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NXP Semiconductors TDA3661AT/N1,118
- Part No.:
- TDA3661AT/N1,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TDA3661AT/N1,118.pdf
- Description:
- TDA3661 - IC VOLT REG ADJUSTABLE
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
TDA3661AT/N1,118 from NXP Semiconductors (formerly Philips Semiconductors) is an adjustable low-dropout linear voltage regulator delivering up to 100 mA output current with 15 µA typical quiescent current and 0.18 V typical dropout voltage at 50 mA load. It operates across a 3–45 V input range and supports output voltages from 1.5 V to VP via external resistor divider, making it suitable for battery-backed microcontroller power rails in portable and telecom equipment.
For engineers reviewing the TDA3661AT/N1,118 datasheet, TDA3661AT/N1,118 pinout, TDA3661AT/N1,118 application, or TDA3661AT/N1,118 equivalent, key selection criteria include ultra-low Iq under light/no load, reverse polarity tolerance down to −25 V, thermal shutdown at 150 °C, and SO8 package compatibility with high-density PCB layouts.
Technical Context
The TDA3661AT/N1,118 implements a bandgap-referenced feedback loop with adjustable output via ADJ pin, enabling precise regulation across wide input ranges. Its internal thermal protection disables output above 150 °C junction temperature, and its architecture sustains regulation down to ~2 V supply before shutdown.
It features four GND pins tied to the lead frame for enhanced thermal dissipation, reverse-polarity safe operation without external diodes, and built-in short-circuit protection to ground and VP. The regulator maintains stable output with output capacitors ≥1 µF and ESR ≤22 Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 100 mA max - sufficient for MCU core logic, real-time clocks, and sensor biasing without external pass transistor |
| Quiescent current | 15 µA typical at VP = 14.4 V - enables multi-year battery life in always-on backup circuits |
| Dropout voltage | 0.18 V typical at 50 mA - allows regulation from 5.18 V input to 5.0 V output, critical for low-voltage battery systems |
| Input voltage range | 3–45 V - supports wide-range industrial supplies, automotive transients, and telecom line-derived rails |
| Reference voltage | 1.244 V typical - sets precision of adjustable output via external R1/R2 divider (k = 4.01929) |
| Reverse polarity rating | −25 V - eliminates need for input protection diode in battery-reversal-prone applications |
| Thermal shutdown | 150 °C junction - prevents damage during sustained overload or poor heatsinking |
Pinout & Package
Package: SO8 (SOT96-1), plastic small outline, 8-lead, 3.9 mm body width, with exposed lead frame connected to all GND pins for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REG | Regulator output | Delivers regulated voltage; connects to load and output capacitor; requires ≥1 µF low-ESR electrolytic |
| 2, 3, 6, 7 - GND | Ground reference and thermal path | All internally tied to lead frame; must be soldered to large copper pour to reduce Rth(j-a) from 155 K/W to ~50 K/W |
| 4 - n.c. | No connection | Not internally bonded; must remain unconnected on PCB |
| 5 - ADJ | Feedback input | Senses output via resistor divider; enables adjustable VOUT = Vref × (1 + R1/R2) |
| 8 - VP | Supply voltage input | Accepts 3–45 V; includes reverse polarity and transient protection; bypass with C1 recommended |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 15 µA typical ensures <1 µA system standby drain when paired with low-Iq microcontrollers |
| Reverse polarity survival | Withstands −25 V at VP without destructive reverse current - removes need for series blocking diode |
| Integrated thermal protection | Auto-shutdown at Tj > 150 °C prevents latch-up or permanent damage during overloads |
| High transient immunity | Survives 50 V negative transients (100 ms, RS = 10 Ω) - suitable for noisy automotive or industrial environments |
| Output short-circuit safety | DC short-circuit protected to both ground and VP - no external current-limiting required |
Applications
| Portable Medical Sensors | Telecom Line-Powered Devices |
|---|---|
Use Scenario: Powering low-power analog front-ends and BLE transceivers in wearable ECG monitors with coin-cell backup. IC Role / Device Role / Timing Role: Adjustable LDO providing stable 3.3 V rail from variable 3–4.2 V Li-ion battery, maintaining regulation during deep discharge. Use Value: 15 µA Iq extends battery life beyond 3 years in sleep mode; 0.18 V dropout enables usable runtime down to 3.48 V cell voltage. |
Use Scenario: Regulating power for DSL modem PHY ICs powered from −48 V telecom lines via DC/DC converter. IC Role / Device Role / Timing Role: Post-regulator cleaning switching converter ripple and supplying precise 5.0 V to timing-sensitive SerDes blocks. Use Value: 60 dB SVRR at 120 Hz suppresses line-frequency artifacts; reverse polarity rating handles accidental −48 V miswiring. |
| Automotive Body Control Modules | Industrial PLC I/O Isolation Rails |
Use Scenario: Supplying watchdog timers and CAN transceivers in door module ECUs exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Primary 5 V regulator tolerant of −25 V reverse battery connection and 50 V negative transients. Use Value: Eliminates discrete reverse-protection diode and TVS, reducing BOM count and board space while meeting ISO 16750-2 requirements. |
Use Scenario: Generating isolated 3.3 V logic supply for optocoupler inputs in 24 V DC-powered programmable logic controllers. IC Role / Device Role / Timing Role: Low-noise, thermally robust regulator powering digital isolator side, decoupled from noisy 24 V field bus. Use Value: Four GND pins soldered to internal ground plane lower thermal resistance to 50 K/W, enabling full 100 mA output at 85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70733PDQNR | Fixed 3.3 V output; 250 mA rating; 25 µA Iq; SOT-563 package (5-pin) | Not adjustable; higher Iq; smaller package limits thermal performance | Select only if fixed 3.3 V suffices and board space is constrained - no external resistors needed but loses flexibility |
| MCP1703T-5002E/MB | Fixed 5.0 V output; 250 mA; 4 µA Iq; SOT-23-5 package | Lower Iq but fixed output; no reverse polarity rating; lacks thermal shutdown | Prefer for ultra-low-power fixed-rail designs where −25 V reverse stress is absent and thermal margin is adequate |
Compared with TLV70733PDQNR and MCP1703T-5002E/MB, the TDA3661AT/N1,118 uniquely combines adjustability, −25 V reverse tolerance, and integrated thermal protection in SO8 - essential for ruggedized, field-serviceable systems requiring design flexibility and fault resilience.
