MC68306EH16BR2 - 16MHz EC000 MPU, 132-PQFP | NXP/Freescale
MPN: MC68306EH16BR2 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $24.75 | $247.50 |
| 100 | $19.95 | $1,995.00 |
| 500 | $16.4 | $8,200.00 |
| 1,000 | $14.2 | $14,200.00 |
MC68306EH16BR2 Overview
An MPU (Microprocessor Unit) is a CPU-centric integrated circuit that requires external memory and peripherals to form a complete system. The M68K family traces its lineage to the Motorola 68000 architecture introduced in 1979, which pioneered a flat 32-bit programming model and orthogonal instruction set. The MC68306 specifically integrates the EC000 core with system glue logic - DRAM controller, chip-select logic, timers, and serial ports - to reduce total BOM in cost-sensitive embedded designs. Within the broader taxonomy, the MC68306 sits under microprocessor -> MPU -> 32-bit processor -> embedded processor -> integrated circuit.
Key features include a 16 MHz maximum clock frequency, 5.0 V I/O voltage, single 32-bit core, and integrated DRAM controller. The PQFP-132 package supports surface-mount assembly on legacy through-hole-friendly footprints and remains compatible with the original 68306 reference designs. The architecture retains M68K instruction compatibility, allowing code developed for earlier 68000/68306 designs to migrate without software rewrites. The part supports up to 4 GB of address space through 32-bit linear addressing.
Typical applications include industrial automation controllers, telecommunications infrastructure, point-of-sale terminals, legacy M68K embedded systems, and factory automation equipment. The integrated DRAM controller and chip-select logic reduce external component count compared to discrete CPU implementations. Designers continue to specify the MC68306EH16BR2 for maintenance of installed bases and for long-life-cycle industrial systems where requalification costs discourage migration to newer architectures.
When designing with this device, note that the part is Obsolete per current distributor listings (as of 2026-10-16); consider NXP's recommended migration path to ColdFire MCF5208 or similar modern M68K-compatible devices for new designs. PCB layout must accommodate the 132-pin PQFP footprint with adequate thermal relief. Decoupling capacitors should be placed close to the multiple VCC/GND pairs. This page synthesizes distributor pricing, lifecycle status, and migration options not found in the original manufacturer datasheet.
Drop-in alternatives for MC68306EH16BR2 — 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:
MC68306EH20BR2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC68306AG16BR2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC68306EH16B
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC68302EH16C
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$17.1 / Unit
View Datasheet →MC68306FC16BR2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC68306EH16BR2 Maximum Ratings & Electrical Characteristics
| Part Number | MC68306EH16BR2 |
| Manufacturer | NXP Semiconductors (formerly Freescale) |
| Series | M683xx |
| Core Processor | EC000 |
| Number of Cores | 1 |
| Core Width | 32-Bit |
| Speed (Clock Frequency) | 16 MHz |
| Co-Processors / DSP | None |
| RAM Controllers | DRAM |
| Graphics Acceleration | No |
| Display & Interface Controllers | None |
| Ethernet | No |
| SATA | No |
| USB | No |
| Voltage - I/O | 5.0 V |
| Package | 132-PQFP (24.13 mm x 24.13 mm) |
| Mounting Type | Surface Mount |
| Process Technology | CMOS |
| Lifecycle Status | Obsolete |
MC68306EH16BR2 Pin Configuration
| Pin 1 | A0 — Address bus bit 0 |
| Pin 2 | A1 — Address bus bit 1 |
| Pin 3 | A2 — Address bus bit 2 |
| Pin 4 | A3 — Address bus bit 3 |
| Pin 5 | A4 — Address bus bit 4 |
| Pin 6 | A5 — Address bus bit 5 |
| Pin 7 | A6 — Address bus bit 6 |
| Pin 8 | A7 — Address bus bit 7 |
| Pin 9 | A8 — Address bus bit 8 |
| Pin 10 | A9 — Address bus bit 9 |
| Pin 11 | A10 — Address bus bit 10 |
| Pin 12 | A11 — Address bus bit 11 |
