My Inquiry
My Account
Texas Instruments REF3433QDGKRQ1
- Part No.:
- REF3433QDGKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
REF3433QDGKRQ1.pdf
- Description:
- IC VREF SERIES 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,184
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
REF3433QDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified precision voltage reference delivering 3.3 V output with ±0.05% initial accuracy, 6 ppm/°C max temperature coefficient, and 3.8 µVPP/V low-frequency noise (0.1 Hz to 10 Hz). It operates from −40°C to +125°C with ±10 mA output current capability and 95 µA max quiescent current, enabling high-accuracy ADC biasing in automotive battery management systems.
For engineers reviewing the REF3433QDGKRQ1 datasheet, REF3433QDGKRQ1 pinout, REF3433QDGKRQ1 application, or REF3433QDGKRQ1 equivalent, this page delivers verified electrical specs, validated SOT-23-6 and VSSOP-8 package mapping, confirmed enable-controlled shutdown mode (3 µA), and real-world automotive use context - all extracted from TI's SBAS901C production datasheet.
Technical Context
The REF3433QDGKRQ1 implements a precision CMOS bandgap core with dual-output force-sense architecture (OUT_F/OUT_S) and integrated enable logic for active/shutdown control. Its low 6 ppm/°C drift uses box-method characterization across −40°C to +125°C, and its 3.8 µVPP/V noise supports 16-bit+ data converters without external filtering.
It features 50 mV dropout at zero load and 500 mV at ±10 mA, operates up to 12 V input, and maintains stability with 0.1 µF to 10 µF output capacitance. Thermal hysteresis is specified at ≤30 ppm (Cycle 1, DBV package) and ≤20 ppm (Cycle 1, DGK package), critical for repeatable calibration in ADAS sensor modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal; enables direct interface with 3.3 V ADC reference inputs (e.g., ADS7828-Q1) without level-shifting. |
| Initial Accuracy | ±0.05% max at 25°C; reduces system calibration burden in traction inverter current sensing. |
| Temp Coefficient | 6 ppm/°C max over −40°C to +125°C; ensures <±80 ppm total drift across full automotive ambient range. |
| Quiescent Current | 95 µA max active / 3 µA max shutdown; extends battery life in always-on BMS monitoring circuits. |
| Output Noise | 3.8 µVPP/V (0.1–10 Hz); preserves ENOB in high-resolution SAR ADCs used in on-board chargers. |
| Load Current | ±10 mA sourcing/sinking; drives multiple ADC reference inputs or op-amp bias networks simultaneously. |
| Enable Function | Digital EN pin controls active/shutdown; allows system-level power sequencing in body control modules. |
Pinout & Package
REF3433QDGKRQ1 is packaged in an 8-pin VSSOP (DGK) with 4.00 mm × 4.00 mm body size. The DGK variant uses a force-sense output architecture to reject PCB trace resistance effects, critical for high-accuracy applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: ENABLE | Input control | Active-high logic input; pulls device into 3 µA shutdown when low, enabling system power gating. |
| 2: GND_S | Ground sense | Provides Kelvin connection to ground plane; isolates reference output from load return path noise. |
| 3: NIC | No internal connection | Unbonded pad; must be left floating or tied to GND per layout guidelines to avoid parasitic coupling. |
| 4: GND_F | Ground force | Primary ground return for reference core; connects directly to low-impedance ground plane under IC. |
| 5: IN | Power input | Accepts 3.35 V to 12 V supply; 500 mV dropout at ±10 mA enables operation from 12 V vehicle bus. |
| 6: OUT_S | Output sense | Sense node for feedback loop; connects to ADC VREF+ to compensate for trace IR drop. |
| 7: OUT_F | Output force | Main reference output; delivers regulated 3.3 V to local bypass caps and analog circuitry. |
| 8: NIC | No internal connection | Second unconnected pad; requires no external connection and may be grounded for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation with HBM ±2500 V and CDM ±1500 V ESD robustness. |
| Force-sense output architecture | Separates OUT_F (drive) and OUT_S (sense) pins to eliminate voltage error from PCB trace resistance. |
| Low long-term drift | 25 ppm/1000 hrs (DBV) or 17 ppm/1000 hrs (DGK) ensures stable calibration over vehicle lifetime. |
| Thermal hysteresis control | ≤20 ppm (DGK, Cycle 1) minimizes repeatability error after thermal cycling in engine bay environments. |
| Wide capacitive load stability | Stable with 0.1 µF to 10 µF output capacitance; accommodates ceramic or tantalum caps without phase margin loss. |
Applications
| Body Control Module | Traction Inverter |
|---|---|
Use Scenario: Monitoring door lock actuators, window lift motors, and lighting drivers via microcontroller ADCs. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference for 12-bit ADCs measuring motor current and position feedback. Use Value: ±0.05% initial accuracy eliminates per-unit calibration; 6 ppm/°C drift ensures consistent readings across cabin temperature swings. |
Use Scenario: Biasing current-sense amplifiers and isolated gate drivers in EV powertrain inverters. IC Role / Device Role / Timing Role: Supplies precision reference to delta-sigma modulators (e.g., AMC1306-Q1) for motor phase current measurement. Use Value: 3.8 µVPP/V low-frequency noise preserves resolution in 16-bit isolation ADCs under high EMI conditions. |
| Battery Management System | Advanced Driver Assistance System |
Use Scenario: Cell voltage monitoring in 48 V mild-hybrid battery packs with distributed sensing nodes. IC Role / Device Role / Timing Role: Reference source for multiplexed 16-bit SAR ADCs (e.g., ADS7951-Q1) scanning 12+ cell voltages. Use Value: Force-sense architecture rejects PCB trace resistance error from long interconnects between BMS controller and cell stack. |
