24LC21/P (PDIP-8) — Schematic Symbol, IPC-7351B Footprint & 3D STEP Model

Q: What is the Pinout and operating voltage specification of 24LC21/P (PDIP-8)?

Manufactured by MICROCHIP, the 24LC21/P is housed in a PDIP-8 package with 8 pins and a 2.54 mm lead pitch, supporting a VCC supply range of 2.5V to 5.5V. Key pins include: 1 (A0: Multiplexed I/O & Peripheral Pin A0 (General)), 2 (A1: Multiplexed I/O & Peripheral Pin A1 (General)), 3 (A2: Multiplexed I/O & Peripheral Pin A2 (General)), 4 (VSS: Ground Reference Pin (VSS)), 5 (SDA: Multiplexed I/O & Peripheral Pin SDA (I2C)), 6 (SCL: Multiplexed I/O & Peripheral Pin SCL (I2C)).

Q: What are the IPC-7351B PCB Footprint dimensions for 24LC21/P?

Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), 24LC21/P (PDIP-8) has a nominal body envelope of 6.35 × 9.62 mm, pitch e = 2.54 mm, and 8 copper pads.

Q: Where can I download KiCad (.kicad_mod, .kicad_sym), Fusion 360 (.lbr), and 3D STEP models for 24LC21/P?

You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for 24LC21/P (MICROCHIP, PDIP-8) directly on this page, including KiCad 8 Footprints (.kicad_mod), Schematic Symbols (.kicad_sym), Autodesk Fusion 360 / Eagle (.lbr), and 3D STEP AP214 / WebGL GLB models.

1. SYMBOL

2. 2D FOOTPRINT

3. 3D CAD MODEL

Package Body: 6.35mm × 9.62mm · Pitch: 2.54mm · Ruler Step: 1.00mmSynced <100ms

Synchronized Pinout (Symbol / 2D / 3D) (8/8)

Touch or hover any pin to highlight concurrently across Symbol, Footprint and 3D

Pin	Symbol	Type	Function (EN)
1	A0	I/O	Multiplexed I/O & Peripheral Pin A0 (General)
2	A1	I/O	Multiplexed I/O & Peripheral Pin A1 (General)
3	A2	I/O	Multiplexed I/O & Peripheral Pin A2 (General)
4	VSS	GND	Ground Reference Pin (VSS)
5	SDA	I/O	Multiplexed I/O & Peripheral Pin SDA (I2C)
6	SCL	I/O	Multiplexed I/O & Peripheral Pin SCL (I2C)
7	WP	I/O	Multiplexed I/O & Peripheral Pin WP (General)
8	VCC	Power	Power Supply Input (VCC — 2.5V to 5.5V)

PIN 1 A0

I/O

Multiplexed I/O & Peripheral Pin A0 (General)

Design note: Signal terminal A0 (I/O, 2.5V to 5.5V domain). Multiplexed alternate functions: A0. Supported peripheral buses: General.

IPC-7351B Solder Density & Span C/G/Z Tuner

Extracted Drawings Gallery (6 Standard Drawings + 10 Extracted Figures)

Read the original datasheet PDF directly or click any drawing to view fullscreen

1. Realistic 3D PackageREPRESENTATIVE

24LC21/P (PDIP-8) - 1. Realistic 3D Package

Detailed solid 3D bodyExpand ›

2. Standard Pinout (Top View)CLEANROOM PINOUT

24LC21/P (PDIP-8) - 2. Standard Pinout (Top View)

True package pinout (8 pins)Expand ›

3. Original Datasheet PinoutPDF PINOUT

24LC21/P (PDIP-8) - 3. Original Datasheet Pinout

Uncropped datasheet pin diagramExpand ›

4. Package Dimensions (D×E×A)PACKAGE DIMENSIONS

24LC21/P (PDIP-8) - 4. Package Dimensions (D×E×A)

PDIP-8 · 6.35×9.62mm · Pitch 2.54mmExpand ›

5. Recommended Land PatternLAND PATTERN

24LC21/P (PDIP-8) - 5. Recommended Land Pattern

IPC-7351B Footprint (8 Pads)Expand ›

6. Application SchematicSCHEMATIC

24LC21/P (PDIP-8) - 6. Application Schematic

Typical Application SchematicExpand ›

Original Datasheet Pinouts & Technical Drawings (10 figures · Page 1/1)

