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Microchip Technology 25LC160B-E/ST
- Part No.:
- 25LC160B-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
25LC160B-E/ST.pdf
- Description:
- IC EEPROM 16KBIT SPI 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,565
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Product details
Overview
25LC160B-E/ST from Microchip Technology Inc. is a 16 Kbit (2048 × 8) SPI serial EEPROM with 32-byte page write capability, 10 MHz max clock frequency, and industrial/automotive temperature support (–40°C to +125°C). It operates from 2.5V to 5.5V, features hardware write protection via WP pin and STATUS register, and delivers 1 million erase/write cycles with >200 years data retention - used for firmware storage, calibration data logging, and configuration backup in automotive control units.
For engineers reviewing the 25LC160B-E/ST datasheet, 25LC160B-E/ST pinout, 25LC160B-E/ST application, or 25LC160B-E/ST equivalent, key selection criteria include page size (32 B), VCC range (2.5–5.5 V), HOLD functionality for interrupt-safe SPI pausing, and E-grade automotive qualification with Pb-free TSSOP-8 packaging.
Technical Context
The 25LC160B-E/ST implements a standard SPI Mode 0,0 interface with separate SI/SO lines and active-low CS, supporting byte and page writes within 32-byte physical boundaries. Its internal architecture includes a write-enable latch, STATUS register with WIP/WEL/BP bits, and HV generator for EEPROM cell programming.
Hardware write protection is configurable via the WP pin and nonvolatile WPEN bit, enabling selective block protection (none, 1/4, 1/2, or full array). The HOLD pin suspends ongoing SPI transfers without resetting state, allowing host microcontrollers to service higher-priority interrupts while preserving transaction integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 Kbit (2048 × 8 bits) - supports persistent storage of boot code, device IDs, or sensor calibration tables |
| Page Size | 32 bytes - enables efficient bulk writes without crossing page boundaries; requires software alignment |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V - allows high-speed read/write in resource-constrained embedded systems |
| Write Cycle Time | 5 ms max - defines minimum delay before polling WIP bit or initiating next operation |
| Endurance & Retention | 1,000,000 erase/write cycles; >200 years data retention - suitable for long-life automotive ECUs |
| Supply Voltage | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level shifting |
| Temperature Range | –40°C to +125°C (Automotive E-grade) - qualified for under-hood and powertrain applications |
| ESD Protection | >4000 V HBM - enhances robustness in manufacturing and field environments |
Pinout & Package
25LC160B-E/ST is housed in an 8-lead TSSOP package (ST suffix), 3.0 mm × 4.4 mm body, 0.65 mm pitch, Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable; deselects device and places SO in high-impedance to share SPI bus |
| SO (Pin 2) | Serial Data Output | Outputs memory data on falling edge of SCK during READ; tri-stated when CS high or HOLD low |
| WP (Pin 3) | Write-Protect Pin | Hardware lock for STATUS register when WPEN = 1; no effect if WPEN = 0 |
| VSS (Pin 4) | Ground Reference | Return path for all internal circuitry; must be low-impedance connection to system GND |
| SI (Pin 5) | Serial Data Input | Latches instructions, addresses, and write data on rising edge of SCK |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all SPI transactions; timing critical for AC parameter compliance |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI transfer (e.g., mid-page write) without losing state; requires SCK low to assert |
| VCC (Pin 8) | Supply Voltage | Power input for core and I/O; bypass capacitor (0.1 µF) required near pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte page write buffer | Enables faster bulk writes than byte-by-byte; reduces total write time by up to 32× vs. single-byte mode |
| Programmable block write protection | BP0/BP1 bits allow selective locking of upper 1/4, 1/2, or entire memory array - prevents accidental firmware overwrite |
| HOLD pin for SPI pause/resume | Preserves serial transaction state during MCU interrupt servicing - eliminates retransmission overhead |
| Self-timed erase/write cycles | Removes need for external timing control; internal WIP bit indicates completion for polling-based flow control |
| Power-on write protection | Write enable latch resets at power-up, preventing spurious writes during supply ramp-up or brownout |
| Industrial/automotive temperature grade | E-grade (–40°C to +125°C) qualification ensures reliability in engine control, ADAS, and battery management systems |
Applications
| Engine Control Unit (ECU) Calibration Storage | Automotive Infotainment Configuration Backup |
|---|---|
Use Scenario: Storing fuel map coefficients, ignition timing offsets, and OBD-II fault codes that must survive vehicle power cycling and extended thermal exposure. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced via SPI to MCU; accessed during startup and runtime for adaptive tuning. Use Value: 1M endurance and >200-year retention ensure calibration data integrity over full vehicle lifetime; E-grade temp range matches under-hood requirements. | Use Scenario: Preserving user preferences (volume, EQ settings, radio presets) and system firmware patch metadata across ignition cycles. IC Role / Device Role / Timing Role: SPI-connected EEPROM holding persistent settings; read at boot and written after user changes. Use Value: 32-byte page writes reduce update latency vs. byte writes; WP pin prevents corruption during power loss during write operations. |
| Body Control Module (BCM) Parameter Logging | Electric Power Steering (EPS) Motor Profile Storage |
Use Scenario: Recording door lock actuation counts, window position limits, and lighting timeout values for diagnostics and warranty analysis. IC Role / Device Role / Timing Role: Low-power serial memory accessed intermittently by BCM MCU; leverages standby current <1 µA at 2.5 V. Use Value: 2.5–5.5 V VCC range aligns with BCM's wide-input DC-DC output; HOLD pin allows safe logging during CAN bus interrupt handling. | Use Scenario: Storing torque-angle profiles, motor phase compensation tables, and safety-critical calibration offsets for real-time EPS control loops. IC Role / Device Role / Timing Role: High-reliability SPI EEPROM providing deterministic read access (<160 ns output valid) to safety-critical parameters. Use Value: 10 MHz max clock supports fast profile loading; >4 kV ESD rating withstands assembly and field ESD events near steering column harnesses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC160B-I/ST | Same silicon, Industrial grade (–40°C to +85°C); identical electrical specs and pinout | Not qualified for automotive under-hood use; lower cost where E-grade is not mandated | Select 25LC160B-I/ST for cabin modules or consumer-grade industrial controls requiring same functionality at lower qualification cost |
| AT25160B-MAHL-T | 16 Kbit SPI EEPROM, 32-byte page, but 5.5 V max VCC only; no HOLD pin; different STATUS register layout | Lacks HOLD functionality and automotive temp rating; uses different write-protection scheme (no WPEN bit) | Choose AT25160B-MAHL-T only if HOLD is unused and E-grade qualification is unnecessary; verify STATUS register compatibility in firmware |
Compared with 25LC160B-E/ST, the 25LC160B-I/ST offers identical performance at lower qualification cost but lacks automotive thermal margin, while the AT25160B-MAHL-T omits HOLD and WPEN-based hardware protection - making it unsuitable for safety-critical or interrupt-sensitive automotive deployments.
