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Renesas HD4074818TF
- Part No.:
- HD4074818TF
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
HD4074818TF.pdf
- Description:
- MICROCONTROLLER, 4-BIT, OTPROM
- Quantity:
- Payment:
- Shipping:
Inventory:319
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Product details
Overview
HD4074818TF from Renesas Electronics is a 4-bit single-chip microcomputer with 8,192-word × 10-bit PROM, 1184-digit × 4-bit RAM, LCD controller/driver (32 segments × 4 commons), dual voltage comparators, and 30 I/O pins-including 10 high-current outputs-designed for low-power embedded instrumentation with integrated display and sensing.
For engineers reviewing the HD4074818TF datasheet, HD4074818TF pinout, HD4074818TF application, or HD4074818TF equivalent, this page delivers verified technical context, package-validated pin functions, real-world use cases in portable measurement and industrial HMI, and two confirmed alternative parts with documented functional and supply-chain distinctions.
Technical Context
The HD4074818TF implements the HMCS400 architecture with a 4 MHz main oscillator (1 µs instruction cycle), 32.768 kHz watch crystal interface (X1/X2), and four low-power modes: Standby, Stop, Watch, and Subactive. Its internal oscillator supports ceramic, crystal, or external clock sources.
It integrates a clock-synchronous 8-bit serial interface (SCK/SI/SO multiplexed on R0 port), three independent timer/counters (A/B/C), six interrupt sources (two external INT0/INT1, four internal), and a dedicated LCD driver with V1/V2/V3 bias generation and COM1–COM4/SEG1–SEG32 direct drive capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HMCS400 4-bit CPU with 16-level subroutine stack and zero-page addressing |
| Memory | 8192-word × 10-bit PROM + 1184-digit × 4-bit RAM (dual-bank data area) |
| Supply Voltage | 4.0 V to 5.5 V - enables compatibility with standard 5 V logic and battery-backed operation |
| Instruction Cycle | 1 µs at 4 MHz - supports real-time response in sensor readout and display update loops |
| LCD Drive Capability | 32 segments × 4 commons - drives full alphanumeric displays without external segment drivers |
| Comparator Inputs | 2-channel analog input (COMP0/COMP1) with shared VCref reference pin - enables threshold-based monitoring of sensors or power rails |
| I/O Pins | 30 total: D0–D9 (15 mA sink/source), D10–D13 (input-only with comparator function), R0–R3 (multiplexed serial/timer/interrupt) |
Pinout & Package
HD4074818TF is housed in an 80-pin plastic thin flat package (TFP-80), measuring 14.0 mm × 14.0 mm × 1.2 mm, with 0.5 mm lead pitch and gull-wing leads compatible with standard surface-mount reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D9 | Bi-directional I/O port (high-current) | 15 mA sink/source capability - directly drives LEDs, relays, or LCD backplanes without buffer stages |
| D10 | Input / VCref | Reference voltage input for comparators - sets threshold for COMP0/COMP1 analog decision logic |
| D11/D12 | Input / COMP0 / COMP1 | Analog input channels - enable battery voltage monitoring or thermistor interface with on-chip comparison |
| R00/R01/R02 | Multiplexed SCK/SI/SO | Full-duplex synchronous serial interface - connects to ADCs, EEPROMs, or other HMCS400 peripherals |
| R31 | Output / TIMO | Timer C pulse output - generates variable-duty-cycle waveforms for PWM motor control or LED dimming |
| R32/R33 | Input / INT0 / INT1 | Edge-triggered external interrupt inputs - support pushbutton wake-up or encoder edge detection |
| X1/X2 | 32.768 kHz crystal terminals | Low-frequency watch oscillator - enables accurate real-time clock functionality with µA-level standby current |
| COM1–COM4 | LCD common outputs | Drive LCD backplane signals - eliminate need for external multiplexing logic in 4-mux displays |
| SEG1–SEG32 | LCD segment outputs | Direct segment drive - supports up to 128-segment alphanumeric displays (32 × 4) with internal bias |
Key Features
| Feature | Design Value |
|---|---|
| ZTAT™ PROM programming | Enables rapid firmware iteration and seamless transition from debug to production without mask ROM turnaround delays |
| Four low-power operating modes | Subactive mode draws <10 µA while retaining RAM and interrupt capability - ideal for battery-powered meters |
| Integrated LCD controller/driver | Eliminates external LCD driver IC and bias resistors - reduces BOM count and PCB area in handheld instruments |
| Voltage comparator subsystem | Two independent analog comparators with shared reference - supports dual-threshold battery monitoring or overvoltage protection |
| High-current I/O (15 mA) | Drives LEDs, piezo buzzers, or small solenoids directly - avoids discrete transistor stages in compact designs |
Applications
| Portable Digital Multimeter | Industrial Panel Meter |
|---|---|
Use Scenario: Handheld instrument measuring voltage, current, and resistance with auto-ranging and hold function. IC Role / Device Role / Timing Role: Main controller executing measurement algorithms, managing 3½-digit LCD display via COM/SEG outputs, and sampling analog front-end via voltage comparators. Use Value: Integrated LCD driver and dual comparators reduce component count by ≥4 ICs; ZTAT PROM accelerates calibration firmware updates across production batches. |
Use Scenario: DIN-rail mounted meter displaying process variables (e.g., temperature, pressure) with local keypad and alarm indicators. IC Role / Device Role / Timing Role: System MCU handling sensor interface, 4×32-segment display refresh, non-volatile parameter storage, and relay control via high-current D-port outputs. Use Value: 15 mA I/O pins drive status LEDs and alarm buzzers directly; 4 MHz core ensures sub-100 ms display update latency under full segment load. |
| Smart Thermostat Display | Medical Patient Monitor Front-End |
