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Analog Devices Inc. LT1034CS8-1.2#PBF
- Part No.:
- LT1034CS8-1.2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1034CS8-1.2#PBF.pdf
- Description:
- IC VREF SHUNT 1.225V/7V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:570
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Product details
Overview
LT1034CS8-1.2 from Analog Devices (formerly Linear Technology) is a micropower dual-output precision voltage reference IC providing a 1.225V bandgap output and a 7.0V subsurface zener output in an 8-lead SOIC package. It delivers ±0.5% initial accuracy, 20 ppm/°C max temperature drift (commercial grade), 1Ω dynamic impedance, and operates from 20µA to 20mA - enabling use in portable meters and low-power precision regulators.
For engineers reviewing the LT1034CS8-1.2 datasheet, LT1034CS8-1.2 pinout, LT1034CS8-1.2 application, or LT1034CS8-1.2 equivalent, key selection criteria include guaranteed drift performance over 0°C to 70°C, dual-reference architecture for system-level calibration, low-noise operation (4 µVP-P, 0.1–10 Hz), and compatibility with unregulated supplies due to low dynamic impedance.
Technical Context
The LT1034CS8-1.2 integrates two independent reference elements: a trimmed thin-film bandgap core for the 1.225V output (±0.5% initial tolerance, 20 ppm/°C drift) and a separate subsurface zener for the 7.0V output (±3% tolerance, 40 ppm/°C drift). Both outputs share a common cathode connection but operate independently under reverse bias.
Its SO-8 package supports surface-mount assembly and thermal performance with θJA = 160°C/W. The device requires no external components for basic operation and maintains stability across 20µA–20mA load current while exhibiting only 0.5–2.0 mV reverse voltage change over that range for the 1.2V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (1.2V) | 1.225 V ±0.5% at 100 µA - enables high-accuracy ADC/DAC biasing without trimming |
| Reference Voltage (7V) | 7.0 V ±3% at 100 µA - provides stable auxiliary reference for non-critical analog blocks |
| Temp Coefficient (1.2V) | 20 ppm/°C max (0°C to 70°C) - ensures ≤1.25 mV total drift across full commercial range |
| Dynamic Impedance | 1 Ω max at 100 µA - allows stable regulation even with noisy or varying input supplies |
| Operating Current Range | 20 µA to 20 mA - supports ultra-low-power sleep modes and full-scale sensor excitation |
| Low-Frequency Noise | 4 µVP-P, 0.1–10 Hz - minimizes noise contribution in high-resolution measurement front-ends |
| Long-Term Stability | 20 ppm/√khrs - ensures calibration integrity over multi-year deployments |
Pinout & Package
LT1034CS8-1.2 is housed in an 8-lead plastic SOIC (narrow, 0.150") package per LTC DWG #05-08-1610, with standard SO-8 footprint and lead pitch of 1.27 mm. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating or grounded per layout best practice |
| 2 | NC | No internal connection - no routing required; avoid stubs |
| 3 | NC | No internal connection - electrically isolated from both reference outputs |
| 4 | GND | Analog ground reference for both 1.2V and 7V outputs - must be low-impedance star point |
| 5 | 7V Output | Cathode of subsurface zener - reverse-biased output requiring series resistor for current setting |
| 6 | 1.2V/2.5V Output | Cathode of bandgap reference - primary precision output; shares cathode node with Pin 5 |
| 7 | NC | No internal connection - not bonded; ignore in layout |
| 8 | NC | No internal connection - unused pad; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent references | Simultaneous 1.225V (precision) + 7.0V (auxiliary) outputs reduce BOM count and board space |
| Guaranteed 20 ppm/°C drift (1.2V) | Meets industrial-grade stability requirements without derating or overspec'ing |
| 1Ω dynamic impedance | Enables direct connection to ADC reference inputs without buffering, saving power and area |
| 20µA minimum operating current | Supports battery-powered designs with >10-year shelf life in sleep mode |
| Low 0.1–10 Hz noise | 4 µVP-P ensures <16-bit effective resolution in precision data acquisition systems |
Applications
| Portable Digital Multimeters | Precision DC-DC Regulator Feedback |
|---|---|
Use Scenario: Handheld DMMs requiring stable, low-power reference for 5½-digit ADC conversion across –10°C to 50°C ambient. IC Role / Device Role / Timing Role: Primary 1.225V reference for SAR ADC and secondary 7.0V reference for auto-ranging circuitry. Use Value: 20 ppm/°C drift ensures <0.01% reading error over operating range; 20µA quiescent current extends battery life beyond 200 hours. | Use Scenario: Isolated flyback or forward converter where output voltage sensing must remain accurate despite input ripple and load transients. IC Role / Device Role / Timing Role: Precision 1.225V shunt reference in optocoupler feedback loop; 7.0V output powers TL431 bias network. Use Value: 1Ω dynamic impedance rejects supply noise; dual outputs eliminate need for discrete Zener + bandgap combo. |
| Calibration Equipment | Industrial Sensor Signal Conditioning |
