In the secondary market, the AD819 series splits into two process routes—LD and PD. Before selecting, confirm which one matches your product.
The AD819-LD uses eutectic bonding. Eutectic bonding relies on a gold-tin alloy forming a metallurgical joint at high temperature, with no intermediate adhesive. The thermal path is short. For high-power LEDs and laser diodes with demanding heat dissipation requirements, this is the more suitable route.
The AD819-PD is a dispensing die bonder. It uses adhesive to fix the die onto the substrate, suited to standard LED packaging or applications requiring a specific bond line thickness. The PD's flexibility lies in adjustable dispense volume and a relatively wider process window.
Both models share the same motion platform and vision system. The differences sit mainly in the bond head and feeding mechanism. After years of depreciation, the platform's commonality remains, but bond head wear and spare parts supply must be evaluated separately.
Core Specifications at a Glance
| Item | AD819-LD | AD819-PD |
|---|---|---|
| Bonding process | Eutectic | Dispensing |
| Suitable devices | High-power LEDs, laser diodes | Standard LEDs, specific bond line requirements |
| Rated accuracy | ±15 µm @ 3σ | ±15 µm @ 3σ |
| Rated throughput | Up to 70K/H | Up to 70K/H |
| TO-can support | Yes | Yes |
| Key wear parts | Bond head, heater stage | Dispensing system, dispense valve |
| Secondary market focus | Temperature and pressure control stability | Dispense volume consistency |
The accuracy and throughput figures above are published nominal values for the series. Actual performance depends on machine condition and process parameters.
Is the Accuracy Enough
The AD819 series carries a rated accuracy of ±15 µm @ 3σ. That figure isn't standout among today's die bonders, but for LED and small-to-medium optoelectronic packaging, repeatability in production matters more than the极限 value of a single placement.
On throughput, the rated 70K/H is based mainly on standard LED die. Actual output varies with die size, feeding method, and process parameters. For used equipment, speed depends on mechanical wear—the paper spec is only a reference ceiling.
TO-can Handling Is a Plus
The AD819 series supports TO-can packaging. TO-can is common in optical communication devices and sensor packaging, where die placement demands additional concentricity and angular accuracy. If your product mix extends beyond standard LED frames, this capability has real value.
What to Verify When Buying Used
The AD819 platform dates to around 1999, and machines circulating on the secondary market are generally old. Some listings show units marked as 2010, while machines from around 2001 are also in circulation. The age range is wide, and individual condition varies significantly.
For the eutectic model (LD), focus on the bond head. Eutectic bonding demands high stability in temperature and pressure control, and bond head wear directly affects joint quality. Also verify the heater stage's temperature uniformity and control accuracy are still within spec.
For the dispensing model (PD), focus on the dispense system. Dispense volume consistency depends on the sealing integrity and drive precision of the feeding mechanism. Seal aging causes volume drift—a common issue in used equipment.
On electrical and software aspects, the AD819 control system is PLC-based. Some units may require confirmation of software licensing and spare parts availability. For machines over two decades old, electrical component aging and software compatibility are real risks.
What Kind of Line It Suits
If your products are mainly standard LED packages, accuracy requirements sit within ±15 µm, and you can absorb maintenance effort, a well-maintained used AD819 can handle production capacity. The eutectic model suits power devices with heat dissipation needs; the dispensing model suits general LED packaging.
If automotive-grade devices or high-precision optoelectronic packaging are involved—with hard requirements on solder void rate and long-term consistency—the actual capability of a used machine needs to be verified with operating data, not nominal specs.
