Apple will manufacture its base iPhone 18 A20 chip and premium iPhone 18 Pro A20 Pro processor from the exact same silicon die design.
According to leaked manufacturing information detailed by technology retailer Jabko, the distinction between the standard A20 chip and the higher tier A20 Pro will be established during factory testing rather than through separate production lines.
The underlying fabrication strategy relies on semiconductor binning, a long standing industry process where manufactured microchips are tested and sorted based on their functional integrity and electrical performance. Apple relies on contract chipmaker Taiwan Semiconductor Manufacturing Company, known as TSMC, to fabricate its custom processors using cutting edge manufacturing nodes.
Silicon wafer sorting process
Production of the upcoming A20 series takes place on silicon wafers measuring 300 millimetres in diameter using TSMC N2 two-nanometer process nodes. At such minuscule fabrication tolerances, microscopic dust particles in the photoresist layer or mask alignment shifts of fractions of a nanometer can damage delicate circuit elements.
Because the probability of producing defect free silicon drops exponentially as chip surface area increases, virtually no silicon wafer emerges from the manufacturing line without imperfections. To evaluate each chip before the wafer is sliced into individual dies, technicians perform a probe test using ultra thin needles connected to the contact pads of every crystal.
The probe test measures key operational parameters, identifying which central processing unit cores, graphics processing unit cores, and neural accelerator engine blocks function correctly. It also records the precise voltage required for the chip to reach target operating frequencies and measures idle leakage current, which represents wasted electrical energy.
Hardware disabling of damaged cores
Chips with completely undamaged circuit blocks and superior electrical metrics are categorized as A20 Pro processors for the iPhone 18 Pro models. Chips containing minor localized flaws are designated as standard A20 processors for the base iPhone 18.
To prevent minor manufacturing defects from forcing an entire chip to be discarded as scrap, Apple builds structural redundancy directly into its silicon designs. The crystal layout includes extra cache memory rows and more processor cores than the base version requires. When a probe test detects a localized flaw, an electrical current pulse burns out a tiny micro-fuse, permanently disabling the damaged block and removing it from the chip resource map.
Apple previously employed this physical disabling technique with its M1 processor family. The entry level M1 MacBook Air shipped with a seven-core graphics processing unit, while higher tier configurations featured an eight-core graphics processing unit, despite both versions being built on identical physical silicon dies.
Voltage limits and thermal performance
Electrical voltage requirements form the second major axis of chip sorting. Even defect-free silicon crystals exhibit slight physical variations, causing some chips to achieve target clock frequencies at low voltages while others demand higher power levels.
This variation is critical because processor power consumption increases proportionally to the square of the operating voltage. Chips operating at lower voltages consume less energy and generate less internal heat under heavy workloads. Consequently, lower thermal output allows the higher tier A20 Pro chips to sustain peak clock frequencies for extended periods without initiating thermal throttling.
Lower tier A20 chips remain fully functional within Apple specified parameters and are not considered defective products. By implementing chip binning across the entire silicon wafer, manufacturers avoid discarding partially impaired dies, preventing consumer electronics prices from escalating significantly.
Consumer impact and upcoming launch
For everyday smartphone users, the performance gap between the standard A20 and A20 Pro chips will remain imperceptible during routine tasks such as text messaging or automatic camera capture, where the absence of a single graphics core has no noticeable impact.
In contrast, demanding applications will highlight the hardware differences. The full complement of graphics cores and Neural Engine modules in the A20 Pro processor accelerates video rendering times, while superior thermal headroom enables stable frame rates during prolonged high end gaming sessions.
Apple is expected to officially declare the precise clock frequencies and performance specifications for the A20 and A20 Pro processors during its formal product presentation, according to Jabko specialists.