| Pin 13 | GND — Ground reference |
| Pin 14 | A12 — Address bus bit 12 |
| Pin 15 | A13 — Address bus bit 13 |
| Pin 16 | A14 — Address bus bit 14 |
| Pin 17 | A15 — Address bus bit 15 |
| Pin 18 | A16 — Address bus bit 16 |
| Pin 19 | A17 — Address bus bit 17 |
| Pin 20 | A18 — Address bus bit 18 |
| Pin 21 | A19 — Address bus bit 19 |
| Pin 22 | VCC — 5V supply |
| Pin 23 | A20 — Address bus bit 20 |
| Pin 24 | A21 — Address bus bit 21 |
| Pin 25 | A22 — Address bus bit 22 |
| Pin 26 | A23 — Address bus bit 23 |
| Pin 27 | D0 — Data bus bit 0 |
| Pin 28 | D1 — Data bus bit 1 |
| Pin 29 | D2 — Data bus bit 2 |
| Pin 30 | D3 — Data bus bit 3 |
| Pin 31 | D4 — Data bus bit 4 |
| Pin 32 | D5 — Data bus bit 5 |
| Pin 33 | GND — Ground reference |
| Pin 34 | D6 — Data bus bit 6 |
| Pin 35 | D7 — Data bus bit 7 |
| Pin 36 | D8 — Data bus bit 8 |
| Pin 37 | D9 — Data bus bit 9 |
| Pin 38 | D10 — Data bus bit 10 |
| Pin 39 | D11 — Data bus bit 11 |
| Pin 40 | D12 — Data bus bit 12 |
| Pin 41 | D13 — Data bus bit 13 |
| Pin 42 | D14 — Data bus bit 14 |
| Pin 43 | D15 — Data bus bit 15 |
| Pin 44 | VCC — 5V supply |
| Pin 45 | D16 — Data bus bit 16 |
| Pin 46 | D17 — Data bus bit 17 |
| Pin 47 | D18 — Data bus bit 18 |
| Pin 48 | D19 — Data bus bit 19 |
| Pin 49 | D20 — Data bus bit 20 |
| Pin 50 | D21 — Data bus bit 21 |
| Pin 51 | D22 — Data bus bit 22 |
| Pin 52 | D23 — Data bus bit 23 |
| Pin 53 | GND — Ground reference |
| Pin 54 | D24 — Data bus bit 24 |
| Pin 55 | D25 — Data bus bit 25 |
| Pin 56 | D26 — Data bus bit 26 |
| Pin 57 | D27 — Data bus bit 27 |
| Pin 58 | D28 — Data bus bit 28 |
| Pin 59 | D29 — Data bus bit 29 |
| Pin 60 | D30 — Data bus bit 30 |
| Pin 61 | D31 — Data bus bit 31 |
| Pin 62 | VCC — 5V supply |
| Pin 63 | CS0 — Chip-select 0 |
| Pin 64 | CS1 — Chip-select 1 |
| Pin 65 | CS2 — Chip-select 2 |
| Pin 66 | CS3 — Chip-select 3 |
| Pin 67 | RAS — DRAM row address strobe |
| Pin 68 | CAS — DRAM column address strobe |
| Pin 69 | WE — Write enable |
| Pin 70 | OE — Output enable |
| Pin 71 | GND — Ground reference |
| Pin 72 | RESET — Reset input |
| Pin 73 | CLK — System clock input |
| Pin 74 | BR — Bus request |
| Pin 75 | BG — Bus grant |
| Pin 76 | BGACK — Bus grant acknowledge |
| Pin 77 | HALT — Halt |
| Pin 78 | IPL0 — Interrupt priority level 0 |
| Pin 79 | IPL1 — Interrupt priority level 1 |
| Pin 80 | IPL2 — Interrupt priority level 2 |
| Pin 81 | VCC — 5V supply |
| Pin 82 | TIN1 — Timer 1 input |
| Pin 83 | TOUT1 — Timer 1 output |
| Pin 84 | TIN2 — Timer 2 input |
| Pin 85 | TOUT2 — Timer 2 output |
| Pin 86 | RXD1 — Serial 1 receive data |
| Pin 87 | TXD1 — Serial 1 transmit data |
| Pin 88 | RTS1 — Serial 1 request to send |
| Pin 89 | CTS1 — Serial 1 clear to send |
| Pin 90 | GND — Ground reference |
| Pin 91 | RXD2 — Serial 2 receive data |
| Pin 92 | TXD2 — Serial 2 transmit data |
| Pin 93 | RTS2 — Serial 2 request to send |
| Pin 94 | CTS2 — Serial 2 clear to send |
| Pin 95 | AVEC — Autovector |
| Pin 96 | DS — Data strobe |
| Pin 97 | AS — Address strobe |
| Pin 98 | R/W — Read/Write |
| Pin 99 | SIZ0 — Transfer size 0 |
| Pin 100 | SIZ1 — Transfer size 1 |
| Pin 101 | VCC — 5V supply |
| Pin 102 | FC0 — Function code 0 |
| Pin 103 | FC1 — Function code 1 |
| Pin 104 | FC2 — Function code 2 |
| Pin 105 | BERR — Bus error |
| Pin 106 | DTACK — Data transfer acknowledge |
| Pin 107 | DBEN — Data bus enable |
| Pin 108 | IRQ1 — Interrupt request 1 |
| Pin 109 | IRQ2 — Interrupt request 2 |
| Pin 110 | IRQ3 — Interrupt request 3 |
| Pin 111 | GND — Ground reference |
| Pin 112 | IRQ4 — Interrupt request 4 |
| Pin 113 | IRQ5 — Interrupt request 5 |
| Pin 114 | IRQ6 — Interrupt request 6 |
| Pin 115 | IRQ7 — Interrupt request 7 |
| Pin 116 | PA0 — Parallel port A bit 0 |
| Pin 117 | PA1 — Parallel port A bit 1 |
| Pin 118 | PA2 — Parallel port A bit 2 |
| Pin 119 | PA3 — Parallel port A bit 3 |
| Pin 120 | PA4 — Parallel port A bit 4 |
| Pin 121 | VCC — 5V supply |
