Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

STMicroelectronics RHF100K1

Name: RHF100K1
Brand: STMicroelectronics
SKU: RHF100K1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: RHF100K1

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: 10-CFlatpack

Datasheet:: RHF100K1.pdf

Description:: IC VREF SHUNT 1.2V 10CFP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,621

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

RHF100K1 from STMicroelectronics is a radiation-hardened, 1.2 V fixed shunt voltage reference designed for precision biasing and ADC reference applications in space-grade systems. It delivers ±0.15 % initial accuracy, 15 ppm/°C temperature coefficient over −55 °C to +125 °C, 40 µA–12 mA operating current range, and maintains 0.02 % long-term stability after 3000 hrs - deployed in satellite telemetry chains and radiation-tolerant data acquisition units.

For engineers reviewing the RHF100K1 datasheet, RHF100K1 pinout, RHF100K1 application, or RHF100K1 equivalent, key selection criteria include total ionizing dose (TID) immunity up to 300 krad (Si), SEL immunity at 120 MeV·cm²/mg, low-noise spectral density (440 nV/√Hz @ 1 kHz), and hermetic Flat-10 ceramic packaging for mission-critical aerospace environments.

Technical Context

The RHF100K1 implements a second-order temperature-compensated Zener-based shunt architecture with internal double bonding to achieve ≤110 mΩ equivalent output resistance. Its design eliminates thermal hysteresis and minimizes ΔVk drift under thermal cycling across −55 °C to +125 °C.

Radiation hardening is achieved via QML-V qualification per MIL-STD-883 TM 1019, with ELDRS-free performance verified at both high-dose (50–300 rad/s) and low-dose (0.01 rad/s) rates up to 300 krad (Si). Heavy-ion testing confirms no single-event latchup (SEL) at 120 MeV·cm²/mg and full SET characterization.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.2 V nominal; stable ±0.15 % initial tolerance enables direct use as ADC reference without trimming.
Temp. Coefficient	15 ppm/°C max (−55 °C to +125 °C); ensures <±0.3 mV drift over full range for precision sensor signal chains.
Operating Current	40 µA to 12 mA; supports ultra-low-power standby modes and high-accuracy active measurement phases.
TID Immunity	300 krad (Si) high/low dose rate; guarantees parametric stability in LEO, GEO, and deep-space missions.
SEL Threshold	No latchup up to 120 MeV·cm²/mg at 125 °C; eliminates need for external current limiting in high-radiation orbits.
Long-Term Stability	0.02 % over 3000 hrs; reduces calibration frequency in unattended orbital instruments.
Noise Density	440 nV/√Hz @ 1 kHz, 25 °C; preserves SNR in 16-bit+ SAR ADC front-ends.

Pinout & Package

Mounted in a hermetic Flat-10 ceramic package (SMD pin designation: 5962F14225), the RHF100K1 features two terminals: Anode (A) and Cathode (K). The package provides hermetic sealing, 0.50 g mass, and thermal resistance of 40 °C/W junction-to-case.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Reference ground node	Internally tied to system GND; establishes 0 V reference point for Vk measurement and current sink path.
Cathode (K)	Output voltage node	Provides regulated 1.2 V output; sinks cathode current (Ik) from external resistor or load; requires ≥100 nF bypass capacitance for stability.

Key Features

Feature	Design Value
Second-order temp. compensation	Enables S-shaped Vk vs. T curve, reducing average TC to 15 ppm/°C and minimizing curvature-induced error in wide-temp deployments.
Double-bonded die structure	Lowers equivalent static resistance to 0.11 Ω (typ.), improving load regulation and reducing voltage shift under dynamic Ik changes.
ELDRS-free radiation response	Zero parametric degradation after 300 krad exposure at both high and low dose rates - validated per MIL-PRF-38535 Class V.
Low-noise spectral density	440 nV/√Hz @ 1 kHz enables sub-LSB noise contribution in 18-bit ADC references without external filtering.
Hermetic Flat-10 package	Meets MIL-STD-883 screening for space-grade reliability; supports reflow soldering while maintaining moisture barrier integrity.

Applications

Spaceborne ADC Reference

Satellite Telemetry Biasing

Use Scenario: High-resolution analog-to-digital conversion in star tracker or radiation monitor front-ends aboard LEO satellites.

IC Role / Device Role / Timing Role: Provides stable 1.2 V reference voltage for 16-bit SAR ADCs sampling sensor outputs at 1 MSPS.

Use Value: 0.02 % long-term stability and 15 ppm/°C TC ensure <±0.5 LSB drift over 5-year mission life without recalibration.

Use Scenario: Biasing precision op-amps and transimpedance amplifiers in spacecraft telemetry signal conditioning modules.

IC Role / Device Role / Timing Role: Shunt reference establishing accurate gain-setting nodes for low-noise current-to-voltage conversion.

Use Value: 440 nV/√Hz noise density and 0.11 Ω output impedance preserve dynamic range in sub-picoamp photocurrent measurements.

