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Diodes Incorporated AP43781DKZ-13
- Part No.:
- AP43781DKZ-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Power Management - Specialized
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
AP43781DKZ-13.pdf
- Description:
- ACDC DECODER W-QFN4040-24 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,865
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Product details
Overview
AP43781DKZ-13 from Diodes Incorporated is a USB Type-C® Power Delivery (PD) 3.1 SPR controller with integrated DisplayPort™ Alternate Mode support, designed for monitor and TV power boards. It delivers programmable PPS (3.3–21 V / 0–5 A) with 20 mV/step voltage and 50 mA/step current resolution, supports e-Marker cable detection, and provides I²C-controlled routing to high-speed switches and retimers for DP data path management.
For engineers reviewing the AP43781DKZ-13 datasheet, AP43781DKZ-13 pinout, AP43781DKZ-13 application, or AP43781DKZ-13 equivalent, key selection considerations include its dual-role I²C master/slave interface, CC/CV feedback via optocoupler, OTP/MTP firmware architecture, and integrated safety protections (OVP/UVP/OCP/SCP/OTP) for robust USB PD sourcing in display-class power systems.
Technical Context
The AP43781DKZ-13 implements a full USB PD 3.1 SPR PHY with BMC encoding/decoding, VDM parsing for DisplayPort Alternate Mode entry (Discover SVIDs, Enter Mode, DP Configure), and real-time I²C coordination with external re-timers (e.g., PI3DPX1207C) and multiplexers (e.g., PI3USB31531). Its MCU subsystem uses an 8-bit 8051 core with dedicated hardware offload for PD handshaking.
It executes CV/CC regulation via dual op-amp loops referenced to VFB (CV) and IFB (CC), driving the OCDRV open-drain output to control optocoupled primary-side DC/DC stages. Cable-loss compensation (22–42 mV/A) and programmable OTP-based temperature sensing (100 µA source, 90–110 µA) are implemented in analog front-end blocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB PD Compliance | Full USB PD Rev 3.1 Standard Power Range (SPR) with PPS support up to 21 V / 5 A |
| PPS Resolution | 20 mV/step voltage, 50 mA/step current - enables fine-grained battery charging and adaptive display power delivery |
| DisplayPort Support | Full Alt Mode protocol stack: Discover Identify, SVIDs, Modes, Enter/Exit Mode, DP Status & Configure - enables native DP video tunneling over Type-C |
| Protection Functions | OVP (5.6–16.2 V thresholds), UVP (3.3–10 V), OCP, SCP, OTP (140°C trip, 25°C hysteresis) with auto-restart - ensures fail-safe operation during transient faults |
| I²C Interface | Configurable master/slave mode with START/STOP protocol compliance - allows bidirectional control of re-timers, switches, and system status registers |
| Operating Voltage | 3.3 V to 24 V on VCC - supports wide-input auxiliary supplies common in monitor/TV power boards |
| Package | W-QFN4040-24 (Type A1), 4.0 mm × 4.0 mm, 0.5 mm pitch - compact footprint for space-constrained display power modules |
Pinout & Package
AP43781DKZ-13 is housed in a thermally enhanced W-QFN4040-24 (Type A1) package with exposed thermal pad. Pin 1 (ISENP) is top-left when marking dot is oriented top-left; pin count is 24, arranged in 6×4 grid.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ISENP | Current sense positive input | Connects to high-side Rsense for CC loop - enables accurate output current monitoring and limiting |
| 2 OCDRV | Open-drain CV/CC control output | Drives optocoupler LED to regulate primary-side DC/DC - supports isolated feedback without secondary-side controllers |
| 4 SDA / 5 SCL | I²C bidirectional data/clock | Configurable as master or slave - routes DP configuration commands to switches/re-timers and reads back link status |
| 13 OTP | External NTC bias current source | 100 µA programmable current - powers external thermistor for precise junction temperature monitoring and thermal foldback |
| 16 CC1 / 17 CC2 | Type-C configuration channel inputs | Detect cable attachment/orientation, Rd/Rp values, and e-Marker presence - initiates PD negotiation and VCONN control |
| 18 DN / 19 DP | Type-C SuperSpeed differential pairs | Direct connection to DP AUX/HPD signals - enables physical-layer handshake and hot-plug detection for Alt Mode activation |
| 23 PWR_EN | nMOS gate driver output | Active-high control for external VBUS switch - enables/disables 5–21 V power delivery with <50 µs OVP shutdown latency |
Key Features
| Feature | Design Value |
|---|---|
| Integrated USB PD 3.1 PHY + MCU | 8051 core with hardware BMC encoder/decoder - reduces host MCU overhead and guarantees timing-critical PD handshake compliance |
| Programmable Cable Loss Compensation | Adjustable 0–7×VCABLE (22–42 mV/A) - maintains target VBUS at sink under varying cable resistance without external compensation circuitry |
| Dual ROM Architecture | OTP for immutable PD/QC/FCP firmware + MTP for field-updatable system configuration - enables secure boot and flexible topology adaptation |
| GPIO Flexibility | 5 configurable GPIOs with internal pull options and 100 µA OTP current source - supports LED indicators, fault signaling, UART debug, and NTC-based thermal management |
| LDO Outputs | V3VD (3.3 V) and V5V (5 V) regulated outputs - powers local logic, level shifters, and I²C peripherals without external regulators |
Applications
| Monitor Power Board | Smart TV USB-C Hub |
|---|---|
|
Use Scenario: 27-inch 4K monitor with single USB-C port delivering power, video, and data to laptops. IC Role / Device Role / Timing Role: USB-C PD source controller and DP Alt Mode coordinator - negotiates PPS profiles, decodes VDMs, and configures PI3USB31531 switches via I²C. Use Value: Eliminates need for separate PD controller and DP manager ICs; reduces BOM count by integrating protocol stack, CV/CC control, and protection in one QFN24 device. |
