My Inquiry
My Account
Microchip Technology AT27LV256A-12JI
- Part No.:
- AT27LV256A-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV256A-12JI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,047
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27LV256A-12JI from Atmel is a 262,144-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 120 ns read access time at 3.0–3.6 V or 4.5–5.5 V, 20 µA max standby current, and JEDEC-standard 32-lead PLCC packaging. It supports dual-supply interoperability with TTL/CMOS logic and integrates Rapid™ programming (100 µs/byte typical).
For engineers reviewing the AT27LV256A-12JI datasheet, AT27LV256A-12JI pinout, AT27LV256A-12JI application, or AT27LV256A-12JI equivalent, key selection criteria include its industrial temperature range (−40°C to +85°C), VPP-dependent programming mode, two-line control architecture (CE/OE), and compatibility with legacy AT27C256R-based designs.
Technical Context
The AT27LV256A-12JI implements a standard OTP EPROM architecture with address decoding for A0–A14, eight bidirectional data outputs (O0–O7), and dual enable controls: Chip Enable (CE) and Output Enable (OE). Its operation requires VPP = 13.0 V during programming but only VCC = 3.0–3.6 V (or 4.5–5.5 V) for read mode.
It uses high-reliability CMOS technology with 2,000 V ESD protection and 200 mA latchup immunity. The integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x8C) enables automatic algorithm selection in industry-standard programmers, and it shares identical programming behavior with AT27C256R.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 bits (32K × 8) - supports firmware storage for microcontroller boot code or configuration tables. |
| Read Access Time | 120 ns max at VCC = 3.0–3.6 V - meets timing requirements for 8-bit bus interfaces running ≤8.3 MHz. |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - enables direct integration into mixed-voltage systems without level shifters. |
| Standby Current | 20 µA max at VCC = 3.6 V - reduces quiescent power in always-on embedded modules. |
| Programming Voltage | VPP = 13.0 ± 0.25 V - requires dedicated programming supply; not compatible with standard 5 V-only programmers. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade applications including motor control and instrumentation. |
| Package | 32-lead PLCC (32J) - surface-mount compatible with JEDEC MS-016 AE footprint and reflow profiles. |
Pinout & Package
AT27LV256A-12JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE. Pins 1 and 17 are no-connect (NC) and must remain unconnected on PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus interface; latched on CE falling edge for memory location selection. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; high-impedance when OE or CE is high. |
| CE | Chip Enable | Active-low global enable; controls device activation and power state transition between active/standby. |
| OE | Output Enable | Active-low output gate; allows shared bus operation by disabling outputs without powering down chip. |
| VCC | Power Supply | Primary supply for read/standby modes; must be applied before/with VPP during programming. |
| VPP | Programming Voltage | 13.0 V input required only during programming; disconnected during normal read operation. |
| GND | Ground Reference | Common return path for VCC and VPP; requires local 0.1 µF ceramic decoupling per device. |
| NC | No Connect | Pins 1 and 17 - electrically isolated; must not be soldered or routed. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces production burn-in cycle duration by >90% vs. conventional EPROMs. |
| Dual-Voltage Read Operation | Functional across 3.0–3.6 V and 4.5–5.5 V - eliminates need for separate 3.3 V and 5 V system variants. |
| Integrated Product ID Code | Manufacturer ID = 0x1E, Device ID = 0x8C - enables auto-detection and algorithm matching in universal programmers. |
| JEDEC Pin Compatibility | Pin-for-pin match with AT27C256R - allows drop-in replacement in existing 5 V designs with minimal validation. |
| Low-Power Standby | 20 µA max ICC at 3.6 V - extends battery life in portable diagnostic tools and handheld test equipment. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic firmware and I/O mapping tables in DIN-rail mounted programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic startup sequence and runtime configuration data to the main MCU. Use Value: Industrial temperature rating (−40°C to +85°C) and 2,000 V ESD protection ensure reliable operation amid electrical noise and thermal cycling. |
Use Scenario: Replacing obsolete 5 V EPROMs in aging medical infusion pumps and laboratory analyzers where board redesign is cost-prohibitive. IC Role / Device Role / Timing Role: Pin-compatible OTP ROM delivering verified boot code with identical timing and signal integrity as original AT27C256R. Use Value: Dual-voltage support allows continued use of existing 5 V power rails while enabling future migration to 3.3 V subsystems. |
| Portable Test Equipment Configuration | Automated Calibration Data Storage |
Use Scenario: Holding calibration coefficients and sensor compensation tables in handheld multimeters and oscilloscope probes powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-power OTP memory minimizing standby current draw to extend field service intervals between charges. Use Value: 20 µA max standby current at 3.6 V reduces average system quiescent load by >80% versus standard 5 V EPROM alternatives. |
