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• The Lenovo ThinkPad 45 W adapter ADLX45NLC3A leaves the power brick with a three-wire cable that terminates in the proprietary yellow “Slim-Tip”/rectangular plug.
• Inside the cable you will find
– +20 V (red or white core) – routed to the wide metal contact on the upper inner face of the plug.
– GND / 0 V (black core + overall braid) – routed to the opposite wide metal contact and to the external metal shell.
– ID / SENSE (thin blue or green wire) – routed to the single, recessed centre pin. Inside the moulded plug this line is tied to GND through a precision resistor of ≈ 240–300 Ω (nominal ≈ 260 Ω for the 45 W class).
• Viewed into the male plug on the charger (cable coming toward you, plastic tongue up):
┌───────────────────────────────┐
│ Wide blade = +20 V (V+) │ ← upper inner plate
│ │
│ • Centre pin = ID/SENSE │
│ │
│ Wide blade = GND (0 V) │ ← lower inner plate
└───────────────────────────────┘
Outer metal shroud = GNDElectrical characteristics
• Output: 20 V DC ±5 %, 2.25 A (45 W).
• Identification: the laptop biases the ID pin (typically with 3.3 V through ≈10 kΩ) and measures the resulting voltage to deduce the resistor value – hence the wattage. Losing the ID path does not stop the laptop from running, but it will stop or severely limit battery charging and may throttle CPU.
Internal cable construction
• Coax-style pair or triad:
– 18–20 AWG stranded copper for V+.
– Braided shield plus drain wire for GND.
– 28–30 AWG stranded colour-coded wire for ID.
• Ferrite core close to the brick for EMI compliance.
• Over-moulded Slim-Tip plug with embedded SMD resistor (soldered between ID and GND pads).
Typical ID-resistor coding (measured on genuine Lenovo supplies)
| Nominal power | R(ID-GND) | Measured range |
|---|---|---|
| 45 W | ≈260 Ω | 240–300 Ω |
| 65 W | ≈550 Ω | 500–600 Ω |
| 90 W | ≈1.00 kΩ | 0.9–1.1 kΩ |
| 135 W | ≈1.50 kΩ | 1.4–1.7 kΩ |
(Values an order of magnitude higher than 10 Ω avoid excessive current; some older tables erroneously quote “120 Ω” – that would dissipate ≈ 0.9 W at 3 V and is not used in production chargers.)
• Lenovo is migrating all new ThinkPads to USB-C PD; Slim-Tip production continues only for service parts and low-cost lines.
• After-market USB-C-to-Slim-Tip trigger cables embed the correct 260 Ω resistor so that a 20 V PD source is accepted as a 45 W Lenovo adapter.
• Counterfeit adapters frequently omit or mis-value the resistor – a common cause of “plugged in, not charging”.
Example multimeter check
Analogy: Think of the ID resistor as a “barcode” read by measuring its value; if the code is missing (open circuit) the laptop refuses to “check out”.
• Use only certified replacement parts; sub-standard wall supplies are a fire hazard.
• Respect Lenovo’s patent on the Slim-Tip mechanical design when manufacturing adapters.
• If re-cabling: keep leads as short as original, maintain shield continuity, and pot the resistor area to prevent corrosion.
• Use heat-shrink + epoxy, not PVC tape, near the moulded plug – strain relief is critical.
• After any repair always do the two tests above (20 V output, ≈260 Ω ID).
• Some early Edge-series ThinkPads used a two-plate Slim-Tip without a centre pin; those chargers will power but not charge newer ThinkPads.
• Measured resistor values may drift ±10 % with temperature – design tolerances in the EC firmware allow for this.
• Review Lenovo hardware maintenance manual (HMM) for your exact ThinkPad model – it contains the DC-in jack schematic.
• Look at USB-C PD to Slim-Tip adapters as a modern replacement strategy.
• Investigate one-wire identification schemes (Dallas/Maxim) for higher-power > 240 W Lenovo “Slim” (rectangular 6-pin) connectors used on workstations.
The ADLX45NLC3A supplies +20 V through the upper blade of the yellow Slim-Tip, returns through the lower blade/shell, and presents ≈ 260 Ω between the centre ID pin and ground so the laptop recognises a 45 W adapter. Correct wiring of these three conductors – and preservation of the ID resistor – is essential for full operation and safe charging.