REF3133AIDBZTG4 Equivalent & Substitute Parts

Part Overview

The REF3133AIDBZTG4 is a series voltage reference IC manufactured by Texas Instruments, delivering a fixed 3.3V output with ±0.2% tolerance in a SOT-23-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The REF3133 series provides stable voltage references suitable for precision analog applications requiring low noise and tight output tolerance specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	REF3133AIDBZTG4
Manufacturer	Texas Instruments
Output Voltage (Fixed)	3.3V
Output Current	10 mA
Tolerance	±0.2%
Temperature Coefficient	20ppm/°C
Noise (0.1Hz to 10Hz)	43µVp-p
Noise (10Hz to 10kHz)	63µVrms
Input Voltage Range	3.35V ~ 5.5V
Supply Current	135µA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the REF3133AIDBZTG4 is determined by the following critical parameters:

Output Voltage: Must be fixed at 3.3V
Package Type: Must be SOT-23-3 (TO-236-3, SC-59)
Tolerance: ±0.2% or tighter
Temperature Coefficient: 20ppm/°C or lower
Output Current Capability: Minimum 10 mA
Input Voltage Range: Must accommodate 3.35V ~ 5.5V
Operating Temperature Range: Must support -40°C ~ 125°C or equivalent industrial range
Compliance: ROHS3 compliant

Substitute parts are grouped into three categories:

Category 1: Direct Parametric Equivalents (Texas Instruments REF3133 Series) These parts maintain identical electrical specifications and differ only in packaging format or product status. REF3133AIDBZR and REF3133AIDBZT are active production alternatives to the obsolete REF3133AIDBZTG4. REF3133AQDBZRQ1 is an automotive-grade variant with AEC-Q100 qualification.

Category 2: Manufacturer Recommended Alternatives (Cross-Manufacturer) ISL21080CIH333Z-TK (Renesas) and LT1460 series (Analog Devices) meet the core voltage reference requirements but introduce variations in output current, supply current, and operating temperature range. These parts are suitable when the specific parameter variations are acceptable for the application.

Category 3: Tolerance and Performance Variants LT1460 parts are available in multiple tolerance grades (±0.2%, ±0.4%, ±0.5%) and higher output current ratings (40 mA vs. 10 mA). Selection depends on application requirements for output current and tolerance specifications.

Parameter Comparison

Parameter	REF3133AIDBZTG4	REF3133AIDBZR	REF3133AIDBZT	REF3133AQDBZRQ1	ISL21080CIH333Z-TK	LT1460HCS3-3.3#TRMPBF	LT1460KCS3-3.3#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Renesas Electronics	Analog Devices	Analog Devices
Output Voltage	3.3V	3.3V	3.3V	3.3V	3.3V	3.3V	3.3V
Output Current	10 mA	10 mA	10 mA	10 mA	7 mA	40 mA	40 mA
Tolerance	±0.2%	±0.2%	±0.2%	±0.2%	±0.2%	±0.2%	±0.5%
Temperature Coefficient	20ppm/°C	20ppm/°C	20ppm/°C	20ppm/°C	50ppm/°C	20ppm/°C	50ppm/°C
Input Voltage Range	3.35V ~ 5.5V	3.35V ~ 5.5V	3.35V ~ 5.5V	3.35V ~ 5.5V	4.6V ~ 5.5V	4.2V ~ 20V	4.2V ~ 20V
Supply Current	135µA	135µA	135µA	135µA	1.5µA	220µA	220µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: REF3133AIDBZR or REF3133AIDBZT

These Texas Instruments parts are direct parametric equivalents to the obsolete REF3133AIDBZTG4. Both maintain identical electrical specifications including 3.3V output, ±0.2% tolerance, 20ppm/°C temperature coefficient, and -40°C to 125°C operating range. REF3133AIDBZR is available in higher quantity (30,501 pcs) and offers superior procurement continuity. Both parts are ROHS3 compliant and in active production status.

Automotive Applications: REF3133AQDBZRQ1

For automotive or AEC-Q100 qualified designs, the REF3133AQDBZRQ1 provides identical electrical performance with automotive-grade qualification. Moisture sensitivity level is MSL 2 (1 Year) versus MSL 1 (Unlimited) for standard grades. This part is suitable for automotive reference voltage applications requiring formal qualification documentation.

Higher Output Current Requirement: LT1460HCS3-3.3#TRMPBF or LT1460HCS3-3.3#TRPBF

When output current exceeding 10 mA is required, the LT1460 series from Analog Devices provides 40 mA output capability with ±0.2% tolerance and 20ppm/°C temperature coefficient. Input voltage range extends to 20V maximum, supporting higher supply voltages. Operating temperature range is limited to 0°C ~ 70°C, which is narrower than the original part. These parts are suitable for applications requiring higher load current from the reference output.

Lower Supply Current Requirement: ISL21080CIH333Z-TK

The Renesas ISL21080CIH333Z-TK offers significantly reduced supply current (1.5µA versus 135µA), beneficial for battery-powered or ultra-low-power applications. Output current is limited to 7 mA. Temperature coefficient is 50ppm/°C, and operating range is -40°C ~ 85°C. This part is suitable when power consumption is a critical design constraint.

Frequently Asked Questions (FAQ)

Q: Can REF3133AIDBZR directly replace REF3133AIDBZTG4 without circuit modifications?

A: Yes. REF3133AIDBZR is a direct parametric equivalent with identical electrical specifications, tolerance, temperature coefficient, and operating range. The only difference is product status (active versus obsolete) and packaging format. No circuit modifications are required.

Q: What is the difference between REF3133AIDBZR and REF3133AIDBZT?

A: Both parts are parametrically identical. The difference is in packaging format: REF3133AIDBZR is supplied in Cut Tape (CT) & Digi-Reel format, while REF3133AIDBZT is also in Cut Tape & Digi-Reel. REF3133AIDBZR has higher inventory availability (30,501 pcs versus 1,201 pcs).

Q: Can LT1460 series parts replace REF3133AIDBZTG4?

A: LT1460 parts meet the core voltage reference requirements (3.3V output, ±0.2% tolerance, SOT-23-3 package) but introduce trade-offs. Operating temperature range is narrower (0°C ~ 70°C versus -40°C ~ 125°C), and supply current is higher (220µA versus 135µA). LT1460 parts are suitable only if the application does not require the full -40°C ~ 125°C temperature range and higher supply current is acceptable.

Q: Is REF3133AQDBZRQ1 suitable for non-automotive applications?

A: Yes. REF3133AQDBZRQ1 is electrically identical to REF3133AIDBZR and REF3133AIDBZT. The automotive qualification and AEC-Q100 certification are additional qualifications that do not restrict use in non-automotive applications. This part is a valid substitute for any application requiring the REF3133 specifications.

Q: What is the impact of using ISL21080CIH333Z-TK in a design originally specified for REF3133AIDBZTG4?

A: ISL21080CIH333Z-TK provides the same 3.3V output and ±0.2% tolerance but with three key differences: (1) output current is limited to 7 mA instead of 10 mA, (2) supply current is dramatically lower at 1.5µA, and (3) operating temperature range is -40°C ~ 85°C instead of -40°C ~ 125°C. This part is suitable only if the application can tolerate reduced output current capability and does not require operation above 85°C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the original REF3133AIDBZTG4.

Q: What packaging formats are available for REF3133 equivalents?

A: All REF3133 equivalents are supplied in SOT-23-3 package (also designated TO-236-3 or SC-59). Packaging format options include Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) configurations, depending on the specific part number variant.

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