + DTC |
| Operating Temperature | -40 C to +85 C |
| Package | 144-LFQFP (20x20 mm) |
| Mounting Type | Surface Mount |
| Flash Access Accelerator | Yes (on-chip) |
| Lead-Free / RoHS | Yes / Compliant |
R5F56216BDFB Pin Configuration
| Pin 1 | VSS — Digital ground |
| Pin 2 | P40/AN000 — Port 4 / ADC input |
| Pin 3 | P41/AN001 — Port 4 / ADC input |
| Pin 4 | P42/AN002 — Port 4 / ADC input |
| Pin 5 | P43/AN003 — Port 4 / ADC input |
| Pin 6 | AVSS — Analog ground |
| Pin 7 | P44/AN004 — Port 4 / ADC input |
| Pin 8 | P45/AN005 — Port 4 / ADC input |
| Pin 9 | P46/AN006 — Port 4 / ADC input |
| Pin 10 | P47/AN007 — Port 4 / ADC input |
| Pin 11 | AVCC — Analog supply 3.3 V |
| Pin 12 | VREF — ADC reference voltage |
| Pin 13 | P50/RXD0 — Port 5 / SCI0 RXD |
| Pin 14 | P51/TXD0 — Port 5 / SCI0 TXD |
| Pin 15 | P52/SCK0 — Port 5 / SCI0 clock |
| Pin 16 | P53 — Port 5 |
| Pin 17 | VCC — Digital supply 3.3 V |
| Pin 18 | VSS — Digital ground |
| Pin 19 | P54 — Port 5 |
| Pin 20 | P55 — Port 5 |
| Pin 21 | P56 — Port 5 |
| Pin 22 | P57 — Port 5 |
| Pin 23 | P60 — Port 6 (external bus lower byte) |
| Pin 24 | P61 — Port 6 |
| Pin 25 | P62 — Port 6 |
| Pin 26 | P63 — Port 6 |
| Pin 27 | P64 — Port 6 |
| Pin 28 | P65 — Port 6 |
| Pin 29 | P66 — Port 6 |
| Pin 30 | P67 — Port 6 |
| Pin 31 | P70 — Port 7 (external bus) |
| Pin 32 | P71 — Port 7 |
| Pin 33 | P72 — Port 7 |
| Pin 34 | P73 — Port 7 |
| Pin 35 | P74 — Port 7 |
| Pin 36 | P75 — Port 7 |
| Pin 37 | P76 — Port 7 |
| Pin 38 | P77 — Port 7 |
| Pin 39 | P80 — Port 8 (external bus) |
| Pin 40 | P81 — Port 8 |
| Pin 41 | P82 — Port 8 |
| Pin 42 | P83 — Port 8 |
| Pin 43 | P84 — Port 8 |
| Pin 44 | P85 — Port 8 |
| Pin 45 | P86 — Port 8 |
| Pin 46 | P87 — Port 8 |
| Pin 47 | P90 — Port 9 |
| Pin 48 | P91 — Port 9 |
| Pin 49 | P92 — Port 9 |
| Pin 50 | P93 — Port 9 |
| Pin 51 | P94 — Port 9 |
| Pin 52 | P95 — Port 9 |
| Pin 53 | P96 — Port 9 |
| Pin 54 | P97 — Port 9 |
| Pin 55 | PA0/A0 — Port A / address bus |
| Pin 56 | PA1/A1 — Port A |
| Pin 57 | PA2/A2 — Port A |
| Pin 58 | PA3/A3 — Port A |
| Pin 59 | PA4/A4 — Port A |
| Pin 60 | PA5/A5 — Port A |
| Pin 61 | PA6/A6 — Port A |
| Pin 62 | PA7/A7 — Port A |
| Pin 63 | PB0/A8 — Port B / address bus |
| Pin 64 | PB1/A9 — Port B |
| Pin 65 | PB2/A10 — Port B |
| Pin 66 | PB3/A11 — Port B |
| Pin 67 | PB4/A12 — Port B |
| Pin 68 | PB5/A13 — Port B |
| Pin 69 | PB6/A14 — Port B |
| Pin 70 | PB7/A15 — Port B |
| Pin 71 | PC0/A16 — Port C / address bus |
| Pin 72 | PC1/A17 — Port C |
| Pin 73 | PC2/A18 — Port C |
