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Diodes Incorporated ZXRE1004ER
- Part No.:
- ZXRE1004ER
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
ZXRE1004ER.pdf
- Description:
- IC VREF SHUNT 2% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,498
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Product details
Overview
ZXRE1004ER from Diodes Incorporated is a 1.22 V bandgap voltage reference IC with 4 µA typical knee current, 20 ppm/°C typical temperature coefficient, and ±1% initial tolerance in SOT23 package-designed for ultra-low-power precision biasing in battery-powered instrumentation and portable A/D converters.
For engineers reviewing the ZXRE1004ER datasheet, ZXRE1004ER pinout, ZXRE1004ER application, or ZXRE1004ER equivalent, key selection criteria include microamp-level operating current, capacitive-load stability, tight thermal drift, and compatibility with legacy REF1004/LT1004 footprints in space-constrained designs.
Technical Context
The ZXRE1004ER operates as a two-terminal shunt reference, sinking current from an external resistor to ground to maintain a stable 1.22 V reverse breakdown voltage across its terminals. Its bandgap core achieves low drift via curvature compensation, and it remains unconditionally stable with capacitive loads up to several hundred nanofarads without requiring series resistance.
It functions over a wide supply current range (8 µA to 20 mA), delivering consistent regulation despite variations in input voltage or load conditions. The device's 0.2 Ω typical dynamic impedance at 1 mA ensures minimal output voltage perturbation under transient current changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.22 V nominal; maintains ±1% accuracy over initial calibration at 25°C |
| Knee Current | 4 µA typical; minimum current required to establish regulation, enabling ultra-low-power operation |
| Tempco | 20 ppm/°C typical; limits voltage drift to ±1.7 mV over –40°C to +85°C industrial range |
| Operating Current Range | 8 µA to 20 mA; supports flexible biasing from micropower sensors to moderate-precision supplies |
| Dynamic Impedance | 0.2 Ω typical at 1 mA; minimizes AC error during fast current transients in data acquisition |
| Wideband Noise | 60 µV(rms) (10 Hz–10 kHz); suitable for 12-bit ADC references without additional filtering |
| Capacitive Load Stability | Unconditionally stable; no external compensation needed for bypass caps up to 100 nF |
Pinout & Package
SOT23-3 package (JEDEC MO-215AA), 2.8 mm × 2.64 mm footprint, 1.12 mm height; thermally enhanced plastic body with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current sink input | Connected to positive supply rail via current-setting resistor; regulates by sinking variable current |
| Pin 2 (Cathode) | Reference output | Provides stable 1.22 V relative to ground; connected to load or ADC reference input |
| Pin 3 (NC / Floating) | No-connect terminal | Internally unconnected; must remain floating or tied to Pin 2 per datasheet guidance for SOT23-F variant |
Key Features
| Feature | Design Value |
|---|---|
| Microamp knee current | Enables direct use with high-value bias resistors (>1 MΩ) in coin-cell applications |
| Unconditional capacitive stability | Eliminates need for series damping resistor when decoupling with ceramic caps |
| Low dynamic impedance | Reduces output voltage sag during 10 µs current steps in sampling circuits |
| Wide operating current range | Supports single BOM across multiple power modes: sleep (8 µA), active (1 mA), and burst (20 mA) |
| RoHS-compliant & halogen-free | Meets IPC-1752A Class 2 reporting requirements for automotive and medical OEMs |
Applications
| Battery-Powered Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter using CR2032 battery with 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.22 V reference for ADC internal gain stage and offset calibration. Use Value: 4 µA knee current extends battery life beyond 10 years in standby; 20 ppm/°C tempco ensures <0.02% full-scale error across operating temperature. | Use Scenario: Industrial sensor node with RTD bridge and 12-bit SAR ADC. IC Role / Device Role / Timing Role: Low-noise voltage reference for ratiometric excitation and ADC reference input. Use Value: 60 µV(rms) noise avoids adding quantization uncertainty; unconditional stability allows direct 100 nF ceramic bypass without oscillation. |
| Portable Communication Devices | Notebook Power Management |
