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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

STMicroelectronics STCC05-BD4

Name: STCC05-BD4
Brand: STMicroelectronics
SKU: STCC05-BD4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STCC05-BD4

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: 20-DIP (0.300", 7.62mm)

Datasheet:: STCC05-BD4.pdf

Description:: IC CTRLR AC PWR APPLIANCE 20DIP

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Product details

Overview

STCC05-BD4 from STMicroelectronics is a home appliance control circuit integrating 5V regulator (±5%, 50mA), MCU reset with hysteresis (3.75V/3.4V), 30µs digitally filtered zero-voltage sync (ZVS), four relay drivers (three 50mA + one 150mA), and buzzer driver with soft-turn-off. It serves as the analog/power interface between MCU and AC power sections in air conditioner compressor/fan control modules.

For engineers reviewing the STCC05-BD4 datasheet, STCC05-BD4 pinout, STCC05-BD4 application, or STCC05-BD4 equivalent, this device supports precise timing-critical load switching, functional safety–compliant reset behavior, robust ESD immunity (±2kV HBM), and compact board-level integration for white goods control boards.

Technical Context

The STCC05-BD4 implements a dedicated mixed-signal architecture for HVAC control: its 5V regulator uses internal current limiting and thermal shutdown (170°C trip, 15°C hysteresis); the reset circuit employs external capacitor CUP (100nF) to set 400µs disable delay and 200µs enable delay; ZVS generation includes digital 30µs filtering and ESD-hardened SYN input (±2kV IEC 61000-4-2 contact).

Relay drivers feature grounded-emitter NPN outputs with integrated demagnetizing diodes-RL1–RL3 rated for 50mA DC (V_ON ≤ 1.2V at 50mA), RL4 for 150mA DC (V_ON ≤ 1.2V at 150mA); buzzer driver provides 30mA peak output via BZ1/BZ2 with ENBZ-controlled soft turn-off using external RC network.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	7–18 V - Enables direct connection to unregulated SMPS or transformer-derived rails without external LDO pre-regulation.
5V Regulator Output	4.75–5.25 V @ 5–40 mA - Maintains ±5% accuracy across temperature (−20°C to 85°C) and load, directly supporting MCU ADC reference stability.
Reset Thresholds	3.75 V (disable), 3.4 V (enable) - Provides 0.35 V hysteresis to prevent oscillation during brown-out recovery.
ZVS Filtering Time	10–70 µs (typ. 30 µs) - Digitally filters AC line transients to ensure reliable zero-crossing detection for phase-controlled triac firing.
RL4 Driver Current	150 mA DC - Sufficient to drive 20A relay coils (e.g., G4A-E-DC12) with minimum 130Ω resistance and 1.1W power rating.
Buzzer Peak Current	±50 mA (50 µs pulse) - Supports loud audible alerts with PWM up to 5 kHz while limiting EMI via ROH/RBZ current limiting.
ESD Immunity	±2 kV HBM, ±2 kV IEC 61000-4-2 - Meets industrial appliance immunity requirements without external protection components.

Pinout & Package

DIP-20 package with 2.54 mm pitch; 100% lead-free finish; RoHS compliant; thermal resistance R_th(j-a) = 90°C/W on single-layer PCB (35 µm Cu, 0.5 cm² copper area).

