The PLCC-32 package is a rectangular plastic leaded chip carrier with 32 J-leads at the standard 1.27 mm PLCC pitch, registered under JEDEC MS-016, variation AE. Unlike the square 20-, 28-, and 44-lead PLCC sizes, PLCC-32 is genuinely rectangular — that distinction matters for footprint layout. It’s the package most parallel EPROMs and early flash memory shipped in; the Atmel/Microchip AT27C010 is a clearly documented example used throughout this page for dimensions and pinout.
Key takeaways
- JEDEC MS-016, variation AE. PLCC-32 is rectangular, not square: the two body sides have different dimensions (D/E), unlike PLCC-20, -28, or -44.
- Lead-tip span: 12.319–12.573 mm on the short side, 14.859–15.113 mm on the long side. Lead pitch is the standard 1.27 mm.
- PLCC-32 doesn’t have one fixed pinout — it depends on the IC — but 32-lead parallel EPROM/EEPROM parts follow a highly consistent address/data/control layout, documented below using the AT27C010.
- Unlike PLCC-20 and PLCC-28, the 32-lead package has no unused corner positions on this EPROM pinout — all 32 physical leads carry a signal, including one explicit NC pin.
- The classic through-hole and SMT Adam Tech PLCC-32-AT sockets are both discontinued; Yamaichi’s IC120-0324-309 is an active alternative, but it’s a test/burn-in socket, not a permanent board-mount part.
PLCC-32 Dimensions
Atmel/Microchip’s own AT27C010 package drawing, labeled “32J” and stated to conform to JEDEC MS-016, variation AE, gives the clearest primary-source numbers. Because the package is rectangular, it carries two body dimensions instead of one: D/D1/D2 for the short side and E/E1/E2 for the long side.
| Parameter | Value | Note |
| JEDEC outline | MS-016, variation AE | The rectangular PLCC-32 outline |
| Lead count | 32 | |
| Short-side lead-tip span (D) | 12.319–12.573 mm | |
| Short-side body-only span (D1) | 11.354–11.506 mm | Excludes mold protrusion |
| Long-side lead-tip span (E) | 14.859–15.113 mm | |
| Long-side body-only span (E1) | 13.894–14.046 mm | Excludes mold protrusion |
| Lead pitch (e) | 1.27 mm TYP | |
| Lead width (B1) | 0.330–0.533 mm | |
| Overall height (A) | 3.175–3.556 mm | |
| Standoff (A1) | 1.524–2.413 mm |
Distributor listings for the same part cross-check this: one lists the AT27C010 body as 14.04 x 11.5 mm, and a GlobalSpec listing for a different manufacturer’s 32-lead PLCC flash part gives 13.97 x 11.43 mm — both consistent with the E1/D1 body-only range above. When you’re comparing PLCC-32 parts across manufacturers, confirm which of the two sides (D or E) a distributor’s single “width x length” figure refers to before assuming footprint compatibility.
Worked example: at the 1.27 mm pitch, a 0.533 mm maximum lead width leaves a 0.737 mm minimum gap between adjacent lead edges (1.27 mm − 0.533 mm) — the same margin that applies to every PLCC size, since lead width and pitch don’t scale with lead count. A 0.6–0.7 mm solder pad keeps a hand-soldered joint inspectable without bridging.
PLCC-32 Pinout
PLCC-32 has no single fixed pinout — function depends on the IC — but 32-lead parallel EPROM and EEPROM parts follow a well-established address/data/control layout. The AT27C010 (1 Mb, 128K x 8 OTP EPROM) is a documented example, and its datasheet gives the full 32-lead PLCC top-view assignment directly:
| Pin | Function | Pin | Function |
| 1 | VPP | 17 | O3 |
| 2 | A16 | 18 | O4 |
| 3 | A15 | 19 | O5 |
| 4 | A12 | 20 | O6 |
| 5 | A7 | 21 | O7 |
| 6 | A6 | 22 | CE |
| 7 | A5 | 23 | A10 |
| 8 | A4 | 24 | OE |
| 9 | A3 | 25 | A11 |
| 10 | A2 | 26 | A9 |
| 11 | A1 | 27 | A8 |
| 12 | A0 | 28 | A13 |
| 13 | O0 | 29 | A14 |
| 14 | O1 | 30 | NC |
| 15 | O2 | 31 | PGM |
| 16 | GND | 32 | VCC |
A0–A16 are address inputs, O0–O7 are data outputs, CE is chip enable, OE is output enable, PGM is the program strobe (used only during programming), and pin 30 is a genuine no-connect — not an unused package corner the way PLCC-20 and PLCC-28 have. Confirm pin function against the exact part’s own datasheet before laying out a board; other 32-lead PLCC ICs (SRAM, flash, logic) use this footprint with different pin assignments.
