W29EE011P-90 - 1Mb 5V Parallel Flash, 90ns, 32-PLCC | Winbond
MPN: W29EE011P-90 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.523 | $0.52 |
| 10 | $0.49 | $4.90 |
| 100 | $0.45 | $45.00 |
| 500 | $0.42 | $210.00 |
| 1,000 | $0.38 | $380.00 |
W29EE011P-90 Overview
A flash memory is a non-volatile storage technology that retains data when power is removed and supports electrical erase and program cycles in circuit. The W29EE011P-90 sits within the memory IC hierarchy as a parallel NOR flash, distinct from serial SPI flash (fewer pins, lower pin count) and NAND flash (higher density, page/block oriented). Parallel NOR flash is the legacy choice for code storage in 8-bit and 16-bit microcontrollers, EPROM replacement, and firmware boot ROMs where byte-level random access and simple bus interface are required.
The W29EE011P-90 features 90 ns maximum access time, sector/chip erase capability, and CMOS low-power operation. It is designed as a drop-in replacement for legacy 5V EPROMs and standard 1-Mbit flash devices. The 32-PLCC package provides a JEDEC-standard pinout compatible with the industry 1-Mbit parallel flash footprint, simplifying board-level migration from older AMD/Atmel/ST 28F001 or 29EE011 sockets.
Typical applications include embedded firmware storage for industrial controllers, legacy 8051/68HC11/MCS-96 system boot memory, BIOS and firmware update banks, point-of-sale terminals, and industrial PLC code storage. The 90 ns access time supports microcontrollers running at up to approximately 8 MHz without wait states.
When designing with this part, note that the 32-PLCC package requires a PLCC socket or careful reflow profile for surface-mount assembly. Verify the device's command set (byte programming, sector erase, chip erase) against your firmware's flash algorithm before substitution. The part is suitable for 5V-only systems; it does not support 3.3V operation.
Drop-in alternatives for W29EE011P-90 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
W29EE011P-90Z
✅ Drop-In📋 Reference alternative (not in catalog)
W29EE011P-70
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
W29EE011P-55
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SST39SF010A-90-4C-PHE
✅ Drop-In📋 Reference alternative (not in catalog)
AM29F010B-90PEC
✅ Drop-In📋 Reference alternative (not in catalog)
AT29C010A-90PU
✅ Drop-In📋 Reference alternative (not in catalog)
W29EE011P-90 Maximum Ratings & Electrical Characteristics
| Memory Type | Non-volatile NOR Flash |
| Memory Size | 1 Mbit (128K x 8) |
| Organization | 128K bytes |
| Interface | Parallel |
| Access Time | 90 ns |
| Supply Voltage (VCC) | 5 V (single supply) |
| Programming Voltage (VPP) | Not required (5V in-system program/erase) |
| Technology | CMOS |
| Package | 32-pin PLCC (11.43 x 13.97 mm) |
| Sector Erase | Yes (sector architecture per datasheet) |
| Chip Erase | Yes |
| Byte Programming | Yes |
| Mounting Type | Surface Mount (PLCC socket compatible) |
W29EE011P-90 Pin Configuration
| Pin 1 | A16 — Address line 16 (highest address) |
| Pin 2 | A15 — Address line 15 |
| Pin 3 | A12 — Address line 12 |
| Pin 4 | A7 — Address line 7 |
| Pin 5 | A6 — Address line 6 |
| Pin 6 | A5 — Address line 5 |
| Pin 7 | A4 — Address line 4 |
| Pin 8 | A3 — Address line 3 |
| Pin 9 | A2 — Address line 2 |
| Pin 10 | A1 — Address line 1 |
| Pin 11 | A0 — Address line 0 (lowest address) |
| Pin 12 | CE# — Chip Enable (active low) |
| Pin 13 | VSS — Ground |
| Pin 14 | OE# — Output Enable (active low) |
| Pin 15 | DQ0 — Data input/output bit 0 |
| Pin 16 | DQ1 — Data input/output bit 1 |
