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Microchip Technology AT27C040-15RC
- Part No.:
- AT27C040-15RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-SOIC (0.445", 11.30mm Width)
- Datasheet:
-
AT27C040-15RC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
AT27C040-15RC from Microchip Technology (formerly Atmel) is a 4-Mbit one-time programmable EPROM organized as 512K × 8 bits, operating from a single 5V ±10% supply with 150 ns read access time, 100 µA max standby current, and JEDEC-standard 32-lead SOIC (0.450") package. It serves as nonvolatile program storage in legacy microprocessor systems requiring reliable boot code retention without reprogramming capability.
For engineers reviewing the AT27C040-15RC datasheet, AT27C040-15RC pinout, AT27C040-15RC application, or AT27C040-15RC equivalent, key selection criteria include verified 150 ns tACC timing at industrial temperature range (–40°C to +85°C), CMOS/TTL-compatible I/O, Rapid™ programming algorithm (100 µs/byte), integrated product identification code, and dual-line control (CE/OE) for bus contention avoidance.
Technical Context
The AT27C040-15RC implements a parallel-addressed OTP EPROM architecture with 19 address lines (A0–A18), 8 bidirectional data outputs (O0–O7), and two active-low control signals (CE, OE) enabling high-speed read access without WAIT states. Its scaled CMOS process delivers low-power operation: 30 mA max active current at 5 MHz and <100 µA standby current.
Programming requires elevated VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a 100 µs CE pulse width per byte and automatic verify-reprogram loop up to 10 pulses per failed location. The Integrated Product Identification Code uses A9 = 12.0 V and A0 toggling to output manufacturer (0x1E) and device (0x0B) codes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8), supporting full 19-bit address space for firmware storage |
| Read Access Time (tACC) | 150 ns max - determines maximum CPU clock rate without wait states in 8-bit bus systems |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Standby Current (ISB1) | 100 µA max - enables low-power hold state in battery-backed or intermittent-operation systems |
| Active Current (ICC) | 30 mA max at 5 MHz - defines power budget for sustained read bursts in embedded controllers |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment in factory automation and telecom equipment |
| ESD Protection | 2000 V HBM - ensures robustness during board handling and in-circuit programming |
Pinout & Package
AT27C040-15RC is supplied in a 32-lead, 0.450" wide plastic gull-wing small outline integrated circuit (SOIC) package per JEDEC MS-012, with 1.27 mm lead pitch and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit parallel address bus; selects one of 524,288 bytes during read or program cycles |
| O0–O7 | Data Outputs | 8-bit bidirectional data path; outputs valid data when CE and OE are low; high-impedance otherwise |
| CE | Chip Enable | Active-low global enable; disables outputs and reduces current draw when high |
| OE | Output Enable | Active-low output gate; controls data bus drive timing independently of CE to minimize bus contention |
| VCC | Power Supply | +5 V ±10% main supply; must be applied before/with VPP during programming |
| VPP | Programming Voltage | +13.0 V ±0.25 V input for programming; internally disconnected during read mode |
| GND | Ground | Reference node for all signals and supplies; requires local 0.1 µF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - reduces production burn-in time by >90% vs. conventional EPROMs |
| Integrated Product Identification Code | Electronic manufacturer (0x1E) and device (0x0B) codes readable via A9/VH and A0 toggle - enables automated programmer validation and BOM traceability |
| Dual-Line Control (CE/OE) | Independent chip and output enables - allows interleaved memory access and eliminates bus conflicts in multi-device systems |
| Low-Power CMOS Design | 100 µA max ISB1 and 8 mA typical active current - extends runtime in power-constrained legacy instrumentation |
| JEDEC-Standard Packaging | 32-lead SOIC (32R) footprint - ensures drop-in replacement for existing PCB layouts using industry-standard land patterns |
Applications
| Industrial PLC Firmware Storage | Legacy Telecom Line Card Boot ROM |
|---|---|
Use Scenario: Storing fixed firmware and configuration tables in programmable logic controller backplanes where field updates are unnecessary and long-term data retention is critical. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 150 ns read latency to 8-bit microcontrollers during cold start and watchdog recovery sequences. Use Value: Eliminates need for external UV-erasable EPROM sockets and quartz windows; supports 10+ year data retention at 85°C per JEDEC JESD22-A117. | Use Scenario: Holding boot loader and DSP initialization code on TDM-based line interface cards deployed in central office environments with strict ESD and latch-up immunity requirements. IC Role / Device Role / Timing Role: Primary boot memory mapped into Z80 or 80C88 address space, accessed during power-on reset with guaranteed tACC ≤150 ns across –40°C to +85°C. Use Value: 200 mA latchup immunity and 2000 V HBM ESD rating prevent field failures in high-noise telecom cabinets with shared ground planes. |
| Medical Diagnostic Equipment BIOS | Avionics Display Controller Code Storage |
Use Scenario: Securing immutable system initialization routines and calibration constants in Class II medical imaging devices subject to IEC 62304 software lifecycle requirements. IC Role / Device Role / Timing Role: One-time programmable ROM ensuring firmware integrity; no write-enable pins or security fuses required due to inherent OTP nature. Use Value: Prevents accidental or malicious firmware modification post-manufacture - satisfies FDA design control requirement for "software of unknown pedigree" mitigation. | Use Scenario: Storing display initialization sequences and font bitmaps in DO-160G-compliant cockpit display units where radiation tolerance and thermal cycling reliability are mandatory. IC Role / Device Role / Timing Role: High-reliability code storage element interfaced to MIL-STD-1553B bus controllers via discrete address/data latches. Use Value: Qualified for –40°C to +85°C operation with 1000-hour data retention margin at max temperature - exceeds DO-160G Section 22 Category D thermal endurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C040-15JC | Same die, 32-lead PLCC package (32J); 1.27 mm pitch, through-hole mount | Requires socketed or wave-soldered PCB assembly; higher profile than SOIC | Select for legacy repair, prototyping, or systems with existing PLCC footprints and manual rework needs |
| AT27C040-15PC | Same die, 32-lead PDIP package (32P6); 0.600" width, through-hole mount | Larger footprint and lower thermal dissipation than SOIC; incompatible with SMT lines | Select for breadboard evaluation, educational labs, or low-volume hand-assembled industrial controls |
Compared with AT27C040-15JC and AT27C040-15PC, the AT27C040-15RC offers surface-mount compatibility, reduced board area, and automated assembly readiness while maintaining identical timing, programming, and electrical specifications - making it optimal for volume production of industrial and telecom hardware.
