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onsemi CS8122YT5G
- Part No.:
- CS8122YT5G
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
CS8122YT5G.pdf
- Description:
- IC REG LDO LIN 750MA 5V TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:51,362
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Product details
Overview
CS8122YT5G from onsemi is a 5.0 V ±2.0% low-dropout linear regulator delivering up to 750 mA output current with 0.6 V dropout at 0.5 A, integrated delayed RESET function programmable via external RC network, and automotive-grade fault protection including −50 V reverse transient, +60 V load dump, short-circuit (1.2 A typ), and thermal shutdown - used in engine control units and body electronics requiring robust power sequencing.
For engineers reviewing the CS8122YT5G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, exact pin functions, real-world design meaning of specifications, and two confirmed alternative regulators for automotive power supply designs.
Technical Context
The CS8122YT5G integrates a precision bandgap reference, anti-saturation output stage, and dual hysteresis comparators for both RESET and delay functions - enabling stable operation down to 1.0 V output while maintaining accurate threshold detection (VRT(ON) = 4.90 V, VRT(OFF) = 4.50 V). Its latching discharge circuit fully resets the delay capacitor during any brief fault, ensuring deterministic RESET pulse generation.
It features internally limited power dissipation, reverse-battery protection (−30 V DC), and overvoltage shutdown at 40 V - all implemented without external components. The regulator's ripple rejection exceeds 54 dB at 120 Hz and maintains stability with 10 µF aluminum electrolytic output capacitors having ≥1.0 Ω ESR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2.0% (4.9–5.1 V range ensures compatibility with 5 V logic and microcontrollers without additional regulation) |
| Dropout Voltage | 0.6 V @ 500 mA (enables operation with VIN as low as 5.6 V while sustaining full load) |
| Output Current | 750 mA continuous (supports multiple downstream ICs or sensors in automotive modules) |
| RESET Threshold | VOUT < 4.65 V (ON), > 4.90 V (OFF); 250 mV hysteresis prevents chatter during brownout recovery |
| Delay Time | 16–48 ms with 0.1 µF capacitor (configurable reset hold-off for MCU boot timing compliance) |
| Fault Protection | −50 V reverse transient, +60 V load dump, short-circuit (1.2 A typ), thermal shutdown (150 °C trip) |
| Ripple Rejection | ≥54 dB @ 120 Hz (suppresses alternator ripple in vehicle electrical systems) |
Pinout & Package
CS8122YT5G is housed in a Pb-free TO-220 5-lead package (Case 314D) with copper tab for heatsink attachment. Thermal resistance is RJC = 2.1 °C/W and RJA = 50 °C/W (typ).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Unregulated input supply | Accepts −0.5 V to 26 V; withstands −50 V transients and +60 V load dumps without damage |
| 2 - VOUT | Regulated 5.0 V output | Delivers up to 750 mA; requires ≥10 µF output capacitor with ≥1.0 Ω ESR for stability |
| 3 - GND | Ground reference | Common return path for regulator, RESET, and delay circuits; must be low-impedance |
| 4 - Delay | Timing capacitor connection | Sources 10 µA (typ) to charge external capacitor; sinks current to discharge it during fault |
| 5 - RESET | Open-collector reset output | Drives low when VOUT < 4.65 V; CMOS/TTL compatible; requires pull-up resistor |
Key Features
| Feature | Design Value |
|---|---|
| Externally programmable RESET delay | Configurable 16–48 ms window using single capacitor - eliminates need for discrete timer IC in ECU power sequencing |
| Dual hysteresis comparators | 250 mV RESET hysteresis + 400 mV delay hysteresis - prevents false triggering from noise or slow-rising VOUT |
| Latching delay capacitor discharge | Full discharge occurs even during sub-millisecond faults - guarantees clean, repeatable RESET assertion after any dropout |
| Automotive-grade transient protection | Rated for −50 V reverse transients and +60 V load dump per ISO 7637-2 - enables direct battery connection without external TVS |
| Low dropout at high current | 0.35 V (typ) dropout at 500 mA - maximizes efficiency and usable input voltage range in 12 V systems |
Applications
| Engine Control Unit (ECU) Power Supply | Body Control Module (BCM) Core Regulator |
|---|---|
|
Use Scenario: Primary 5 V supply for MCU, CAN transceivers, and analog sensors in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Main LDO providing regulated rail with synchronized RESET signal for safe MCU boot and fault recovery. Use Value: Integrated delay and hysteresis eliminate external timing components; −50 V/+60 V tolerance removes need for discrete protection diodes. |
Use Scenario: Central 5 V regulator powering door lock controllers, lighting drivers, and LIN transceivers in vehicle body electronics. IC Role / Device Role / Timing Role: Fault-tolerant power source with programmable reset hold-off to coordinate multi-rail power-up sequences. Use Value: 750 mA output supports mixed-signal loads; latching discharge ensures reliable reset after intermittent battery dips. |
| Transmission Control Module (TCM) | Advanced Driver Assistance Systems (ADAS) Sensor Hub |
|
Use Scenario: Powering transmission solenoid drivers, position sensors, and communication interfaces under high-temperature under-hood conditions. IC Role / Device Role / Timing Role: High-reliability LDO with thermal shutdown and wide input range for harsh environment operation. Use Value: RJA = 50 °C/W and 150 °C thermal shutdown enable operation up to 125 °C ambient with minimal heatsinking. |
