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Diodes Incorporated PT8A977BWEX
- Part No.:
- PT8A977BWEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PT8A977BWEX.pdf
- Description:
- IC CTLR HOME APPLIANCE SOIC-14
- Quantity:
- Payment:
- Shipping:
Inventory:2,261
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Product details
Overview
PT8A977BWEX 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 102–154 kHz oscillator frequency (adjustable via external resistor), and outputs encoded function codes on SO (carrierless) and SC (carrier-modulated) pins for toy-grade wireless control systems.
For engineers reviewing the PT8A977BWEX datasheet, PT8A977BWEX pinout, PT8A977BWEX application, or PT8A977BWEX equivalent, this device is selected for low-cost, battery-sensitive remote transmitters requiring deterministic encoding of forward/backward/left/right/turbo commands with integrated power gating and minimal external components.
Technical Context
The PT8A977BWEX implements a fixed-function digital encoder with five dedicated input pins mapped to directional/turbo functions and a synchronous timing generator driven by an on-chip RC oscillator. Its encoding logic produces time-division multiplexed start and function codes with defined cycle times (tSTA = 1.6–2.4 ms, tFUN = 0.8–1.2 ms) compliant with proprietary remote protocols used in consumer RC toys.
It integrates auto-power-off via internal counter and wake-on-button functionality, with PC pin asserting high to enable external power rails upon keypress. Oscillator frequency matching tolerance (±25% relative error vs. companion decoder) ensures reliable decode synchronization in paired transmitter-receiver systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.8 V to 5.0 V - Enables direct operation from single-cell Li-ion (3.0 V nominal) or dual-AA (3.0 V) batteries without LDO. |
| Oscillator Frequency | 102–154 kHz - Adjustable via external resistor; sets timing resolution for start/function code cycles. |
| Standby Current | 5 µA - Supports multi-month battery life in idle state for handheld remotes. |
| SO/SC Output Drive | CMOS-compatible push-pull - Directly interfaces with IR LED drivers or RF ASK modulators without level-shifting. |
| Encoding Functions | Forward, Backward, Left, Right, Turbo - Dedicated input pins with pull-up logic; no firmware or configuration required. |
| Power Control Pin | PC output active-high - Switches external regulator or battery path on button press, eliminating always-on supply leakage. |
| Operating Temperature | −10 °C to +40 °C - Rated for indoor consumer toy environments, not industrial or automotive. |
Pinout & Package
PT8A977BWEX is supplied in 14-pin SOIC (Small Outline Integrated Circuit) package, RoHS-compliant and tape-and-reel packaged (X suffix). Dimensions: 8.65 mm × 3.90 mm × 1.75 mm, pitch 1.27 mm.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OFF) | Power-down control input | Pull-up enabled; connects to GND to force full shutdown of internal circuitry and PC output. |
| 2 (Backward) | Function input | Active-low input; GND assertion encodes backward command in transmitted frame. |
| 3 (GND) | Ground reference | Primary return path for all internal circuits and I/O; must be low-impedance connection. |
| 4 (Forward) | Function input | Active-low input; GND assertion encodes forward command in transmitted frame. |
| 5 (Turbo) | Function input | Active-low input; GND assertion enables turbo mode, modifying speed or intensity in receiver action. |
| 6 (SC) | Carrier-modulated output | Drives IR LEDs directly at ~51–77 kHz carrier (½ oscillator freq); compatible with standard IR receivers. |
| 7 (SO) | Carrier-free output | Delivers raw encoded logic waveform; used for RF ASK modulation or custom baseband receivers. |
| 8 (VCC) | Positive supply | Accepts 1.8–5.0 V; bypass capacitor (0.1 µF) required adjacent to pin for oscillator stability. |
| 9 (PC) | External power control | Open-drain or push-pull (per variant); asserts high to enable external 3.3 V/5 V rail only during active transmission. |
| 10 (OSCO) | Oscillator output | Provides buffered oscillator signal; may feed external circuitry or verify frequency calibration. |
| 11 (OSCI) | Oscillator input | Connects to external resistor (e.g., 200 kΩ) to set oscillator frequency; internal capacitor completes RC network. |
| 12 (Left) | Function input | Active-low input; GND assertion encodes leftward command in transmitted frame. |
| 13 (Right) | Function input | Active-low input; GND assertion encodes rightward command in transmitted frame. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-power-off with wake-on-button | Reduces average current to ≤5 µA in standby; resumes full operation within <100 µs of any button press. |
| Dual-output encoding (SO + SC) | Enables coexistence of IR and RF remote variants using same encoder IC and PCB layout. |
| On-chip RC oscillator with external resistor tuning | Eliminates need for crystal or ceramic resonator; supports frequency adjustment across 102–154 kHz range. |
| Integrated power control (PC) pin | Directly gates external LDO or DC-DC converter, removing quiescent load from unused subsystems. |
| Five dedicated function inputs with pull-up logic | Simplifies mechanical switch interface-no external resistors or debouncing circuitry required. |
Applications
| RC Toy Transmitter | Low-Cost IR Remote |
|---|---|
|
Use Scenario: Handheld controller for battery-powered RC cars with forward/backward/left/right/turbo motion control. IC Role / Device Role / Timing Role: Encoder generating time-synchronized digital command frames on SO/SC outputs synchronized to internal 128 kHz oscillator. Use Value: Enables sub-10 µA standby current and instant wake-up, extending alkaline battery life to >6 months in intermittent-use toys. |
