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Microchip Technology AT27C040-70JC
- Part No.:
- AT27C040-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C040-70JC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,804
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Product details
Overview
AT27C040-70JC from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM with 70 ns read access time, 5V ±10% supply operation, and JEDEC-standard 32-lead PLCC packaging. It delivers low-power CMOS performance (100 µA max standby, 30 mA max active at 5 MHz) and supports high-speed microprocessor systems without WAIT states.
For engineers reviewing the AT27C040-70JC datasheet, AT27C040-70JC pinout, AT27C040-70JC application, or AT27C040-70JC equivalent, key selection factors include its Rapid™ programming algorithm (100 µs/byte), integrated product identification code, dual-line control (CE/OE), 2000V ESD protection, and industrial temperature range support (-40°C to +85°C).
Technical Context
The AT27C040-70JC implements a CMOS-based OTP EPROM architecture with address decoding for A0–A18 (19-bit addressing), 8-bit parallel data outputs (O0–O7), and two independent enable controls (CE and OE) to prevent bus contention. Its internal logic supports fast read cycles and rapid byte-level programming using VPP = 13.0V during write operations.
It features an integrated product identification mechanism where A9 is driven to 12.0V ±0.5V and A0 toggled to select manufacturer (0x1E) or device code (0x0B), enabling automatic algorithm selection in industry-standard programmers. The device requires decoupling capacitors (0.1 µF ceramic + 4.7 µF bulk) for stable VCC/VPP switching.
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 | 70 ns maximum - enables direct interface with 14 MHz+ microprocessors without wait states |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails and legacy embedded power domains |
| Standby Current | 100 µA max - ensures ultra-low quiescent power in battery-backed or always-on systems |
| Active Current | 30 mA max at 5 MHz - supports sustained read throughput in real-time control applications |
| Programming Voltage | VPP = 13.0V ±0.25V - requires dedicated programming hardware; not used in normal read operation |
| ESD Protection | 2000V HBM - meets industrial handling requirements without additional external protection |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage or ground bounce conditions |
Pinout & Package
AT27C040-70JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 variation AE compliant, with 1.27 mm pitch, 12.4 mm × 14.9 mm body, and pin 1 identifier notch. Pinout is identical across PLCC, PDIP, and TSOP variants per datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus inputs; fully decoded internally to select one of 524,288 bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low global chip select; must be asserted before OE to initiate valid read cycle |
| OE | Output Enable | Active-low output gate; allows multiple devices on same data bus with shared CE |
| VPP | Programming Voltage | 13.0V input during programming only; tied to VCC (5V) during read operation |
| VCC | Power Supply | 5V ±10% main supply; powers core logic and I/O buffers in both read and program modes |
| GND | Ground Reference | Primary signal and power return; requires low-inductance connection to decoupling capacitors |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - reduces production programming cycle time by >5× vs conventional EPROMs |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0B) readable via A9/VH and A0 toggle - eliminates manual programmer setup errors |
| Two-Line Control Architecture | Separate CE and OE pins - enables flexible memory mapping and eliminates bus contention in multi-device systems |
| JEDEC-Standard Packaging | 32J PLCC footprint - ensures drop-in compatibility with existing sockets and PCB layouts designed for industry-standard EPROMs |
| High-Reliability Process | 2000V ESD rating and 200 mA latchup immunity - suitable for industrial environments with noisy power and grounding |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot ROM |
|---|---|
Use Scenario: Storing fixed firmware for programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Non-volatile boot ROM providing deterministic 70 ns instruction fetch timing to microcontrollers during cold start and runtime execution. Use Value: Eliminates need for external WAIT-state generators; 100 µA standby current extends uptime in battery-buffered backup scenarios. | Use Scenario: Holding calibration tables and base engine control logic in pre-OBD-II automotive ECUs where field reprogramming is not required. IC Role / Device Role / Timing Role: OTP memory mapped into CPU address space as primary code storage, accessed via standard 8-bit data bus and 19-bit address lines. Use Value: Industrial temperature range (-40°C to +85°C) and 200 mA latchup immunity ensure reliability under under-hood thermal cycling and load-dump transients. |
| Military Communications Equipment | Medical Diagnostic Instrument Bootloader |
Use Scenario: Secure storage of immutable communication protocol stacks and cryptographic keys in tactical radios where tamper resistance is critical. IC Role / Device Role / Timing Role: One-time programmable ROM preventing post-deployment firmware modification; accessed via microcontroller's external memory interface. Use Value: Rapid™ programming enables secure, high-throughput provisioning in trusted manufacturing environments prior to field deployment. | Use Scenario: Hosting bootloader firmware for FDA-cleared diagnostic imaging systems requiring long-term validation stability and zero-field updates. IC Role / Device Role / Timing Role: Fixed-function boot ROM initializing FPGA configuration and sensor interface controllers before loading application software from flash. Use Value: 5V ±10% supply tolerance accommodates aging power supplies; 2000V ESD protection safeguards against operator-handling events during service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-70DC | Same 4-Mbit (512K × 8) OTP EPROM, 70 ns access, but uses AMD's process; higher standby current (200 µA max) and no integrated ID code | Lacks product identification feature - requires manual programmer configuration; less suited for automated high-volume programming lines | Select AM27C040-70DC only if legacy AMD tooling is in place and ID-code automation is unnecessary |
| MX27C4001-70PC | Macronix 4-Mbit OTP EPROM with identical 70 ns speed and 5V supply, but rated for commercial temp only (0°C to 70°C); no VPP-based ID code support | Not qualified for industrial temperature range - unsuitable for under-hood, factory-floor, or outdoor deployments | Choose MX27C4001-70PC only for cost-sensitive commercial equipment with controlled ambient conditions |
Compared with AM27C040-70DC and MX27C4001-70PC, the AT27C040-70JC uniquely combines industrial temperature support, integrated product identification, and lower standby current - making it the preferred choice for automated programming, harsh-environment deployments, and long-lifecycle embedded systems.