Use Scenario: Storing factory-trimmed DAC offset/gain values and linearity correction maps in automated test fixtures used for semiconductor wafer probing. IC Role / Device Role / Timing Role: One-time programmable nonvolatile memory ensuring tamper-proof calibration data retention over 20+ years. Use Value: Rapid™ programming enables high-throughput calibration write cycles during final test, reducing fixture dwell time by ~40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-70JC | 5 V only (4.5–5.5 V); no low-voltage operation; same 70 ns speed grade and PLCC package. | Requires dedicated 5 V rail; unsuitable for battery-powered or mixed-voltage systems. | Select when legacy 5 V infrastructure prohibits voltage scaling and industrial temp is not required. |
| M27C256B-12F1 | 5 V only; 120 ns access; 28-pin SOIC (not PLCC); higher standby current (100 µA). | Lacks VPP programming support; uses different pinout and package - not pin-compatible. | Select only for new SOIC-based designs where footprint change is acceptable and 5 V supply is guaranteed. |
Compared with AT27C256R-70JC and M27C256B-12F1, the AT27LV256A-12JI uniquely supports both 3.3 V and 5 V operation in the same PLCC footprint, delivers lower standby power, and retains full programming compatibility with AT27C256R toolchains - making it the optimal upgrade path for industrial field-deployed systems.
Availability
AT27LV256A-12JI is available at Aetrix Electronics and suitable for industrial automation, legacy system refurbishment, and portable instrumentation requiring stable component supply across extended lifecycle windows.
Supply support for AT27LV256A-12JI 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 secure authentication ICs before its acquisition by Microchip Technology in 2016.
The AT27LV256A belongs to Atmel's low-voltage OTP EPROM product line, designed specifically for energy-constrained and mixed-voltage embedded systems where reliability, long-term data retention, and backward compatibility are critical.
FAQ
What is the maximum read access time specified for AT27LV256A-12JI?
The AT27LV256A-12JI is rated for a maximum read access time of 120 ns under all specified operating conditions - including VCC = 3.0–3.6 V or 4.5–5.5 V and temperature range −40°C to +85°C. This value is guaranteed across the industrial temperature range and defines the minimum clock period for synchronous bus interfaces.
Does AT27LV256A-12JI require a programming voltage (VPP) during normal read operation?
No, AT27LV256A-12JI does not require VPP during normal read operation. VPP = 13.0 V is only applied during programming and verification cycles. In read mode, the device operates solely from VCC (3.0–3.6 V or 4.5–5.5 V), and VPP must be disconnected or held at VCC to avoid damage.
Is AT27LV256A-12JI pin-compatible with AT27C256R?
Yes, AT27LV256A-12JI is JEDEC-pin-compatible with AT27C256R in the 32-lead PLCC package. All signal pins (A0–A14, O0–O7, CE, OE, VCC, GND) occupy identical positions, and NC pins align. However, AT27LV256A-12JI supports additional low-voltage operation and requires VPP for programming.
What decoupling capacitance is required for stable operation of AT27LV256A-12JI?
Each AT27LV256A-12JI requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple units, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point to suppress array-level supply ripple.
Can AT27LV256A-12JI be used in place of AT27C256R without hardware changes?
Yes, AT27LV256A-12JI can replace AT27C256R on existing PCBs using the same 32-lead PLCC footprint, provided VPP is either disconnected or switched off during read operation. Its 3.0–3.6 V capability adds flexibility, but the host system must ensure VPP is not inadvertently asserted during normal use.
AT27LV256A-12JI 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:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 120 ns
- Voltage - Supply:
- 3V ~ 3.6V, 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27LV256A-12JI FAQ
1.How can I place an order for AT27LV256A-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-12JI 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 AT27LV256A-12JI reliable?
The price and inventory of AT27LV256A-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-12JI is usually 5 days.
3.What payment methods are accepted for AT27LV256A-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-12JI?
AT27LV256A-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-12JI 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 AT27LV256A-12JI?
For technical support, including AT27LV256A-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-12JI requirements.
6.How does Aetrix verify that AT27LV256A-12JI is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-12JI 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 AT27LV256A-12JI meets industry standards.
7.What is the process for return or replacement of AT27LV256A-12JI?
All AT27LV256A-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-12JI, 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 AT27LV256A-12JI part is unused and in its original packaging.
Return procedure for AT27LV256A-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27LV256A-12JI 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…
