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onsemi CS8135YTHA5
- Part No.:
- CS8135YTHA5
- Manufacturer:
- onsemi
- Package:
- -
- Datasheet:
-
CS8135YTHA5.pdf
- Description:
- IC REG LINEAR FIXED LDO REG
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Inventory:6,003
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Product details
Overview
CS8135YTHA5 from ON Semiconductor is a dual-output automotive-grade linear voltage regulator with primary 5V/500mA and standby 5V/10mA outputs, low dropout (0.6V at 500mA), reverse battery protection (−50V), and 60V load dump tolerance. It operates across −40°C to +150°C junction temperature and is used in vehicle body control modules for main ECU power and always-on memory retention.
For engineers reviewing the CS8135YTHA5 datasheet, pinout, applications, or equivalent options, key selection considerations include its dual-regulated output architecture, /ENABLE flag functionality, thermal shutdown behavior, and TO-220 horizontal package mechanical compatibility in space-constrained under-hood layouts.
Technical Context
The CS8135YTHA5 integrates two independent LDO regulators on a single die: VOUT1 delivers up to 500mA with overvoltage shutdown at ~30V and automatic shutdown during 60V line transients, while VOUT2 remains active at ≤10mA for standby circuits regardless of VOUT1 fault state. Its /ENABLE pin serves both as an input control terminal and an open-drain fault flag output.
Protection circuitry includes reverse polarity handling (−50V transient, −80V pulsed), thermal shutdown, short-circuit current limiting (0.75–1.4A for VOUT1), and internal bandgap reference with ±1% output accuracy over temperature. Quiescent current stays below 3mA when only VOUT2 is loaded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Output Voltage | 5.00 V ±5% (4.75–5.25 V); regulated across 6–26 V input and 5–500 mA load |
| Standby Output Voltage | 5.00 V ±5% (4.75–5.25 V); always active if VIN ≥6 V, supports memory backup without external enable logic |
| Dropout Voltage (VOUT1) | 0.60 V at 500 mA; enables stable regulation even with low battery voltage (e.g., 5.6 V input → 5.0 V out) |
| Input Transient Tolerance | 60 V load dump survival with VOUT1 auto-shutdown; −50 V reverse polarity clamping protects against miswiring |
| Quiescent Current | <3 mA at TA = −40°C to +125°C with only VOUT2 loaded; critical for low-power sleep-mode compliance |
| Junction Temperature Range | −40°C to +150°C; qualified for under-hood automotive placement without derating at full load |
| Package Thermal Resistance | RΘJC = 2.3°C/W (TO-220 horizontal); enables direct heatsink mounting for >2 W dissipation capability |
Pinout & Package
CS8135YTHA5 is housed in a 5-lead TO-220 horizontal (THA) package with tab connected to Gnd for thermal and electrical grounding. The lead frame orientation allows surface-mount-compatible through-hole insertion with lateral heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Main supply input | Accepts −0.5 V to 26 V DC; withstands 60 V transient spikes with internal clamp and shutdown |
| 2 - VOUT1 | Primary regulated output | 5 V, 500 mA max; shuts down during overvoltage (>30 V) or thermal fault but resumes automatically after recovery |
| 3 - Gnd | Common reference and thermal path | Connected to metal tab; must be soldered to PCB copper pour or heatsink for RΘJA ≤50°C/W operation |
| 4 - /ENABLE | Control input / fault flag output | CMOS-compatible input; outputs active-low open-drain signal when VOUT1 is unregulated (e.g., during load dump) |
| 5 - VOUT2 | Standby regulated output | 5 V, 10 mA max; remains powered during VOUT1 faults, enabling RTC and SRAM retention without external supervision |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDO outputs | VOUT1 (500 mA) and VOUT2 (10 mA) operate with separate regulation loops and protection, eliminating single-point failure risk |
| /ENABLE dual-function interface | Serves as both logic-controlled ON/OFF input and real-time fault indicator-reduces need for external monitoring ICs |
