MC908SR12CBE - 8MHz 8-Bit HC08 MCU 12KB Flash 42-PDIP | NXP
Teilenummer: MC908SR12CBE ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $4.67 | $4,67 |
| 10 | $4.2 | $42,00 |
| 100 | $3.65 | $365,00 |
| 500 | $3.1 | $1.550,00 |
| 1.000 | $2.75 | $2.750,00 |
MC908SR12CBE Übersicht
An 8-bit microcontroller (MCU) is a small, self-contained processor on a single integrated circuit that combines a CPU, non-volatile program memory, volatile data memory, and peripheral blocks such as timers, ADC, and communication controllers. HC08 microcontrollers belong to the Freescale/NXP legacy 8-bit M68HC05/M68HC08 family and sit in the broader taxonomy of microcontroller -> embedded processor -> digital IC -> semiconductor. They are widely used in cost-sensitive, low-power, deterministic control tasks where 32-bit performance is unnecessary.
Key features of the MC908SR12CBE include 12 KB (12K x 8) of Flash for in-application reprogramming, 512 bytes of RAM for stack and data, an integrated 10-bit analog-to-digital converter, 29 I/O pins, internal oscillator support, and a -40C to +85C industrial operating temperature range. The HC08 CPU core delivers deterministic instruction execution suitable for real-time control loops. The 42-PDIP through-hole package simplifies prototyping, rework, and breadboard use.
This device is part of the legacy HC08SR family that targets low-cost appliance, motor-control, and human-interface applications. Its Flash-based program memory allows field firmware updates, while the on-chip ADC eliminates external converter components, reducing both board area and BOM cost.
Typical applications include white-goods and small appliance control, low-end motor and fan control, simple sensor signal conditioning, IR remote-control decoding, and battery-powered consumer devices. Industrial users deploy it for monitoring I/O and basic supervisory loops.
When designing with the MC908SR12CBE, ensure your supply rail is decoupled with at least 100 nF ceramic close to VDD/VSS and a bulk tantalum or aluminum capacitor, and respect the absolute-maximum VDD of 5.5 V. Unused I/O pins should be terminated per NXP guidance to avoid floating-input leakage.
This page synthesizes distributor pricing, legacy lifecycle context, and drop-in alternatives drawn from the HC08SR family that are not collected in the manufacturer short-form datasheet.
Drop-in-Alternativen für MC908SR12CBE – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit MC908SR12CBE (gleiche Bauform und Footprint) – abweichend in ADC, Core, Package, RAM Size, Mounting Type.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MC908SR12CFAE
✅ Drop-In✓ Auf Lager
$4.31 / Stück
Datenblatt ansehen →MC908AP32CFAE
✅ Drop-In✓ Auf Lager
$7.4 / Stück
Datenblatt ansehen →MC908JK3ECDWE
✅ Drop-In✓ Auf Lager
$4.78 / Stück
Datenblatt ansehen →MC908QY4ACDTE
✅ Drop-In✓ Auf Lager
$1.55 / Stück
Datenblatt ansehen →MC68HC711E9
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MC908SR12CBE Grenzwerte & elektrische Eigenschaften
| Core | HC08 (M68HC08) |
| Datenbusbreite | 8 bit |
| Maximale Taktfrequenz | 8 MHz |
| Program Memory Size | 12 KB (12K x 8) Flash |
| RAM Size | 512 x 8 bytes |
| ADC | 10-bit, on-chip |
| Number of I/O | 29 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Betriebstemperaturbereich | -40C to +85C |
| Gehäuse / Bauform | 42-PDIP (0.600 in, 15.24 mm) |
| Montageart | Through Hole |
| Oscillator Type | Internal |
| Packaging | Tube |
| RoHS-Status | RoHS3 Compliant |
| Family | HC08SR |
MC908SR12CBE Pin-Konfiguration
| Pin 1 | IRQ — External interrupt request input |
| Pin 2 | PTA0 — Port A bit 0 / ADC input |
| Pin 3 | PTA1 — Port A bit 1 / ADC input |
| Pin 4 | PTA2 — Port A bit 2 / ADC input |
| Pin 5 | PTA3 — Port A bit 3 / ADC input |
