My Inquiry
My Account
Texas Instruments REF5045AQDRQ1
- Part No.:
- REF5045AQDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF5045AQDRQ1.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,507
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
REF5045AQDRQ1 from Texas Instruments is an automotive-grade, low-noise, very-low-drift precision voltage reference delivering 4.5 V output with ±0.1% initial accuracy, 3 ppm/°C typical temperature drift, and 13.5 µVPP (0.1–10 Hz) output noise. It sources/sinks ±10 mA and operates from –40°C to +125°C, serving as the primary reference in high-resolution ADCs for automotive sensor signal conditioning.
For engineers reviewing the REF5045AQDRQ1 datasheet, REF5045AQDRQ1 pinout, REF5045AQDRQ1 application, or REF5045AQDRQ1 equivalent, this page delivers verified electrical specs, SOIC-8 pin mapping, automotive-qualified thermal stability data, and validated alternatives for ATE, medical instrumentation, and precision industrial control designs.
Technical Context
The REF5045AQDRQ1 implements a proprietary precision bandgap core with internal trimming and noise-reduction architecture. Its TRIM/NR pin enables ±15 mV output adjustment and supports external capacitor filtering (1 µF recommended) to suppress broadband noise.
It features dual monitoring paths: VOUT provides stable 4.5 V reference with <8 ppm/°C max drift, while the TEMP pin delivers a 2.64 mV/°C analog temperature signal (575 mV at 25°C) for on-chip thermal awareness-buffering required for accurate measurement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.5 V nominal; fixed value enabling direct interface with 16-bit SAR ADCs requiring 4.5 V reference (e.g., ADS8326). |
| Initial Accuracy | ±0.1% max at 25°C; ensures ≤4.5 mV absolute error without calibration in production test systems. |
| Temp Drift | 3 ppm/°C typical, 8 ppm/°C max over –40°C to +125°C; contributes ≤0.0036 V error across full automotive temperature range. |
| Output Noise | 13.5 µVPP (0.1–10 Hz); limits effective resolution to ≤19.5 bits in low-frequency precision acquisition. |
| HBM ESD Rating | ±1000 V per AEC Q100-002; qualifies for handling in automotive manufacturing environments without special ESD controls. |
| Supply Range | VIN ≥ VOUT + 0.2 V (min 4.7 V); enables ultra-low dropout operation in battery-supplied modules with tight headroom. |
| Load Current | ±10 mA sourcing/sinking capability; supports driving multiple ADC references or op-amp bias networks without external buffers. |
Pinout & Package
REF5045AQDRQ1 is housed in an 8-pin SOIC (D package), RoHS-compliant and qualified to AEC-Q100 Grade 1. Thermal resistance RθJA = 107.1°C/W enables operation up to +125°C ambient with moderate power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DNC) | Do not connect | Unused pad; must remain floating-no trace or solder connection permitted. |
| 2 (VIN) | Input supply | Accepts 4.7 V to 18 V; dropout as low as 200 mV enables use in 5 V systems with minimal regulation overhead. |
| 3 (TEMP) | Temperature monitor output | Provides 575 mV @ 25°C, 2.64 mV/°C slope; requires op-amp buffer (e.g., OPA333) before ADC sampling. |
| 4 (GND) | Analog ground | Primary return path for reference current; must be connected to clean analog ground plane, separate from digital GND. |
| 5 (TRIM/NR) | Trim & noise reduction | Enables ±15 mV VOUT adjustment or 1 µF capacitor attachment for 14.5 Hz low-pass noise filtering. |
| 6 (VOUT) | Precision reference output | Delivers regulated 4.5 V ±0.1%; requires 1–50 µF low-ESR ceramic capacitor to GND for stability. |
| 7 (NC) | No internal connection | Floating terminal; no internal bond wire-must not be tied to any net. |
| 8 (DNC) | Do not connect | Unused pad; identical to Pin 1-leave unconnected and unmasked in layout. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C), HBM ±1000 V-certified for engine control, ADAS, and body electronics. |
| Low long-term drift | 90 ppm/1000 hr typical after first 1000 hours-enables 10+ year field reliability in sealed automotive modules. |
| Thermal hysteresis | 10 ppm max after –40°C/+125°C cycling-critical for repeatable calibration in reflow-soldered ECUs. |
| High PSRR | >60 dB at 1 kHz (Figure 5)-rejects switching noise from DC/DC converters powering adjacent microcontrollers. |
| Turn-on settling | 200 µs to 0.1% with 1 µF load-supports fast wake-up in low-power automotive subsystems. |
Applications
| Automotive Sensor Signal Conditioning | 16-Bit Automotive Data Acquisition |
|---|---|
|
Use Scenario: Front radar module digitizing Doppler-shifted IF signals using a 16-bit SAR ADC under varying under-hood temperatures. IC Role / Device Role / Timing Role: Provides 4.5 V reference for ADS8326 ADC, directly setting full-scale input range and LSB size. Use Value: 3 ppm/°C drift ensures ≤0.0036 V reference error across –40°C to +125°C, preserving 16-bit linearity without recalibration. |
Use Scenario: Battery management system measuring cell voltages with 16-bit resolution across 96-cell packs. IC Role / Device Role / Timing Role: Supplies stable 4.5 V reference to multiplexed ADC front-end, enabling precise differential voltage measurements. Use Value: ±10 mA drive capability powers ADC reference inputs and anti-aliasing filter op-amps without external buffers. |
| Medical Patient Monitoring | Industrial Process Control Loop |
|
Use Scenario: Portable ECG device acquiring microvolt-level biopotentials with 16-bit resolution in hospital and ambulance settings. IC Role / Device Role / Timing Role: Reference source for sigma-delta ADC, defining quantization step and common-mode rejection performance. Use Value: 13.5 µVPP (0.1–10 Hz) noise floor enables detection of sub-µV cardiac waveforms without oversampling penalty. |
Use Scenario: PLC analog I/O module converting 4–20 mA loop signals to digital values for closed-loop valve control in chemical plants. IC Role / Device Role / Timing Role: Precision reference for isolated ADC channel, ensuring traceable metrology-grade accuracy per IEC 61000-4-30. Use Value: ±0.1% initial accuracy and 50 ppm/mA load regulation guarantee ≤0.5 mV error despite varying sensor excitation loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5040A-Q1 | 4.096 V output, same SOIC-8 package, identical drift/noise specs, but 0.1% initial accuracy applies to 4.096 V point. | Used where 4.096 V aligns with 12-/16-bit ADC full-scale (e.g., 212 × 1 mV), not 4.5 V systems. | Select when matching legacy 4.096 V reference designs or optimizing for binary-aligned ADC codes. |
| ADR4545B | 4.5 V output, SOIC-8, ±0.02% initial accuracy (tighter), but 12 ppm/°C max drift and higher 3.75 µVRMS noise. | Suitable for lab-grade instrumentation needing tighter initial tolerance, less ideal for wide-temp automotive use. | Choose for benchtop test equipment where initial accuracy dominates over thermal stability. |
Compared with REF5045AQDRQ1, REF5040A-Q1 offers identical performance at 4.096 V for binary-aligned systems, while ADR4545B trades lower initial error for higher drift and noise-making REF5045AQDRQ1 optimal for automotive and industrial applications demanding consistent accuracy across temperature extremes.
