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STMicroelectronics M74HC4543RM13TR
- Part No.:
- M74HC4543RM13TR
- Manufacturer:
- STMicroelectronics
- Category:
- Display Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M74HC4543RM13TR.pdf
- Description:
- IC LATCH/DECOD/LCD DRIVER 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
M74HC4543RM13TR from STMicroelectronics is a high-speed CMOS BCD-to-7-segment latch/decoder with integrated LCD driver in TSSOP-16 package. It decodes 4-bit BCD inputs into seven-segment outputs, supports blanking via BI input, requires external square-wave PH signal for LCD bias, and operates from 2V to 6V with 14ns typical propagation delay at 6V.
For engineers reviewing the M74HC4543RM13TR datasheet, M74HC4543RM13TR pinout, M74HC4543RM13TR application, or M74HC4543RM13TR equivalent, key selection criteria include LCD-compatible segment drive capability, latch-enabled BCD input retention, active-HIGH blanking and phase control, and operation across industrial temperature range (−55°C to +125°C).
Technical Context
The M74HC4543RM13TR integrates a BCD input latch, decoder logic, and seven-segment output drivers optimized for low-voltage LCD biasing. Its PH input synchronizes segment outputs to an externally supplied common-backplane AC waveform, while BI enables full display blanking independent of BCD state.
It features symmetrical output impedance (|IOH| = IOL ≥ 4 mA), balanced tPLH/tPHL propagation delays, and high noise immunity (VNIH/VNIL ≥ 28% VCC). All inputs include ESD protection diodes, and the device is fully compatible with standard 74-series 4543 logic function and pinout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2 V to 6 V - supports battery-powered and mixed-voltage systems without level shifting |
| tPD (Typ.) | 14 ns at VCC = 6 V - enables fast digit updates in multiplexed LCD displays |
| IOL / IOH (Min.) | 4 mA - sufficient to directly drive LCD segments with typical 1/2 or 1/3 bias ratios |
| ICC (Max.) | 4 µA at TA = 25°C - ultra-low quiescent current for always-on portable instrumentation |
| Operating Temp | −55°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Input Noise Immunity | VNIH/VNIL ≥ 28% VCC - robust against supply ripple and crosstalk in noisy PCB layouts |
| Logic Compatibility | Pin- and function-compatible with 74LS4543 and 74HC4543 - enables drop-in replacement in legacy designs |
Pinout & Package
Package: TSSOP-16 (4.9 × 6.4 mm, 0.65 mm pitch), lead-free and RoHS-compliant per STMicroelectronics specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LD) | Latch Disable Input | Active-HIGH control: latches BCD input when LD = H; transparent when LD = L |
| 2–5 (A–D) | BCD Data Inputs | 4-bit binary-coded decimal address inputs; internally latched on LD edge |
| 6 (PH) | Phase Input | AC square-wave synchronization signal applied to LCD backplane and internal driver timing |
| 7 (BI) | Blanking Input | Active-HIGH: forces all segment outputs LOW regardless of BCD or latch state |
| 8 (GND) | Ground Reference | 0 V return path for logic and segment drive circuits |
| 9–14,15 (a–g) | Segment Outputs | Seven open-drain compatible outputs driving LCD segments a through g; polarity matches PH |
| 16 (VCC) | Positive Supply | Primary power rail (2–6 V); powers logic core and segment drivers |
Key Features
| Feature | Design Value |
|---|---|
| Integrated BCD latch | Enables stable segment output during BCD bus transitions; eliminates flicker in shared-data-bus systems |
| LCD-optimized drive | Outputs swing rail-to-rail with matched rise/fall times and symmetrical impedance for uniform segment contrast |
| BI-controlled blanking | Hardware-level display disable without CPU intervention-critical for power-down or error states |
| Wide VCC range | Operates from single 3.3 V or dual 5 V supplies; eliminates need for dedicated LCD voltage regulators |
| High ESD tolerance | All inputs protected to ±20 mA DC diode current-reduces need for external TVS in handheld interfaces |
Applications
| Industrial Panel Meter Display | Automotive Instrument Cluster |
|---|---|
Use Scenario: 4-digit numeric readout on analog-style dashboard with backlight-independent LCD. IC Role / Device Role / Timing Role: BCD latch/decoder generating synchronized segment waveforms driven by microcontroller's BCD output and shared PH clock. Use Value: Eliminates external transistor arrays and timing logic; reduces BOM count by 7 discrete drivers and associated passives. | Use Scenario: Multi-function warning display showing speed, fuel, and fault codes in passenger vehicle dash. IC Role / Device Role / Timing Role: Segment driver receiving BCD from CAN-connected MCU; BI tied to system error flag for immediate blanking on fault. Use Value: Enables fail-safe visual shutdown without firmware delay; meets ASIL-B functional safety requirements for display integrity. |
| Portable Medical Device UI | Smart Energy Meter Display |
