diff --git a/chipflow/packages.py b/chipflow/packages.py
index 961dd94a..a488bb19 100644
--- a/chipflow/packages.py
+++ b/chipflow/packages.py
@@ -7,12 +7,45 @@
 
 from .packaging import QuadPackageDef, BareDiePackageDef, GAPackageDef, Package, OpenframePackageDef
 
-# Add any new package types to both PACKAGE_DEFINITIONS and the PackageDef union
+# Add any new package types to both PACKAGE_DEFINITIONS and the PackageDef union.
+# Europractice quad packages use the QuadPackageDef pin numbering (CCW from
+# top-left) which matches EP's GDS labels. EP-specific cell names, layer
+# conventions and pin_map strings live in chipflow-backend's packaging_klayout
+# plugin (data/ep_packages.json), keeping this library vendor-agnostic.
 PACKAGE_DEFINITIONS = {
-    "pga144": QuadPackageDef(name="pga144", width=36, height=36),
-    "cf20": BareDiePackageDef(name="cf20", width=7, height=3),
-    "bga144": GAPackageDef(name="bga144", width=36, height=36),
-    "openframe": OpenframePackageDef()
+    # Bare die / generic
+    "cf20":      BareDiePackageDef(name="cf20",      width=7,  height=3),
+    "openframe": OpenframePackageDef(),
+
+    # PGA — perimeter pin grid arrays
+    "pga84":     QuadPackageDef(name="pga84",   width=21, height=21),
+    "pga100s":   QuadPackageDef(name="pga100s", width=25, height=25),
+    "pga100l":   QuadPackageDef(name="pga100l", width=25, height=25),
+    "pga120":    QuadPackageDef(name="pga120",  width=30, height=30),
+    "pga144":    QuadPackageDef(name="pga144",  width=36, height=36),
+    "pga208":    QuadPackageDef(name="pga208",  width=52, height=52),
+    # pga256 — staggered double-row, deferred (see ep_packages.json _todo_v2_)
+
+    # QFP / CERQUAD
+    "qfp64":     QuadPackageDef(name="qfp64",   width=16, height=16),
+    "qfp120":    QuadPackageDef(name="qfp120",  width=30, height=30),
+    "qfp160":    QuadPackageDef(name="qfp160",  width=40, height=40),
+    "qfp208":    QuadPackageDef(name="qfp208",  width=52, height=52),
+
+    # QFN — QuadPackageDef requires height // 2 > 3 (min 8 pins/side) for its
+    # bringup power-pin allocation, so qfn16 and qfn24 are intentionally absent.
+    # Their EP descriptors remain in ep_packages.json for documentation.
+    "qfn32":         QuadPackageDef(name="qfn32",        width=8,  height=8),
+    "qfn40_6x6":     QuadPackageDef(name="qfn40_6x6",    width=10, height=10),
+    "qfn48":         QuadPackageDef(name="qfn48",        width=12, height=12),
+    "qfn56":         QuadPackageDef(name="qfn56",        width=14, height=14),
+    "qfn64_9x9":     QuadPackageDef(name="qfn64_9x9",    width=16, height=16),
+    "qfn80_12x12":   QuadPackageDef(name="qfn80_12x12",  width=20, height=20),
+    "qfn88_10x10":   QuadPackageDef(name="qfn88_10x10",  width=22, height=22),
+    "qfn100_12x12":  QuadPackageDef(name="qfn100_12x12", width=25, height=25),
+
+    # BGA — ball grid array (different geometry class)
+    "bga144":    GAPackageDef(name="bga144", width=36, height=36),
 }
 
 Package.model_rebuild()