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Microchip Technology AT27C040-15JC
- Part No.:
- AT27C040-15JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C040-15JC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,944
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Product details
Overview
AT27C040-15JC 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 read access time, draws ≤100 µA standby current, and supports commercial temperature range (0°C to 70°C). Its PLCC-32 package enables direct socket replacement in legacy embedded controllers and industrial firmware modules.
For engineers reviewing the AT27C040-15JC datasheet, AT27C040-15JC pinout, AT27C040-15JC application, or AT27C040-15JC equivalent, this page provides verified timing parameters, JEDEC-standard PLCC pin mapping, Rapid™ programming behavior, CMOS/TTL I/O compatibility, and real-world use cases in firmware boot memory and configuration storage where OTP reliability and 5V simplicity are critical.
Technical Context
The AT27C040-15JC implements a two-line control architecture using CE (Chip Enable) and OE (Output Enable) to eliminate bus contention during high-speed read cycles. Its address decoding covers A0–A18 (19-bit), supporting full 512K-byte addressing without external latching.
It uses Atmel's scaled CMOS process with 2000V ESD protection and 200 mA latchup immunity. Programming requires VPP = 13.0V ±0.25V and VCC = 6.5V ±0.25V, with a 100 µs CE pulse width per byte under the Rapid™ algorithm - verified across all bytes before final verification pass.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8); supports full 8-bit data bus interface without multiplexing |
| Read Access Time | 150 ns max (tACC); eliminates WAIT states in 80C186/80C188 and similar 5 MHz microcontrollers |
| Supply Voltage | 5V ±10%; compatible with standard TTL/CMOS logic rails and legacy power supplies |
| Standby Current | ≤100 µA (ISB1, CMOS CE input); enables low-power hold mode in battery-backed systems |
| Active Current | ≤30 mA at 5 MHz (ICC); supports sustained burst reads without thermal derating |
| Programming Voltage | VPP = 13.0V ±0.25V; requires dedicated programming hardware with controlled ramp and decoupling |
| Operating Temperature | 0°C to 70°C (Commercial); validated for office, lab, and non-extended industrial environments |
Pinout & Package
AT27C040-15JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), JEDEC MS-016 compliant, with pin 1 marked by corner notch and lead coplanarity ≤0.102 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus; fully decoded internally - no external address latches required |
| O0–O7 | Data Outputs | True TTL/CMOS-compatible 8-bit bidirectional data bus (output only in read mode) |
| CE | Chip Enable | Active-low global enable; controls device power state and output driver activation |
| OE | Output Enable | Active-low output gate; allows shared bus operation with other peripherals via timing-controlled gating |
| VPP | Programming Voltage | 13.0V input during programming only; must be ramped after VCC and removed before VCC |
| VCC | Power Supply | 5V ±10% main supply; powers logic and output drivers during read; elevated to 6.5V during programming |
| GND | Ground Reference | Common return path for VCC, VPP, and I/O; requires local 0.1 µF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-reprogram loop up to 10 pulses per failed byte |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0B) readable via A9=12V and A0 toggle - enables auto-detection in universal programmers |
| Two-Line Control (CE/OE) | Eliminates bus contention in multi-peripheral systems; supports clean read timing without external wait-state logic |
| CMOS/TTL I/O Compatibility | Meets both CMOS input thresholds (VIH ≥2.0V) and TTL output drive specs (IOL=2.1mA, VOH≥2.4V) - interoperable with mixed-logic designs |
| High-Reliability Process | 2000V HBM ESD rating and 200 mA latchup immunity - suitable for rework-prone manufacturing and field service environments |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic firmware in modular PLC backplanes where field updates are rare but long-term data retention is mandatory. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU address space; accessed during cold start and watchdog reset recovery. Use Value: 150 ns tACC ensures zero-wait-state execution of initialization code on 5 MHz Z80 or 80C88-based controllers. |
Use Scenario: Holding POST and boot strap code in early x86 motherboards prior to flash adoption, requiring socket-based field replacement. IC Role / Device Role / Timing Role: Primary BIOS ROM directly interfaced to ISA bus; CE tied to address decoder, OE gated by IORC#. Use Value: PLCC-32 footprint and 5V-only read operation allow drop-in replacement of obsolete 27C256/27C512 variants without board redesign. |
| Medical Instrument Configuration Memory | Test Equipment Calibration Data Storage |
Use Scenario: Retaining factory-calibrated sensor offsets and safety-critical operational limits in Class II medical devices with 10+ year shelf life requirements. IC Role / Device Role / Timing Role: OTP configuration store read once at power-up; isolated from runtime writes to prevent corruption. Use Value: 2000V ESD protection and 100 µA ISB ensure integrity during handling, transport, and periodic recalibration procedures. |
Use Scenario: Archiving instrument-specific calibration coefficients and linearity correction tables in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Read-only data repository accessed via microcontroller SPI-to-parallel bridge during self-test sequence. Use Value: Integrated product ID (0x1E/0x0B) allows automated verification of correct EPROM revision during calibration upload and audit logging. |
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 | Same 4-Mbit size and 150 ns speed, but uses AMD's CMOS process; higher 250 µA ISB and no integrated ID code | Lacks A9-based manufacturer/device ID; requires manual programmer setup instead of auto-detection | Acceptable where board layout matches PLCC-32 and system does not rely on ID-based programming validation |
| MX27C4001-15PC | 4-Mbit OTP EPROM with identical 150 ns tACC and 5V supply, but rated for -40°C to +85°C industrial temp range | Broader temperature support enables use in outdoor test gear or factory-floor controllers where ambient exceeds 70°C | Preferred when extended temperature operation is required; otherwise functionally interchangeable in commercial-range systems |
Compared with AM27C040-15DC, AT27C040-15JC offers lower standby current and built-in ID code for reliable programming; versus MX27C4001-15PC, it trades industrial temp range for tighter commercial-spec leakage and lower cost in temperature-controlled environments.
