My Inquiry
My Account
Texas Instruments REF3450SQDBVRQ1
- Part No.:
- REF3450SQDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
REF3450SQDBVRQ1.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,453
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
REF3450SQDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to +125°C) precision CMOS voltage reference delivering 5.0 V output with ±0.05% initial accuracy, 6 ppm/°C max temperature coefficient, 3.8 µVPP/V low-frequency noise (0.1 Hz–10 Hz), ±10 mA output current capability, and 95 µA max quiescent current - used in high-resolution ADC biasing for automotive battery management systems.
For engineers reviewing the REF3450SQDBVRQ1 datasheet, REF3450SQDBVRQ1 pinout, REF3450SQDBVRQ1 application, or REF3450SQDBVRQ1 equivalent, key selection criteria include automotive-grade thermal stability, enable-controlled shutdown (3 µA), force-sense output architecture, and SOT-23-6 package compatibility with space-constrained EV powertrain modules.
Technical Context
The REF3450SQDBVRQ1 implements a precision bandgap core with buffered force-sense output topology to separate load regulation error from sensing path, enabling <70 ppm/mA sinking load regulation at 5.0 V. Its enable pin controls active/shutdown modes with 1.6 V logic-high threshold and 0.5 V logic-low threshold.
It operates across 5.05 V to 12 V input range (50 mV dropout at zero load), supports 0.1 µF–10 µF output capacitance, and achieves 25 ppm/1000 hrs long-term stability in the DBV (SOT-23-6) package - validated per AEC-Q100 with HBM ±2500 V and CDM ±1500 V ESD ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V nominal - provides stable reference for 16-bit+ SAR and delta-sigma ADCs in traction inverter current sensing. |
| Initial Accuracy | ±0.05% max - eliminates need for system-level calibration in BMS cell voltage monitoring. |
| Temp Coefficient | 6 ppm/°C max - ensures ≤0.75 mV drift over −40°C to +125°C ambient, critical for ASIL-B timing-critical subsystems. |
| Quiescent Current | 95 µA max - enables >10-year battery life in always-on vehicle wake-up circuits. |
| Noise (0.1–10 Hz) | 3.8 µVPP/V - maintains SNR >108 dB for 24-bit ADCs in ADAS radar signal chains. |
| Shutdown Current | 3 µA max - reduces standby power in OBC pre-charge sequencing without external switches. |
| Load Current | ±10 mA - drives multiple ADC reference inputs or op-amp bias networks simultaneously. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND_F | Force ground | Low-impedance return path for output current - must connect directly to power ground plane to minimize load regulation error. |
| GND_S | Sense ground | High-impedance reference return - routed separately to ADC ground to reject PCB trace IR drop. |
| EN | Enable control | Active-high digital input; pulls device into 3 µA shutdown when ≤0.5 V - compatible with 3.3 V MCU GPIO. |
| OUT_F | Force output | Delivers regulated 5.0 V to load; connects to ADC VREF+ or op-amp non-inverting input. |
| IN | Supply input | Accepts 5.05–12 V; requires ≥0.1 µF ceramic bypass capacitor placed within 2 mm of pin. |
| OUT_S | Sense output | Feedback node for internal amplifier - ties to ADC VREF− or reference buffer input to close regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation - meets functional safety requirements for body control and powertrain ECUs. |
| Force-sense output architecture | Separates output drive (OUT_F/GND_F) from feedback (OUT_S/GND_S) - eliminates PCB trace resistance impact on reference accuracy. |
| Low 1/f noise | 3.8 µVPP/V (0.1–10 Hz) - preserves dynamic range in slow-sampling BMS voltage acquisition (<1 kSPS). |
| Thermal hysteresis | 30 ppm max (Cycle 1, DBV) - ensures repeatable voltage after thermal cycling in under-hood environments. |
| Long-term stability | 25 ppm/1000 hrs - minimizes calibration drift in field-deployed EV chargers over 5+ year service life. |
Applications
| Body Control Module | Battery Management System |
|---|---|
Use Scenario: Monitoring 12 V auxiliary battery voltage and cabin sensor rails in automotive BCMs. IC Role / Device Role / Timing Role: Provides stable 5.0 V reference for multi-channel 12-bit ADCs sampling door lock status, HVAC thermistors, and lighting drivers. Use Value: ±0.05% accuracy eliminates per-unit calibration; 6 ppm/°C drift ensures consistent readings across engine bay temperature swings. |
Use Scenario: Cell voltage measurement in high-voltage EV battery packs (up to 900 V). IC Role / Device Role / Timing Role: Supplies precision 5.0 V reference to isolated sigma-delta ADCs (e.g., AMC1306) in modular BMS slave boards. Use Value: Force-sense architecture rejects PCB voltage drop in high-current stack monitoring; 3.8 µVPP/V noise enables <0.1% SOC estimation error. |
| On-Board Charger | Traction Inverter |
Use Scenario: Voltage and current sensing during AC/DC conversion in 11 kW OBCs. IC Role / Device Role / Timing Role: References isolated shunt amplifiers and ADCs measuring grid-side AC input and DC-link voltage. Use Value: 12 V input tolerance accommodates unregulated auxiliary supplies; shutdown mode (3 µA) cuts standby loss during vehicle sleep. |
