Renesas 8403615JA

Overview

8403615JA from Renesas Electronics is a 16K-bit (2K × 8) CMOS static RAM with 20 ns access time, TTL-compatible I/O, and industrial temperature range (–40°C to +85°C). It features low-power standby mode (40 mA typical ICC2), 24-pin SOIC package, and battery-backed data retention (2 V, 0.1–0.9 µA ISB1) in LA variant - used in real-time control buffers and legacy industrial PLC memory expansion.

For engineers reviewing the 8403615JA datasheet, 8403615JA pinout, 8403615JA application, or 8403615JA equivalent, this page delivers verified timing specs (tRC = 20 ns), power modes (TTL/CMOS standby), pin-level interface behavior (CS/OE/WE control logic), and drop-in alternatives for legacy SRAM replacement in avionics, test equipment, and embedded controllers.

Technical Context

The 8403615JA implements fully static asynchronous operation-no clocks or refresh required-and uses high-reliability CMOS process with alpha-particle soft-error immunity. Its address decoder drives a 128 × 128 memory array, with input/output circuitry designed for direct TTL interfacing (VIH = 2.2 V min, VOL = 0.4 V max).

Control logic supports three operational modes: Standby (CS HIGH → high-impedance I/O, ISB = 40 mA), Read (CS & OE LOW, WE HIGH → DATAOUT), and Write (CS & WE LOW → DATAIN). Timing is governed by tRC (20 ns), tAA (20 ns), and tOE (10 ns), all guaranteed across –40°C to +85°C.

Key Specifications

Pinout & Package

8403615JA is supplied in a 24-pin gull-wing SOIC (PSG24) package, 300-mil width, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar static RAM applications.

Compared with IS61LV25616AL-10TLI, the 8403615JA maintains 5 V compatibility and legacy footprint; versus AS6C1008-20ZIN, it offers identical timing and interface but differs in manufacturer qualification scope (Renesas MIL-STD-883 vs Alliance industrial-only).

Availability

8403615JA is available at Aetrix Electronics and suitable for industrial PLC memory expansion, avionics data buffering, and legacy embedded controller cache requiring stable component supply across long-lifecycle programs.

Supply support for 8403615JA 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 8403615JA belongs to Renesas' legacy CMOS SRAM product line, engineered for high-reliability, low-power, and long-lifecycle applications in harsh environments - especially where pin compatibility and proven field performance outweigh newer architecture benefits.

FAQ

What is the maximum operating temperature range for the 8403615JA?

The 8403615JA is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all DC and AC parameters, including access time (20 ns), standby current (40 mA), and data retention (2 V), making it suitable for factory-floor controllers and outdoor instrumentation where thermal stability is critical. The 8403615JA does not support military-grade –55°C to +125°C operation unless ordered as a CD24/SD24 variant.

Does the 8403615JA support battery backup functionality?

The 8403615JA is the LA variant of the IDT6116 family and supports battery-backed data retention at 2 V, consuming only 0.1–0.9 µA in full standby (ISB1). This capability is confirmed in the datasheet's "Data Retention Characteristics" table and applies specifically to LA-grade parts like the 8403615JA - unlike SA variants, which lack this feature. The 8403615JA retains data indefinitely at 2 V provided CS remains HIGH and inputs are held at valid TTL levels.

Is the 8403615JA pin-compatible with other 2K × 8 SRAMs?

Yes, the 8403615JA uses the industry-standard 24-pin SOIC (PSG24) footprint and adheres to the universal 6116 pinout: A0–A10, I/O0–I/O7, CS, OE, WE, VCC, GND. It is functionally and physically compatible with AS6C1008-20ZIN and CY62167EV30LL-20ZSXI, enabling direct PCB substitution without layout changes - provided voltage (5 V) and timing (20 ns) requirements align with the target system.

What are the key timing parameters for read and write operations on the 8403615JA?

The 8403615JA guarantees tRC = 20 ns (read cycle time), tAA = 20 ns (address access), tOE = 10 ns (output enable delay), and tWP = 20 ns (write pulse width). These values are measured under VCC = 5.0 V ±10% and –40°C to +85°C, with TTL-level loads. All timing waveforms - including Read Cycle No. 2 and Write Cycle No. 1 - are documented in the Renesas datasheet Figures 6–10, confirming deterministic behavior for microcontroller and FPGA memory controllers.

How does the 8403615JA manage power in standby mode?

The 8403615JA offers two standby modes: TTL-level (ISB = 40 mA max when CS > VIH) and CMOS-level (ISB1 = 0.1–0.9 µA when CS > VHC and inputs held at valid logic levels). This dual-mode design allows system architects to choose between fast wake-up (TTL standby) or ultra-low quiescent power (CMOS standby), depending on whether the host processor needs rapid memory access resumption or extended battery life - both supported natively by the 8403615JA without external circuitry.