Use Scenario: 55-inch Android TV with USB-C input supporting laptop docking for screen mirroring and charging. IC Role / Device Role / Timing Role: Upstream Facing Port (UFP) for DP tunneling - handles Discover SVIDs, Enter Mode, and DP Configure sequences while managing VBUS discharge during hot-unplug. Use Value: Enables seamless DP video handoff within <100 ms of cable insertion; supports dynamic resolution switching (e.g., 1080p ↔ 4K) via I²C-triggered re-timer reconfiguration. |
| USB-C Docking Station | Commercial Digital Signage |
|
Use Scenario: Multi-port desktop dock providing 60 W PPS power, DP 1.4 video, and USB 3.2 data to notebooks. IC Role / Device Role / Timing Role: PD source + DP Alt Mode decoder - manages concurrent CC negotiation and DP AUX channel signaling while coordinating PI3DPX1207C re-timers. Use Value: Maintains stable DP link integrity across voltage transitions (e.g., 9 V ↔ 20 V) using synchronized I²C updates and cable-loss compensation - prevents video flicker or dropouts. |
Use Scenario: 43-inch retail kiosk with USB-C service port for firmware updates and remote diagnostics. IC Role / Device Role / Timing Role: Secure PD controller with MTP-configurable profiles - enforces OEM-defined power limits (e.g., max 15 W) and logs fault events to internal registers. Use Value: Supports field firmware updates via I²C and provides traceable thermal history (OTP/NCT readings) for predictive maintenance in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB PD 3.1 + DisplayPort Alt Mode controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STUSB4500QTR | Single-role PD controller (no native DP Alt Mode decode); requires external MCU for VDM parsing and I²C coordination | Suitable for basic PD sourcing only - cannot autonomously manage DP routing or re-timer configuration | Select when DP functionality is handled by host processor and cost sensitivity outweighs integration benefit |
| TI TPS65988DHAR | Supports PD 3.1 + DP Alt Mode + USB3.2 Gen2; integrates full ARM Cortex-M0+ and embedded flash - higher gate count and BOM cost | Targeted at premium docks with multi-protocol support (USB3, Thunderbolt 3) - over-specified for monitor-only use cases | Select when simultaneous USB3 data tunneling and DP video are required, and board space permits larger QFN56 package |
Compared with STUSB4500QTR and TPS65988DHAR, the AP43781DKZ-13 uniquely balances full DP Alt Mode autonomy, compact QFN24 packaging, and optimized cost for display-class PD sources - delivering verified DP video handoff without external MCU dependency or premium multi-protocol overhead.
Availability
AP43781DKZ-13 is available at Aetrix Electronics and suitable for monitor power boards, smart TV USB-C hubs, and commercial digital signage requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.
Supply support for AP43781DKZ-13 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The AP43781DKZ-13 belongs to Diodes' USB Type-C & Power Delivery product line, engineered specifically for display-oriented power delivery systems requiring integrated PD 3.1 SPR, PPS, and DisplayPort Alternate Mode coordination in minimal footprint.
FAQ
Does AP43781DKZ-13 support USB PD 3.1 Extended Power Range (EPR)?
No. The AP43781DKZ-13 supports only Standard Power Range (SPR) per USB PD Rev 3.1, with maximum 21 V / 5 A output. It does not implement EPR's 28–48 V operation, 5 A current, or new SOP'/SOP" messaging - confirmed by datasheet Section 1 and electrical characteristics tables.
Can AP43781DKZ-13 operate without an external DC/DC controller?
No. It is a PD controller only - it lacks integrated power switches or PWM drivers. It requires external buck-boost or flyback controllers (e.g., AP3306, MPQ4312) for VBUS generation, with CV/CC feedback delivered via OCDRV to optocouplers or error amplifiers.
What is the function of the NC pins (Pin 10 and Pin 21)?
Pins 10 and 21 are designated No Connection in the official pinout table (DS45748 Rev 4-2, p.3). They must remain unconnected - no internal circuitry ties to these pads, and soldering or routing to them may cause functional interference or reliability risk.
How is DisplayPort Alt Mode activated after PD negotiation completes?
After successful PDO exchange, the AP43781DKZ-13 detects VDMs on the CC channel, parses Discover SVIDs → Discover Modes → Enter Mode commands, then asserts I²C writes to configure downstream switches (e.g., PI3USB31531) and re-timers (e.g., PI3DPX1207C) - all autonomously without host MCU intervention.
AP43781DKZ-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- USB Dedicated Charging Port (DCP), Power Switch
- Current - Supply:
- 3.3mA
- Voltage - Supply:
- 3.3V ~ 24V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- W-QFN4040-24 (Type A1)
AP43781DKZ-13 FAQ
1.How can I place an order for AP43781DKZ-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP43781DKZ-13 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 AP43781DKZ-13 reliable?
The price and inventory of AP43781DKZ-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP43781DKZ-13 is usually 5 days.
3.What payment methods are accepted for AP43781DKZ-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP43781DKZ-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP43781DKZ-13?
AP43781DKZ-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP43781DKZ-13 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 AP43781DKZ-13?
For technical support, including AP43781DKZ-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP43781DKZ-13 requirements.
6.How does Aetrix verify that AP43781DKZ-13 is sourced from the original manufacturer or authorized distributors?
All AP43781DKZ-13 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 AP43781DKZ-13 meets industry standards.
7.What is the process for return or replacement of AP43781DKZ-13?
All AP43781DKZ-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP43781DKZ-13, 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 AP43781DKZ-13 part is unused and in its original packaging.
Return procedure for AP43781DKZ-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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