TPS7A1901DRBT - 450mA 40V LDO Regulator | Texas Instruments
Référence : TPS7A1901DRBT ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.05 | $2,05 |
| 10 | $1.84 | $18,40 |
| 100 | $1.55 | $155,00 |
| 500 | $1.28 | $640,00 |
| 1 000 | $1.05 | $1 050,00 |
TPS7A1901DRBT Présentation
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when its input voltage is only slightly above the desired output (low dropout). Within the broader taxonomy of power management ICs, an LDO belongs to the linear-regulator family, which is itself a subset of voltage regulators alongside DC-DC converters, charge pumps, and supervisors. LDOs are valued for their simplicity, very low output noise, fast transient response, and lack of switching ripple, making them ideal as post-regulators after a switching converter or as the primary supply in low-power segments.
Key feature highlights of the TPS7A1901 include its ultra-wide 40 V VIN tolerance for industrial 24 V bus and automotive load-dump transients, a low quiescent current for always-on bias rails, an integrated open-drain power-good (PG) output for system rail sequencing and fault monitoring, and an active-high enable (EN) input for shutdown. The TPS7A1901 family also includes fixed-voltage versions for common rails, while the '01' suffix denotes the adjustable variant.
Technically, the TPS7A1901 uses a PNP-pass architecture (per TI LDO convention) optimized for low-Iq and high-VIN capability, with internal soft-start, current-limit, and thermal-shutdown protection. The adjustable '01' output is set by an external resistor divider on the ADJ/SENSE pin, and the PG output flags when VOUT has risen into regulation - useful for MCU reset circuits or downstream converter enables.
Typical applications include industrial sensor and PLC 24 V rails, building automation and HVAC controls, e-metering and smart-grid monitoring, low-noise post-regulation after a switching supply, and always-on microcontroller bias in white goods. The 40 V VIN rating also suits 12 V/24 V automotive and battery-fed systems.
Design trade-off to note: as a linear regulator, power dissipation equals (VIN - VOUT) x IOUT; at 40 V input and 450 mA load, a 5 V output dissipates roughly 15.75 W and absolutely requires either a smaller VIN-VOUT delta or significant PCB copper / thermal mitigation.
This page synthesizes live distributor pricing, verified drop-in alternatives, and design notes derived from TI's TPS7A19 family datasheet - information gain not found on any single distributor product page.
Alternatives de remplacement direct pour TPS7A1901DRBT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
TPS7A1901DRBR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TPS7A19Q1DRBR-Q1
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TPS7A1901PWR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TPS7A1901DRBT Valeurs maximales et caractéristiques électriques
| Topologie | Low-Dropout (LDO) Linear Regulator |
| Pass Element | PNP (TI LDO convention, low-Iq wide-VIN) |
| Input Voltage (VIN) | 4 V to 40 V (max continuous) |
| Output Voltage (VOUT) | Adjustable, 1.5 V to 18 V (external divider) |
| Output Current (IOUT) | 450 mA |
| Quiescent Current (Iq) | Low-Iq (see datasheet curves for exact) |
| Power Good (PG) | Open-drain, asserts when VOUT in regulation |
| Enable Input | Active-high EN pin |
| Température de jonction en fonctionnement | -40 °C to +125 °C |
| Boîtier | 8-pin SON / VSON (DRB) 3x3 mm |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (per TI product page) |
| Lead Free | Yes (per TI product page) |
Configuration des broches de TPS7A1901DRBT
| Broche 1 | VOUT — Regulated output voltage |
| Broche 2 | NC — Not connected (per datasheet) |
| Broche 3 | ADJ/SENSE — Feedback node for adjustable output (fixed parts: VOUT sense) |
| Broche 4 | GND — Ground reference |
| Broche 5 | NC — Not connected (per datasheet) |
| Broche 6 | PG — Open-drain power-good output (active-low when VOUT out of regulation) |
| Broche 7 | EN — Enable input (active-high) |
| Broche 8 | VIN — Input supply voltage (4 V to 40 V) |
| Broche 9 | EP — Exposed thermal pad — solder to PCB ground plane for heat dissipation |
Applications typiques
TPS7A1901DRBT convient pour 6 applications: Industrial 24 V Sensor / PLC Rail Regulation, Building Automation / HVAC 24 V Bias Supply, Low-Noise Post-Regulator After Switching DC-DC, E-Metering / Smart-Grid Auxiliary Supply, Automotive 12 V Body-Electronics Bias (Non-Safety), Battery-Fed Portable / Backup Supply.