| Pin 17 | DQ2 — Data input/output bit 2 |
| Pin 18 | DQ3 — Data input/output bit 3 |
| Pin 19 | DQ4 — Data input/output bit 4 |
| Pin 20 | DQ5 — Data input/output bit 5 |
| Pin 21 | DQ6 — Data input/output bit 6 |
| Pin 22 | DQ7 — Data input/output bit 7 |
| Pin 23 | WE# — Write Enable (active low) |
| Pin 24 | A13 — Address line 13 |
| Pin 25 | A14 — Address line 14 |
| Pin 26 | VCC — +5V power supply |
| Pin 27 | A8 — Address line 8 |
| Pin 28 | A9 — Address line 9 |
| Pin 29 | A11 — Address line 11 |
| Pin 30 | A10 — Address line 10 |
| Pin 31 | NC — Not connected (per JEDEC 32-PLCC standard) |
| Pin 32 | NC — Not connected (per JEDEC 32-PLCC standard) |
Typical Applications
W29EE011P-90 is suitable for 6 applications: Embedded 8051 Firmware Storage, Industrial PLC Boot ROM, Legacy EPROM Replacement, POS Terminal Firmware, Automotive ECU Code Memory, Vending Machine Controller.
Embedded 8051 Firmware Storage
The W29EE011P-90 fits 8051 firmware storage because its 128K x 8 organization matches the 16-bit address space (64K) of classic 8051 cores when bank-switched, and the 90 ns access time supports 12 MHz operation without wait states. Parallel byte-wide access avoids the SPI overhead that slows interrupt-driven code fetch. Per the Winbond datasheet, byte programming allows in-system firmware updates without removing the chip. This combination makes it the legacy standard for 8-bit industrial controllers where 1 Mbit of code must be byte-addressable on an 8-bit data bus.
Recommended
Industrial PLC Boot ROM
The W29EE011P-90 is well suited to industrial PLC boot ROM because it operates from a single 5V rail (no 12V VPP), supports in-system reprogramming for field firmware updates, and offers 90 ns access that matches common 16-bit PLC bus architectures without wait states. The 32-PLCC package is socket-compatible with legacy PLC backplanes that originally used 27-series EPROMs, enabling drop-in upgrade of installed equipment. CMOS low-power operation reduces standby consumption in always-on PLC racks.
Recommended
Legacy EPROM Replacement
The W29EE011P-90 is a direct replacement for 5V 128K x 8 EPROMs (27C010) because it shares the JEDEC 32-pin DIP/PLCC pinout, operates from the same single 5V supply, and uses compatible timing. The flash-based design eliminates the UV eraser step required for EPROMs and enables in-circuit reprogramming. Per the Winbond datasheet, the 90 ns access time matches typical 27C010-90 timing, allowing existing board layouts and bus timing to be reused without redesign.
Recommended
POS Terminal Firmware
The W29EE011P-90 is appropriate for point-of-sale (POS) terminal firmware storage because its 128K x 8 organization holds complete transaction-handling code, encryption tables, and font data on a parallel bus accessible in 90 ns. The 5V single-supply requirement matches the 5V rails typical in legacy POS designs. CMOS low standby current extends battery life in portable POS terminals. Byte programming supports remote firmware updates required for PCI compliance and EMV terminal certification.
Recommended
Automotive ECU Code Memory
The W29EE011P-90 is used in legacy automotive ECU code memory applications where 1 Mbit of byte-addressable firmware is required and the system already runs on a 5V rail. The 90 ns access time suits 16-bit automotive microcontrollers without wait states. The 32-PLCC package provides mechanical robustness for engine-bay mounting when socketed. Designers should verify AEC-Q100 qualification status before selecting for new automotive designs; for new programs, prefer AEC-Q100-qualified SPI NOR flash.
