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Microchip Technology AT27C040-12TC
- Part No.:
- AT27C040-12TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C040-12TC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,447
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Product details
Overview
AT27C040-12TC 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 120 ns read access time, draws ≤100 µA standby current, and supports commercial temperature range (0°C to 70°C) in a 32-lead TSOP package.
For engineers reviewing the AT27C040-12TC datasheet, AT27C040-12TC pinout, AT27C040-12TC application, or AT27C040-12TC equivalent, key selection criteria include OTP reliability, JEDEC-standard TSOP footprint compatibility, rapid 100 µs/byte programming, CMOS/TTL I/O compatibility, and integrated product identification code for automated programming equipment.
Technical Context
The AT27C040-12TC implements a two-line control architecture using Chip Enable (CE) and Output Enable (OE) to eliminate bus contention in high-speed systems. Its address space spans A0–A18 (19 address lines), supporting full 512K-byte decoding with no external logic required.
Programming uses a Rapid™ algorithm requiring VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with 100 µs CE pulses and verification loops per byte. Product identification is accessed via A9 = 12.0 V ±0.5 V and A0 toggled while all other address lines held low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8) - supports full boot code or firmware image storage without bank switching |
| Read Access Time | 120 ns max - eliminates WAIT states on 8-MHz Z80, 68K, or early x86 systems |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails without regulation |
| Standby Current | ≤100 µA - enables low-power hold mode during processor sleep cycles |
| Active Current | ≤30 mA at 5 MHz - limits thermal load in dense memory arrays |
| ESD Protection | 2000 V HBM - withstands handling in non-ESD-controlled assembly environments |
| Latchup Immunity | 200 mA - prevents destructive latchup during transient overvoltage events |
Pinout & Package
AT27C040-12TC is housed in a 32-lead Plastic Thin Small Outline Package (TSOP), Type I, 8 mm × 20 mm body, JEDEC MO-142 BD compliant, with gull-wing leads and Pin 1 identifier marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; fully decodes 512K locations without external demultiplexing |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; CMOS/TTL-compatible drive strength (IOL = 2.1 mA, IOH = −400 µA) |
| CE | Chip Enable | Active-low chip select; controls device power state and output enable in conjunction with OE |
| OE | Output Enable | Active-low output gate; allows shared bus operation with multiple devices using staggered OE timing |
| VPP | Programming Voltage | 13.0 V ±0.25 V input during programming; must be applied after and removed before VCC per sequencing rules |
| VCC | Power Supply | 5 V ±10% main supply; powers core logic and I/O buffers during read and programming modes |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic bypass capacitor per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-and-reprogram loop ensures field-programmability without manual intervention |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0B) accessible via A9 = 12.0 V and A0 toggle - enables auto-detection by universal programmers |
| Two-Line Control (CE/OE) | Eliminates bus contention in multi-device memory maps by allowing independent gating of chip select and output drivers |
| JEDEC-Standard TSOP Package | 32T footprint ensures drop-in compatibility with legacy PCB layouts designed for 32-lead EPROMs like 27C512 or 27C040 variants |
| High-Reliability CMOS Process | 2000 V ESD rating and 200 mA latchup immunity support robust operation in industrial control and test equipment environments |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic startup sequence and configuration persistence across power cycles. Use Value: 120 ns access time ensures zero-wait-state execution of real-time control routines on 8/16-bit MCUs; OTP security prevents unauthorized firmware modification. | Use Scenario: Hosting immutable BIOS or monitor firmware for vintage 8051, Z80, or 68000-based development systems. IC Role / Device Role / Timing Role: Primary instruction ROM mapped into CPU address space at power-on reset vector location. Use Value: Single 5V supply simplifies power design; CMOS/TTL compatibility guarantees interoperability with diverse bus architectures without level-shifting. |
| Automated Test Equipment (ATE) Pattern Memory | Embedded Instrumentation Calibration Data |
Use Scenario: Storing digital stimulus/response patterns used in semiconductor wafer sort and final test handlers. IC Role / Device Role / Timing Role: High-speed pattern lookup table accessed synchronously with test clock edges. Use Value: 30 mA active current at 5 MHz enables burst-mode pattern streaming without thermal throttling; TSOP package supports high-density board layout. | Use Scenario: Retaining factory-calibrated sensor coefficients and linearity correction tables in portable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Read-only calibration parameter store accessed during instrument initialization and self-test. Use Value: 100 µA max standby current extends battery life in handheld instruments; OTP permanence guarantees calibration integrity over 10+ year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-12DC | Same 4-Mbit (512K × 8) OTP EPROM; 120 ns access, but rated for −40°C to +85°C industrial temp range and packaged in PDIP | Requires PCB layout change due to PDIP vs. TSOP footprint; better suited for through-hole prototyping or high-reliability mil/aero use | Select when industrial temperature range or through-hole assembly is mandatory; not pin-compatible with AT27C040-12TC |
| MX27C4001-12PC | 4-Mbit OTP EPROM with identical 120 ns speed and 5V supply, but uses PLCC package and has different programming voltage (12.5 V) | PLCC socket compatibility enables field reprogramming; different VPP tolerance requires updated programmer settings | Choose for socket-based systems needing field-upgradable firmware; pinout differs significantly from TSOP layout |
Compared with AM27C040-12DC and MX27C4001-12PC, the AT27C040-12TC offers direct surface-mount integration in space-constrained designs, guaranteed commercial-temperature performance, and seamless compatibility with JEDEC TSOP-32 footprints-making it optimal for cost-sensitive, high-volume embedded systems where reprogrammability is not required post-deployment.
