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Texas Instruments REF2033QDDCRQ1
- Part No.:
- REF2033QDDCRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
REF2033QDDCRQ1.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,740
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Product details
Overview
REF2033QDDCRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified dual-output voltage reference IC delivering precise VREF = 3.3 V and VBIAS = 1.65 V outputs for automotive signal conditioning. It achieves ±0.05% initial accuracy, 8 ppm/°C max temperature drift over –40°C to +125°C, ±20 mA output current capability, and 10 mV dropout voltage - enabling high-precision ADC biasing in battery-powered telematics and motor control systems.
For engineers reviewing the REF2033QDDCRQ1 datasheet, REF2033QDDCRQ1 pinout, REF2033QDDCRQ1 application, or REF2033QDDCRQ1 equivalent, key selection criteria include dual-rail tracking performance (7 ppm/°C max VREF–2×VBIAS drift), functional safety documentation support, SOT23-5 micro-package compatibility with automotive thermal constraints, and low-quiescent-current operation (360 µA) under wide-input-voltage conditions.
Technical Context
The REF2033QDDCRQ1 integrates a precision band-gap core with two independent e-Trim™-calibrated buffers to generate VREF and VBIAS (VREF/2) from a shared reference node, ensuring matched temperature coefficients and long-term stability. Its architecture enables simultaneous sourcing and sinking on both outputs without performance degradation.
It operates across –40°C to +125°C ambient with AEC-Q100 qualification, HBM ±2500 V / CDM ±1500 V ESD robustness, and functional safety documentation support. Enable logic (EN ≥ VIN – 0.7 V) provides active-high shutdown mode reducing quiescent current to 5 µA while placing outputs in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Output | 3.3 V ±0.05% - stable primary reference for 12-bit+ ADCs in automotive gateways and BMS |
| VBIAS Output | 1.65 V ±0.05% - exact half-scale bias for bipolar signal conditioning in single-supply sensor interfaces |
| Temp Drift (VREF/VBIAS) | ±8 ppm/°C max (–40°C to +125°C) - ensures < ±0.01% full-scale error over full automotive temperature range |
| VREF–2×VBIAS Tracking | ±7 ppm/°C max - guarantees sub-0.005% matching drift between outputs for differential measurement integrity |
| Quiescent Current | 360 µA typ - enables always-on monitoring in low-power domains without compromising accuracy |
| Dropout Voltage | 10 mV at 20 mA - supports operation down to VIN = 3.31 V, critical for degraded battery conditions in OBCs |
| Output Current | ±20 mA per output - drives multiple ADC references or op-amp bias networks without external buffering |
Pinout & Package
SOT23-5 package (2.90 mm × 1.60 mm body size) with exposed pad not electrically connected; optimized for high-density automotive PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 1) | Output | High-accuracy 1.65 V bias voltage; sinks/sources ±20 mA; tracks VREF within ±7 ppm/°C |
| GND (Pin 2) | Reference | Analog ground return for both outputs; requires low-impedance connection to minimize noise coupling |
| EN (Pin 3) | Input | Enable control: device active when EN ≥ VIN – 0.7 V; high-impedance shutdown below 0.7 V |
| VIN (Pin 4) | Input | Supply input: operates from VREF + 0.02 V (3.32 V min) to 5.5 V; rejects supply ripple via 80 dB PSRR at 100 Hz |
| VREF (Pin 5) | Output | Primary 3.3 V reference; identical accuracy/drift specs as VBIAS; used for ADC VREF and system calibration |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output tracking | VREF and VBIAS maintain ≤ ±7 ppm/°C relative drift - eliminates need for separate trimming in differential signal chains |
| e-Trim™ calibration | Post-mold package-level trimming of both outputs - minimizes die stress-induced errors and achieves ±0.05% initial accuracy |
| Low-noise performance | 12 ppmPP (0.1–10 Hz), 0.25 ppm/√Hz noise density - preserves SNR in high-resolution data acquisition |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C), HBM Class 2, CDM Class C7B - validated for under-hood and powertrain environments |
| Functional safety support | Documentation available for ISO 26262 ASIL-B system integration - includes FIT rate, failure modes, and diagnostic coverage guidance |
Applications
| Telematics Control Unit | Battery Management System |
|---|---|
Use Scenario: High-accuracy cell voltage monitoring and pack isolation detection in 48 V mild-hybrid BMS. IC Role / Device Role / Timing Role: Provides VREF for 16-bit SAR ADC and VBIAS for differential front-end amplifiers measuring ±50 mV sense voltages. Use Value: Dual-output tracking ensures consistent common-mode rejection across temperature, reducing calibration frequency and improving SoC estimation accuracy by >0.3%. |
Use Scenario: Signal conditioning for current-sense shunts in traction inverter DC-link monitoring. IC Role / Device Role / Timing Role: Supplies matched reference and bias rails to isolated delta-sigma modulators sampling bidirectional motor currents up to ±500 A. Use Value: 10 mV dropout enables operation during low-battery cranking events (VIN ≈ 3.35 V), maintaining measurement continuity without brownout resets. |
| On-Board Charger | Power Steering ECU |
Use Scenario: Precision voltage and current regulation feedback in bi-directional AC/DC converters. IC Role / Device Role / Timing Role: Delivers stable 3.3 V reference for PWM controller ADCs and 1.65 V bias for op-amps driving isolated gate drivers. Use Value: ±20 mA drive strength eliminates external buffers, reducing BOM count and layout area in space-constrained OBC modules. |
Use Scenario: Torque sensor signal conditioning and motor phase current sensing in EPS systems. IC Role / Device Role / Timing Role: Generates synchronized VREF/VBIAS for dual-channel 12-bit ADCs acquiring analog torque and position signals. Use Value: 360 µA quiescent current meets ISO 16750-2 sleep-mode requirements while preserving fast wake-up (<500 µs turn-on time). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF2030QDDCRQ1 | VREF = 3.0 V, VBIAS = 1.5 V; otherwise identical specs and pinout | Requires redesign of ADC full-scale range and bias network scaling; suitable where 3.0 V system rail dominates | Select when existing 3.0 V reference architecture must be preserved without changing gain stages |
| REF2025QDDCRQ1 | VREF = 2.5 V, VBIAS = 1.25 V; same accuracy, drift, and package | Lower output voltage reduces noise margin in noisy EPS environments; may require higher-gain front-end amplification | Prefer for legacy 2.5 V ADC designs or cost-sensitive applications where lower voltage simplifies LDO selection |
Compared with REF2030QDDCRQ1 and REF2025QDDCRQ1, the REF2033QDDCRQ1 offers optimal headroom for 3.3 V microcontrollers and improved SNR in 12-bit+ conversions - making it the preferred choice for new automotive designs targeting 3.3 V domain consolidation.