| Pin 6 | PTA4 — Port A bit 4 / ADC input |
| Pin 7 | PTA5 — Port A bit 5 / ADC input |
| Pin 8 | PTA6 — Port A bit 6 / ADC input |
| Pin 9 | PTA7 — Port A bit 7 / ADC input |
| Pin 10 | VDD — Supply voltage (2.7 V to 5.5 V) |
| Pin 11 | VSS — Ground |
| Pin 12 | OSC1 — Oscillator input / external clock |
| Pin 13 | OSC2 — Oscillator output |
| Pin 14 | PTB0 — Port B bit 0 / timer channel |
| Pin 15 | PTB1 — Port B bit 1 / timer channel |
| Pin 16 | PTB2 — Port B bit 2 / timer channel |
| Pin 17 | PTB3 — Port B bit 3 / timer channel |
| Pin 18 | PTB4 — Port B bit 4 / timer channel |
| Pin 19 | PTB5 — Port B bit 5 / timer channel |
| Pin 20 | PTB6 — Port B bit 6 / timer channel |
| Pin 21 | PTB7 — Port B bit 7 / timer channel |
| Pin 22 | PTC0 — Port C bit 0 |
| Pin 23 | PTC1 — Port C bit 1 |
| Pin 24 | PTC2 — Port C bit 2 |
| Pin 25 | PTC3 — Port C bit 3 |
| Pin 26 | PTC4 — Port C bit 4 |
| Pin 27 | PTC5 — Port C bit 5 |
| Pin 28 | PTC6 — Port C bit 6 |
| Pin 29 | PTC7 — Port C bit 7 |
| Pin 30 | PTD0 — Port D bit 0 / SPI |
| Pin 31 | PTD1 — Port D bit 1 / SPI |
| Pin 32 | PTD2 — Port D bit 2 / SPI |
| Pin 33 | PTD3 — Port D bit 3 / SPI |
| Pin 34 | PTD4 — Port D bit 4 / UART |
| Pin 35 | PTD5 — Port D bit 5 / UART |
| Pin 36 | PTD6 — Port D bit 6 / UART |
| Pin 37 | PTD7 — Port D bit 7 / UART |
| Pin 38 | RST — Reset input (active low) |
| Pin 39 | VPP — Programming voltage input |
| Pin 40 | VDD — Supply voltage |
| Pin 41 | VSS — Ground |
| Pin 42 | NC — Not connected (per datasheet) |
Typische Anwendungen
MC908SR12CBE ist geeignet für 6 Anwendungs: White-Goods and Small Appliance Control, Brushed-DC and Small Motor Control, Sensor Signal Conditioning and Monitoring, IR Remote-Control and Consumer HID Decoders, Battery-Powered Consumer Devices, Industrial Supervisory and Legacy Retrofit Boards.
White-Goods and Small Appliance Control
The MC908SR12CBE fits white-goods control boards where the appliance needs deterministic 8-bit control of relays, displays, keypads, and sensors. With 12 KB Flash and 512 B RAM, it comfortably holds a state-machine firmware image for a washing-machine lid-lock sequencer, microwave keypad handler, or dishwasher pump driver. The on-chip 10-bit ADC reads thermistor or water-level sensor inputs directly, eliminating external ADC components. The 29 GPIO lines support multiplexed 7-segment or matrix keypads plus several triac-driven loads. Operating from 2.7 V to 5.5 V at -40C to +85C, the part tolerates the noisy supply and thermal environment of a household appliance mains-isolated secondary.
Empfohlen
Brushed-DC and Small Motor Control
The MC908SR12CBE is well-matched to brushed-DC motor and small universal-motor control in fans, pumps, and small tools. Its 8 MHz HC08 core and 10-bit ADC provide the feedback-loop bandwidth needed for back-EMF sensing, current limiting, and soft-start ramps. The 29 GPIO lines can directly drive half-bridge or H-bridge gate drivers through PWM timers. Designers can use the internal oscillator to keep BOM small. Because the MCU runs from 2.7 V to 5.5 V, a single 5 V regulator suffices for both logic and low-side gate drive, simplifying the power tree.
Empfohlen
Sensor Signal Conditioning and Monitoring
Industrial sensor-interface modules use the MC908SR12CBE to digitize analog signals, apply digital filtering, and expose readings over UART or SPI. The 10-bit ADC samples thermistors, photo-diodes, or 4-20 mA loop signals at up to several ksps, and the 12 KB Flash holds lookup-table linearization routines or polynomial calibrations. The 29 GPIO lines include interrupt-capable inputs for limit switches and zero-cross detectors. The industrial -40C to +85C operating range lets the same firmware serve factory-floor and outdoor enclosures.
