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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Diodes Incorporated PT8A977BWE

Name: PT8A977BWE
Brand: Diodes Incorporated
SKU: PT8A977BWE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT8A977BWE

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: PT8A977BWE.pdf

Description:: IC MOTOR DRIVER 1.8V-5V 14SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PT8A977BWE from Pericom Semiconductor is a 5-function infrared/RF remote control encoder IC with on-chip oscillator, auto-power-off, wake-on-button, and external power control (PC) output. It operates from 1.8V to 5.0V, delivers SO (carrier-less) and SC (carrier-modulated) encoded outputs, and supports forward/backward/left/right/turbo functions for RC toys. Its 14-pin SOIC package integrates timing, encoding, and low-power management in a single chip.

For engineers reviewing the PT8A977BWE datasheet, PT8A977BWE pinout, PT8A977BWE application, or PT8A977BWE equivalent, key selection criteria include oscillator frequency tolerance (±25% relative match with decoder), PC output drive capability, SO/SC signal format compatibility, and 1.8V minimum supply operation for battery-powered designs.

Technical Context

The PT8A977BWE implements a fixed-function digital encoder with five dedicated input pins mapped to directional/turbo actions and two synchronized output channels: SO (unmodulated logic-level code) and SC (carrier-frequency modulated code). Encoding uses a start-code + function-code protocol with cycle times of 1.6–2.4 ms (start) and 0.8–1.2 ms (function), derived from an external-resistor-tuned on-chip oscillator (102–154 kHz).

Power management includes an internal counter-driven auto-power-off mode that disables oscillator and outputs after button inactivity, and a wake-on-any-button feature that restores full operation within microseconds. The PC pin provides active-low open-drain output capable of controlling external LDOs or load switches, enabling system-level power gating.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	1.8 V to 5.0 V - Enables direct use with single-cell Li-ion (3.0–3.7 V), alkaline (2×AA = 3.0 V), or USB-powered systems.
Oscillator Frequency	102–154 kHz - Set by external resistor; must match PT8A978B/978BL decoder within ±25% for reliable link budget.
Standby Current	5 µA - Achieved via auto-power-off; extends shelf life and runtime in battery-operated remote controls.
SO/SC Output Format	Digital pulse train with start code (1.6–2.4 ms) and function code (0.8–1.2 ms) - Directly interfaces with IR LED drivers or RF ASK modulators.
PC Output Type	Open-drain, active-low - Sinks up to 20 mA; used to enable/disable external 3.3 V or 5 V rails for MCU, radio, or motor driver sections.
Input Logic Threshold	V_IL ≤ 0.8 V, V_IH ≥ 3.0 V - Compatible with standard CMOS and switch-to-ground button interfaces without pull-up resistors.

Pinout & Package

PT8A977BWE is supplied in a 14-pin SOIC package (body width 3.9 mm, lead pitch 1.27 mm), RoHS-compliant and Pb-free per ordering suffix "E".

Pin	Circuit Role	Design Meaning
1 (OFF)	Power-down control input	Pull-up enables automatic shutdown when no button pressed; tied high to activate auto-power-off.
2 (Backward)	Function input	Active-low input; grounded to select backward action - directly wired to momentary switch.
3 (GND)	Ground reference	Primary return path for all internal circuits and output drivers; requires low-impedance PCB connection.
4 (Forward)	Function input	Active-low input; grounded to select forward action - shares same debounce and encoding logic as other inputs.
5 (Turbo)	Function input	Active-low input; enables high-speed mode when asserted with Forward or Backward - no external timing components needed.
6 (SC)	Modulated output	Carrier-frequency-encoded signal (51–77 kHz) for IR transmission; drives transistor-based LED driver stages directly.
7 (SO)	Unmodulated output	Logic-level encoded signal (no carrier); used for RF ASK transmitters or wired control links requiring clean digital edges.
8 (VCC)	Positive supply	Accepts 1.8–5.0 V; internal regulator stabilizes core logic; bypass capacitor (0.1 µF) required at pin.
9 (PC)	Power control output	Open-drain, active-low output; sinks up to 20 mA to turn on external P-MOSFET or enable pin of DC/DC converter.
10 (OSCO)	Oscillator output	Drives external crystal or ceramic resonator; connects to one terminal of timing resistor (200 kΩ typical).
11 (OSCI)	Oscillator input	Connects to other terminal of timing resistor; forms RC network defining oscillator frequency with OSCO.
12 (Left)	Function input	Active-low input; grounded to select leftward motion - electrically identical to Right, Forward, Backward, Turbo.
13 (Right)	Function input	Active-low input; grounded to select rightward motion - debounced and encoded with identical latency.
14 (NC)	No connect	Not bonded internally; must be left floating or tied to GND per layout guidelines - no electrical function.

Key Features

Feature	Design Value
Auto-power-off with wake-on-button	Reduces average current to 5 µA during idle; resumes full operation <100 µs after any button press - eliminates manual power switch.
Dual-output encoding (SO + SC)	SO provides baseband logic for RF modules; SC provides carrier-modulated output for IR LEDs - single IC supports both physical layers.
External resistor-tuned oscillator	Frequency set by single 200 kΩ resistor (typical); eliminates crystal cost and board space while maintaining ±25% match requirement with decoder.
Integrated power control (PC) pin	Directly gates external 3.3 V/5 V supplies - enables zero-quiescent-current sleep for entire remote subsystem (MCU, radio, sensors).
Five dedicated function inputs	Hardwired mapping for forward/backward/left/right/turbo - no firmware or configuration required; reduces BOM and qualification effort.

Applications

RC Toy Control

IR Remote Transmitter

Use Scenario: Handheld controller for 2.4 GHz or 27 MHz RC cars with directional movement and turbo boost.