Pin/Terminal	Circuit Role	Design Meaning
VPS	Main power supply input	Accepts 7–18 V unregulated input; powers all internal regulators and drivers; max 500 mA pulsed sourcing capability.
VDD	5 V regulated output	Supplies MCU core logic; requires 100 µF output capacitor for ±5% regulation; includes overcurrent and thermal shutdown.
/RST	Active-low reset output	Drives MCU reset pin low until VDD exceeds 3.75 V; delay set by external CUP (100 nF → 400 µs disable time).
ZVS	Inverted zero-crossing sync output	Provides clean, filtered 50/60 Hz timing reference for MCU-controlled AC load switching; inverted relative to SYN input.
RL1–RL4	Relay driver outputs	Open-collector NPN outputs referenced to COM; RL1–RL3 sink 50 mA, RL4 sinks 150 mA; each includes integrated flyback diode.
BZ1 / BZ2	Buzzer driver terminals	BZ1: low-side switch output; BZ2: high-side supply terminal; enabled via ENBZ; soft turn-off controlled by external RC on BZ2.
IN1–IN4	Relay activation inputs	CMOS-compatible logic inputs (V_IN > 3.1 V activates); each controls one RLx driver; threshold 0.8–3.1 V.
INBZ / ENBZ	Buzzer control inputs	INBZ accepts 50% PWM (0.01–5 kHz); ENBZ enables/disables entire buzzer stage; both have 0.8–3.1 V thresholds.
INS / OUTS	Speed sensor level shifter I/O	INS: non-inverting 7–18 V tolerant input for Hall sensor/door switch; OUTS: 5 V logic-level output to MCU; includes EMI filter.
SYN	ZVS input	Accepts AC-derived signal (via resistor or optocoupler); protected by 30 µs digital filter and ±2 kV ESD clamps.
COM	Power ground reference	Common emitter node for all relay and buzzer drivers; must be separated from signal ground (VDD) per layout guidelines.

Key Features

Feature	Design Value
Integrated 5 V regulator with thermal shutdown	Eliminates need for external LDO; 170°C trip point with 15°C hysteresis prevents latch-up during sustained overload.
Digitally filtered ZVS with 30 µs response	Rejects fast line transients (IEC 61000-4-4 bursts) while preserving accurate zero-crossing timing for triac gate control.
Four independent relay drivers with flyback diodes	Reduces BOM count by 4× discrete transistors + 4× external diodes; RL4's 150 mA rating supports 20A compressor relays directly.
Buzzer driver with soft turn-off via ENBZ	External RC on BZ2 eliminates mechanical "click" noise; RBZ = 1 kΩ ensures full buzzer discharge within 100 µs at 5 kHz max frequency.
Robust level shifter for speed sensor interface	Accepts 7–18 V Hall sensor signals on INS; delivers clean 5 V logic to MCU on OUTS; built-in EMI filter improves fan RPM measurement reliability.

Applications

Air Conditioner Compressor Control

Refrigerator Fan Speed Management

Use Scenario: Controlling 20A compressor relay based on room temperature and evaporator sensor feedback.

IC Role / Device Role / Timing Role: STCC05-BD4 provides ZVS-synchronized timing for triac firing, drives RL4 relay coil, and supplies stable 5V to MCU managing PID loop.

Use Value: Enables precise phase-angle control of compressor power with <50 µs ZVS delay variation, reducing audible noise and improving energy efficiency.

Use Scenario: Monitoring indoor fan RPM via Hall sensor and adjusting speed via PWM-driven relay-based voltage taps.

IC Role / Device Role / Timing Role: STCC05-BD4 converts Hall pulses on INS to clean 5V OUTS signal for MCU counting; drives RL1–RL3 for multi-tap motor control.

Use Value: Eliminates external level-shifting IC and discrete relay drivers, cutting board space by 35% and solder joints by 22.

Oven Heater Power Sequencing

Smart Washing Machine Valve Actuation

Use Scenario: Sequentially energizing multiple heating elements with overtemperature interlock and zero-crossing turn-on.

IC Role / Device Role / Timing Role: STCC05-BD4 uses /RST to hold MCU in reset during brown-out; ZVS ensures heater relays switch only at voltage zero to minimize EMI.

Use Value: Achieves Class B EMC compliance per IEC 61000-4-4 (4 kV burst tested) without added ferrites or shielding.

Use Scenario: Driving solenoid valves (3A/12V) and water pump relays in timed cycles with fault detection.

IC Role / Device Role / Timing Role: STCC05-BD4 drives RL1–RL3 for valve control; monitors door switch via INS/OUTS; triggers buzzer alert on lid-open event via INBZ/ENBZ.

Use Value: Integrates 3× relay drivers + buzzer + reset + ZVS into single DIP-20, reducing assembly time by 18 minutes per unit vs. discrete solution.