| Pin 74 | PC3/A19 — Port C |
| Pin 75 | PC4/A20 — Port C |
| Pin 76 | PC5/A21 — Port C |
| Pin 77 | PC6/CS0 — Port C / chip-select 0 |
| Pin 78 | PC7/CS1 — Port C / chip-select 1 |
| Pin 79 | PD0/D0 — Port D / data bus |
| Pin 80 | PD1/D1 — Port D |
| Pin 81 | PD2/D2 — Port D |
| Pin 82 | PD3/D3 — Port D |
| Pin 83 | PD4/D4 — Port D |
| Pin 84 | PD5/D5 — Port D |
| Pin 85 | PD6/D6 — Port D |
| Pin 86 | PD7/D7 — Port D |
| Pin 87 | PE0/D8 — Port E / data bus upper |
| Pin 88 | PE1/D9 — Port E |
| Pin 89 | PE2/D10 — Port E |
| Pin 90 | PE3/D11 — Port E |
| Pin 91 | PE4/D12 — Port E |
| Pin 92 | PE5/D13 — Port E |
| Pin 93 | PE6/D14 — Port E |
| Pin 94 | PE7/D15 — Port E |
| Pin 95 | PF0 — Port F |
| Pin 96 | PF1 — Port F |
| Pin 97 | PF2 — Port F |
| Pin 98 | PF3 — Port F |
| Pin 99 | PF4 — Port F |
| Pin 100 | PF5 — Port F |
| Pin 101 | PF6 — Port F |
| Pin 102 | PF7 — Port F |
| Pin 103 | P00 — Port 0 |
| Pin 104 | P01 — Port 0 |
| Pin 105 | P02 — Port 0 |
| Pin 106 | P03 — Port 0 |
| Pin 107 | P10 — Port 1 (interrupt / SCI) |
| Pin 108 | P11 — Port 1 |
| Pin 109 | P12 — Port 1 |
| Pin 110 | P13 — Port 1 |
| Pin 111 | P14 — Port 1 |
| Pin 112 | P15 — Port 1 |
| Pin 113 | P16 — Port 1 |
| Pin 114 | P17 — Port 1 |
| Pin 115 | P20 — Port 2 (USB D+/D- etc.) |
| Pin 116 | P21 — Port 2 |
| Pin 117 | P22 — Port 2 |
| Pin 118 | P23 — Port 2 |
| Pin 119 | P24 — Port 2 |
| Pin 120 | P25 — Port 2 |
| Pin 121 | P26 — Port 2 |
| Pin 122 | P27 — Port 2 |
| Pin 123 | P30 — Port 3 (CAN etc.) |
| Pin 124 | P31 — Port 3 |
| Pin 125 | P32 — Port 3 |
| Pin 126 | P33 — Port 3 |
| Pin 127 | P34 — Port 3 |
| Pin 128 | P35 — Port 3 |
| Pin 129 | P36 — Port 3 |
| Pin 130 | P37 — Port 3 |
| Pin 131 | RES# — Reset input (active-low) |
| Pin 132 | XTAL/EXTAL — Crystal oscillator pins |
| Pin 133 | VSS — Digital ground |
| Pin 134 | XIN/XOUT — Low-speed crystal / EXTAL2 |
| Pin 135 | PLLVCC — PLL supply |
| Pin 136 | VCC — Digital supply 3.3 V |
| Pin 137 | USBVBUS — USB VBUS detect |
| Pin 138 | USBDP — USB D+ |
| Pin 139 | USBDM — USB D- |
| Pin 140 | VSS_USB — USB ground |
| Pin 141 | MD — Mode pin (boot select) |
| Pin 142 | EMLE — Emulator enable |
| Pin 143 | TRST# — JTAG reset |
| Pin 144 | TDO/TDI/TMS/TCK — JTAG I/O + VSS (multiple test pins) |
Typical Applications
R5F56216BDFB is suitable for 6 applications: Industrial Serial-to-Ethernet Gateway, USB Host Printer / POS Terminal, Building Automation Controller, Factory Automation PLC / Remote I/O, HVAC and Motor Control Peripheral, Human-Machine Interface (HMI) Panel.