Use Scenario: Benchtop calibrator generating traceable 10V, 1V, and 100mV outputs via resistor dividers from a master reference. IC Role / Device Role / Timing Role: Master 1.225V reference feeding precision DAC and buffered divider chain; 7.0V output drives op-amp rails. Use Value: 20 ppm/√khrs long-term stability reduces annual recalibration frequency; low hysteresis ensures repeatability after thermal cycling. | Use Scenario: 4–20 mA transmitter with RTD or strain gauge input, requiring ratiometric excitation and ADC reference from same source. IC Role / Device Role / Timing Role: 1.225V reference for both bridge excitation and ADC - enabling true ratiometric measurement. Use Value: Matching tempcos between excitation and reference cancel thermal errors; 4 µVP-P noise avoids digitization uncertainty in 24-bit sigma-delta converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1004CS8-1.2 | Single 1.2V bandgap reference; no 7V output; 50 ppm/°C drift (typ); higher dynamic impedance (5Ω) | Lacks auxiliary reference; unsuitable where dual-rail calibration or auxiliary bias is needed | Select when only one precision reference is required and cost sensitivity outweighs drift performance |
| LT1236CS8-1.2 | Buried zener-based; 3 ppm/°C drift; 1.2V output only; higher quiescent current (1.5mA min); 0.2Ω impedance | Superior drift/noise but no 7V output; consumes >70× more current than LT1034CS8-1.2 | Select for metrology-grade stability where power budget permits and auxiliary reference is unnecessary |
Compared with LT1004CS8-1.2 and LT1236CS8-1.2, the LT1034CS8-1.2 uniquely balances ultra-low power (20µA), dual-output capability, and guaranteed 20 ppm/°C drift - making it optimal for portable, battery-constrained systems needing both precision and flexibility.
Availability
LT1034CS8-1.2 is available at Aetrix Electronics and suitable for portable meters, precision regulators, and calibrators requiring stable component supply, long-term calibration integrity, and low-power operation across commercial temperature range.
Supply support for LT1034CS8-1.2 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
Analog Devices acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for legacy Linear parts including the LT1034 family.
The LT1034 series was designed specifically for micropower, dual-output precision reference applications in portable test equipment and industrial instrumentation - emphasizing drift stability, low noise, and minimal external component count.
FAQ
What is the maximum operating temperature range for the LT1034CS8-1.2?
The LT1034CS8-1.2 is rated for commercial operation from 0°C to 70°C. Its absolute maximum junction temperature is 150°C, and thermal resistance is θJA = 160°C/W in the SO-8 package. Operation outside the specified range may degrade drift performance or long-term stability, and is not guaranteed by Analog Devices.
Can the 7V and 1.2V outputs of the LT1034CS8-1.2 be used simultaneously without interference?
Yes - the LT1034CS8-1.2 integrates two physically separate reference elements sharing only the cathode node (Pins 5 and 6). Electrical interaction is minimized by design; datasheet testing confirms independent operation with <2 mV cross-coupling under typical bias conditions. No additional isolation components are required.
Is the LT1034CS8-1.2 pin-compatible with the LT1034IS8-1.2?
Yes - both LT1034CS8-1.2 and LT1034IS8-1.2 use identical SO-8 packaging and pinout. The only difference is temperature grade: 'C' denotes 0°C to 70°C, while 'I' specifies –40°C to 85°C. All electrical specifications except temperature drift and operating range are identical; PCB layout is fully interchangeable.
Does the LT1034CS8-1.2 require external capacitors for stability?
No - the LT1034CS8-1.2 is internally compensated and stable with purely resistive loads. A 1µF ceramic capacitor at the 1.2V output is recommended only for noise reduction in sensitive measurement circuits; it is not required for basic regulation or loop stability. No capacitor is needed on the 7V output.
How does the LT1034CS8-1.2 compare to the LM385 in terms of temperature drift?
The LT1034CS8-1.2 guarantees ≤20 ppm/°C drift over 0°C to 70°C, whereas the LM385B-1.2 typically exhibits 50–100 ppm/°C drift and is not specified over temperature. This makes the LT1034CS8-1.2 a direct high-stability upgrade path for designs where calibration drift limits measurement accuracy - especially in portable or thermally variable environments.
LT1034CS8-1.2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Shunt, Dual
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V, 7V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.2%
- Temperature Coefficient:
- 40ppm/°C, -
- Noise - 0.1Hz to 10Hz:
- 4µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1034CS8-1.2#PBF FAQ
1.How can I place an order for LT1034CS8-1.2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1034CS8-1.2#PBF 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 LT1034CS8-1.2#PBF reliable?
The price and inventory of LT1034CS8-1.2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1034CS8-1.2#PBF is usually 5 days.
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Once your LT1034CS8-1.2#PBF 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 LT1034CS8-1.2#PBF?
For technical support, including LT1034CS8-1.2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1034CS8-1.2#PBF requirements.
6.How does Aetrix verify that LT1034CS8-1.2#PBF is sourced from the original manufacturer or authorized distributors?
All LT1034CS8-1.2#PBF 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 LT1034CS8-1.2#PBF meets industry standards.
7.What is the process for return or replacement of LT1034CS8-1.2#PBF?
All LT1034CS8-1.2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1034CS8-1.2#PBF, 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 LT1034CS8-1.2#PBF part is unused and in its original packaging.
Return procedure for LT1034CS8-1.2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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