Availability
REF5045AQDRQ1 is available at Aetrix Electronics and suitable for automotive sensor signal conditioning, 16-bit data acquisition systems, and medical patient monitoring requiring stable component supply with AEC-Q100 compliance and long-term parametric consistency.
Supply support for REF5045AQDRQ1 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 leader specializing in analog and embedded processing technologies, with decades of automotive IC design expertise and rigorous AEC-Q100 qualification infrastructure.
The REF50xxA-Q1 product line was engineered specifically for high-precision, high-reliability automotive applications-including ADAS, powertrain, and body electronics-where low drift, low noise, and long-term stability are non-negotiable.
FAQ
What is the maximum operating temperature for REF5045AQDRQ1?
The REF5045AQDRQ1 is rated for continuous operation from –40°C to +125°C ambient, meeting AEC-Q100 Grade 1 requirements. Its junction temperature must not exceed 150°C; with RθJA = 107.1°C/W and typical quiescent current of 1.2 mA, it remains within safe thermal limits even at maximum ambient when delivering ≤5 mA load current. REF5045AQDRQ1's thermal hysteresis is characterized across this full range.
Does REF5045AQDRQ1 support negative reference generation?
REF5045AQDRQ1 itself provides only a positive 4.5 V reference output and cannot generate negative voltages directly. However, as shown in TI's SBOS456H Figure 31, REF5045AQDRQ1 can be paired with a precision zero-drift op amp like OPA735 to create a buffered negative reference-though the OPA735 must be powered from split supplies. REF5045AQDRQ1 remains the stable positive rail source in such configurations.
Can the TRIM/NR pin of REF5045AQDRQ1 be left unconnected?
Yes-the TRIM/NR pin (Pin 5) may be left floating if no output adjustment or noise filtering is required. However, TI recommends connecting a 1 µF capacitor from TRIM/NR to GND to reduce broadband noise by ~10 dB, especially in noisy automotive environments. Leaving it unconnected does not affect REF5045AQDRQ1's basic functionality or accuracy specifications.
What is the purpose of the TEMP pin on REF5045AQDRQ1?
REF5045AQDRQ1's TEMP pin (Pin 3) outputs a voltage proportional to die temperature: 575 mV at 25°C with 2.64 mV/°C slope. It is intended for coarse thermal monitoring-not precision measurement-and requires buffering (e.g., with OPA333) due to its ~60 kΩ output impedance. Loading it directly degrades accuracy but does not affect REF5045AQDRQ1's VOUT stability.
Is REF5045AQDRQ1 pin-compatible with other REF50xxA-Q1 variants?
Yes-REF5045AQDRQ1 shares identical SOIC-8 (D package) pinout, electrical behavior, and thermal characteristics with all REF50xxA-Q1 family members (e.g., REF5040A-Q1, REF5050A-Q1). The only functional difference is the nominal output voltage (4.5 V), making it a direct drop-in replacement where 4.5 V reference is required, with no PCB or firmware changes needed.
REF5045AQDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 8ppm/°C
- Noise - 0.1Hz to 10Hz:
- 13.5µVpp/V
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.7V ~ 18V
- Current - Supply:
- 1.2mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF5045AQDRQ1 FAQ
1.How can I place an order for REF5045AQDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF5045AQDRQ1 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 REF5045AQDRQ1 reliable?
The price and inventory of REF5045AQDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF5045AQDRQ1 is usually 5 days.
3.What payment methods are accepted for REF5045AQDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF5045AQDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF5045AQDRQ1?
REF5045AQDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF5045AQDRQ1 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 REF5045AQDRQ1?
For technical support, including REF5045AQDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF5045AQDRQ1 requirements.
6.How does Aetrix verify that REF5045AQDRQ1 is sourced from the original manufacturer or authorized distributors?
All REF5045AQDRQ1 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 REF5045AQDRQ1 meets industry standards.
7.What is the process for return or replacement of REF5045AQDRQ1?
All REF5045AQDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF5045AQDRQ1, 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 REF5045AQDRQ1 part is unused and in its original packaging.
Return procedure for REF5045AQDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF5045AQDRQ1 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…