Availability
TDA3661AT/N1,118 is available at Aetrix Electronics and suitable for portable medical sensors, telecom line-powered devices, and automotive body control modules requiring stable component supply with long lifecycle assurance.
Supply support for TDA3661AT/N1,118 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering analog and power management IP.
The TDA3661AT/N1,118 belongs to NXP's legacy high-reliability linear regulator family, designed specifically for battery-backed and mains-derived systems demanding ultra-low quiescent current, reverse polarity resilience, and thermal robustness.
FAQ
What is the minimum input voltage required for the TDA3661AT/N1,118 to regulate?
The TDA3661AT/N1,118 remains operational down to approximately 2 V supply voltage before switching off. Regulation is guaranteed above 3 V per Quick Reference Data Table 1. Below 2 V, the device enters shutdown to prevent erratic behavior or excessive quiescent current rise - a feature confirmed in Section 7 (Functional Description).
Can the TDA3661AT/N1,118 be used with a fixed 5.0 V output without external resistors?
No - the TDA3661AT/N1,118 is inherently adjustable and requires an external resistor divider between REG, ADJ, and GND to set output voltage. Its reference voltage is 1.244 V typical, so a fixed 5.0 V output demands R1 = 75.1 kΩ and R2 = 24.9 kΩ (k = 4.01929), as shown in Figure 3 of the datasheet.
How does the TDA3661AT/N1,118 handle reverse polarity on the VP pin?
The TDA3661AT/N1,118 is reverse polarity safe down to −25 V at VP with no high reverse current flow, as stated in Section 2 (Features) and Table 4 (Limiting Values). This eliminates the need for an external series diode in battery-powered systems prone to installation errors, unlike standard LDOs that would be destroyed under such conditions.
What is the maximum output capacitance allowed for stable operation of the TDA3661AT/N1,118?
The datasheet specifies C2 ≤ 4700 µF in Section 11.3.1 (Application circuit with backup function). Stability is maintained with electrolytic capacitors ≥1 µF and ESR ≤22 Ω; larger values improve hold-up time but require verification of phase margin, especially below 1 mA load where reduced phase margin is noted.
Does the TDA3661AT/N1,118 support an enable function, and how is it implemented?
Yes - an enable function is supported by pulling the ADJ pin above 1.3 V using an external diode or transistor switch, as detailed in Section 11.3.2 and Figure 4. When enabled, the regulator delivers full output; when disabled, standby current reverts to the 15 µA quiescent level, preserving battery energy in sleep states.
TDA3661AT/N1,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 45V
- Voltage Dropout (Max):
- 0.3V @ 50mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 30 µA
- Current - Supply (Max):
- 2.5 mA
- PSRR:
- 60dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit, Transient Voltage
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TDA3661AT/N1,118 FAQ
1.How can I place an order for TDA3661AT/N1,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA3661AT/N1,118 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 TDA3661AT/N1,118 reliable?
The price and inventory of TDA3661AT/N1,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA3661AT/N1,118 is usually 5 days.
3.What payment methods are accepted for TDA3661AT/N1,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA3661AT/N1,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA3661AT/N1,118?
TDA3661AT/N1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA3661AT/N1,118 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 TDA3661AT/N1,118?
For technical support, including TDA3661AT/N1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA3661AT/N1,118 requirements.
6.How does Aetrix verify that TDA3661AT/N1,118 is sourced from the original manufacturer or authorized distributors?
All TDA3661AT/N1,118 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 TDA3661AT/N1,118 meets industry standards.
7.What is the process for return or replacement of TDA3661AT/N1,118?
All TDA3661AT/N1,118 units undergo pre-shipment inspection (PSI). If there is an issue with TDA3661AT/N1,118, 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 TDA3661AT/N1,118 part is unused and in its original packaging.
Return procedure for TDA3661AT/N1,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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