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Renesas ICL7673CBAZA
- Part No.:
- ICL7673CBAZA
- Manufacturer:
- Renesas
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7673CBAZA.pdf
- Description:
- IC OR CTRLR SRC SELECT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,204
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Product details
Overview
ICL7673CBAZA from Intersil is a monolithic CMOS automatic battery back-up switch IC that selects and connects the higher-voltage supply (VP or VS) to output VO using internal P-channel MOSFET switches. It operates from 2.5V to 15V, delivers ≤15Ω on-resistance at 5V input, consumes ≤5μA quiescent current, and provides open-drain status outputs PBAR/SBAR for real-time clock and volatile RAM keep-alive applications.
For engineers reviewing the ICL7673CBAZA datasheet, ICL7673CBAZA pinout, ICL7673CBAZA application, or ICL7673CBAZA equivalent, this page delivers verified specifications, SOIC-8 package details, functional block behavior, real-world use cases in RTC backup and low-power failover systems, and validated alternative parts with documented electrical and application differences.
Technical Context
The ICL7673CBAZA implements a break-before-make analog power switch using two independent P-channel MOSFETs (P1 and P2), controlled by an internal comparator that continuously monitors VP versus VS. Switching occurs within 50μs when the voltage difference exceeds ±10mV (typical switchover uncertainty).
It features dual open-drain N-channel outputs (PBAR and SBAR) tied to the comparator and inverter chain - PBAR asserts low when VP > VS (main power active), SBAR asserts low when VS > VP (battery active). Both outputs sink up to 3.2mA and exhibit saturation voltages as low as 40mV at 12V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.5V to 15V - supports both 3V battery and 5V/12V main rails without level-shifting. |
| Quiescent Current | ≤5μA at 25°C - enables multi-year operation on coin-cell batteries in RTC backup. |
| P1 On-Resistance | 8Ω typ. at VP=5V, VS=3V, ILOAD=15mA - limits insertion loss to <120mV under typical load. |
| P2 On-Resistance | 40Ω typ. at VS=3V, ILOAD=1mA - optimized for low-current backup paths like SRAM retention. |
| Switchover Uncertainty | ±10mV typ. - ensures clean, jitter-free transition between supplies with minimal voltage hysteresis. |
| Output Leakage (VP↔VS) | 0.01nA typ. - prevents battery drain during long-term storage or standby. |
| PBAR/SBAR Saturation | 40–400mV depending on VO and ISINK - compatible with TTL/CMOS logic inputs and external PNP base drive. |
Pinout & Package
ICL7673CBAZA is housed in an 8-lead SOIC (N) package (JEDEC MS-012, package drawing M8.15), RoHS-compliant with 100% matte tin termination, rated for reflow soldering and MSL-1 handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VO | Switched Output | Power output node connected to load (e.g., RTC VCC); driven by P1 or P2 based on VP/VS comparison. |
| 2 - VS | Backup Supply Input | Low-voltage battery input (e.g., 3V Li or NiCd); internally compared against VP to trigger switchover. |
| 3 - SBAR | Open-Drain Status Output | Active-low signal indicating VS is selected; sinks current when battery is active, usable for interrupt or LED indication. |
| 4 - GND | Ground Reference | Analog/digital common return; must be low-impedance to minimize switching noise and leakage error. |
| 5 - NC | No Connect | Internally unconnected; must remain floating - no external tie or pull-up/pull-down. |
| 6 - PBAR | Open-Drain Status Output | Active-low signal indicating VP is selected; used for system power-fail detection or external PNP transistor base drive. |
| 7 - VP | Main Supply Input | Primary DC rail input (e.g., 5V or 12V); higher potential than VS determines VO source via comparator decision. |
| 8 - NC | No Connect | Internally unconnected; must remain floating per datasheet - not for thermal pad or grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic VP/VS Selection | Comparator-driven switching ensures VO always tracks the higher of two supplies - no external control logic required. |