Availability
AT27C040-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot ROM, military communications equipment, medical diagnostic instrument bootloaders, and other applications requiring stable component supply with guaranteed long-term availability.
Supply support for AT27C040-70JC 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 designer specializing in microcontrollers, non-volatile memory, and RF solutions before its acquisition by Microchip Technology in 2016.
The AT27C040-70JC belongs to Atmel's OTP EPROM product line, engineered for reliable, low-power, high-speed firmware storage in industrial, automotive, and defense systems where field reprogrammability is not required.
FAQ
What is the operating temperature range for the AT27C040-70JC?
The AT27C040-70JC is specified for industrial temperature operation from -40°C to +85°C. This range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. Unlike commercial-grade variants (e.g., AT27C040-70PC), the 'I' suffix in the ordering code denotes industrial qualification, making the AT27C040-70JC suitable for under-hood automotive, factory automation, and outdoor equipment applications where thermal stability is critical.
Does the AT27C040-70JC require a programming voltage during normal read operation?
No, the AT27C040-70JC does not require VPP during normal read operation. VPP (13.0V ±0.25V) is applied only during programming and verification cycles. In read mode, VPP is tied to VCC (5V), as explicitly stated in the DC Programming Characteristics note and AC Waveforms section. The AT27C040-70JC functions as a standard 5V-only memory device during system operation, simplifying power design and eliminating need for dual-rail supplies.
How does the Rapid™ Programming Algorithm improve production efficiency for the AT27C040-70JC?
The Rapid™ Programming Algorithm reduces AT27C040-70JC programming time to ~100 µs per byte with built-in verify-and-reprogram loops. This cuts total 4-Mbit programming time to under 400 seconds versus >2000 seconds for legacy EPROM algorithms. The AT27C040-70JC also includes an integrated product identification code that auto-configures programmers - eliminating manual setup errors and reducing operator training time in high-volume manufacturing lines.
Can the AT27C040-70JC be used as a direct replacement for the AT27C040-70PC?
Yes, the AT27C040-70JC is pin-compatible and functionally identical to the AT27C040-70PC, differing only in package (PLCC vs PDIP) and temperature grade (industrial vs commercial). Both share identical AC/DC specifications, pinout, and programming characteristics. The AT27C040-70JC replaces the AT27C040-70PC in applications requiring extended temperature operation or surface-mount assembly, with no PCB layout changes needed beyond socket or footprint adaptation.
What decoupling capacitance is required for stable operation of the AT27C040-70JC?
The AT27C040-70JC requires two decoupling capacitors: a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close to the device as possible, plus a 4.7 µF bulk electrolytic capacitor located near the power entry point of the board. This dual-capacitor strategy suppresses both high-frequency transients (from CE/OE switching) and low-frequency droop (during array-wide reads), ensuring compliance with the 5V ±10% supply specification and preventing non-conformance due to voltage excursions.
AT27C040-70JC 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:
- 70 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)
AT27C040-70JC FAQ
1.How can I place an order for AT27C040-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-70JC 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 AT27C040-70JC reliable?
The price and inventory of AT27C040-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-70JC is usually 5 days.
3.What payment methods are accepted for AT27C040-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-70JC?
AT27C040-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-70JC 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 AT27C040-70JC?
For technical support, including AT27C040-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-70JC requirements.
6.How does Aetrix verify that AT27C040-70JC is sourced from the original manufacturer or authorized distributors?
All AT27C040-70JC 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 AT27C040-70JC meets industry standards.
7.What is the process for return or replacement of AT27C040-70JC?
All AT27C040-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-70JC, 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 AT27C040-70JC part is unused and in its original packaging.
Return procedure for AT27C040-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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