NXP Semiconductors PTN3381BBS,518

Overview

PTN3381BBS,518 from NXP Semiconductors is a fully integrated HDMI/DVI level shifter IC that converts four lanes of low-swing AC-coupled differential inputs (DisplayPort/PCIe-compliant) to DVI v1.0/HDMI v1.3a–compliant TMDS outputs at up to 1.65 Gbit/s per lane, includes an on-board 5 V regulator, active DDC buffering with rise-time acceleration, and HDMI dongle detection via I²C-bus slave ROM. It enables DisplayPort-to-HDMI/DVI adapter designs with minimal external components.

For engineers reviewing the PTN3381BBS,518 datasheet, PTN3381BBS,518 pinout, PTN3381BBS,518 application, or PTN3381BBS,518 equivalent, key selection considerations include TMDS lane speed (1.65/2.25 Gbit/s), integrated 5 V regulator (75 mA, ±300 mV), back-current-safe sink-side terminals, programmable pre-emphasis (0/3.5/6 dB), and DDC-level-shifting compliance with HDMI DDC v1.3a distance spec (18 m).

Technical Context

The PTN3381BBS,518 implements transparent, non-retiming level translation across three signal domains: (1) four high-speed TMDS lanes with self-biasing 50 Ω AC-coupled inputs and open-drain current-steering outputs; (2) bidirectional DDC channel using active I²C-bus buffer with 3.3 V ↔ 5 V level shifting, rise-time acceleration, and capacitive isolation up to 1400 pF on sink side; (3) HPD level shifter with 200 kΩ integrated pull-down and back-power-safe design. All sink-side interfaces feature back-drive protection.

Its functional architecture includes independent enable controls: OE_N disables TMDS paths only, DDC_EN isolates DDC I/Os, and DDET activates HDMI dongle detection via I²C read response at address 0x81. The integrated 5 V regulator uses CP/CN pins for external charge-pump capacitors and delivers regulated output whenever VDD (3.3 V ±10 %) is valid.

Key Specifications

Pinout & Package

HVQFN48 package (7 mm × 7 mm × 0.85 mm), thermally enhanced with exposed center pad requiring PCB thermal vias and solder connection to GND. All 8 VDD pins and 9 GND pins (including exposed pad) must be connected for proper operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar HDMI/DVI level shifter applications.

Compared with PTN3361BBS,518, the PTN3381BBS,518 adds self-contained 5 V regulation for dongle autonomy; compared with SN75DP130RGZT, it provides complete DVI/HDMI adapter functionality (DDC, HPD, regulator) at lower bandwidth but broader standard coverage.

Availability

PTN3381BBS,518 is available at Aetrix Electronics and suitable for DisplayPort-to-HDMI adapters, DisplayPort-to-DVI adapters, HDMI dongle detection systems, and multi-standard display source designs requiring stable component supply and long-term production continuity.

Supply support for PTN3381BBS,518 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The PTN3381BBS,518 belongs to NXP's display interface product line, engineered specifically for compact, high-integration video adapter and dongle applications requiring seamless DisplayPort-to-HDMI/DVI translation with minimal external components.

FAQ

What is the maximum supported data rate per TMDS lane for PTN3381BBS,518?

The PTN3381BBS,518 supports up to 1.65 Gbit/s per TMDS lane (165 MHz character clock) in default mode. With programmable pre-emphasis enabled via PES1/PES0 pins, it achieves up to 2.25 Gbit/s per lane (225 MHz character clock) to compensate for channel loss in long-cable or high-loss environments. This performance is validated per DVI v1.0 and HDMI v1.3a electrical specifications.

Does PTN3381BBS,518 require external termination resistors on the TMDS input side?

No, the PTN3381BBS,518 integrates 50 Ω self-biasing termination resistors on all four IN_Dx± differential inputs. These terminations are automatically enabled when OE_N is asserted LOW. External AC coupling capacitors are still required per input pair, but no external termination resistors are needed - simplifying layout and reducing BOM count.

How does the integrated 5 V regulator in PTN3381BBS,518 operate, and what external components are required?

The PTN3381BBS,518's onboard 5 V regulator operates from the 3.3 V VDD supply and delivers up to 75 mA with ±300 mV accuracy. It requires only two external ceramic capacitors: one between CP (pin 36) and CN (pin 35), and another from V5OUT (pin 34) to GND. An ESR < 100 mΩ capacitor is recommended and must be placed close to the respective pins for stable regulation.

Can PTN3381BBS,518 be used in both HDMI and DVI dongles, and how does DDET pin configuration differ?

Yes, PTN3381BBS,518 supports both HDMI and DVI dongles. For HDMI dongles, the DDET pin (pin 4) must be tied HIGH to enable I²C-based dongle detection per DisplayPort interoperability guidelines. For DVI dongles, DDET must be tied LOW to disable this function. Leaving DDET floating is prohibited - it must be connected to VDD or GND via direct connection or resistor.

What protection features does PTN3381BBS,518 provide for sink-side interfaces when the device is unpowered?

The PTN3381BBS,518 provides comprehensive back-current protection on all sink-side interfaces: TMDS outputs (OUT_Dx±), DDC I/Os (SCL_SINK/SDA_SINK), and HPD_SINK. When unpowered, these terminals present high impedance and sink negligible leakage current (< 1 µA), preventing backdrive from a powered monitor into the source-side circuitry or power supply - ensuring robust operation in real-world adapter use cases.