PLCC-32 Sockets
As with dimensions, socket choice on PLCC-32 splits into permanent board-mount parts and test/burn-in parts — and right now, the classic board-mount option is gone.
| Parameter | Adam Tech PLCC-32-AT / -AT-SMT | Yamaichi IC120-0324-309 |
| Application | Permanent board-mount socket | Test / burn-in socket |
| Mounting | Through hole or SMT (both variants discontinued) | Through hole |
| Mating pitch | 0.050 in (1.27 mm) | 1.27 mm |
| Contact material / plating | Phosphor bronze | Beryllium copper, gold over nickel |
| Current rating | 1 A | 1 A |
| Voltage rating | not stated by this distributor listing | 100 V AC rms / 150 V DC |
| Insulation resistance | not stated by this distributor listing | 1,000 MΩ |
| Mating cycles | not specified | 10,000 insertions min (IC120 series) |
| Lifecycle status | Obsolete / no longer manufactured (both variants) | Active |
The lifecycle gap here is total, not partial: both the through-hole Adam Tech PLCC-32-AT and its surface-mount sibling PLCC-32-AT-SMT are marked no longer manufactured at DigiKey. If a BOM calls for a permanent board-mount PLCC-32 socket, check current stock and lifecycle status across multiple connector manufacturers before committing — don’t assume a same-family part number in a different pin count is still available just because the -AT series name is familiar. The Yamaichi part above is a genuine alternative for test and programming use, not a like-for-like production-board substitute.
Choosing Between Direct Solder and a Socket
- Production board, part won’t be swapped after assembly → solder the PLCC-32 directly; verify current board-mount socket availability first if a socket is truly required.
- Bring-up board, or the part is a UV-erasable or field-reprogrammable EPROM/EEPROM → a through-hole or SMT commercial socket, sourced and lifecycle-checked before the build, not assumed available.
- Test, burn-in, or programmer fixture → a dedicated test socket like the Yamaichi IC120 series, rated for a stated mating-cycle count.
FAQ
What are the dimensions of a PLCC-32 package?
Per JEDEC MS-016 variation AE, the PLCC-32 is rectangular: short-side lead-tip span 12.319–12.573 mm, long-side lead-tip span 14.859–15.113 mm, with a 1.27 mm lead pitch.
Is PLCC-32 square or rectangular?
Rectangular. Unlike PLCC-20, PLCC-28, and PLCC-44, which are square, PLCC-32 has two different body-side dimensions — roughly 11.4 mm x 13.9 mm body-only, per the JEDEC MS-016-AE outline.
Does PLCC-32 have a standard pinout?
No — pin function depends on the IC. 32-lead parallel EPROM/EEPROM parts follow a consistent address/data/control layout, documented here using the AT27C010, with pin 1 as VPP, pin 16 as GND, and pin 32 as VCC.
What socket fits a PLCC-32 package?
Any socket built to JEDEC MS-016 variation AE at 1.27 mm pitch. Adam Tech’s PLCC-32-AT and PLCC-32-AT-SMT board-mount sockets are both discontinued; Yamaichi’s IC120-0324-309 is an active alternative for test and programming use.
What is the lead pitch on a PLCC-32?
1.27 mm (0.05 in), the same fixed pitch used across every JEDEC PLCC size from 20 to 84 leads, regardless of the rectangular body shape.
The Decision
Treat PLCC-32 dimensions with more care than the square sizes: because the package is rectangular, a single “body width” figure from a distributor listing isn’t enough — confirm which side it refers to against the JEDEC MS-016-AE D/E dimensions before finalizing a footprint. For pinout, use the address/data/control pattern shown here as a starting point but pull the exact assignment from the specific IC’s datasheet. For sourcing, don’t assume a board-mount socket is available: the standard through-hole and SMT options for this size are both discontinued, and a genuine production-ready replacement needs to be confirmed in stock before the BOM is finalized.