Aerospace Instrumentation Calibration

Radiation-Hardened Data Acquisition

Use Scenario: On-board calibration source for flight-critical pressure, temperature, and inertial sensors in launch vehicle avionics.

IC Role / Device Role / Timing Role: Fixed 1.2 V reference used in ratiometric bridge excitation and offset nulling circuits.

Use Value: ±0.15 % initial accuracy and 2 ppm/°C long-term TC drift enable traceable NIST-equivalent calibration without ground intervention.

Use Scenario: Core reference element in radiation-tolerant DAQ systems monitoring nuclear reactor control rods or particle detector arrays.

IC Role / Device Role / Timing Role: Primary voltage reference for multi-channel simultaneous-sampling ADCs operating continuously under 100 krad/hr flux.

Use Value: 300 krad TID immunity and SEL immunity at 120 MeV·cm²/mg eliminate single-point failure modes in safety-critical monitoring loops.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL21010CFB812	1.2 V, ±0.2 % initial accuracy, 50 ppm/°C TC, non-radiation-hardened, SOIC-8 package	Qualified only for commercial/industrial use; not rated for TID > 10 krad or SEL events	Select only for ground-test equipment or non-flight subsystems where radiation immunity is unnecessary.
REF7012QPWR	1.2 V, ±0.025 % initial accuracy, 3 ppm/°C TC, 3.3 V supply requirement, non-shunt topology	Series reference requiring external supply; incompatible with shunt-based bias networks and floating current sources	Use only when system architecture permits series regulation and ultra-high initial accuracy outweighs radiation tolerance needs.

Compared with ISL21010CFB812 and REF7012QPWR, the RHF100K1 uniquely combines space-grade radiation hardness, shunt topology compatibility, and 0.02 % long-term stability - making it irreplaceable in flight-critical reference paths where TID resilience and SEL immunity are mandatory.

Availability

RHF100K1 is available at Aetrix Electronics and suitable for satellite telemetry systems, radiation-hardened data acquisition units, aerospace instrumentation calibration modules, and spaceborne ADC reference designs requiring stable component supply across extended production lifecycles.

Supply support for RHF100K1 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

STMicroelectronics is a global semiconductor leader specializing in automotive, industrial, and aerospace-grade ICs, with over 30 years of heritage in radiation-hardened analog products.

The RHF100K1 belongs to ST's Rad-Hard Analog portfolio, engineered specifically for mission-critical space electronics where parametric stability under extreme radiation, temperature, and vacuum conditions is non-negotiable.

FAQ

What is the recommended external capacitor value for RHF100K1 stability?

The RHF100K1 requires a minimum 100 nF ceramic capacitor between cathode and anode for stable operation across its full temperature and current range. Datasheet Figure 61 defines the recommended operating area: 100 nF to 470 nF is optimal for Ik = 100 µA–10 mA; values above 470 nF may induce instability under fast current transients.

Does RHF100K1 require burn-in before flight use?

Yes - the RHF100K1 undergoes 240 hours of initial burn-in at 125 °C prior to final test. This step is integral to its QML-V qualification and ensures early-life parameter stabilization; flight units must retain this burn-in history for traceability per MIL-PRF-38535 requirements.

Can RHF100K1 be used in series with other references?

No - the RHF100K1 is a shunt reference and must be connected in parallel with its load. It cannot be cascaded or stacked in series. Attempting series connection violates its internal Zener-based architecture and risks thermal runaway due to uncontrolled power dissipation in the anode path.

What is the maximum allowable power dissipation at 125 °C ambient?

At 125 °C ambient, the RHF100K1's maximum safe cathode current is 12 mA, yielding 14.4 mW (1.2 V × 12 mA) dissipation. With Rthjc = 40 °C/W, junction temperature remains ≤175 °C - within the 150 °C absolute max rating - only if case temperature is actively managed below 125 °C via heatsinking or PCB copper area.

RHF100K1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 10-CFlatpack

Series:: -

Packaging:: Strip

Product Status:: Active

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 1.2V

Voltage - Output (Max):: -

Current - Output:: 12 mA

Tolerance:: ±0.15%

Temperature Coefficient:: 15ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 15.495µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 40 µA

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-CFlatpack

RHF100K1 FAQ

1.How can I place an order for RHF100K1 through Aetrix?

Please submit a Request for Quotation (RFQ) for RHF100K1 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 RHF100K1 reliable?

The price and inventory of RHF100K1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RHF100K1 is usually 5 days.

3.What payment methods are accepted for RHF100K1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RHF100K1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RHF100K1?

RHF100K1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RHF100K1 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 RHF100K1?

For technical support, including RHF100K1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RHF100K1 requirements.

6.How does Aetrix verify that RHF100K1 is sourced from the original manufacturer or authorized distributors?

All RHF100K1 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 RHF100K1 meets industry standards.

7.What is the process for return or replacement of RHF100K1?

All RHF100K1 units undergo pre-shipment inspection (PSI). If there is an issue with RHF100K1, 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 RHF100K1 part is unused and in its original packaging.

Return procedure for RHF100K1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

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.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

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…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

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…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

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…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

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 …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

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…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

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…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

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…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

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…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

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…