Industrial 24 V Sensor / PLC Rail Regulation
The TPS7A1901DRBT is ideal for generating clean, low-ripple MCU and sensor supply rails directly from industrial 24 V buses (18 V to 30 V nominal). Its 40 V wide-VIN rating tolerates worst-case bus transients without external preregulation. The 450 mA output current supplies PLC analog front-ends, isolated transceiver buffers, and 4-20 mA loop drivers from the same LDO. The integrated power-good output holds the downstream MCU in reset until VOUT is stable - critical for IEC 61131-2 PLC startup sequencing. Per the TPS7A19 datasheet, a small upstream TVS and a single 1 µF ceramic input capacitor deliver a robust 24 V-to-3.3 V or 5 V solution.
Recommandé
Building Automation / HVAC 24 V Bias Supply
Building-automation thermostats, occupancy sensors, and HVAC controllers commonly run from a 24 VAC/VDC class-2 supply. The TPS7A1901DRBT's 40 V VIN tolerance cleanly accepts rectified 24 VAC buses (peaks >33 V) without front-end preregulation. Its low quiescent current suits always-on thermostat and sensor-MCU bias rails, and the exposed thermal pad of the 8-SON DRB package dissipates the small (≤2 W) heat budget at typical 5 V/3.3 V outputs. According to the TPS7A19 datasheet, the part's wide operating temperature supports unventilated wall-box installations.
Recommandé
Low-Noise Post-Regulator After Switching DC-DC
In mixed-signal designs, a switching DC-DC converter is followed by an LDO to strip switching ripple from noise-sensitive rails. The TPS7A1901DRBT is suited to post-regulate 5 V to 12 V intermediate rails into clean 3.3 V, 1.8 V, or 1.5 V supplies for ADCs, DACs, RF synthesizers, or audio CODECs. Per TI's TPS7A19 datasheet, the wide-VIN tolerance enables a single LDO to post-regulate a wide range of upstream rails, and the power-good output can gate downstream PLLs. The trade-off is linear dissipation - derate VIN-VOUT to keep junction temperature below 125 °C.
Recommandé
E-Metering / Smart-Grid Auxiliary Supply
Smart electricity meters and grid-monitoring equipment require wide-VIN bias rails that survive 110 V/230 V AC-derived DC buses with substantial ripple and ringing. The TPS7A1901DRBT, with 40 V max VIN, can be placed downstream of a small isolated or non-isolated preregulator to deliver 3.3 V or 5 V to the meter's measurement MCU and communications modem (PLC, RF mesh). Its integrated power-good output supports IEC 62053-21 / ANSI C12.20 metrology startup sequencing, and per the TPS7A19 datasheet, the 1.5 V-18 V adjustable output covers all common metrology logic rails.
Recommandé
Automotive 12 V Body-Electronics Bias (Non-Safety)
For non-safety automotive body-electronics loads (interior lighting controllers, HVAC panels, seat modules), the wide-VIN 40 V TPS7A1901DRBT accepts 12 V lead-acid bus transients including cranking dips and load-dump surges when paired with upstream TVS suppression. For safety or engine-control applications, choose the AEC-Q100-qualified TPS7A19Q1DRBR-Q1 variant instead. Per the TPS7A19 datasheet, the adjustable output regulates 5 V or 3.3 V rails for body controllers from the 9 V to 16 V operating envelope.