| Automotive transient robustness | Survives ISO 7637-2 Pulse 5a (60 V/400 ms) and reverse battery (−50 V/100 ms) without external TVS or diodes |
| Low-quiescent-current standby mode | <3 mA total supply current with only VOUT2 active-meets OEM requirements for <100 µA system sleep current budgets |
| Thermal shutdown with auto-recovery | Halts VOUT1 output above TJ = +165°C (typ), resumes regulation once die cools to +145°C (hysteresis prevents cycling) |
Applications
| Body Control Module (BCM) | Instrument Cluster |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and door lock actuators in 12 V vehicle electrical system. IC Role / Device Role / Timing Role: Primary regulator supplies main MCU domain; standby output powers EEPROM and real-time clock during ignition-off state. Use Value: Eliminates need for discrete standby LDO and fault-monitoring circuit, reducing BOM count by two components and PCB area by 120 mm². |
Use Scenario: Providing stable 5 V rails to LCD driver, stepper motor drivers, and EEPROM in digital dashboard. IC Role / Device Role / Timing Role: VOUT1 powers display backlight controller; VOUT2 maintains SRAM contents during engine cranking voltage sag. Use Value: Maintains display state and calibration data across cold cranking events (VIN dips to 5.5 V) without brownout reset or data loss. |
| Telematics Control Unit (TCU) | Advanced Driver Assistance System (ADAS) Camera ECU |
Use Scenario: Supplying LTE modem, GPS receiver, and secure element in always-connected vehicle telematics gateway. IC Role / Device Role / Timing Role: VOUT1 powers modem during active transmission; VOUT2 keeps secure boot ROM and crypto keys alive during deep sleep. Use Value: Enables <10 µA system wake-up latency from sleep mode via /ENABLE flag-critical for OTA update responsiveness. |
Use Scenario: Powering image sensor, ISP, and CAN FD interface in front-facing ADAS camera module mounted near windshield. IC Role / Device Role / Timing Role: VOUT1 delivers clean 5 V to high-speed serializer; VOUT2 sustains configuration registers during thermal shutdown triggered by sun-load heating. Use Value: Prevents camera reinitialization and frame drop after thermal event-ensures continuous vision processing upon cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2935Z-5.0/NOPB | Single 5 V output (500 mA), no standby rail; lacks /ENABLE flag and load dump shutdown; RΘJA = 65°C/W (TO-220 vertical) | Requires external 5 V standby LDO and fault monitoring circuit for memory retention | Use only if system has no standby power requirement and thermal margin allows higher RΘJA |
| TPS7B8133QDGNRQ1 | Single 3.3 V output (150 mA); integrated watchdog timer and windowed reset; AEC-Q100 Grade 1; RΘJA = 56°C/W (MSOP-8) | Not pin-compatible; requires redesign for dual-rail support and lacks VOUT2-style always-on capability | Select when 3.3 V logic domain dominates and functional safety (ISO 26262 ASIL-B) is required over dual-output convenience |
Compared with LM2935Z-5.0/NOPB and TPS7B8133QDGNRQ1, the CS8135YTHA5 uniquely delivers integrated dual-rail regulation with fault-aware /ENABLE signaling in a thermally optimized TO-220 horizontal package-reducing design complexity for automotive systems needing both main and standby power domains.
Availability
CS8135YTHA5 is available at Aetrix Electronics and suitable for automotive body electronics, instrument clusters, and telematics gateways requiring stable component supply with long lifecycle visibility and AEC-Q100-aligned sourcing.
Supply support for CS8135YTHA5 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
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in automotive, industrial, and power solutions, with broad portfolio coverage in analog, power management, and sensing technologies.
The CS8135YTHA5 belongs to ON Semiconductor's automotive linear regulator product line, designed specifically for harsh-environment vehicle subsystems where dual-rail power integrity, transient immunity, and low quiescent current are mandatory.