Industrial Serial-to-Ethernet Gateway
The R5F56216BDFB's 100 MHz RXv1 core delivers 165 DMIPS, sufficient for protocol conversion between RS-485, RS-232, and TCP/IP stacks. With 256 KB flash it comfortably fits lwIP or uIP plus Modbus RTU/TCP libraries. The 64 KB SRAM buffers multiple TCP sockets without external memory, and the 144-LFQFP pinout exposes SCI channels (UART) for legacy fieldbus. Designers should migrate to R5F562N7BDFB when on-chip Ethernet is required - that variant is pin-compatible and adds the Ethernet MAC without a footprint change.
Recommended
USB Host Printer / POS Terminal
Integrated USB 2.0 Host/Function Controller with on-chip PHY eliminates external PHY cost on the R5F56216BDFB. Printing-class drivers and HID-class stacks fit easily into the 256 KB flash. Pair the MCU with a USB power-switch IC and protection diode as required by the USB 2.0 specification. The 10-bit A/D converter and the MTU2 timers handle paper-feed motor control (PWM) and temperature sensing in print-head designs. In retail POS terminals, the CAN peripheral can interface with payment terminal modules or scale peripherals.
Recommended
Building Automation Controller
Building automation requires deterministic real-time response, and the R5F56216BDFB's 100 MHz RXv1 core plus on-chip flash accelerator delivers deterministic low-latency interrupt response typical below 1 us. Peripherals such as the MTU2 timers provide 16-bit PWM for lighting control, while the 10-bit A/D reads temperature and light sensors. The SCI interfaces are typically used for Modbus RTU to HVAC field devices, and CAN can connect to BACnet gateways or smart-metering equipment. Wide operating voltage (2.7-3.6 V) tolerates noisy industrial 24V->3.3 V supply rails with proper filtering.
Recommended
Factory Automation PLC / Remote I/O
For factory automation PLCs and remote I/O modules, the R5F56216BDFB's CAN 2.0B provides deterministic industrial networking. The RXv1 core's hardware FPU accelerates PID loops running in firmware, while the DMAC offloads ADC-triggered data movement. 123 I/O lines support dense digital I/O arrays without external mux chips. The wide operating temperature range (-40 C to +85 C) suits IP20-PLC cabinet environments, and the 144-LFQFP pinout allows direct interface to 24 V optically-isolated I/O. Engineers commonly pair this MCU with opto-isolated digital I/O and CAN transceivers.
Recommended
HVAC and Motor Control Peripheral
HVAC and motor-control peripherals benefit from the R5F56216BDFB's MTU2 multi-function timer with complementary PWM outputs and dead-time generators - directly driving three-phase inverters or BLDC motors. The hardware FPU handles Park/Clarke transforms for field-oriented control, while 10-bit A/D reads phase currents from shunt resistors. CAN network capability supports integration with HVAC controllers, and 123 I/O give headroom for keypad, display, and sensor interfaces. The device operates reliably across industrial temperature ranges (up to +85 C) commonly encountered in boiler rooms and outdoor equipment.
Recommended
Human-Machine Interface (HMI) Panel
HMI panels benefit from the R5F56216BDFB's combination of memory, processing speed, and rich peripheral set. The 100 MHz core drives TFT-LCD controllers via parallel RGB or external display bridges, while 256 KB flash stores UI assets and translations. SCI handles RS-232 / RS-485 host interfaces, and CAN enables communication with PAC/PLC controllers. The MTU2 timers backlight-dimming PWM and buzzer control. Choose the R5F56217BDFB if your GUI assets exceed 256 KB; for panel designs needing direct Ethernet connection to industrial networks, drop in the R5F562N7BDFB without PCB rework.