| Break-Before-Make Action | Guarantees no cross-conduction between VP and VS during transition - prevents short-circuit risk in dual-supply systems. |
| Low-Leakage Isolation | <0.01nA inter-supply leakage preserves battery life over years of RTC/SRAM backup operation. |
| External PNP Drive Support | PBAR/SBAR outputs directly interface with PNP transistors to scale current beyond 150mA - extends use to higher-load systems. |
| Wide-Temperature Stability | On-resistance temperature coefficient ≤0.7%/°C ensures predictable insertion loss across 0°C to 70°C industrial range. |
Applications
| Real-Time Clock (RTC) Keep-Alive | Volatile CMOS RAM Backup |
|---|---|
Use Scenario: Microcontroller-based embedded system maintains time-of-day and calendar data during AC mains failure using a 3V lithium coin cell. IC Role / Device Role / Timing Role: ICL7673CBAZA acts as autonomous power selector, connecting 3V battery to RTC VCC only when main 5V rail drops below battery voltage. Use Value: Eliminates need for discrete diode-OR or manual reset circuitry; reduces board space by >70% and cuts quiescent current vs. discrete solutions. |
Use Scenario: Industrial PLC retains configuration and process state in static RAM during unexpected power loss. IC Role / Device Role / Timing Role: ICL7673CBAZA supplies uninterrupted 3.3V or 5V to SRAM VCC, triggered by brown-out detection on main supply. Use Value: Prevents data corruption with sub-50μs switchover and <0.5V max voltage drop - meets JEDEC JESD78 latch-up immunity thresholds. |
| Over/Under-Voltage Detector | Portable Instrument Power Management |
Use Scenario: Battery-powered medical monitor detects when input adapter voltage falls outside safe operating window (e.g., 4.5–5.5V). IC Role / Device Role / Timing Role: ICL7673CBAZA compares adapter VP against precision reference VS; PBAR/SBAR outputs flag out-of-spec condition. Use Value: Enables dual-threshold detection without op-amps or ADC - leverages built-in comparator hysteresis and open-drain outputs for direct MCU GPIO interfacing. |
Use Scenario: Handheld test equipment uses rechargeable Li-ion (8.4V) and USB 5V input, requiring seamless fallback during cable disconnect. IC Role / Device Role / Timing Role: ICL7673CBAZA routes power from USB (VP) or battery (VS) to system LDO input, with PBAR signaling host connection status. Use Value: Supports hot-swap capability and eliminates user-visible reboot; low 1.5μA typ. IQ extends runtime in battery-only mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automatic battery back-up switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR29+T | Fixed 2.93V reset threshold; no dual-supply selection - functions as supervisor only, not power switch. | Cannot replace ICL7673CBAZA in power-path OR-ing; suitable only for reset generation, not VO routing. | Select only if system requires reset assertion on main supply loss, not continuous backup power delivery. |
| TPL7407LDR | 7-channel high-side driver with 500mA per channel; no built-in voltage comparator or automatic switchover logic. | Requires external microcontroller or comparator to manage VP/VS arbitration - adds BOM cost and firmware complexity. | Choose only when scalable multi-rail control is needed and discrete logic + FETs are acceptable for cost/performance trade-off. |
Compared with MAX6326UR29+T and TPL7407LDR, the ICL7673CBAZA uniquely integrates comparator, dual P-FET switches, and status outputs in one SOIC-8 package - delivering true autonomous power switchover without external components or software intervention.
Availability
ICL7673CBAZA is available at Aetrix Electronics and suitable for real-time clock keep-alive, volatile RAM backup, and over/under-voltage detector applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ICL7673CBAZA 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
Intersil Corporation is a precision analog and power management semiconductor company, now part of Renesas Electronics, with expertise in low-power, high-reliability IC design for industrial and embedded systems.