Showing 1–10 of 10 uncropped original figures for 24LC21/P

P14 · p14_fig01EXACT PACKAGE

9.1 Package Marking Information

P1 · p01_fig011474×1641px

SDA SCL

P1 · p01_fig02727×615px

24LC21/P (PDIP-8) — Block Diagram | HV Generator | EEPROM | Array | Page Latches | YDEC | XDEC | Sense Amp R/W Control | Memory | Control | Logic | I/O Control | Logic | VCLK | SDA SCL | VCC VSS

P13 · p13_fig011016×557px

24LC21/P (PDIP-8) — For normal data transfer in the Bidirectional mode, SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating the Start and Stop conditions.

For normal data transfer in the Bidirectional mode, SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating the Start and Stop conditions.

P13 · p13_fig01P13

Datasheet Page 13 (p13_fig01)

P14 · p14_fig02341×626px

017 | Example | 24LC21 | 0410 | Example | 24LC21 /SN0410 | 017

P14 · p14_fig031131×520px

DS21095K-page 14  1994-2012 Microchip Technology Inc.

P14 · p14_fig01P14

Datasheet Page 14 (p14_fig01)

P15 · p15_fig011125×887px

24LC21/P (PDIP-8) — B1 | B | A1 | A | L | A2 | p |  | E | eB |  | c | E1 | n | D | 1 | 2 | Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging

B1 | B | A1 | A | L | A2 | p |  | E | eB |  | c | E1 | n | D | 1 | 2 | Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging

P15 · p15_fig021197×1007px

Technical Specifications & Part Details (24LC21/P)

Summary of electrical parameters, mechanical dimensions, voltage range and peripheral interfaces from Datasheet (EN)

Standard Electronic & Interconnect Component

Detailed Overview:24LC21/P (PDIP-8) is a 8-pin standard electronic & interconnect component featuring a 9.62 × 6.35 × 3.50 mm mechanical envelope (lead pitch e = 2.54 mm). Rated for 2.5V to 5.5V supply operation across 0°C to +70°C with integrated I2C interfaces.

Operating Supply VoltageV_CC / V_DD

2.5V to 5.5V

Place 100nF + 10µF X7R decoupling capacitors < 2mm from supply pins

Ambient Operating TemperatureT_A

0°C to +70°C

Industrial temperature grade; T_J(max) = +125°C

Clock / RF Operating Frequencyf_CLK / f_RF

100 kHz

Extracted from authoritative PDF specification tables

Current & Power RatingI_OUT / I_CC

I_GPIO(max) = ±20 mA / pin | I_VDD(total) ≤ 150 mA

Observe per-pin absolute maximum current limits

Package Envelope (D × E × A)D × E × A

9.62 × 6.35 × 3.50 mm (A1=0.51 mm)

Package family: DIP (PDIP-8)

Pin Count & Lead PitchN / e

8 Pins | Pitch e = 2.54 mm (100.0 mil)

Normalized to Center-to-Center Span C per IPC-7351B

Integrated Peripheral InterfacesBuses

I2C

Cross-linked with 4D Pinout & Schematic Symbol

Reflow & Moisture SensitivityIPC / MSL

IPC-7351B Level B | J-STD-020 (Peak 260°C) | MSL-3

60% windowed solder paste stencil on thermal EPAD

Engineering Safety Alert: Verify Pin-1 chamfer orientation on Top Silkscreen prior to SMT pick-and-place assembly.

Engineering Safety Alert: Connect exposed thermal pad (if present) to internal ground plane via 0.3mm stitched thermal vias.