Use Scenario: Local 5 V supply for radar preprocessing units, camera interface ICs, and power management in ADAS domain controllers. IC Role / Device Role / Timing Role: Precision-regulated rail with accurate RESET signaling to ensure deterministic sensor initialization after cold crank. Use Value: 2.0% output tolerance and 54 dB ripple rejection maintain signal integrity for sensitive analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5 V automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCV8664ST50T3G | Fixed 5.0 V, ±2.0%, 500 mA output; no RESET delay; lower quiescent current (35 µA) | Lacks programmable RESET delay and latching discharge; suitable only where simple reset suffices | Choose when board space is constrained and delay functionality is unnecessary |
| TLV73350PDBVR | 5.0 V, ±1.0%, 300 mA; 0.22 V dropout @ 300 mA; no fault protection beyond thermal/short-circuit | No reverse-battery, load dump, or transient protection; not qualified for automotive use | Select only for non-automotive industrial applications with clean, regulated input |
Compared with NCV8664ST50T3G and TLV73350PDBVR, the CS8122YT5G uniquely combines 750 mA drive, programmable RESET delay, and full ISO 7637-2 transient immunity - making it the only option among the three qualified for direct battery-connected automotive modules requiring robust power sequencing.
Availability
CS8122YT5G is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control systems requiring stable component supply, long-term automotive lifecycle support, and traceable Pb-free sourcing.
Supply support for CS8122YT5G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics for automotive, industrial, cloud, and consumer markets.
The CS8122YT5G belongs to onsemi's SMART REGULATOR® family - engineered specifically for automotive power management with integrated protection, precise reset timing, and ruggedized operation across extended temperature and voltage ranges.
FAQ
What is the minimum input voltage required for CS8122YT5G to maintain regulation at 750 mA?
The CS8122YT5G requires VIN ≥ VOUT + Dropout. With 5.0 V output and max dropout of 0.60 V at 500 mA (and higher at full 750 mA), VIN must be ≥ 5.7 V to sustain regulation at full load. At 750 mA, typical dropout rises to ~0.75 V, so 5.75 V minimum is recommended. The device remains functional down to VIN = −0.5 V but will not regulate below the dropout threshold.
Does CS8122YT5G require an external pull-up resistor on the RESET pin?
Yes, the RESET pin is an open-collector NPN output and requires an external pull-up resistor to VOUT or another logic rail. Typical values range from 4.7 kΩ to 10 kΩ. Without pull-up, RESET cannot assert a valid high level, breaking compatibility with MCUs expecting active-low reset with defined logic thresholds.
Can CS8122YT5G operate with ceramic output capacitors?
No - the CS8122YT5G is unstable with low-ESR ceramic capacitors. The datasheet explicitly requires ≥1.0 Ω ESR, achieved only with aluminum or tantalum electrolytics. Using ceramic capacitors causes oscillation due to insufficient phase margin; Figure 11 confirms stable region only with ESR ≥1.0 Ω.
What is the purpose of the Delay pin on CS8122YT5G, and how is it configured?
Pin 4 (Delay) sources 10 µA (typ) to charge an external capacitor; when VOUT drops below 4.50 V, it switches to sink mode and fully discharges the capacitor. The voltage across the capacitor determines delay time (e.g., 0.1 µF yields 16–48 ms). This pin enables precise, externally adjustable reset hold-off without additional ICs.
Is CS8122YT5G qualified for automotive applications, and what standards does it meet?
Yes, CS8122YT5G is AEC-Q100 qualified and designed for automotive use. It meets ISO 7637-2 for load dump (+60 V) and reverse polarity (−50 V transient), operates from −40 °C to +125 °C junction temperature, and includes built-in protection against thermal runaway, short circuit, and reverse battery - fulfilling core requirements for under-hood ECUs.
CS8122YT5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
CS8122YT5G FAQ
1.How can I place an order for CS8122YT5G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS8122YT5G 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 CS8122YT5G reliable?
The price and inventory of CS8122YT5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS8122YT5G is usually 5 days.
3.What payment methods are accepted for CS8122YT5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS8122YT5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS8122YT5G?
CS8122YT5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS8122YT5G 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 CS8122YT5G?
For technical support, including CS8122YT5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS8122YT5G requirements.
6.How does Aetrix verify that CS8122YT5G is sourced from the original manufacturer or authorized distributors?
All CS8122YT5G 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 CS8122YT5G meets industry standards.
7.What is the process for return or replacement of CS8122YT5G?
All CS8122YT5G units undergo pre-shipment inspection (PSI). If there is an issue with CS8122YT5G, 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 CS8122YT5G part is unused and in its original packaging.
Return procedure for CS8122YT5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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