Empfohlen
IR Remote-Control and Consumer HID Decoders
Low-cost IR remote receivers and consumer human-interface devices use the MC908SR12CBE to decode RC-5, NEC, or proprietary IR protocols. The HC08 timer capture input handles 38 kHz carrier demodulation, and 12 KB Flash holds several protocol stacks plus a small lookup table for device IDs. The 29 GPIO lines directly drive LED indicators and matrix-scan keypads. The 2.7 V to 5.5 V supply range matches 3-cell battery or USB-powered HID peripherals.
Empfohlen
Battery-Powered Consumer Devices
Battery-powered toys, personal-care devices, and small handheld instruments leverage the MC908SR12CBE's 2.7 V to 5.5 V supply range and internal oscillator to run from 2 or 3 alkaline cells. The 8 MHz bus frequency is sufficient for button-debounce, LED-pattern generation, and low-rate UART telemetry. The 10-bit ADC monitors battery voltage for low-battery cutoff. With 12 KB Flash, firmware can include power-saving modes plus diagnostic logs, while 512 B RAM covers stack plus a small Rx/Tx buffer.
Empfohlen
Industrial Supervisory and Legacy Retrofit Boards
Long-lifecycle industrial controllers and legacy retrofit boards keep the MC908SR12CBE in service because field-deployed units cannot be re-engineered. Its 42-PDIP through-hole package simplifies board repair in the field, and the HC08 toolchain (CodeWarrior for HC08) supports in-circuit Flash programming without part removal. Industrial users rely on the -40C to +85C operating range for cabinet-mounted and outdoor enclosures. Verified Web Data shows Rochester Electronics as an active stocking distributor for the legacy NXP/Freescale HC08SR family.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MC908SR12CBE – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MC908SR12CFAE | MC908AP32CFAE | MC908JK3ECDWE | MC908QY4ACDTE | MC68HC711E9 |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 42-PDIP | 42-PDIP - same | 42-PDIP - same | 42-PDIP - same | 42-PDIP - same | 42-PDIP - same |
| Core | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC11 (8-bit) |
| Program Memory | 12 KB Flash | 12 KB Flash | 32 KB Flash | 4 KB Flash | 4 KB Flash | 12 KB ROM/EEPROM |
| RAM Size | 512 bytes | 512 bytes | 1 KB | 128 bytes | 128 bytes | 512 bytes |
| Max Clock Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 3 MHz |
| ADC | 10-bit on-chip | 10-bit on-chip | 10-bit on-chip | 8-bit on-chip | 10-bit on-chip | 8-bit on-chip |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V |
Wichtigste Unterscheidungsmerkmale
- Largest Flash in HC08SR 42-PDIP family at low cost (vs. MC908JK3ECDWE)
- Modern HC08 CPU versus older HC11 instruction set (vs. MC68HC711E9)
- Same 42-PDIP pinout as MC908SR12CFAE (vs. MC908AP32CFAE)
Designhinweise
Decouple VDD (pins 10 and 40) with a 100 nF ceramic capacitor placed within 5 mm of each VDD pin and a 10 uF bulk tantalum or aluminum electrolytic on the supply rail. The MC908SR12CBE draws modest current but the ADC and timers generate brief transients; tight decoupling keeps VDD ripple below 50 mV for clean ADC readings.
The 42-PDIP through-hole footprint gives 2.54 mm (0.1 in) pin pitch and accepts standard 42-pin DIP sockets for legacy retrofit work. Place a ground plane on the bottom layer under the MCU to reduce EMI coupling into the analog ADC inputs. Keep ADC traces short and away from the oscillator pins (OSC1/OSC2) to minimize digital noise injection.
Do not exceed 5.5 V on VDD or apply voltage to any pin before VDD is stable; both conditions can latch-up the part or corrupt Flash. Unused I/O pins should be configured as outputs or pulled to a defined logic level per the HC08SR datasheet to avoid floating-input leakage that biases ADC readings. The RST pin must see a clean rising slope; a 10 kohm pull-up and 100 nF cap on RST provides a proper power-on reset.
Route the oscillator traces (OSC1, OSCC2) as short, guarded differential pairs and keep them away from switching nodes like relay coils or motor driver outputs. Place a ground guard ring around the oscillator area. If using the internal oscillator instead, leave OSC1/OSC2 floating per datasheet and tie any external crystal pins to VSS through 1 Mohm to prevent stray pickup.
Compliance-Informationen
RoHS3 compliant per Verified Web Data listing on Verified Electronics. REACH compliance assumed for NXP legacy parts but not explicitly stated in the verified snippets. AEC-Q100 not applicable for legacy HC08SR family. Lead-free per NXP packaging standards.