The ICL7673 product line was engineered specifically for autonomous, low-quiescent-power battery backup switching in memory and timing circuits - prioritizing leakage suppression, fast switchover, and minimal external component count.
FAQ
What is the primary function of the ICL7673CBAZA in a power system?
The ICL7673CBAZA serves as an autonomous analog power switch that continuously compares two DC inputs (VP and VS) and connects the higher-voltage source to the output VO using internal P-channel MOSFETs. It requires no external control signals, enabling zero-software, zero-component battery backup for RTCs and volatile RAM - a core capability confirmed in the FN3183 datasheet functional description and block diagram.
Does the ICL7673CBAZA support 3.3V logic-level systems?
Yes, the ICL7673CBAZA operates with input voltages as low as 2.5V, making it fully compatible with 3.3V main supplies and 3V lithium battery backups. Its PBAR and SBAR open-drain outputs sink current down to 40mV saturation at 3.3V VO, ensuring reliable interfacing with 3.3V CMOS inputs - verified in the Electrical Specifications table under "Open Drain Output Saturation Voltages".
Can the ICL7673CBAZA be used with rechargeable batteries?
Yes, the ICL7673CBAZA supports rechargeable battery chemistries including NiCd and Li-ion, as explicitly shown in Figure 8 (rechargeable battery backup) and Application section text. Its low 0.01nA typical leakage prevents self-discharge, and its wide 2.5V–15V input range accommodates 1.2V–4.2V per-cell variations - all confirmed in Absolute Maximum Ratings and Applications pages of FN3183 Rev 5.00.
What is the maximum continuous load current supported by the ICL7673CBAZA?
The ICL7673CBAZA supports up to 15mA through P1 (VP→VO) and 1mA through P2 (VS→VO) under standard conditions, with peak currents up to 38mA (VP) and 30mA (VS) specified in Absolute Maximum Ratings. For higher loads, external PNP transistors driven by PBAR/SBAR are recommended - detailed in Functional Block Diagram, Detailed Description, and Figure 11 of the FN3183 datasheet.
Is thermal derating required for the ICL7673CBAZA in SOIC-8 package?
Yes - the SOIC-8 package has θJA = 180°C/W, and the datasheet specifies derating of switch resistance and leakage with temperature. For example, P1 rDS(ON) increases from 8Ω (25°C) to 16Ω (+85°C), and leakage rises from 0.01nA to 35nA. Designers must verify worst-case insertion loss and thermal margin at maximum ambient temperature - values confirmed in Electrical Specifications and Thermal Information tables on pages 3–4 of FN3183 Rev 5.00.
ICL7673CBAZA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Source Selector Switch
- FET Type:
- N and P-Channel
- Ratio - Input:Output:
- 2:1
- Internal Switch(s):
- Yes
- Delay Time - ON:
- -
- Delay Time - OFF:
- -
- Current - Output (Max):
- 38mA
- Current - Supply:
- 1.5 µA
- Voltage - Supply:
- 2.5V ~ 15V
- Applications:
- Battery Backup, Industrial/Automotive, High Current Switch
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7673CBAZA FAQ
1.How can I place an order for ICL7673CBAZA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7673CBAZA 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 ICL7673CBAZA reliable?
The price and inventory of ICL7673CBAZA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7673CBAZA is usually 5 days.
3.What payment methods are accepted for ICL7673CBAZA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7673CBAZA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7673CBAZA?
ICL7673CBAZA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7673CBAZA 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 ICL7673CBAZA?
For technical support, including ICL7673CBAZA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7673CBAZA requirements.
6.How does Aetrix verify that ICL7673CBAZA is sourced from the original manufacturer or authorized distributors?
All ICL7673CBAZA 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 ICL7673CBAZA meets industry standards.
7.What is the process for return or replacement of ICL7673CBAZA?
All ICL7673CBAZA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7673CBAZA, 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 ICL7673CBAZA part is unused and in its original packaging.
Return procedure for ICL7673CBAZA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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