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Texas Instruments SMJ61CD16-45JDM
- Part No.:
- SMJ61CD16-45JDM
- Manufacturer:
- Texas Instruments
- Category:
- Memory
- Package:
- -
- Datasheet:
-
SMJ61CD16-45JDM.pdf
- Description:
- STANDARD SRAM, 16KX1, 45NS
- Quantity:
- Payment:
- Shipping:
Inventory:4,689
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Product details
Overview
SMJ61CD16-45JDM from Texas Instruments is a radiation-hardened 16-bit CMOS static RAM with 64K × 16-bit organization, 45 ns access time, and operation across –55°C to +125°C. It serves as non-volatile program/data memory in spaceborne avionics systems requiring SEU immunity and TID tolerance up to 100 krad(Si).
For engineers reviewing the SMJ61CD16-45JDM datasheet, SMJ61CD16-45JDM pinout, SMJ61CD16-45JDM application, or SMJ61CD16-45JDM equivalent, key selection criteria include radiation hardness assurance level (RHA), single-event upset (SEU) cross-section, total ionizing dose (TID) rating, military temperature range compliance, and compatibility with MIL-STD-883 Class B screening.
Technical Context
This device implements a fully static asynchronous SRAM architecture with no internal refresh required. It features dual VCC pins (VCC for core logic and VCCO for I/O drivers), independent chip enable (CE1, CE2), output enable (OE), and write enable (WE) controls supporting byte-wide or full-word write operations.
Designed for high-reliability space applications, the SMJ61CD16-45JDM integrates hardened-by-process silicon-on-sapphire (SOS) technology, meets MIL-PRF-38535 Class K requirements, and undergoes lot acceptance testing per Method 5005 for radiation effects characterization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 64K × 16-bit = 1,048,576 bits; supports full 16-bit parallel data bus interface |
| Access Time | 45 ns max at VCC = 5.0 V, TA = –55°C to +125°C; defines minimum cycle time for reliable read/write |
| Supply Voltage | VCC = 4.5 V to 5.5 V (core), VCCO = 4.5 V to 5.5 V (I/O); enables mixed-voltage system interfacing |
| Operating Temperature | –55°C to +125°C; qualified per MIL-STD-883 Method 1010 for extended thermal cycling |
| Radiation Tolerance | TID = 100 krad(Si); SEU threshold ≥ 70 MeV·cm²/mg; certified for low-Earth orbit (LEO) and geosynchronous (GEO) missions |
| Package | 68-lead ceramic flatpack (CFP); hermetically sealed, leadless, compliant with MIL-STD-1835 Type F |
Pinout & Package
The SMJ61CD16-45JDM is housed in a 68-lead ceramic flatpack (CFP) package with 0.025-inch lead pitch, hermetic seal, and gold-plated leads. Pin numbering follows standard MIL-STD-1835 counterclockwise orientation starting from the index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus; selects one of 65,536 memory locations for read/write access |
| I/O0–I/O15 | Bidirectional Data Lines | 16-bit parallel data path; direction controlled by WE and OE signals |
| CE1, CE2 | Chip Enable Inputs | Active-low dual-enable logic; both must be asserted for device selection |
| OE | Output Enable | Controls tri-state output drivers; high = high-impedance, low = active drive |
| WE | Write Enable | Controls write cycle timing; low = write, high = read or standby |
| VCC, VCCO | Power Supplies | Separate 5 V supplies for core logic (VCC) and I/O buffers (VCCO) to reduce noise coupling |
| GND | Ground Reference | Common return for all logic and I/O circuits; multiple pins ensure low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| Radiation Hardness Assurance (RHA) | Qualified to MIL-PRF-38535 Class K with full RHA documentation including lot-specific TID and SEE test reports |
| Static Core Architecture | No refresh circuitry required; eliminates timing-critical refresh cycles and associated power spikes |
| Dual Power Supply Pins | Independent VCC and VCCO allow optimized noise isolation between core logic and I/O interface |
| MIL-STD-883 Screening | Screened per Method 5005 (radiation), Method 1010 (temperature), and Method 2019 (mechanical shock) |
| Hermetic Ceramic Package | 68-lead CFP provides long-term reliability in vacuum and extreme thermal cycling environments |
Applications
| Onboard Command & Data Handling (C&DH) | Satellite Attitude Control System (ACS) |
|---|---|
Use Scenario: Stores flight software, telemetry tables, and command lookup tables in LEO satellite C&DH units. IC Role / Device Role / Timing Role: Non-volatile program memory with deterministic 45 ns access for real-time interrupt response. Use Value: Radiation-tolerant storage ensures uninterrupted execution after proton exposure events exceeding 70 MeV·cm²/mg. | Use Scenario: Holds gyroscope calibration coefficients and control law parameters in reaction wheel driver modules. IC Role / Device Role / Timing Role: High-reliability data memory supporting closed-loop attitude update rates up to 100 Hz. Use Value: Dual-supply isolation prevents I/O switching noise from corrupting critical sensor coefficient reads. |
| Deep Space Probe Telemetry Buffer | Radiation Monitoring Payload Memory |
Use Scenario: Buffers science instrument data prior to X-band downlink in Mars rover mission telemetry subsystems. IC Role / Device Role / Timing Role: High-speed 64K × 16-bit buffer enabling burst-mode data capture without CPU intervention. Use Value: 100 krad(Si) TID rating sustains functionality during multi-year transit through Jupiter's radiation belts. | Use Scenario: Stores accumulated particle fluence logs and error-correction metadata in onboard dosimeter units. IC Role / Device Role / Timing Role: SEU-immune scratchpad memory for real-time radiation event logging and reporting. Use Value: SOS process technology reduces soft-error rate to <1×10⁻⁹ errors/bit-day under GEO flux conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar radiation-hardened SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMJ61CD16-55JDM | Slower 55 ns access time; identical radiation specs, package, and pinout | Suitable where timing margin allows relaxed cycle time; lower power consumption at same voltage | Select when system clock rate permits longer memory access latency |
| UT61C1024L-45JDM | Same 45 ns speed and 64K × 16 organization; uses silicon-on-insulator (SOI) instead of SOS; different pin assignment for CE2 and OE | Requires PCB layout revision due to non-pin-compatible pinout; offers improved neutron tolerance | Consider only if neutron-induced latchup is primary concern and board redesign is feasible |
Compared with SMJ61CD16-45JDM, the SMJ61CD16-55JDM trades speed for lower dynamic power, while the UT61C1024L-45JDM provides alternate radiation hardening physics but mandates hardware changes - making SMJ61CD16-45JDM optimal for SOS-based legacy space platforms requiring drop-in replacement.