Availability
AT27C040-15JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS boot ROM, and medical instrument configuration memory requiring stable component supply and long-lifecycle support.
Supply support for AT27C040-15JC 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 company specializing in microcontrollers, nonvolatile memory, and RF solutions before its acquisition by Microchip Technology in 2016.
The AT27C040-15JC belongs to Atmel's OTP EPROM product line, engineered for cost-sensitive, high-reliability firmware storage in systems where field reprogrammability is unnecessary and data permanence is critical.
FAQ
What is the maximum read access time specified for the AT27C040-15JC?
The AT27C040-15JC has a maximum read access time (tACC) of 150 ns under standard conditions (VCC = 5V ±10%, TA = 25°C). This value is guaranteed across the full commercial temperature range (0°C to 70°C) and applies to all valid address-to-data transitions when CE and OE are both asserted low. The "-15" suffix in AT27C040-15JC explicitly denotes this 150 ns speed grade.
Does the AT27C040-15JC require a programming voltage during normal read operation?
No, the AT27C040-15JC operates on a single 5V supply during normal read mode. VPP (13.0V) is required only during programming and verification cycles. In read mode, VPP may be tied to VCC or left unconnected depending on system design, but must never exceed 7.0V. The AT27C040-15JC datasheet specifies that VPP is inactive and irrelevant to read functionality.
Can the AT27C040-15JC be used as a direct replacement for the AT27C040-12JC?
Yes, the AT27C040-15JC is pin- and function-compatible with the AT27C040-12JC, differing only in maximum access time (150 ns vs. 120 ns) and corresponding AC timing parameters. Both share identical DC characteristics, pinout, package (PLCC-32), and programming requirements. Systems designed for the slower AT27C040-12JC will operate reliably with the AT27C040-15JC, though timing margins increase slightly.
What is the purpose of the Integrated Product Identification Code in the AT27C040-15JC?
The Integrated Product Identification Code in the AT27C040-15JC provides two electronically readable bytes: Manufacturer ID (0x1E) and Device Code (0x0B). Accessed by applying 12.0V ±0.5V to A9 while toggling A0, it enables universal programmers to auto-detect the part and select correct algorithms and voltages - eliminating manual setup errors during production programming of AT27C040-15JC devices.
Is the AT27C040-15JC RoHS-compliant?
The AT27C040-15JC was manufactured prior to RoHS enforcement deadlines and is not RoHS-compliant. It contains lead in the PLCC-32 package leads and solder finish. For new designs requiring RoHS compliance, consider modern flash alternatives or verify legacy exemption eligibility with your compliance officer - the AT27C040-15JC remains available for repair and legacy sustainment where exemptions apply.
AT27C040-15JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C040-15JC FAQ
1.How can I place an order for AT27C040-15JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-15JC 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 AT27C040-15JC reliable?
The price and inventory of AT27C040-15JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-15JC is usually 5 days.
3.What payment methods are accepted for AT27C040-15JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-15JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-15JC?
AT27C040-15JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-15JC 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 AT27C040-15JC?
For technical support, including AT27C040-15JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-15JC requirements.
6.How does Aetrix verify that AT27C040-15JC is sourced from the original manufacturer or authorized distributors?
All AT27C040-15JC 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 AT27C040-15JC meets industry standards.
7.What is the process for return or replacement of AT27C040-15JC?
All AT27C040-15JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-15JC, 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 AT27C040-15JC part is unused and in its original packaging.
Return procedure for AT27C040-15JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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