Use Scenario: Bluetooth LE audio earbud with integrated Li-ion fuel gauge and ADC. IC Role / Device Role / Timing Role: Reference for battery voltage monitoring ADC and analog front-end biasing. Use Value: 1% initial tolerance enables accurate state-of-charge estimation without factory calibration; SOT23 footprint saves PCB area in 3.5 mm × 3.5 mm module. | Use Scenario: Ultrabook system power rail monitor with embedded controller ADC. IC Role / Device Role / Timing Role: Precision reference for 3.3 V and 5 V rail sensing circuitry. Use Value: Stable regulation across 8 µA–20 mA range accommodates varying controller wake/sleep currents without reference shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1004CZ-1.2 | Same 1.2 V nominal, but 50 ppm/°C max tempco vs. ZXRE1004ER's 75 ppm/°C max; higher 10 µA knee current | Less suitable for sub-10 µA systems; preferred where wider temp range (–55°C to +125°C) is required | Select LT1004CZ-1.2 only if extended temperature rating is mandatory and power budget allows ≥10 µA minimum current |
| REF1004CP | 1.2 V reference with 20 ppm/°C typical tempco, but TO-92 package (larger footprint, lower thermal performance) | Not viable for high-density portable PCBs; better for through-hole prototyping or legacy upgrades | Choose REF1004CP only for E-Line drop-in replacement in existing TO-92 layouts; avoid for new SMT designs |
Compared with LT1004CZ-1.2 and REF1004CP, the ZXRE1004ER delivers superior micropower operation and SMT scalability while maintaining competitive thermal stability-making it optimal for next-generation compact, battery-constrained systems where board area and quiescent current are critical.
Availability
ZXRE1004ER is available at Aetrix Electronics and suitable for battery-powered instrumentation, precision data acquisition, and portable communication devices requiring stable component supply with guaranteed long-term sourcing.
Supply support for ZXRE1004ER 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The ZXRE1004ER belongs to Diodes' precision reference product line, engineered specifically for ultra-low-power, high-stability voltage referencing in portable and energy-sensitive applications.
FAQ
What is the recommended external bias resistor for ZXRE1004ER at 3.3 V supply?
At 3.3 V supply, a 470 kΩ resistor sets nominal operating current at ~4.5 µA-just above the 4 µA knee point-ensuring reliable regulation while minimizing power draw. For tighter regulation across temperature, use 1% metal-film resistor and verify minimum current stays ≥8 µA at worst-case low-temp/low-VCC.
Can ZXRE1004ER drive a 10 nF ceramic capacitor directly?
Yes-the ZXRE1004ER is unconditionally stable with capacitive loads up to 100 nF. A 10 nF ceramic capacitor may be placed directly across Pins 1 and 2 for high-frequency noise suppression without risk of oscillation or phase margin loss.
Is ZXRE1004ER qualified for automotive applications?
No-ZXRE1004ER is not AEC-Q100 qualified. Diodes offers automotive-grade alternatives (e.g., AP2112K) for safety-critical systems; this part is specified for industrial and consumer applications within –40°C to +85°C ambient.
How does the 1% tolerance affect ADC accuracy in a 12-bit system?
With 1% initial tolerance, ZXRE1004ER contributes up to ±40.96 LSB error in a 12-bit (4096-step) system referenced to 1.22 V. System-level calibration or ratiometric design mitigates this; for uncalibrated use, expect ±0.5% full-scale error before tempco and noise contributions.
ZXRE1004ER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 8 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
ZXRE1004ER FAQ
1.How can I place an order for ZXRE1004ER through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE1004ER 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 ZXRE1004ER reliable?
The price and inventory of ZXRE1004ER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE1004ER is usually 5 days.
3.What payment methods are accepted for ZXRE1004ER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE1004ER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE1004ER?
ZXRE1004ER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE1004ER 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 ZXRE1004ER?
For technical support, including ZXRE1004ER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE1004ER requirements.
6.How does Aetrix verify that ZXRE1004ER is sourced from the original manufacturer or authorized distributors?
All ZXRE1004ER 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 ZXRE1004ER meets industry standards.
7.What is the process for return or replacement of ZXRE1004ER?
All ZXRE1004ER units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE1004ER, 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 ZXRE1004ER part is unused and in its original packaging.
Return procedure for ZXRE1004ER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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