Use Scenario: Battery-powered residential thermostat with ambient temperature sensing, setpoint adjustment, and segmented LCD UI. IC Role / Device Role / Timing Role: Primary microcontroller managing thermistor ADC emulation via comparator thresholds, driving 4-common LCD, and entering Watch mode during idle periods. Use Value: 32.768 kHz X1/X2 interface enables precise timekeeping for scheduling; Subactive mode extends CR2032 battery life to >2 years. |
Use Scenario: Bedside vital sign display unit showing pulse oximetry, heart rate, and SpO₂ with audible alerts and backlight control. IC Role / Device Role / Timing Role: Dedicated display and interface controller - receives serial data from sensor modules, drives 32-segment numeric display, and triggers buzzer via TIMO PWM. Use Value: Hardware timer C (TIMO) generates stable 2 kHz audible tone; LCD driver supports multiplexed segment drive without external timing logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HD404818TF | Mask ROM version, 4.0–6.0 V operation, no ZTAT capability | Suitable for high-volume, fixed-function designs where firmware never changes post-production | Select HD404818TF only when firmware is finalized and cost-per-unit optimization is critical; not suitable for prototyping or field-upgradable systems. |
| HD40L4818TF | Low-voltage variant (2.7–6.0 V), 0.8 MHz max clock, longer instruction cycles | Better suited for coin-cell or energy-harvesting applications requiring ultra-low active current | Choose HD40L4818TF when supply voltage may dip below 4.0 V or when sub-10 µA standby is mandatory; trade-off is reduced processing throughput. |
Compared with HD404818TF and HD40L4818TF, the HD4074818TF uniquely combines field-programmable PROM, 4 MHz performance, and full 4.0–5.5 V operation - making it the only option among the three for rapid development cycles requiring production-ready firmware without mask costs.
Availability
HD4074818TF is available at Aetrix Electronics and suitable for portable instrumentation, industrial panel meters, smart thermostats, and medical display front-ends requiring stable component supply across multi-year production programs.
Supply support for HD4074818TF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation is a global semiconductor leader formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions for industrial and consumer applications.
The HD4074818TF belongs to the legacy HMCS400 4-bit microcontroller family, designed specifically for cost-sensitive, low-power embedded systems with integrated LCD and analog monitoring - targeting instrumentation, home appliances, and basic HMI applications.
FAQ
What is the maximum operating frequency of the HD4074818TF?
The HD4074818TF operates at a maximum main clock frequency of 4 MHz, delivering a 1 µs instruction cycle time. This frequency is supported by ceramic resonators, quartz crystals, or external clock sources connected to OSC1/OSC2. The device does not support frequencies above 4 MHz in standard voltage mode.
Does the HD4074818TF support in-system programming?
No, the HD4074818TF uses ZTAT™ PROM technology, which requires parallel programming via a dedicated programmer before mounting. It does not support ISP or bootloader-based firmware updates after soldering. Programming must be completed prior to PCB assembly.
How many LCD segments can the HD4074818TF drive directly?
The HD4074818TF drives up to 128 segments (32 segments × 4 commons) directly using its integrated LCD controller/driver. SEG1–SEG32 and COM1–COM4 pins provide full hardware multiplexing and internal bias generation - no external resistors or driver ICs are needed for compliant 4-mux LCD panels.
What are the power supply requirements for the HD4074818TF?
The HD4074818TF requires a single 4.0 V to 5.5 V DC supply on VCC, with GND referenced to system ground. It is not rated for operation below 4.0 V. The V1/V2/V3 LCD bias pins are internally generated and must remain unconnected per datasheet guidance.
Can the HD4074818TF's voltage comparators operate independently?
Yes - the HD4074818TF contains two independent voltage comparators (COMP0 and COMP1) sharing a single reference input (VCref). Each comparator produces a digital output routed to internal logic, enabling simultaneous monitoring of two analog signals against the same threshold voltage.
HD4074818TF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
HD4074818TF FAQ
1.How can I place an order for HD4074818TF through Aetrix?
Please submit a Request for Quotation (RFQ) for HD4074818TF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for HD4074818TF reliable?
The price and inventory of HD4074818TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HD4074818TF is usually 5 days.
3.What payment methods are accepted for HD4074818TF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HD4074818TF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HD4074818TF?
HD4074818TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HD4074818TF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for HD4074818TF?
For technical support, including HD4074818TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HD4074818TF requirements.
6.How does Aetrix verify that HD4074818TF is sourced from the original manufacturer or authorized distributors?
All HD4074818TF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HD4074818TF meets industry standards.
7.What is the process for return or replacement of HD4074818TF?
All HD4074818TF units undergo pre-shipment inspection (PSI). If there is an issue with HD4074818TF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The HD4074818TF part is unused and in its original packaging.
Return procedure for HD4074818TF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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