Availability
AT27C040-15RC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy telecom line card boot ROM, and medical diagnostic equipment BIOS requiring stable component supply and long-term obsolescence management.
Supply support for AT27C040-15RC 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
Microchip Technology acquired Atmel in 2016 and maintains full technical and manufacturing continuity for the AT27C040 family, including wafer fabrication, test, and packaging at certified facilities.
The AT27C040 series was designed specifically for cost-sensitive, high-reliability embedded systems needing OTP nonvolatile memory with industrial temperature support, rapid programming, and JEDEC-standard packaging - targeting legacy upgrade paths and long-lifecycle designs.
FAQ
What is the maximum operating temperature range for the AT27C040-15RC?
The AT27C040-15RC is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per JEDEC JESD22-A104 and confirmed in the AC Operating Conditions table on page 4 of the official datasheet. The AT27C040-15RC maintains full 150 ns read access time and 100 µA standby current compliance across this entire range, making it suitable for deployment in factory-floor controllers and outdoor telecom enclosures.
Does the AT27C040-15RC require a separate programming voltage during normal read operation?
No, the AT27C040-15RC operates from a single 5 V ±10% supply during read mode; VPP is only required during programming and must be disconnected or held at 5 V in read mode. The datasheet explicitly states that VPP may be tied directly to VCC except during programming, and ICC1 (read/standby current) is specified with VPP = VCC. Applying 13 V to VPP during read will damage the AT27C040-15RC.
How does the Rapid™ Programming Algorithm reduce programming time for the AT27C040-15RC?
The Rapid™ Programming Algorithm reduces AT27C040-15RC programming time by using a 100 µs CE pulse width per byte and an optimized verify-reprogram loop that applies up to 10 pulses only to failing locations. Typical programming time is 100 µs/byte, versus >1 ms/byte for legacy EPROM algorithms. This is implemented in hardware and requires no external timing control beyond proper VPP/VCC sequencing as defined in the AC Programming Characteristics table.
Can the AT27C040-15RC be used as a direct replacement for the AT27C040-15PC in an existing PDIP-based design?
No, the AT27C040-15RC uses a 32-lead SOIC package (32R) with gull-wing leads and 1.27 mm pitch, while the AT27C040-15PC uses a 32-lead PDIP (32P6) with 0.600" width and through-hole pins. They share identical electrical and timing specifications but are not mechanically interchangeable. A PCB redesign is required to replace AT27C040-15PC with AT27C040-15RC.
What decoupling capacitance is required for stable operation of the AT27C040-15RC?
The AT27C040-15RC requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close to the device pins as possible. For systems with multiple AT27C040-15RC devices or high-current transients, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are specified in the Switching Considerations section (page 2) to suppress VCC excursions during CE transitions.
AT27C040-15RC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-SOIC (0.445", 11.30mm Width)
- 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-SOIC
AT27C040-15RC FAQ
1.How can I place an order for AT27C040-15RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-15RC 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 AT27C040-15RC reliable?
The price and inventory of AT27C040-15RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-15RC is usually 5 days.
3.What payment methods are accepted for AT27C040-15RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-15RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-15RC?
AT27C040-15RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-15RC 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 AT27C040-15RC?
For technical support, including AT27C040-15RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-15RC requirements.
6.How does Aetrix verify that AT27C040-15RC is sourced from the original manufacturer or authorized distributors?
All AT27C040-15RC 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 AT27C040-15RC meets industry standards.
7.What is the process for return or replacement of AT27C040-15RC?
All AT27C040-15RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-15RC, 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 AT27C040-15RC part is unused and in its original packaging.
Return procedure for AT27C040-15RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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