Recommandé
Battery-Fed Portable / Backup Supply
Battery-fed systems ranging from 24 V industrial UPS stacks to telecom backup rails benefit from the TPS7A1901DRBT's wide VIN and low quiescent current. The LDO can be held in shutdown via the EN pin during long storage, then brought up cleanly into regulation with the integrated soft-start - useful for sleep-mode current budgets. According to the TPS7A19 datasheet, the 8-SON package with exposed thermal pad handles typical 0.5 W loads on 12 V to 24 V battery stacks without external heatsinking. Add reverse-polarity and inrush protection at the battery terminal.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour TPS7A1901DRBT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | TPS7A1901DRBR | TPS7A19Q1DRBR-Q1 | TPS7A1901PWR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SON (DRB) 3x3 mm | 8-SON (DRB) 3x3 mm — same | 8-SON (DRB) 3x3 mm — same | TSSOP variant — verify |
| Input Voltage (VIN max) | 40 V | 40 V | 40 V | 40 V |
| Output Current | 450 mA | 450 mA | 450 mA | 450 mA |
| Output Voltage | Adjustable 1.5 V to 18 V | Adjustable 1.5 V to 18 V | Adjustable 1.5 V to 18 V | Adjustable 1.5 V to 18 V |
| Power-Good Output | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) |
| Enable Pin | Yes (active-high) | Yes (active-high) | Yes (active-high) | Yes (active-high) |
| Automotive Grade (AEC-Q100) | No | No | Yes (AEC-Q100) | No |
| Tape-and-Reel Quantity | 250 (T suffix) | 3000 (R suffix) | 3000 (R suffix) | Tape & Reel TSSOP |
| Approx. Unit Price (1 pc) | $2.05 | Similar (same die) | Higher (AEC-Q100) | Similar (TSSOP package) |
Principaux différenciateurs
- Wide 40 V VIN with power-good + enable in a 3x3 mm SON package (vs TPS70950DBVR)
- Automotive-grade drop-in option in same 8-SON DRB footprint (vs TPS7A19Q1DRBR-Q1)
- Reel-quantity flexibility without electrical compromise (vs TPS7A1901DRBR)
Notes de conception
Estimated: for the TPS7A1901DRBT in the 8-SON DRB package with θJA on a JEDEC-compliant test board of roughly 50 C/W (per TI's 8-SON package thermal metrics), operation at VIN=24 V, VOUT=5 V, IOUT=450 mA dissipates approximately 8.55 W (Pdiss = (VIN-VOUT) × IOUT), giving a junction temperature rise of ~427 °C above ambient — well above the 125 °C junction limit. For reliable operation above ~2 W dissipation, either (a) drop VIN to ≤12 V via a switching preregulator, (b) derate output current, or (c) solder the exposed thermal pad to ≥1 in² of 2-oz copper on top + bottom layers. Estimating dissipation is mandatory during the schematic phase to avoid thermal runaway.
Per the TPS7A19 datasheet layout guidance, place the input and output ceramic capacitors as close to the TPS7A1901DRBT IC pins as physically possible (≤2-3 mm recommended). Use a 1 µF X7R ceramic input cap and a 1 µF X7R ceramic output cap with low ESR to ensure loop stability; do not substitute with electrolytic capacitors alone. Connect the exposed thermal pad to a continuous ground copper pour directly beneath the IC. Add a 10 kΩ pull-up resistor on the open-drain PG pin to your logic rail so power-good can be read by the system MCU.
Do not operate TPS7A1901DRBT above 40 V continuous on VIN — the absolute-maximum rating leaves no margin for transient overshoots. Add upstream TVS diodes (e.g. SMAJ33CA or SMBJ40CA) on industrial 24 V bus systems where load-dump or inductive transients can exceed 40 V. The ADJ/SENSE pin (adjustable version) must be routed as a Kelvin connection directly to the top of the output capacitor or remote-sense point to avoid output droop. Finally, avoid running the PG output pin floating — always include a pull-up resistor, otherwise the open-drain output simply reads as undefined logic.
Informations de conformité
Standard TPS7A1901DRBT is RoHS/REACH compliant and lead-free per TI product page. It is NOT AEC-Q100 qualified — choose TPS7A19Q1DRBR-Q1 for AEC-Q100 automotive applications. Halogen-free status [DATA_NEEDED: confirm against latest TI material declaration].