Equivalent & Alternatives

The following parts are listed as comparable options for similar home appliance control applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STCC05-BD3	Same die, different marking; identical electrical specs and pinout.	No functional difference; BD3 and BD4 are factory variants with same qualification and reliability data.	Select BD4 when traceability to October 2004 revision (REV. 1) is required per OEM design documentation.
BD9224FV	Single-chip 5V regulator + reset + watchdog; no ZVS, relay drivers, or buzzer support.	Lacks AC synchronization, power switching, and audio functions - requires external drivers for any load control.	Only suitable if system already implements discrete relay/buzzer circuits and needs only enhanced reset + regulator functionality.

Compared with STCC05-BD4, BD9224FV reduces integration but forces external component addition for ZVS, relay driving, and buzzer control; STCC05-BD3 offers identical performance with alternate marking for legacy BOM alignment.

Availability

STCC05-BD4 is available at Aetrix Electronics and suitable for air conditioner compressor control, refrigerator fan management, oven heater sequencing, and washing machine valve actuation requiring stable component supply across extended product lifecycles.

Supply support for STCC05-BD4 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 devices for automotive, industrial, and consumer markets.

The STCC05 product line targets cost-sensitive, high-reliability home appliance control systems, integrating critical analog and power functions to replace discrete solutions in HVAC, refrigeration, and cooking equipment.

FAQ

What is the maximum ambient temperature for continuous operation of STCC05-BD4?

The STCC05-BD4 is rated for continuous operation from −20°C to +85°C ambient temperature. At 85°C, total relay driver current must be limited to 300 mA DC (per Table 4), and regulator output current reduced to maintain junction temperature below 150°C, as thermal resistance is 90°C/W on standard PCB layout.

Can STCC05-BD4 drive a 24 V relay coil?

No - STCC05-BD4 relay drivers are designed for 12 V nominal systems. Its absolute maximum VPS rating is 20 V, and RL4's 150 mA DC rating assumes VPS = 12 V per datasheet test conditions. Driving a 24 V coil would exceed safe operating area and risk thermal shutdown or output transistor failure.

How is the ZVS output synchronized to 60 Hz AC mains?

ZVS synchronizes to 60 Hz mains via the SYN pin, which accepts an AC-derived signal (e.g., from transformer secondary or optocoupler). Internal 30 µs digital filtering removes noise, and the output is inverted - a falling edge on ZVS corresponds to the zero-crossing event, enabling precise triac triggering with <115 µs worst-case delay.

Does STCC05-BD4 require external components for reset functionality?

Yes - a 100 nF capacitor (CUP) must be connected between /RST and COM to set the 400 µs disable delay and 200 µs enable delay. No pull-up resistor is needed as /RST is actively driven; however, a >100 kΩ resistor (RUP) from /RST to VDD may be used to fine-tune delay if required.

STCC05-BD4 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Applications:: Home Appliance

Current - Supply:: 1.3mA

Voltage - Supply:: 7V ~ 18V

Operating Temperature:: -20°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 20-DIP

STCC05-BD4 FAQ

1.How can I place an order for STCC05-BD4 through Aetrix?

Please submit a Request for Quotation (RFQ) for STCC05-BD4 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 STCC05-BD4 reliable?

The price and inventory of STCC05-BD4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STCC05-BD4 is usually 5 days.

3.What payment methods are accepted for STCC05-BD4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STCC05-BD4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STCC05-BD4?

STCC05-BD4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STCC05-BD4 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 STCC05-BD4?

For technical support, including STCC05-BD4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STCC05-BD4 requirements.

6.How does Aetrix verify that STCC05-BD4 is sourced from the original manufacturer or authorized distributors?

All STCC05-BD4 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 STCC05-BD4 meets industry standards.

7.What is the process for return or replacement of STCC05-BD4?

All STCC05-BD4 units undergo pre-shipment inspection (PSI). If there is an issue with STCC05-BD4, 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 STCC05-BD4 part is unused and in its original packaging.

Return procedure for STCC05-BD4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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