Use Scenario: Battery-powered glucose monitor with 3-digit LCD showing measurement results and units. IC Role / Device Role / Timing Role: Low-power segment driver operating from 3.3 V supply; PH sourced from MCU timer PWM channel. Use Value: Achieves 4 µA quiescent current in standby-extends battery life beyond 2 years in intermittent-use devices. | Use Scenario: DIN-rail mounted kWh meter with 6-digit LCD showing consumption, tariff, and time-of-use data. IC Role / Device Role / Timing Role: Dual-M74HC4543RM13TR configuration driving upper/lower 3-digit groups; BI controlled by tamper-detection circuit. Use Value: Provides hardware-level display disable on enclosure breach-supports IEC 62052-11 tamper evidence requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD-to-LCD decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4543BE | CMOS (not HC), slower tPD (100+ ns @ 5 V), no latch disable (LD), higher ICC (100 µA) | Requires external latch; unsuitable for high-update-rate or ultra-low-power designs | Select only for legacy 4000-series compatibility where speed and power are secondary |
| 74LV4543PW | Lower VCC range (1.0–5.5 V), smaller TSSOP-16 footprint, no PH input - designed for LED, not LCD | Lacks PH synchronization and LCD-specific drive; requires external AC generator and level-shifting for LCD use | Choose only if migrating to LED display or integrating into LV logic families with strict voltage constraints |
Compared with CD4543BE and 74LV4543PW, the M74HC4543RM13TR uniquely combines latch control, PH-synchronized LCD drive, sub-µA standby current, and −55°C to +125°C operation-making it the sole option for robust, low-power, industrial-grade LCD digit drivers.
Availability
M74HC4543RM13TR is available at Aetrix Electronics and suitable for industrial panel meters, automotive instrument clusters, portable medical devices, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for M74HC4543RM13TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal products for industrial, automotive, and consumer markets.
The M74HC4543RM13TR belongs to ST's high-reliability HC logic family, engineered specifically for direct-drive LCD applications in harsh environments where latch stability, low power, and wide temperature operation are critical.
FAQ
Can M74HC4543RM13TR drive LED displays directly?
No. The M74HC4543RM13TR is optimized for LCD segment drive with AC-coupled outputs synchronized to the PH input. Driving LEDs requires DC-compatible outputs and higher current capability; external transistor arrays or dedicated LED drivers like TLC5928 are required for LED use.
What is the required frequency and duty cycle for the PH input signal?
The PH input must be a clean square wave with 50% duty cycle and frequency matching the LCD's recommended bias frequency-typically 30 Hz to 200 Hz. ST recommends using a microcontroller timer or dedicated oscillator to ensure precise phase alignment with the display's backplane signal.
How does the LD (Latch Disable) pin affect real-time display updates?
When LD = HIGH, the internal latch captures and holds the current BCD input, allowing segment outputs to remain stable during bus contention or slow microcontroller updates. When LD = LOW, outputs follow BCD inputs transparently-enabling dynamic digit scanning but risking transient glitches during data changes.
Is the M74HC4543RM13TR compatible with 3.3 V-only systems?
Yes. It operates down to 2 V and is fully specified at 3.3 V, with VIH = 2.31 V (min) and VIL = 1.09 V (max) at that supply. Input thresholds scale with VCC, ensuring reliable interfacing with 3.3 V microcontrollers without level shifters.
M74HC4543RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Display Type:
- LCD
- Configuration:
- 7 Segment
- Interface:
- BCD
- Digits or Characters:
- -
- Current - Supply:
- 40 µA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
M74HC4543RM13TR FAQ
1.How can I place an order for M74HC4543RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC4543RM13TR 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 M74HC4543RM13TR reliable?
The price and inventory of M74HC4543RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC4543RM13TR is usually 5 days.
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M74HC4543RM13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC4543RM13TR 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 M74HC4543RM13TR?
For technical support, including M74HC4543RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC4543RM13TR requirements.
6.How does Aetrix verify that M74HC4543RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HC4543RM13TR 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 M74HC4543RM13TR meets industry standards.
7.What is the process for return or replacement of M74HC4543RM13TR?
All M74HC4543RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC4543RM13TR, 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 M74HC4543RM13TR part is unused and in its original packaging.
Return procedure for M74HC4543RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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