Availability
25LC160B-E/ST is available at Aetrix Electronics and suitable for automotive control units, infotainment systems, and body electronics requiring stable component supply with guaranteed E-grade qualification and Pb-free compliance.
Supply support for 25LC160B-E/ST 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
Microchip Technology Inc. is a leading provider of microcontroller, analog, and Flash-IP solutions, serving automotive, industrial, and consumer markets with high-reliability semiconductor products.
The 25LC160B-E/ST belongs to Microchip's 25XX160 family of SPI EEPROMs, designed specifically for robust, low-power nonvolatile data storage in automotive and industrial environments where endurance, retention, and temperature resilience are critical.
FAQ
What is the maximum clock frequency supported by the 25LC160B-E/ST?
The 25LC160B-E/ST supports up to 10 MHz SPI clock frequency when VCC is 4.5 V to 5.5 V. At 2.5 V ≤ VCC < 4.5 V, the maximum clock drops to 5 MHz, and at 1.8 V ≤ VCC < 2.5 V, it is 3 MHz - though the 25LC160B-E/ST's minimum VCC is 2.5 V, so the 3 MHz rating does not apply. This ensures timing compliance across its specified operating range.
Does the 25LC160B-E/ST support page write operations, and what is the page size?
Yes, the 25LC160B-E/ST supports page write operations with a fixed 32-byte page size - distinguishing it from the 'A' version (16-byte pages). Page writes must remain within a single physical page boundary; crossing boundaries causes wraparound. This capability is confirmed in the Device Selection Table and functional description of the 25LC160B-E/ST datasheet.
What temperature range is the 25LC160B-E/ST qualified for, and what does the 'E' suffix indicate?
The 'E' suffix in 25LC160B-E/ST denotes Automotive grade qualification, meaning it is tested and guaranteed to operate reliably from –40°C to +125°C. This extends beyond Industrial grade (–40°C to +85°C) and is essential for under-hood, powertrain, and ADAS applications where ambient temperatures exceed standard industrial limits.
How does the HOLD pin function on the 25LC160B-E/ST, and when is it useful?
The HOLD pin on the 25LC160B-E/ST pauses ongoing SPI communication (e.g., mid-page write) without resetting internal state. It must be asserted while SCK is low and releases on next SCK low-to-high transition. This is especially useful in automotive MCUs that must service CAN or timer interrupts without aborting EEPROM transactions - a feature explicitly documented for the 25LC160B-E/ST.
Is the 25LC160B-E/ST pin-compatible with other packages in the 25XX160 family, such as SOIC or PDIP?
Yes, the 25LC160B-E/ST in TSSOP-8 (ST) shares identical pinout and signal mapping with the SOIC-8 (SN) and PDIP-8 (P) variants per the Pin Function Table and Package Types diagram. All versions use the same 8-pin arrangement: CS, SO, WP, VSS, SI, SCK, HOLD, VCC - enabling direct PCB footprint interchangeability where package height and thermal constraints permit.
25LC160B-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 10 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
25LC160B-E/ST FAQ
1.How can I place an order for 25LC160B-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC160B-E/ST 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 25LC160B-E/ST reliable?
The price and inventory of 25LC160B-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC160B-E/ST is usually 5 days.
3.What payment methods are accepted for 25LC160B-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC160B-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC160B-E/ST?
25LC160B-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC160B-E/ST 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 25LC160B-E/ST?
For technical support, including 25LC160B-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC160B-E/ST requirements.
6.How does Aetrix verify that 25LC160B-E/ST is sourced from the original manufacturer or authorized distributors?
All 25LC160B-E/ST 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 25LC160B-E/ST meets industry standards.
7.What is the process for return or replacement of 25LC160B-E/ST?
All 25LC160B-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 25LC160B-E/ST, 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 25LC160B-E/ST part is unused and in its original packaging.
Return procedure for 25LC160B-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25LC160B-E/ST Tags
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