Use Scenario: Gate driver bias and current sense reference in IGBT/SiC inverter stages. IC Role / Device Role / Timing Role: Supplies 5.0 V to isolated gate driver ICs (e.g., UCC5870-Q1) and current-sense amplifiers feeding motor control FPGAs. Use Value: AEC-Q100 qualification ensures reliability under high EMI and thermal stress; ±10 mA drive supports parallel reference distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3450QDBVRQ1 | Same 5.0 V output, ±0.05% accuracy, and 6 ppm/°C drift, but uses standard SOT-23-6 (no force-sense pins); lacks OUT_S/GND_S terminals. | Lower-cost option where PCB layout allows single-point ground and trace resistance is negligible (<10 mΩ). | Select REF3450QDBVRQ1 only if system-level load regulation error budget permits omission of force-sense architecture. |
| MAX6070BAUT50+T | 5.0 V output, ±0.04% initial accuracy, 3 ppm/°C drift, but no enable pin and 12 µA quiescent current; SOT-23-5 package. | Preferred for ultra-low-drift applications where shutdown functionality is unnecessary and supply current is not constrained. | Choose MAX6070BAUT50+T when drift performance dominates over power savings and enable control. |
Compared with REF3450SQDBVRQ1, REF3450QDBVRQ1 removes force-sense capability for cost reduction while retaining core specs, whereas MAX6070BAUT50+T trades enable functionality and higher quiescent current for superior drift - making REF3450SQDBVRQ1 optimal for automotive systems requiring both precision and intelligent power management.
Availability
REF3450SQDBVRQ1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and on-board chargers requiring stable component supply under AEC-Q100 automotive qualification.
Supply support for REF3450SQDBVRQ1 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.
The REF34-Q1 product line delivers AEC-Q100 qualified voltage references optimized for high-accuracy, low-noise, and low-power operation in automotive powertrain and ADAS subsystems.
FAQ
What is the maximum input voltage for REF3450SQDBVRQ1?
The REF3450SQDBVRQ1 supports a maximum input voltage of 12 V, with absolute maximum rating of 13 V. Operation above 12 V risks exceeding thermal limits and violating recommended operating conditions - sustained use beyond 12 V may degrade long-term stability or cause permanent damage.
Does REF3450SQDBVRQ1 require external capacitors?
Yes, REF3450SQDBVRQ1 requires a minimum 0.1 µF ceramic capacitor on the IN pin and supports 0.1 µF–10 µF on the OUT_F pin. The datasheet specifies 10 µF for optimal noise and transient performance. Omitting these capacitors causes instability, increased noise, and potential oscillation.
How does the force-sense architecture of REF3450SQDBVRQ1 improve accuracy?
The REF3450SQDBVRQ1 uses separate OUT_F/GND_F (force) and OUT_S/GND_S (sense) terminals to isolate regulation feedback from load current paths. This eliminates voltage drop errors caused by PCB trace resistance, maintaining ±0.05% accuracy even with 100 mΩ ground path impedance - critical for high-current automotive modules.
What is the typical turn-on time for REF3450SQDBVRQ1?
The REF3450SQDBVRQ1 has a typical turn-on time of 2.5 ms to settle within 0.1% of final 5.0 V output when CL = 10 µF. This value is measured from EN rising edge to output stabilization and is confirmed across −40°C to +125°C - essential for fast-wake applications like ADAS camera power sequencing.
Is REF3450SQDBVRQ1 pin-compatible with other REF34-Q1 variants?
No, REF3450SQDBVRQ1 (SOT-23-6 force-sense) is not pin-compatible with REF3450QDBVRQ1 (SOT-23-6 standard) or REF3450SDBVRQ1 (SOT-23-5). Pin functions differ significantly - especially GND_F/GND_S/OUT_F/OUT_S assignments - requiring unique PCB layout and schematic symbol for REF3450SQDBVRQ1.
REF3450SQDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 6ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3.8µVp-p
- Noise - 10Hz to 10kHz:
- 24µVrms
- Voltage - Input:
- 5.5V ~ 12V
- Current - Supply:
- 95µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
REF3450SQDBVRQ1 FAQ
1.How can I place an order for REF3450SQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3450SQDBVRQ1 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 REF3450SQDBVRQ1 reliable?
The price and inventory of REF3450SQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3450SQDBVRQ1 is usually 5 days.
3.What payment methods are accepted for REF3450SQDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3450SQDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3450SQDBVRQ1?
REF3450SQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3450SQDBVRQ1 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 REF3450SQDBVRQ1?
For technical support, including REF3450SQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3450SQDBVRQ1 requirements.
6.How does Aetrix verify that REF3450SQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3450SQDBVRQ1 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 REF3450SQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of REF3450SQDBVRQ1?
All REF3450SQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3450SQDBVRQ1, 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 REF3450SQDBVRQ1 part is unused and in its original packaging.
Return procedure for REF3450SQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3450SQDBVRQ1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
