My Inquiry
My Account
Microchip Technology AT27C040-15PI
- Part No.:
- AT27C040-15PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C040-15PI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,740
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C040-15PI from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM designed for nonvolatile program storage in microprocessor systems. It operates on a single 5V ±10% supply, delivers 150 ns maximum access time, supports industrial temperature range (–40°C to +85°C), and uses CMOS/TTL-compatible I/O with dual-line control (CE/OE). It is commonly deployed in firmware boot memory for legacy industrial controllers.
For engineers reviewing the AT27C040-15PI datasheet, AT27C040-15PI pinout, AT27C040-15PI application, or AT27C040-15PI equivalent, key selection criteria include verified 150 ns read timing, industrial-grade standby current ≤100 µA, PDIP-32 package compatibility, and Rapid™ programming support at 100 µs/byte.
Technical Context
The AT27C040-15PI implements a standard OTP EPROM architecture with 19 address lines (A0–A18) and 8 bidirectional data outputs (O0–O7), controlled by Chip Enable (CE) and Output Enable (OE) inputs. Its two-line control scheme eliminates bus contention during high-speed read cycles.
It features integrated product identification (Manufacturer ID = 0x1E, Device ID = 0x0B) accessed via A9 = 12.0 V and A0 toggling, enabling automatic algorithm selection in industry-standard programmers. Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with CE pulse width tightly controlled at 100 µs ±5%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304-bit (512K × 8) - supports full 19-bit addressing for boot code up to 512 KB |
| Access Time | 150 ns max - ensures compatibility with 6–7 MHz microprocessor buses without WAIT states |
| Supply Voltage | 5V ±10% - single-rail operation simplifies power design vs. multi-voltage EPROMs |
| Standby Current | ≤100 µA (CMOS CE) - enables low-power retention in always-on industrial modules |
| Active Current | ≤30 mA at 5 MHz - compatible with standard 5V logic rail current budgets |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time vs. older EPROMs |
| ESD Protection | 2000V HBM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
AT27C040-15PI is packaged in a 32-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC standard 32P6, with 0.100" lead pitch and through-hole mounting. Pin 1 is marked by a notch or dot at the top-left corner of the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; A0 = LSB, A18 = MSB; all must be stable before CE/OE assertion |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; high-impedance when CE or OE is high |
| CE | Chip Enable | Primary device select; low enables memory access; controls active/standby current transition |
| OE | Output Enable | Secondary output gate; low enables O0–O7 drivers; allows CE-controlled standby while preserving bus drive |
| VPP | Programming Voltage | 12.0 V ±0.5 V input during programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | +5V ±10% main supply; powers logic and output buffers; requires local 0.1 µF ceramic decoupling |
| GND | Ground | Signal and power reference; requires low-inductance connection to minimize noise during rapid programming |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - cuts production burn-in time by >5× vs. conventional EPROMs |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device ID (0x0B) readable via A9/VH and A0 toggle - enables zero-configuration programmer recognition |
| Two-Line Control (CE/OE) | Independent chip and output gating - prevents bus contention during partial decode or multiplexed address/data systems |
| Industrial Temperature Range | –40°C to +85°C operation - qualified for deployment in motor drives, PLCs, and outdoor instrumentation |
| CMOS/TTL Compatibility | VIL ≤0.8 V, VIH ≥2.0 V, VOL ≤0.4 V, VOH ≥2.4 V - interoperable with both legacy TTL and modern CMOS microcontrollers |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Nonvolatile storage of ladder logic firmware in DIN-rail mounted programmable logic controllers operating in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary boot memory mapped to reset vector; accessed during cold start and watchdog recovery sequences. Use Value: 150 ns access time ensures deterministic boot within 20 µs of reset release; industrial temp rating guarantees reliability across seasonal HVAC variations. |
Use Scenario: Fixed-function embedded systems using 8051 or Z80 derivatives where firmware is immutable post-deployment and requires long-term data retention (>10 years). IC Role / Device Role / Timing Role: Read-only instruction memory executing directly from address space; no write cycles during runtime. Use Value: Single 5V supply eliminates need for charge-pump or external VPP generation; 100 µA standby current extends battery-backed operation in maintenance mode. |
| Automated Test Equipment (ATE) Configuration | Medical Device Calibration Data |
Use Scenario: Storing calibration constants and test sequence definitions in rack-mounted ATE platforms used in semiconductor final test. IC Role / Device Role / Timing Role: Static configuration memory read once per test session; accessed via parallel bus under microcontroller control. Use Value: JEDEC-standard PDIP-32 footprint allows direct replacement of obsolete EPROMs; 2000V ESD rating withstands lab handling without special precautions. |
Use Scenario: Permanent storage of sensor offset/gain coefficients and safety-critical operational limits in Class II medical instruments requiring regulatory traceability. IC Role / Device Role / Timing Role: Immutable data repository accessed during power-up self-test and periodic verification routines. Use Value: OTP architecture prevents accidental or malicious firmware modification; product ID code enables automated BOM audit during manufacturing QA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-15DC | 150 ns access, same 512K×8 density, but requires VPP = 12.5 V and has higher standby current (200 µA max) | Compatible in read mode; not recommended for low-power industrial systems due to higher ISB | Select only if existing AMI-based programming infrastructure is in place and 100 µA standby is not required. |
| MX27C4001-15PC | Same 150 ns speed and PDIP-32 package, but lacks integrated product ID and uses different programming voltage sequencing (VPP before VCC) | Requires modified programmer firmware; unsuitable for automated ID-based algorithm selection | Prefer only when cost is primary constraint and manual programming setup is acceptable. |
Compared with AM27C040-15DC and MX27C4001-15PC, the AT27C040-15PI offers tighter standby current control (100 µA vs. 200 µA/150 µA), guaranteed Rapid™ programming compatibility, and standardized JEDEC product ID coding-making it the preferred choice for new industrial designs requiring field-programmable reliability and automated production flow.