Use Scenario: Consumer-grade infrared remote for educational robotics kits requiring simple directional control. IC Role / Device Role / Timing Role: Fixed-function encoder mapping mechanical button presses to standardized IR carrier bursts (51–77 kHz) on SC pin. Use Value: Eliminates microcontroller firmware development and reduces BOM count by 4+ components versus MCU-based solutions. |
| RF Remote Transmitter | Power-Gated Wireless Controller |
|
Use Scenario: 27 MHz or 49 MHz ASK-based remote for hobbyist drones or robotic arms. IC Role / Device Role / Timing Role: Provides clean, jitter-free baseband encoding on SO pin for direct modulation of RF transmitter ICs. Use Value: Delivers deterministic timing (tFUN = 1.0 ms ±20%) critical for reliable ASK demodulation in low-SNR environments. |
Use Scenario: Battery-powered handheld controller where external motor driver or sensor subsystem draws >100 mA. IC Role / Device Role / Timing Role: PC pin asserts high only during button press, enabling/disabling entire subsystem power rail synchronously with command transmission. Use Value: Prevents 20–100 µA leakage per disabled subsystem, improving total system standby efficiency by >3×. |
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; no tape/reel; leaded (non-RoHS) option. | Used in through-hole prototyping or legacy production; lacks Pb-free compliance and automated assembly support. | Select PT8A977BP only for hand-soldered evaluation or non-RoHS-compliant legacy builds. |
| PT2262 | 12-bit addressable encoder; requires external oscillator (crystal/resonator); no auto-power-off or PC pin. | Supports multiple devices on same RF channel via address coding; higher component count and static power draw. | Choose PT2262 when multi-device addressing or crystal-based timing stability is mandatory; avoid if ultra-low standby current is required. |
Compared with PT8A977BP and PT2262, PT8A977BWEX uniquely combines tape-and-reel packaging, Pb-free compliance, integrated oscillator tuning, and active power gating-making it optimal for high-volume, battery-constrained, RoHS-mandated RC toy production.
Availability
PT8A977BWEX is available at Aetrix Electronics and suitable for RC toy transmitters, low-cost IR remotes, RF remote transmitters, and power-gated wireless controllers requiring stable component supply, RoHS compliance, and tape-and-reel delivery for SMT lines.
Supply support for PT8A977BWEX 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 communications markets before its 2016 acquisition.
The PT8A977B series belongs to Pericom's legacy remote control ASIC product line, designed specifically for cost-sensitive, low-power, fixed-function infrared and RF toy remote transmitters with minimal external components.
FAQ
What is the function of the PC pin on PT8A977BWEX?
The PC (Power Control) pin is an active-high output that enables external power rails only during button press events. It remains low in standby, cutting off supply to downstream circuitry such as motor drivers or RF transmitters. This reduces system-level quiescent current to microamp levels, directly extending battery life in handheld remotes.
Can PT8A977BWEX operate from a single 1.5 V alkaline cell?
No. The absolute minimum operating voltage is 1.8 V per datasheet specifications. A single 1.5 V alkaline cell falls below this threshold, even at fresh voltage (1.6 V typical). Operation requires ≥2 alkaline cells (3.0 V), a single Li-ion cell (3.0–4.2 V), or regulated 3.3 V supply.
How is oscillator frequency adjusted, and what tolerance must be maintained with the decoder?
Oscillator frequency is set by connecting an external resistor between OSCI and GND; typical value is 200 kΩ for ~128 kHz. The relative error between PT8A977BWEX and its companion decoder (e.g., PT8A978BL) must stay within ±25% to ensure reliable frame synchronization and decoding-verified during paired system validation.
Is PT8A977BWEX pin-compatible with PT8A977BP?
Yes-both share identical 14-pin SOIC/DIP footprints and pin functions. However, PT8A977BWEX uses Pb-free terminations and tape-and-reel packaging, while PT8A977BP is leaded and supplied in tubes. Electrical behavior and timing specs are identical; only packaging and compliance differ.
PT8A977BWEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
PT8A977BWEX FAQ
1.How can I place an order for PT8A977BWEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT8A977BWEX 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 PT8A977BWEX reliable?
The price and inventory of PT8A977BWEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT8A977BWEX is usually 5 days.
3.What payment methods are accepted for PT8A977BWEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT8A977BWEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT8A977BWEX?
PT8A977BWEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT8A977BWEX 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 PT8A977BWEX?
For technical support, including PT8A977BWEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT8A977BWEX requirements.
6.How does Aetrix verify that PT8A977BWEX is sourced from the original manufacturer or authorized distributors?
All PT8A977BWEX 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 PT8A977BWEX meets industry standards.
7.What is the process for return or replacement of PT8A977BWEX?
All PT8A977BWEX units undergo pre-shipment inspection (PSI). If there is an issue with PT8A977BWEX, 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 PT8A977BWEX part is unused and in its original packaging.
Return procedure for PT8A977BWEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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