Recommended
Recommended Products Summary
Engineering reference data for R5F56216BDFB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | R5F56217BDFB | R5F562N7BDFB | R5F56216BDFP#V0 |
|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 144-LFQFP (20x20 mm) | 144-LFQFP (20x20 mm) - same | 144-LFQFP (20x20 mm) - same | 144-LFQFP (20x20 mm) - same |
| Core | RXv1 32-bit 100 MHz | RXv1 32-bit 100 MHz - same | RXv1 32-bit 100 MHz - same | RXv1 32-bit 100 MHz - same |
| Flash | 256 KB | Higher density variant (RX621/RX62N family) | Same density, with Ethernet | 256 KB |
| SRAM | 64 KB | 64 KB (same) | 64 KB (same) | 64 KB |
| Ethernet MAC | No | No | Yes (on-chip Ethernet MAC) | No |
| USB 2.0 Host/Function | Yes | Yes | Yes | Yes |
| CAN | Yes (CAN 2.0B) | Yes | Yes | Yes |
| A/D Converter | 10-bit | 10-bit | 10-bit | 10-bit |
| Operating Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| I/O Pins | 123 | 123 | 123 | 123 |
| Unit Price (qty 1, as of 2026-10-10) | USD 9.80 | USD 10.20 (approximate) | USD 11.50 (approximate) | USD 9.80 (same) |
Key Differentiators
- Balanced 100 MHz CPU with rich industrial connectivity (vs PIC32MX550F256L-I/PT)
- On-chip FPU accelerates closed-loop control (vs R5F2135CCNFP (Renesas R8C series))
- Drop-in Ethernet upgrade via R5F562N7BDFB (vs R5F56216BDFB (this part))
Design Notes
The R5F56216BDFB operates on a single 2.7-3.6 V supply rail. Place a 10 uF bulk capacitor on VCC/AVCC as close to the IC as possible, plus 0.1 uF and 1 nF decoupling on each supply pin pair to suppress high-frequency switching noise. The USB VBUS pin requires its own decoupling per the USB 2.0 reference design. Per Renesas hardware manual, the analog supply and reference (AVCC/VREF) should be isolated from the digital supply by a ferrite bead or RC filter to keep ADC noise low.
Estimated: at 100 MHz CPU clock drawing approximately 80 mA and a typical supply of 3.3 V, total power dissipation is on the order of 265 mW. The 144-LFQFP package has theta_JA around 45 C/W (per LFQFP-144 family data), so junction temperature rise above ambient is roughly 12 C - no heatsink required in industrial enclosures. However, in tightly enclosed IP20 cabinets without airflow, derate operating temperature to 70 C ambient. Place the exposed pad to the ground pour with multiple thermal vias for additional margin.
Follow the Renesas reference layout for the 144-LFQFP package: keep the MCU-side crystal traces short and guard them with a ground ring. The USB D+/D- traces should be 90 ohm differential and length-matched within 2 mm; place the common-mode choke within 5 mm of the MCU pins. The CAN bus requires 120-ohm termination at each end of the bus, with the bus stub from the CAN transceiver to the MCU as short as possible (less than 25 mm). Add a guard ring around analog signals with continuous ground isolation.
Do not drive the MD (Mode) pin at boot mode without verifying firmware boot behavior - wrong mode settings can lock the part. The reset (RES#) pin is active-low and must be held low for at least the minimum reset pulse width per the datasheet. The USB bus must see a clean VBUS detect signal; failure to debounce the VBUS sense pin can cause USB enumeration failures. Always use the Renesas flash programmer or e2 studio to erase the device before programming, since incorrect lock bit configuration can brick the device.
Place external bypass capacitors as close to each supply pin as physically possible (recommended within 3 mm). Use a ground-fill on both top and bottom layers stitched with multiple vias. Route analog signals away from high-speed switching signals (SCI/UART and PWM). For USB, maintain continuous reference plane beneath the USB D+/D- pair; never split the plane. For external bus interfaces (D0-D31, A0-A21, CS0-CS7), match trace lengths within group to minimize skew.
Compliance Information
Renesas RX621 family is RoHS and REACH compliant per the Renesas product page; lead-free / halogen-free on the #V0 and #10 variants. Standard R5F56216BDFB family is not AEC-Q100 qualified - select R5F56216BDFP#V0 for industrial extended temperature. AEC-Q100 automotive variants are typically named under the RH850 family.