Availability
AT27C040-15PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automated test equipment configuration requiring stable component supply over extended production lifecycles.
Supply support for AT27C040-15PI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation was a U.S.-based semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and RF solutions before its acquisition by Microchip Technology in 2016.
The AT27C040-15PI belongs to Atmel's OTP EPROM product line, engineered for reliable, low-cost, long-life firmware storage in industrial and automotive control systems where reprogrammability is unnecessary but data integrity is critical.
FAQ
What is the maximum operating temperature range for the AT27C040-15PI?
The AT27C040-15PI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet. The device undergoes temperature cycling validation per JEDEC standards to ensure functionality and data retention across this full range. AT27C040-15PI maintains 150 ns access time and ≤100 µA standby current throughout this interval.
Does the AT27C040-15PI require a separate programming voltage supply?
Yes, the AT27C040-15PI requires VPP = 13.0 V ±0.25 V during programming, applied to the VPP pin. This voltage must be sequenced after VCC is stable and removed before VCC is powered down. During normal read operation, only +5V is needed. The AT27C040-15PI does not support in-system programming and must be programmed in a dedicated EPROM programmer with compliant voltage and timing control.
Is the AT27C040-15PI pin-compatible with other 32-pin EPROMs like the 27C4001?
No, the AT27C040-15PI is not pin-compatible with the 27C4001. Although both use 32-pin PDIP packages, the AT27C040-15PI assigns VPP to pin 1, whereas the 27C4001 uses pin 1 for A12. Pinout differences extend to address line mapping (e.g., A16/A15 placement) and control signal routing. Direct substitution would cause functional failure or damage due to incorrect VPP application.
How is the product identification code accessed on the AT27C040-15PI?
The AT27C040-15PI product identification code is accessed by asserting A9 = 12.0 V ±0.5 V (VID), holding A1–A18 = VIL, and toggling A0 between VIL and VIH. When A0 = VIL, the Manufacturer ID (0x1E) appears on O7–O0; when A0 = VIH, the Device ID (0x0B) appears. This mode requires VPP = 12.0 V and is supported only in dedicated programming equipment that implements the correct voltage sequencing.
What decoupling capacitance is required for stable operation of the AT27C040-15PI?
The AT27C040-15PI requires a minimum 0.1 µF high-frequency ceramic capacitor connected between VCC and GND, placed as close as possible to the device pins. For systems with multiple EPROMs or high-noise environments, a bulk 4.7 µF electrolytic capacitor should also be added near the power entry point. These values are specified in the Switching Considerations section to suppress transients caused by CE-driven state transitions.
AT27C040-15PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT27C040-15PI FAQ
1.How can I place an order for AT27C040-15PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-15PI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT27C040-15PI reliable?
The price and inventory of AT27C040-15PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-15PI is usually 5 days.
3.What payment methods are accepted for AT27C040-15PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-15PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-15PI?
AT27C040-15PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-15PI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT27C040-15PI?
For technical support, including AT27C040-15PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-15PI requirements.
6.How does Aetrix verify that AT27C040-15PI is sourced from the original manufacturer or authorized distributors?
All AT27C040-15PI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT27C040-15PI meets industry standards.
7.What is the process for return or replacement of AT27C040-15PI?
All AT27C040-15PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-15PI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT27C040-15PI part is unused and in its original packaging.
Return procedure for AT27C040-15PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C040-15PI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