IC Role / Device Role / Timing Role: Encoder generating time-synchronized SO/SC command frames aligned to 102–154 kHz oscillator base.

Use Value: Eliminates need for microcontroller and custom firmware; reduces bill-of-materials and time-to-market for toy OEMs.

Use Scenario: Compact infrared remote for consumer electronics with discrete function buttons and low standby power.

IC Role / Device Role / Timing Role: IR signal generator producing 38 kHz carrier-modulated (SC) output compatible with standard IR receivers.

Use Value: SC output meets common IR receiver center-frequency requirements without external carrier generator circuitry.

Low-Power Wireless Remote

Industrial Remote Switching

Use Scenario: Battery-powered wireless transmitter for industrial actuators using ASK/OOK modulation.

IC Role / Device Role / Timing Role: Baseband encoder (SO output) driving RF transmitter IC's data input with precise start/function timing.

Use Value: SO output provides clean, jitter-free digital waveform for reliable OOK demodulation at distances >50 m.

Use Scenario: Maintenance-free remote control for warehouse lighting or HVAC zone switching with multi-year battery life.

IC Role / Device Role / Timing Role: System power manager using PC pin to cut power to RF module and MCU between commands.

Use Value: PC output reduces system quiescent current from mA-range to µA-range, extending CR2032 battery life to >2 years.

Equivalent & Alternatives

The following parts are listed as comparable options for similar remote control encoder applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PT8A977BP	Same die, 14-pin DIP package - wider pitch (2.54 mm), through-hole mounting, higher thermal resistance.	Suitable for prototyping or legacy through-hole assembly; not recommended for high-density or automated SMT lines.	Select PT8A977BP only if DIP footprint and hand-soldering are required; PT8A977BWE offers better manufacturability and thermal performance.
PT8A977BW	Same die, 14-pin SOIC package but non-Pb-free - contains lead per JEDEC J-STD-609 Class 1.	Restricted to non-RoHS markets or legacy compliance programs where Pb-free is not mandated.	Choose PT8A977BW only if RoHS exemption applies; PT8A977BWE satisfies global environmental regulations including EU RoHS and China RoHS.

Compared with PT8A977BP (DIP) and PT8A977BW (non-Pb-free SOIC), PT8A977BWE provides optimal balance of SMT compatibility, RoHS compliance, and thermal performance for volume production of battery-powered remotes.

Availability

PT8A977BWE is available at Aetrix Electronics and suitable for RC toy controllers, infrared remote transmitters, low-power wireless remotes, and industrial remote switching applications requiring stable component supply across product lifecycles.

Supply support for PT8A977BWE 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

Pericom Semiconductor (now part of Diodes Incorporated) specialized in high-performance interface, timing, and connectivity ICs for consumer, computing, and industrial markets before its 2016 acquisition.

The PT8A977B series belongs to Pericom's remote control encoder product line, designed specifically for cost-sensitive, battery-powered RC toys and simple IR/RF remotes requiring minimal external components and ultra-low standby current.

FAQ

What is the maximum allowable oscillator frequency mismatch between PT8A977BWE and its paired decoder?

The relative error between the on-chip oscillator frequencies of PT8A977BWE and PT8A978B/978BL must be less than ±25% to ensure reliable decoding. This is verified by selecting the same external timing resistor value and operating voltage range for both encoder and decoder in the same design.

Can the PC pin drive a P-channel MOSFET directly for external power control?

Yes - the PC pin is an open-drain output rated for 20 mA sink current and 6 V max voltage. It can directly drive the gate of a logic-level P-MOSFET (e.g., Si2301) with appropriate pull-up to VCC, enabling complete power gating of downstream circuitry without additional driver stages.

Does PT8A977BWE require external pull-up resistors on its function input pins?

No - all five function input pins (Forward, Backward, Left, Right, Turbo) have internal pull-up circuitry. They are active-low and should be connected directly to GND via momentary switches; no external resistors are needed for basic operation.

Is the SC output compatible with standard 38 kHz IR receivers such as TSOP38238?

Yes - the SC output generates a carrier-modulated signal with center frequency of 51–77 kHz depending on oscillator setting. While 38 kHz is most common, many modern IR receivers (e.g., VS1838B) support 36–56 kHz bands; verify receiver datasheet bandwidth before final selection.

PT8A977BWE Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Motor Type - Stepper:: -

Motor Type - AC, DC:: -

Function:: Controller - Commutation, Direction Management

Output Configuration:: -

Interface:: -

Technology:: -

Step Resolution:: -

Applications:: -

Current - Output:: -

Voltage - Supply:: 1.8V ~ 5V

Voltage - Load:: -

Operating Temperature:: -10°C ~ 40°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

PT8A977BWE FAQ

1.How can I place an order for PT8A977BWE through Aetrix?

Please submit a Request for Quotation (RFQ) for PT8A977BWE 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 PT8A977BWE reliable?

The price and inventory of PT8A977BWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT8A977BWE is usually 5 days.

3.What payment methods are accepted for PT8A977BWE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT8A977BWE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT8A977BWE?

PT8A977BWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT8A977BWE 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 PT8A977BWE?

For technical support, including PT8A977BWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT8A977BWE requirements.

6.How does Aetrix verify that PT8A977BWE is sourced from the original manufacturer or authorized distributors?

All PT8A977BWE 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 PT8A977BWE meets industry standards.

7.What is the process for return or replacement of PT8A977BWE?

All PT8A977BWE units undergo pre-shipment inspection (PSI). If there is an issue with PT8A977BWE, 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 PT8A977BWE part is unused and in its original packaging.

Return procedure for PT8A977BWE:

1.Submit a request within 90 days.

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

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