Availability
AT27C040-12TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automated test equipment pattern memory requiring stable component supply and long-term obsolescence management.
Supply support for AT27C040-12TC 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 analog products before its acquisition by Microchip Technology in 2016.
The AT27C040 belongs to Atmel's OTP EPROM product line, engineered for reliable, cost-effective firmware and configuration storage in microprocessor-based systems where code immutability and long-term data retention are critical.
FAQ
What is the operating temperature range for the AT27C040-12TC?
The AT27C040-12TC is specified for commercial temperature operation from 0°C to 70°C. This range is validated per the datasheet's DC and AC operating conditions table and applies specifically to the -12TC suffix variant, which denotes the 120 ns speed grade in TSOP packaging. The AT27C040-12TC does not support industrial or extended temperature ranges - those require suffixes ending in 'I' (e.g., AT27C040-12TI).
Does the AT27C040-12TC require a separate programming voltage during normal read operation?
No, the AT27C040-12TC operates from a single 5V ±10% supply during read mode. VPP (13.0 V ±0.25 V) is required only during programming and verification cycles. In read mode, VPP may be tied to VCC, and the device draws ≤30 mA active current and ≤100 µA standby current - both measured with VPP = VCC per datasheet ICC and ISB1 specifications.
How many address lines does the AT27C040-12TC have, and what is their function?
The AT27C040-12TC has 19 address lines: A0 through A18. These inputs decode the full 512K-byte memory space (2¹⁹ = 524,288 addresses). Each unique A0–A18 combination selects one 8-bit data word from the 4-Mbit array. The pinout diagram confirms A0–A18 are dedicated address inputs with no multiplexing or alternate functions in read or programming modes.
Can the AT27C040-12TC be used as a direct replacement for the AT27C040-12PC in an existing design?
No, the AT27C040-12TC cannot serve as a direct replacement for the AT27C040-12PC without PCB modification. While both share identical electrical specifications and speed grade (120 ns), the -12TC uses a 32-lead TSOP package whereas the -12PC uses a 32-lead PDIP. Their footprints, lead pitch (0.5 mm vs. 2.54 mm), and mounting methods are incompatible - requiring layout revision and requalification.
What is the purpose of the Integrated Product Identification Code in the AT27C040-12TC?
The Integrated Product Identification Code in the AT27C040-12TC provides manufacturer (0x1E) and device type (0x0B) identifiers readable via a specific addressing sequence: A9 = 12.0 V ±0.5 V, A0 toggled, and all other address lines held low. This code enables universal programmers to auto-detect the AT27C040-12TC and apply correct programming algorithms and voltage profiles without manual part selection.
AT27C040-12TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT27C040-12TC FAQ
1.How can I place an order for AT27C040-12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-12TC 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 AT27C040-12TC reliable?
The price and inventory of AT27C040-12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-12TC is usually 5 days.
3.What payment methods are accepted for AT27C040-12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-12TC?
AT27C040-12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-12TC 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 AT27C040-12TC?
For technical support, including AT27C040-12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-12TC requirements.
6.How does Aetrix verify that AT27C040-12TC is sourced from the original manufacturer or authorized distributors?
All AT27C040-12TC 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 AT27C040-12TC meets industry standards.
7.What is the process for return or replacement of AT27C040-12TC?
All AT27C040-12TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-12TC, 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 AT27C040-12TC part is unused and in its original packaging.
Return procedure for AT27C040-12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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