Availability
REF2033QDDCRQ1 is available at Aetrix Electronics and suitable for telematics control units, battery management systems, and on-board chargers requiring stable component supply with AEC-Q100 compliance and extended temperature operation.
Supply support for REF2033QDDCRQ1 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-grade product development and manufacturing expertise.
The REF20xx-Q1 family is designed specifically for high-precision, dual-rail voltage referencing in automotive signal chains - addressing needs in ADC biasing, current sensing, and functional safety-critical subsystems.
FAQ
What is the maximum operating temperature range for the REF2033QDDCRQ1?
The REF2033QDDCRQ1 is AEC-Q100 Grade 1 qualified and operates across –40°C to +125°C ambient temperature. Its junction temperature must not exceed 150°C, supported by RθJA = 193.6°C/W in the SOT23-5 package. Thermal derating is required above 125°C ambient when sourcing full ±20 mA load current.
Does the REF2033QDDCRQ1 support shutdown mode, and what is its quiescent current in that state?
Yes, the REF2033QDDCRQ1 supports active-high enable logic: pulling EN low (EN < 0.7 V) places the device in shutdown mode, reducing quiescent current to 5 µA typical. Both VREF and VBIAS outputs enter high-impedance state, and turn-on time to 0.1% settling is 500 µs with 1 µF load capacitance.
How does the REF2033QDDCRQ1 achieve VREF and VBIAS tracking accuracy?
The REF2033QDDCRQ1 uses a single band-gap core with two independent e-Trim™-calibrated buffers and precision resistor dividers (R1/R2 and R3/R4) to generate VREF and VBIAS. This architecture ensures both outputs track within ±7 ppm/°C over –40°C to +125°C, verified using the box-method calculation per datasheet Section 9.3.1.
Can the REF2033QDDCRQ1 drive capacitive loads, and what is the recommended range?
Yes, the REF2033QDDCRQ1 is stable with capacitive loads from 0 µF to 10 µF. The device maintains phase margin and transient response integrity across this range, as confirmed in Figures 7-21 through 7-26 of the datasheet. For best noise performance, 1 µF to 4.7 µF ceramic capacitors are recommended at each output.
Is the REF2033QDDCRQ1 pin-compatible with other members of the REF20xx-Q1 family?
Yes, all REF20xx-Q1 variants including REF2033QDDCRQ1, REF2030QDDCRQ1, and REF2025QDDCRQ1 share identical SOT23-5 pinout, electrical interface, and functional behavior - differing only in nominal output voltages. This allows drop-in replacement when adjusting reference levels without PCB revision.
REF2033QDDCRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.65V, 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 8ppm/°C
- Noise - 0.1Hz to 10Hz:
- 12ppmp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.31V ~ 5.5V
- Current - Supply:
- 460µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
REF2033QDDCRQ1 FAQ
1.How can I place an order for REF2033QDDCRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2033QDDCRQ1 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 REF2033QDDCRQ1 reliable?
The price and inventory of REF2033QDDCRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2033QDDCRQ1 is usually 5 days.
3.What payment methods are accepted for REF2033QDDCRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2033QDDCRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2033QDDCRQ1?
REF2033QDDCRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2033QDDCRQ1 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 REF2033QDDCRQ1?
For technical support, including REF2033QDDCRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2033QDDCRQ1 requirements.
6.How does Aetrix verify that REF2033QDDCRQ1 is sourced from the original manufacturer or authorized distributors?
All REF2033QDDCRQ1 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 REF2033QDDCRQ1 meets industry standards.
7.What is the process for return or replacement of REF2033QDDCRQ1?
All REF2033QDDCRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF2033QDDCRQ1, 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 REF2033QDDCRQ1 part is unused and in its original packaging.
Return procedure for REF2033QDDCRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF2033QDDCRQ1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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