Where can I buy a 3.4 inch 480x480 TFT display module?

DisplayModule lists the DM-TFT34-486, a 3.4 inch 480x480 transmissive tft display and provides its official DM-TFT34-486 datasheet. Use that product page to check availability and request samples or a production quote. Before ordering, match the exact module to your enclosure, host interface and power design: screen size and resolution alone do not establish compatibility.

Start with the exact part, not just the screen size

The safe buying route is to match the product name, SKU, and datasheet before you place a sample order or ask for a production quote. DisplayModule identifies the part as DM-TFT34-486, a 3.4-inch transmissive TFT LCD with 480 × 480 pixels. The datasheet describes the active display area as 60.48 × 60.48 mm, with a module outline of about 65.72 × 69.64 × 2.45 mm. The active area is the visible pixel region; the module outline determines enclosure clearance. Leave room for the FPC and use the supplier’s mechanical drawing and tolerances before committing to tooling.

For a prototype, the product page is the practical entry point: confirm the SKU, download the datasheet, and then buy or request a quote through the supplier’s current checkout or quote workflow. For production, use the same page as the starting reference but ask the supplier to confirm stock status, lead time, revision level, lifetime availability, and whether the sample you receive is from the same construction as the production lot.

DM-TFT34-486 specifications to check before purchase

The linked datasheet’s general specifications, pin assignment and electrical tables provide the following starting points. These values apply to DM-TFT34-486; confirm the document revision against the unit you order.

Check item	Datasheet value for DM-TFT34-486	Why it affects buying
Resolution and active area	480(RGB) × 480 pixels; 60.48 × 60.48 mm active area	Check the visible area against your intended graphics and enclosure window.
Module outline	65.72 × 69.64 × 2.45 mm typical	Use this for early fit checks, then verify the mechanical drawing and tolerance stack before tooling.
Controller	ST7701S, chip-on-glass	Your host software and initialization sequence should be planned around ST7701S, not another common TFT controller assumption.
Interface	3-line SPI plus 16/18/24-bit RGB	This is not a simple SPI-only hobby display. RGB timing signals and data bus width must match your host processor.
Touch	Datasheet notes CTP driver: NA and touch type: NA	Do not assume an integrated touch panel. If you need touch, ask for a separate touch option or a different part number.
Logic supply	VCI 2.5–3.6 V, typical 3.3 V; IOVCC 1.65–3.3 V, typical 1.8 V	Check whether your MCU/MPU I/O level is 1.8 V or 3.3 V before routing the bus.
Backlight rail	12 white LEDs; typical 40 mA and about 19.2 V forward voltage	The LED string needs a proper constant-current backlight driver; it is separate from the logic supply.
Temperature range	-20°C to +70°C operating; -30°C to +80°C storage	Compare these limits with the temperature inside your enclosure; a component rating does not establish whole-product suitability.

Interface and pinout checks before ordering boards

The datasheet’s terminal table runs through 45 pins, so avoid ordering a generic off-the-shelf adapter just because another TFT article mentioned one. The useful integration clues are specific: pins 14–37 are the 24-bit RGB data bus, pin 38 is DE, pin 39 is PCLK, pin 40 is HSYNC, and pin 41 is VSYNC. The serial pins include SDO, SDI, SCL, chip select, and reset for the 3-line serial interface/control path. LEDK and LEDA are listed separately near the end of the connector table.

That split changes how you buy accessories. A sample display may be easy to order, but a real prototype still needs a matching FPC connector footprint, a host with RGB LCD timing support, correct reset sequencing, and a backlight driver. If your platform only has a small SPI peripheral and no RGB LCD controller, this module may be a poor fit unless you add an external display bridge or choose a different module with the interface your platform already supports.

Sample purchase versus production purchase

For one or two engineering samples, the buying question is mostly: “Can I get the exact DM-TFT34-486 quickly, with its datasheet and code package?” For production, the question is broader. Ask for the revision code, connector drawing, recommended mating connector, initialization code, optical inspection criteria, packaging method, lead time, and the supplier’s policy for future PCN/EOL notices. If the product page shows a retail price or stock state, treat it as a live storefront signal, not a locked production quotation.

A practical ordering note is to separate the display module from the supporting electronics. The LCD logic supply is in the low-voltage digital range, while the backlight string is a higher-voltage LED load. A 3.3 V logic rail alone cannot supply the datasheet’s approximately 19.2 V LED forward-voltage requirement. Budget a backlight boost/constant-current circuit, dimming method, thermal margin, and EMI checks from the start.

A short checklist to send the supplier

• Confirm the exact orderable part number is DM-TFT34-486 and that the shipped sample matches the datasheet revision linked on the product page.
• Confirm the active area, outline dimensions, FPC orientation, connector pitch, and recommended mating connector before PCB layout.
• Confirm whether the order includes any touch panel; the datasheet lists no integrated touch panel.
• Ask for ST7701S initialization code and RGB timing values for your target bus width: 16-bit, 18-bit, or 24-bit.
• Check whether your processor can output PCLK, HSYNC, VSYNC, DE, and the selected RGB data width at the required timing.
• Design the LED backlight as a separate constant-current load, not as another 3.3 V logic pin.
• For production, request lead time, MOQ, packaging details, change-notice policy, and confirmation that sample and volume units share the same electrical and mechanical revision.

When this module is a practical choice

DM-TFT34-486 is worth evaluating when you need a square 480 × 480 display, its outline fits your enclosure, and your host can provide the required RGB timing and serial initialization. If you need a plug-in SPI-only board or integrated touch, ask for an alternative with those features rather than treating this bare module as interchangeable. Confirm the current quotation and shipped revision before placing the order.