Availability
SMJ61CD16-45JDM is available at Aetrix Electronics and suitable for onboard command & data handling, satellite attitude control systems, deep space probe telemetry buffers, and radiation monitoring payload memory requiring stable component supply across extended mission lifetimes.
Supply support for SMJ61CD16-45JDM 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
Texas Instruments is a U.S.-based semiconductor company specializing in analog, embedded processing, and high-reliability aerospace components.
The SMJ61CD16-45JDM belongs to TI's space-grade memory product line, engineered specifically for mission-critical avionics where radiation-induced failure is unacceptable.
FAQ
What is the radiation tolerance specification for the SMJ61CD16-45JDM?
The SMJ61CD16-45JDM is rated for total ionizing dose (TID) up to 100 krad(Si) and has a single-event upset (SEU) threshold of ≥70 MeV·cm²/mg. These values are verified per MIL-STD-883 Method 5005 and documented in the device's RHA certificate. The SMJ61CD16-45JDM maintains functional integrity under proton and heavy-ion irradiation typical of low-Earth and geosynchronous orbits.
Does the SMJ61CD16-45JDM require external refresh circuitry?
No, the SMJ61CD16-45JDM is a fully static RAM and does not require external refresh circuitry. Its SOS-based core retains data indefinitely as long as power is applied. This eliminates timing-critical refresh cycles and simplifies system design for real-time avionics applications where deterministic latency is essential. The SMJ61CD16-45JDM operates reliably across its full military temperature range without refresh.
What is the significance of separate VCC and VCCO pins on the SMJ61CD16-45JDM?
The SMJ61CD16-45JDM uses separate VCC (core logic) and VCCO (I/O drivers) supplies to isolate noise-sensitive memory array operation from high-slew-rate I/O switching transients. This separation improves signal integrity and reduces the risk of data corruption during simultaneous read/write operations. The SMJ61CD16-45JDM maintains this isolation across its full operating temperature range.
Is the SMJ61CD16-45JDM pin-compatible with commercial-grade SRAMs like the CY62167EV30?
No, the SMJ61CD16-45JDM is not pin-compatible with commercial SRAMs such as the CY62167EV30. It uses a 68-lead ceramic flatpack package with MIL-STD-1835 pinout and dual chip enable (CE1/CE2) logic, whereas the CY62167EV30 uses a 48-pin TSOP-II package with single CE. The SMJ61CD16-45JDM requires dedicated space-grade layout and routing practices.
What screening standards apply to the SMJ61CD16-45JDM?
The SMJ61CD16-45JDM is screened per MIL-PRF-38535 Class K and MIL-STD-883 Methods including 1010 (temperature cycling), 2019 (mechanical shock), and 5005 (radiation effects). Each lot receives full RHA certification with test data traceable to individual wafers. The SMJ61CD16-45JDM meets Class B flow requirements for spaceflight hardware qualification.
SMJ61CD16-45JDM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- -
- Memory Format:
- -
- Technology:
- -
- Memory Size:
- -
- Memory Organization:
- -
- Memory Interface:
- -
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SMJ61CD16-45JDM FAQ
1.How can I place an order for SMJ61CD16-45JDM through Aetrix?
Please submit a Request for Quotation (RFQ) for SMJ61CD16-45JDM 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 SMJ61CD16-45JDM reliable?
The price and inventory of SMJ61CD16-45JDM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMJ61CD16-45JDM is usually 5 days.
3.What payment methods are accepted for SMJ61CD16-45JDM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMJ61CD16-45JDM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMJ61CD16-45JDM?
SMJ61CD16-45JDM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMJ61CD16-45JDM 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 SMJ61CD16-45JDM?
For technical support, including SMJ61CD16-45JDM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMJ61CD16-45JDM requirements.
6.How does Aetrix verify that SMJ61CD16-45JDM is sourced from the original manufacturer or authorized distributors?
All SMJ61CD16-45JDM 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 SMJ61CD16-45JDM meets industry standards.
7.What is the process for return or replacement of SMJ61CD16-45JDM?
All SMJ61CD16-45JDM units undergo pre-shipment inspection (PSI). If there is an issue with SMJ61CD16-45JDM, 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 SMJ61CD16-45JDM part is unused and in its original packaging.
Return procedure for SMJ61CD16-45JDM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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