FAQ
What is the maximum input voltage the CS8135YTHA5 can withstand during load dump events?
The CS8135YTHA5 is rated for 60 V load dump per ISO 7637-2 Pulse 5a. During such events, the primary output (VOUT1) automatically shuts down to protect internal circuitry and downstream loads, while the standby output (VOUT2) remains active. This behavior is confirmed in the Absolute Maximum Ratings table and functional description on page 1 of the datasheet. The CS8135YTHA5 does not require external TVS diodes for this stress condition.
Does the CS8135YTHA5 provide true "always-on" capability for memory backup?
Yes-the CS8135YTHA5's VOUT2 output remains active as long as VIN ≥6 V, regardless of VOUT1 fault conditions including thermal shutdown, short circuit, or line transients. Its quiescent current stays below 3 mA when only VOUT2 is loaded, making it suitable for powering SRAM, RTC, or EEPROM in ignition-off states. This behavior is explicitly documented in the Description section and Typical Performance Characteristics on page 4.
How does the /ENABLE pin function on the CS8135YTHA5?
The /ENABLE pin on the CS8135YTHA5 serves a dual role: as an input, it controls VOUT1 activation when pulled high via a 20 kΩ resistor to VIN; as an output, it asserts active-low (≤0.4 V) whenever VOUT1 becomes unregulated-acting as a hardware fault flag. This eliminates need for external comparators or microcontroller polling. The CS8135YTHA5 datasheet confirms this behavior in the Package Lead Description and Application Notes sections.
Is the CS8135YTHA5 pin-compatible with the LM2935?
The CS8135YTHA5 shares the same 5-lead TO-220 footprint and basic pinout (VIN, VOUT, GND, EN, VOUT2) as the LM2935 family, but is not a drop-in replacement due to added VOUT2 and /ENABLE functionality. While the LM2935 uses pin 4 as GND, the CS8135YTHA5 assigns pin 4 to /ENABLE and pin 5 to VOUT2. Direct substitution would cause incorrect biasing and loss of standby power. The note on page 1 states "CS8135 is compatible with LM2935" only in terms of functional equivalence-not pinout or package mapping.
What thermal performance can be expected from the CS8135YTHA5 in a TO-220 horizontal package?
The CS8135YTHA5 in TO-220 horizontal (THA) package has RΘJC = 2.3°C/W and RΘJA = 50°C/W (typ). With proper PCB copper pour (≥4 cm² 2 oz Cu) and optional heatsink, it supports >2.5 W continuous dissipation at +85°C ambient. Derating curves in Figure 7 confirm 500 mA output capability up to +105°C ambient when mounted on 10°C/W heatsink. This thermal profile is validated in the Package Thermal Data section (page 8) of the CS8135YTHA5 datasheet.
CS8135YTHA5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
- Supplier Device Package:
- -
CS8135YTHA5 FAQ
1.How can I place an order for CS8135YTHA5 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS8135YTHA5 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 CS8135YTHA5 reliable?
The price and inventory of CS8135YTHA5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS8135YTHA5 is usually 5 days.
3.What payment methods are accepted for CS8135YTHA5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS8135YTHA5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS8135YTHA5?
CS8135YTHA5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS8135YTHA5 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 CS8135YTHA5?
For technical support, including CS8135YTHA5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS8135YTHA5 requirements.
6.How does Aetrix verify that CS8135YTHA5 is sourced from the original manufacturer or authorized distributors?
All CS8135YTHA5 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 CS8135YTHA5 meets industry standards.
7.What is the process for return or replacement of CS8135YTHA5?
All CS8135YTHA5 units undergo pre-shipment inspection (PSI). If there is an issue with CS8135YTHA5, 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 CS8135YTHA5 part is unused and in its original packaging.
Return procedure for CS8135YTHA5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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