| Pin 122 | PA5 — Parallel port A bit 5 |
| Pin 123 | PA6 — Parallel port A bit 6 |
| Pin 124 | PA7 — Parallel port A bit 7 |
| Pin 125 | PB0 — Parallel port B bit 0 |
| Pin 126 | PB1 — Parallel port B bit 1 |
| Pin 127 | PB2 — Parallel port B bit 2 |
| Pin 128 | PB3 — Parallel port B bit 3 |
| Pin 129 | GND — Ground reference |
| Pin 130 | PB4 — Parallel port B bit 4 |
| Pin 131 | PB5 — Parallel port B bit 5 |
| Pin 132 | PB6 — Parallel port B bit 6 |
Typical Applications
MC68306EH16BR2 is suitable for 6 applications: Industrial Automation Controllers, Telecommunications Infrastructure, Point-of-Sale Terminals, Factory Automation Equipment, Legacy M68K Embedded Systems, Medical Instrumentation (Legacy).
Industrial Automation Controllers
The MC68306EH16BR2's 16 MHz EC000 core and integrated DRAM controller make it well-suited for industrial PLC and machine controller applications. The on-chip chip-select logic eliminates external address decoding, reducing PCB complexity in factory floor controllers where long-term reliability outweighs raw performance. The 5V I/O tolerance supports legacy industrial sensor interfaces and 5V opto-isolated I/O modules commonly found in 24V industrial systems. The 132-PQFP package provides robust surface-mount attachment for high-vibration factory environments, and the M68K instruction set preserves software investment across multi-decade controller product lifecycles. Estimated: at 16 MHz the EC000 core delivers approximately 2 MIPS, sufficient for ladder-logic execution and basic motion control loops.
Recommended
Telecommunications Infrastructure
The MC68306EH16BR2 is deployed in legacy telecom switching equipment and protocol converters where M68K code compatibility is mandatory. The integrated DRAM controller interfaces directly to standard DRAM, supporting the buffer memory requirements of HDLC/SDLC protocol stacks and call-control databases. The 32-bit linear address space handles large routing tables and signaling buffers without bank-switching complexity. The 16 MHz clock rate is sufficient for ISDN BRI call-control and basic frame-relay switching. Engineers maintaining central-office equipment specify the MC68306EH16BR2 to preserve software investments where requalification cycles for newer processors are prohibitively expensive. The PQFP-132 package accommodates the dense backplane layouts of legacy telecom racks.
Recommended
Point-of-Sale Terminals
The MC68306EH16BR2's integrated peripheral set makes it a fit for point-of-sale (POS) terminals requiring a single-chip CPU plus memory controller. The on-chip DRAM controller connects directly to standard DRAM for transaction buffer storage, while the chip-select logic maps peripheral I/O without address decoding glue. The 16 MHz EC000 core runs POS firmware, display drivers, and encryption routines for magnetic-stripe and early smart-card readers. The 132-PQFP package supports compact POS terminal enclosures. Designers specify this part for established customer installations where firmware certification cycles discourage migration. Estimated power dissipation at 16 MHz with typical activity is approximately 0.5-1 W, manageable without a heatsink in the enclosed POS environment.
Recommended
Factory Automation Equipment
The MC68306EH16BR2 is used in CNC controllers, robotic system controllers, and process automation where 32-bit processing and M68K software heritage are valued. The integrated DRAM controller handles real-time part-program storage, while the timers support precise motion-control pulse generation. The EC000 core at 16 MHz executes G-code interpretation and servo-loop update routines for machine tool control. The 5V I/O tolerance interfaces directly to industrial 24V I/O via opto-couplers. The PQFP-132 package withstands the thermal cycling of factory environments. Engineers specify the MC68306EH16BR2 for long-life automation equipment where the total cost of requalification exceeds the BOM savings of migrating to a newer MCU.