Recommended
Vending Machine Controller
The W29EE011P-90 is appropriate for vending machine controller firmware because it provides 128K bytes of code space on a parallel bus matched to legacy Z80 or 8051 vending controllers, and operates from the 5V rail commonly available in vending power supplies. The 90 ns access time allows instruction fetch in a single cycle at typical 8 MHz CPU clocks. Sector erase enables partial firmware updates for changing pricing tables or adding payment options without reprogramming the entire chip.
Recommended
Recommended Products Summary
Engineering reference data for W29EE011P-90 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | W29EE011P-90Z | SST39SF010A-90-4C-PHE | AM29F010B-90PEC |
|---|---|---|---|---|
| Brand | Winbond | Winbond | Microchip Technology | Infineon |
| Package | 32-PLCC | 32-PLCC (same) | 32-PLCC (same) | 32-PLCC (same) |
| Memory Density | 1 Mbit (128K x 8) | 1 Mbit (128K x 8) | 1 Mbit (128K x 8) | 1 Mbit (128K x 8) |
| Access Time | 90 ns | 90 ns | 90 ns | 90 ns |
| Supply Voltage | 5V single supply | 5V single supply | 5V single supply | 5V single supply |
| Lead-Free Finish | Non-Pb-free (standard) | Pb-free (Z suffix) | Pb-free | Pb-free |
| Lifecycle Status | Obsolete | Obsolete | Active | Obsolete (legacy AMD) |
| Sector Erase | Yes | Yes | Yes (4KB sectors) | Yes (sector architecture) |
Key Differentiators
- Single 5V supply eliminates 12V VPP requirement (vs AM27C010 (legacy 1 Mbit UV EPROM))
- Parallel 8-bit bus enables faster code fetch than SPI alternatives (vs W25Q80 SPI flash (1 MByte / 8 Mbit, 4-wire SPI))
- JEDEC 32-PLCC standard pinout enables direct EPROM socket replacement (vs MX29F001T (Macronix 1 Mbit parallel flash))
Design Notes
The 32-PLCC package has a 1.27 mm pin pitch and a JEDEC-standard footprint. Use a PLCC socket (e.g., 32-pin machine-pin socket) for production assemblies that may require field replacement of the flash. For surface-mount assembly directly to the PCB without a socket, follow IPC-7351 land pattern guidelines for PLCC-32 with proper thermal relief on the ground plane. Decoupling: place a 0.1 uF ceramic capacitor within 5 mm of the VCC pin (pin 26), with a 10 uF tantalum or aluminum bulk capacitor near the supply rail entry point to suppress voltage transients during program/erase cycles.
When interfacing the W29EE011P-90 to an 8-bit microcontroller bus, ensure that address and data lines do not exceed 90 ns propagation delay to avoid bus contention between CE# and OE#. Per the Winbond datasheet, address access time (tACC) is 90 ns maximum; OE# access time (tOE) is typically 35-45 ns. Add series termination resistors (22-33 ohm) on long address/data traces (>50 mm) to dampen ringing. Always assert CE# before or simultaneously with OE# to prevent bus contention during read cycles.
Do not exceed VCC of 5.5V absolute maximum - the part is specified for 5V +/- 10% operation only. Do not assert WE# low while CE# is high or while OE# is low, which can cause spurious programming. Ensure the flash command sequence (specific address/data cycles to write to the device) matches the firmware algorithm; the W29EE011P-90 uses Winbond's standard command set, which is similar to but not identical with AMD's AM29F010 command set. Verify command-set compatibility when porting firmware from AMD/Atmel flash parts. The part is obsolete; qualify a second source before committing to production.
Compliance Information
W29EE011P-90 (standard) is non-Pb-free; the lead-free variant is W29EE011P-90Z (Z suffix). RoHS/REACH compliance not explicitly confirmed in verified data; consult Winbond product declaration documents. Not AEC-Q100 qualified.
