Specifications
| Type | Description |
|---|---|
| Part Number | NCP1027 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | PDIP-8, 8-lead PDIP, Case 626A |
| Component Type | Power_IC |
| Integrated MOSFET breakdown voltage | 700 V; Power switch circuit and startup, ID(off)=120 uA, TJ=25°C |
| Integrated MOSFET on-state resistance | 5.8 ohm typ, 7.0 ohm max; Id=100 mA, TJ=25°C |
| Integrated MOSFET on-state resistance | 9.8 ohm typ, 11 ohm max; Id=100 mA, TJ=125°C |
| Drain voltage maximum rating | -0.3 to 700 V; Pin 5 drain |
| Drain peak current maximum rating | 1.8 A; During transformer saturation |
| VCC operating start threshold | 7.9 V min, 8.5 V typ, 8.9 V max; VCC increasing level at which switcher starts |
| VCC stop threshold | 6.7 V min, 7.2 V typ, 7.9 V max; VCC decreasing level at which switcher stops operation |
| VCC UVLO hysteresis | 1.2 V typ; Between VCCON and VCC(min) |
| Internal clamp activation offset | 140 mV min, 200 mV typ, 300 mV max; Above VCCON |
| VCC latch reset voltage | 4.0 V typ; Internal latch reset threshold |
| Internal IC consumption | 1.4 mA typ, 1.9 mA max; MOSFET switching at 65 kHz or 100 kHz, VCC=8.0 V |
| High-voltage startup current source | 3.5 mA min, 6.0 mA typ, 8.0 mA max; VCC=VCCON - 200 mV |
| High-voltage startup current source | 350 uA min, 650 uA typ, 900 uA max; VCC=0 V |
| Startup current source transition level | 1.3 V typ; VCC transition level for IC1 to IC2 toggling point |
| Maximum internal current setpoint | 720 mA min, 800 mA typ, 880 mA max; Pin 4 open, TJ=25°C, FSW=65 kHz |
| Final switch current | 820 mA typ; Primary slope=200 mA/us, FSW=65 kHz |
| Maximum internal current setpoint | 720 mA min, 800 mA typ, 880 mA max; Pin 4 open, TJ=25°C, FSW=100 kHz |
| Final switch current | 820 mA typ; Primary slope=200 mA/us, FSW=100 kHz |
| OPP setpoint decrease | 23% typ; Pin 7 injected current=40 uA, TJ=25°C |
| OPP operating threshold | 1.5 V typ; Pin 7 voltage level at which OPP starts to operate |
| Soft-start duration | 1.0 ms typ; Startup operation |
| Current detection propagation delay | 100 ns typ; From current detection to drain OFF state |
| Leading edge blanking duration | 200 ns typ; Current comparator blanking |
| Oscillation frequency | 58.5 kHz min, 65 kHz typ, 71.5 kHz max; 65 kHz version, TJ=25°C, jittering disabled |
| Oscillation frequency | 90 kHz min, 100 kHz typ, 110 kHz max; 100 kHz version, TJ=25°C, jittering disabled |
| Frequency jittering | +/-6.0% typ of fOSC; Internal oscillator |
| Jittering swing frequency | 300 Hz typ; Internal oscillator |
| Maximum duty cycle | 74% min, 80% typ, 87% max; Extended duty cycle operation |
| Feedback pullup resistor | 16 kohm typ; Pin 4 feedback section |
| Ramp compensation level | 2.75 V typ; Pin 1, Rramp=100 kohm |
| Skip mode threshold | 25% typ; Percentage of maximum peak current |
| Brown-out level | 510 mV min, 570 mV typ, 620 mV max; Pin 3 brown-out input |
| Brown-out hysteresis current | 10 uA min, 11.5 uA typ, 13 uA max; TJ=25°C |
| Brown-out hysteresis current | 10 uA typ; TJ=0°C to 125°C |
| Fault validation time | 40 ms min, 55 ms typ; Further to error flag assertion |
| Fault mode OFF phase | 440 ms typ; Timer-based fault mode |
| Brown-out pin latching voltage | 3.15 V min, 3.5 V typ, 3.85 V max; Pin 3 latch input |
| Latch input filter time constant | 20 us typ; Brown-out/latch input integrating filter |
| OVP filter time constant | 50 us typ; OVP integrating filter |
| OVP stop-pulsing current | 6.0 mA min, 8.5 mA typ, 11 mA max; VCC current at which switcher stops pulsing |
| Thermal shutdown temperature | 160°C min; Temperature management |
| Thermal shutdown hysteresis | 40°C typ; Temperature management |