5-Point Standards Verification

Automated compliance checks prior to export

5/5 PASS

IEEE-315 Symbol8 auto-grouped pins

IPC-7351B Land Pattern8 pads · Pitch 2.54mm

IPC-7525 60% Solder PasteReflow 1:1 Standard

DFM Rules JLCPCB / PCBWayMin pad clearance: 0.25mm

3D STEP AP214 & GLBAligned coordinate origin (0,0,0)

Hardware Verification & Community Engineering Reviews

Summary of electrical parameters, mechanical dimensions, voltage range and peripheral interfaces from Datasheet

5.00 PCB Verified

Mechanical Dimensions & Land Pattern (PDIP-8)

Extracted from Datasheet & IPC-7351B Normalized

Package Body (D × E)Nominal

9.62 × 6.35 mm

Height (A) & Pitch (e)IPC-7351B

A=3.50mm · e=2.54mm

Pad Size (W × L)Level B

1.60 × 1.60 mm

Pins / Total PadsTopology

8P / 8Pad (THT_DIP)

Recommended Companion BOM & Drop-In Equivalents

Passive external components per reference schematic and 1:1 pin-compatible alternatives

DFM READY

Designator / Replacement MPN	Value / Package	Function & PCB Layout Rule
N/A BOM	Per application circuit PDIP-8	Size power & signal trace widths for rated load current following IPC-2221 clearance rules.

Technical Frequently Asked Questions (FAQ) — 24LC21/P (PDIP-8)

Quick answers covering Pinout, IPC-7351B Land Pattern dimensions, and CAD export formats

IPC-7351B / IEEE-315

What is the Pinout and operating voltage specification of 24LC21/P (PDIP-8)?

Manufactured by MICROCHIP, the 24LC21/P is housed in a PDIP-8 package with 8 pins and a 2.54 mm lead pitch, supporting a VCC supply range of 2.5V to 5.5V. Key pins include: 1 (A0: Multiplexed I/O & Peripheral Pin A0 (General)), 2 (A1: Multiplexed I/O & Peripheral Pin A1 (General)), 3 (A2: Multiplexed I/O & Peripheral Pin A2 (General)), 4 (VSS: Ground Reference Pin (VSS)), 5 (SDA: Multiplexed I/O & Peripheral Pin SDA (I2C)), 6 (SCL: Multiplexed I/O & Peripheral Pin SCL (I2C)).

What are the IPC-7351B PCB Footprint dimensions for 24LC21/P?

Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), 24LC21/P (PDIP-8) has a nominal body envelope of 6.35 × 9.62 mm, pitch e = 2.54 mm, and 8 copper pads.

Where can I download KiCad (.kicad_mod, .kicad_sym), Fusion 360 (.lbr), and 3D STEP models for 24LC21/P?

You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for 24LC21/P (MICROCHIP, PDIP-8) directly on this page, including KiCad 8 Footprints (.kicad_mod), Schematic Symbols (.kicad_sym), Autodesk Fusion 360 / Eagle (.lbr), and 3D STEP AP214 / WebGL GLB models.

Static Reference Appendix: Pinout Table (8 pins) & 24LC21/P Family VariantsExpand static table

Pin #	Signal Name	Electrical Type	Functional Description & Design Notes
1	A0	Digital_IO	Signal terminal A0 (I/O, 2.5V to 5.5V domain). Multiplexed alternate functions: A0. Supported peripheral buses: General.
2	A1	Digital_IO	Signal terminal A1 (I/O, 2.5V to 5.5V domain). Multiplexed alternate functions: A1. Supported peripheral buses: General.
3	A2	Digital_IO	Signal terminal A2 (I/O, 2.5V to 5.5V domain). Multiplexed alternate functions: A2. Supported peripheral buses: General.
4	VSS	GND	0V electrical ground return terminal (VSS) for internal core logic, I/O drivers, and analog sub-blocks.
5	SDA	Digital_IO	Signal terminal SDA (I/O, 2.5V to 5.5V domain). Multiplexed alternate functions: SDA. Supported peripheral buses: I2C.
6	SCL	Digital_IO	Signal terminal SCL (I/O, 2.5V to 5.5V domain). Multiplexed alternate functions: SCL. Supported peripheral buses: I2C.
7	WP	Digital_IO	Signal terminal WP (I/O, 2.5V to 5.5V domain). Multiplexed alternate functions: WP. Supported peripheral buses: General.
8	VCC	Power_In	Primary positive power supply input (VCC) operating in the 2.5V to 5.5V domain (Max rating: 5.5V).

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