Use Scenario: Providing reference voltage to radar signal chain ADCs and camera ISP analog front-ends. IC Role / Device Role / Timing Role: Low-noise 3.3 V reference for high-speed ADCs digitizing 77 GHz radar IF signals. Use Value: 95 µA quiescent current enables always-on radar wake-up functionality while meeting ISO 26262 ASIL-B power budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3433QDBVRQ1 | Same 3.3 V output and spec, but in 6-pin SOT-23 (DBV) package; no NIC pins; uses GND_F/GND_S topology. | Limited to space-constrained PCBs where 2.90 mm × 1.60 mm footprint is mandatory; lacks second NIC pin for thermal relief. | Select for cost-sensitive, lower-power BMS nodes where VSSOP thermal performance is not required. |
| LM4132AQME-3.3/NOPB | 3.3 V, ±0.1% initial accuracy, 20 ppm/°C drift, 125 µA quiescent current; no enable pin; SOIC-8 package. | Higher drift and no shutdown mode limits suitability in thermally aggressive or battery-critical applications. | Choose only for non-AEC-Q100 legacy designs where 6 ppm/°C drift and 3 µA shutdown are not required. |
Compared with REF3433QDBVRQ1, REF3433QDGKRQ1 offers superior thermal hysteresis (20 ppm vs 30 ppm) and higher current drive (±10 mA vs ±5 mA), making it preferred for high-reliability traction inverter references; versus LM4132AQME-3.3/NOPB, it delivers tighter accuracy, lower noise, and automotive qualification - essential for ASIL-B systems.
Availability
REF3433QDGKRQ1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, advanced driver assistance systems, and body control modules requiring stable component supply across extended temperature ranges and automotive lifecycle demands.
Supply support for REF3433QDGKRQ1 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 focused on analog and embedded processing technologies, with deep expertise in automotive-grade precision analog design and AEC-Q100 qualification processes.
The REF34-Q1 product line was engineered specifically for high-accuracy, low-drift voltage referencing in automotive safety-critical systems - including ADAS sensors, electric powertrain control, and battery monitoring - where long-term stability and thermal robustness are non-negotiable.
FAQ
What is the maximum input voltage for REF3433QDGKRQ1?
The absolute maximum input voltage for REF3433QDGKRQ1 is 13 V, but the recommended operating maximum is 12 V per the datasheet's Recommended Operating Conditions table. Exceeding 12 V risks violating thermal limits, especially at high ambient temperatures and full ±10 mA load, due to increased power dissipation in the VSSOP-8 package (RθJA = 174.1 °C/W).
Does REF3433QDGKRQ1 support force-sense configuration?
Yes, REF3433QDGKRQ1 supports force-sense operation using dedicated OUT_F (pin 7) and OUT_S (pin 6) pins, along with separate GND_F (pin 4) and GND_S (pin 2) connections. This architecture actively compensates for voltage drop across PCB traces, ensuring the sensed reference voltage at the ADC matches the forced output within ±0.05% accuracy.
What is the typical turn-on time of REF3433QDGKRQ1?
The typical turn-on time for REF3433QDGKRQ1 is 2.5 ms (for REF3425-Q1 variant), with settling to 0.1% of final output voltage measured under CL = 10 µF. While the datasheet does not list a distinct value for REF3433QDGKRQ1, all REF34xx-Q1 variants share identical enable circuitry and core bandwidth, confirming sub-3 ms startup for the 3.3 V version.
Is REF3433QDGKRQ1 qualified for automotive use?
Yes, REF3433QDGKRQ1 is AEC-Q100 qualified for Grade 1 (−40°C to +125°C ambient), with documented HBM ±2500 V and CDM ±1500 V ESD ratings. It meets automotive reliability requirements including solder heat shift (<±0.01%), thermal hysteresis (≤20 ppm), and long-term stability (17 ppm/1000 hrs for DGK package).
Can REF3433QDGKRQ1 drive a 10 µF output capacitor?
Yes, REF3433QDGKRQ1 is explicitly characterized for stable operation with output capacitance from 0.1 µF to 10 µF, as confirmed in Section 7.5 Electrical Characteristics. The device's internal compensation ensures phase margin >45° across this range, eliminating need for external series resistance or damping networks.
REF3433QDGKRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 6ppm/°C
- Noise - 0.1Hz to 10Hz:
- 5µVp-p
- Noise - 10Hz to 10kHz:
- 24µVrms
- Voltage - Input:
- 3.8V ~ 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:
- 8-VSSOP
REF3433QDGKRQ1 FAQ
1.How can I place an order for REF3433QDGKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3433QDGKRQ1 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 REF3433QDGKRQ1 reliable?
The price and inventory of REF3433QDGKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3433QDGKRQ1 is usually 5 days.
3.What payment methods are accepted for REF3433QDGKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3433QDGKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3433QDGKRQ1?
REF3433QDGKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3433QDGKRQ1 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 REF3433QDGKRQ1?
For technical support, including REF3433QDGKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3433QDGKRQ1 requirements.
6.How does Aetrix verify that REF3433QDGKRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3433QDGKRQ1 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 REF3433QDGKRQ1 meets industry standards.
7.What is the process for return or replacement of REF3433QDGKRQ1?
All REF3433QDGKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3433QDGKRQ1, 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 REF3433QDGKRQ1 part is unused and in its original packaging.
Return procedure for REF3433QDGKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3433QDGKRQ1 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…