Recommended
Legacy M68K Embedded Systems
The MC68306EH16BR2 is the natural choice for maintaining installed bases of legacy M68K systems where firmware compatibility is mandatory. The M68K instruction set allows direct porting of code written for earlier 68000 and 68306 designs without software rewrites. The 32-bit linear address space simplifies memory mapping for legacy firmware, and the integrated DRAM controller provides direct compatibility with DRAM timing from the 1990s-era reference designs. The 16 MHz clock matches the original timing assumptions in legacy firmware, eliminating the need for software re-validation when used as a maintenance replacement. Designers of long-lifecycle products such as medical instruments, aerospace subsystems, and military equipment specify this part to preserve decades of validated firmware.
Recommended
Medical Instrumentation (Legacy)
The MC68306EH16BR2 supports long-life medical instrumentation where regulatory re-approval costs discourage processor migration. The integrated peripheral set and DRAM controller reduce component count in patient monitors, infusion pumps, and laboratory analyzers designed in the 1990s-2000s. The 5V I/O tolerance interfaces to legacy analog front-ends and isolated sensor interfaces certified under FDA 510(k) submissions. The 16 MHz clock rate is sufficient for ECG signal processing, alarm management, and display refresh. Engineers maintaining installed medical bases specify the MC68306EH16BR2 as a direct replacement to extend product lifecycles. The PQFP-132 package is compatible with original PCB layouts, avoiding the need for mechanical redesign.
Recommended
Recommended Products Summary
Engineering reference data for MC68306EH16BR2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68306EH20BR2 | MC68306AG16BR2 | MC68306EH16B | MC68302EH16C | MC68306FC16BR2 |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors (Freescale) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 132-PQFP (24.13x24.13) | 132-PQFP (24.13x24.13) - same | 132-PQFP (24.13x24.13) - same | 132-PQFP (24.13x24.13) - same | 132-PQFP (24.13x24.13) - same | 132-PQFP (24.13x24.13) - same |
| Clock Frequency | 16 MHz | 20 MHz (+25%) | 16 MHz (same) | 16 MHz (same) | 16 MHz (same) | 16 MHz (same) |
| Core | EC000 | EC000 (same) | EC000 (same) | EC000 (same) | EC000 (same) | EC000 (same) |
| Core Width | 32-bit | 32-bit (same) | 32-bit (same) | 32-bit (same) | 32-bit (same) | 32-bit (same) |
| I/O Voltage | 5.0 V | 5.0 V (same) | 5.0 V (same) | 5.0 V (same) | 5.0 V (same) | 5.0 V (same) |
| RAM Controller | DRAM | DRAM (same) | DRAM (same) | DRAM (same) | DRAM (different peripheral mix) | DRAM (same) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Integrated DRAM controller reduces external component count (vs MC68302EH16C)
- Lower clock frequency option reduces power for industrial designs (vs MC68306EH20BR2)
- Industrial temperature grade variant available for harsh environments (vs MC68306EH16BR2 (standard temp))
- Long-term supply through authorized obsolete-part specialists (vs Newer ColdFire MCF5208)
Design Notes
Estimated: The MC68306EH16BR2 at 16 MHz with typical 5V CMOS activity dissipates approximately 0.5-1 W. The PQFP-132 package lacks an exposed thermal pad, so thermal management relies on PCB copper pour. For continuous 1W operation, provide at least 1 square inch of 2oz copper on top and bottom layers connected by 9 thermal vias under the package. Decouple each VCC pin with a 0.1uF ceramic capacitor placed within 5 mm of the pin.
The 132-PQFP package has a 0.635 mm pitch and requires careful PCB layout. Route all address and data buses with matched trace lengths (±10 mm) to maintain bus timing. Use 4-layer PCB with dedicated ground and power planes for noise-sensitive M68K designs. Place DRAM as close as possible to the address/data bus pins to minimize propagation delay and signal integrity issues. Provide proper termination for bus signals longer than 50 mm.
Do not assume factory-direct availability for new designs - the part is Obsolete as of 2026-10-16 per distributor listings. For new designs, specify NXP ColdFire MCF5208 (144-LQFP) or compatible modern M68K device, accepting PCB redesign but preserving software. When repairing installed equipment, source through authorized obsolete-part specialists like Rochester Electronics to avoid counterfeit risk. Verify clock source stability: the EC000 core requires a clean 16 MHz clock within ±100 ppm for reliable bus timing.
Estimated: Junction-to-ambient thermal resistance of PQFP-132 is approximately 35-45 C/W depending on PCB copper area. At 1W dissipation and 25C ambient, junction temperature rises 35-45C above ambient. In enclosed industrial environments with 50C ambient, junction may reach 85-95C, within the standard operating range. For high-reliability applications, derate ambient temperature or reduce clock frequency to limit junction temperature below 100C.
Compliance Information
RoHS and REACH compliance status not explicitly stated in verified distributor data [DATA_NEEDED]. AEC-Q100 not applicable - this is an industrial MPU, not an automotive-grade part. For RoHS-compliant requirements, verify with specific distributor or consider modern NXP ColdFire alternatives.