| Junction-to-air thermal resistance | 100°C/W; PDIP7 package |
| Junction-to-air thermal resistance with copper area | 75°C/W; PDIP7 with 1.0 cm^2 of 35 um copper area |
| Maximum junction temperature | 150°C; Absolute maximum rating |
| Storage temperature range | -60°C to +150°C; Absolute maximum rating |
| No-load standby input power | 85 mW; 265 Vac input |
| Loaded input power | 715 mW; 230 Vac input, 500 mW loaded |
| Typical output power | 25 W; 230 Vac, open-frame, 65 kHz version, RthetaJA < 75°C/W, TA=50°C |
| Typical output power | 15 W; 90-265 Vac, open-frame, 65 kHz version, RthetaJA < 75°C/W, TA=50°C |
| Datasheet Status | request_only |
Product Overview
The NCP1027 is a Texas Instruments Power_Management IC described as a high-voltage offline SMPS switcher. It integrates a 700 V power switch and startup circuit, with drain voltage rated from -0.3 to 700 V and drain peak current rated at 1.8 A during transformer saturation. The package is PDIP-8, 8-lead PDIP, Case 626A, with junction-to-air thermal resistance specified as 100°C/W, or 75°C/W with 1.0 cm^2 of 35 um copper area.
Control and protection functions are defined by VCC thresholds, current setpoint behavior, oscillator frequency, duty cycle, brown-out input, latch input, OVP, and thermal shutdown parameters. The device starts at 8.5 V typical VCC and stops at 7.2 V typical, with 1.2 V typical UVLO hysteresis. Oscillator options are 65 kHz typical or 100 kHz typical, both with ±6.0% typical jittering.
Application context from the datasheet facts includes offline SMPS designs, open-frame supplies, 230 Vac input supplies, and universal 90-265 Vac input supplies. The extracted output-power conditions reference 25 W at 230 Vac and 15 W from 90-265 Vac at TA=50°C with RthetaJA below 75°C/W.
Key Features
- Integrated 700 V MOSFET power switch and startup circuit
- 5.8 ohm typical MOSFET on-resistance at 25°C
- 65 kHz and 100 kHz oscillator versions specified
- +/-6.0% typical oscillator frequency jittering
- 1.0 ms typical soft-start during startup operation
- 100 ns typical current detection propagation delay
- 200 ns typical leading edge blanking duration
- 80% typical maximum duty cycle operation
- 570 mV typical brown-out input level
- 160°C minimum thermal shutdown temperature
Typical Applications
- Offline SMPS converters
- Open-frame power supplies
- 230 Vac input supplies
- 90-265 Vac universal input supplies
- Low no-load standby designs
- Brown-out monitored power supplies
- 25 W 230 Vac open-frame supplies
- 15 W universal-input open-frame supplies
Procurement Notes
When requesting a quote for NCP1027, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What type of power IC is the NCP1027?
The NCP1027 is identified as a high-voltage offline SMPS switcher in the Power_Management category. It integrates a 700 V MOSFET power switch and startup circuit in a PDIP-8, 8-lead PDIP, Case 626A package.
What oscillator options are specified for the NCP1027?
The extracted facts list two oscillator versions: 65 kHz typical with a 58.5 kHz to 71.5 kHz range, and 100 kHz typical with a 90 kHz to 110 kHz range, both at TJ=25°C with jittering disabled.
What VCC thresholds control startup and stopping?
The switcher starts when VCC rises to 8.5 V typical, with 7.9 V minimum and 8.9 V maximum limits. It stops operation when VCC falls to 7.2 V typical, with 6.7 V minimum and 7.9 V maximum limits.
What package and thermal values are provided?
The package is listed as PDIP-8, 8-lead PDIP, Case 626A. Thermal facts include 100°C/W junction-to-air resistance, 75°C/W with 1.0 cm^2 of 35 um copper area, and 150°C maximum junction temperature.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 26, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.