LFXTAL003156BULK - 8MHz ±30ppm Crystal 30pF HC-49/4H | IQD
Référence : LFXTAL003156BULK ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.62 | $0,62 |
| 10 | $0.55 | $5,50 |
| 100 | $0.45 | $45,00 |
| 500 | $0.38 | $190,00 |
| 1 000 | $0.32 | $320,00 |
LFXTAL003156BULK Présentation
A quartz crystal is a passive electromechanical resonator that exploits the piezoelectric effect of an AT-cut or BT-cut quartz blank. When inserted into an oscillator circuit, it provides a stable frequency reference whose accuracy is governed by the cut angle, the mechanical dimensions, and the load capacitance presented by the external oscillator stage. Crystals are classified as resonators under the broader category of frequency-control devices, which also includes ceramic resonators, SAW devices, MEMS oscillators, and TCXO/OCXO modules. Compared to ceramic resonators, quartz crystals offer 10-100x better frequency stability and tighter tolerance, which is why they remain the dominant timing reference in digital electronics.
Key features of the LFXTAL003156BULK include 8.0 MHz nominal frequency, 30 pF load capacitance rating, 40 ohm maximum ESR, ±30 ppm initial tolerance (at 25°C), and ±50 ppm stability over the operating temperature range. Aging is specified at 5 ppm per year, and the part is rated for operation from -20°C to +70°C. The through-hole HC-49/4H package is a vertically mounted, leaded format preferred for hobbyist, industrial, and educational designs where leaded components simplify prototyping, rework, and mechanical strain relief.
The crystal uses a fundamental-mode AT-cut quartz blank driven at its primary 8 MHz resonance, which avoids spurious overtone responses and simplifies oscillator loop design. The 30 pF load capacitance corresponds to a typical Pierce oscillator configuration with two external load capacitors of approximately 27 pF each (assuming 5 pF stray capacitance). At 40 ohms ESR, the part is well within the drive capability of virtually any modern microcontroller's internal Pierce oscillator.
Typical applications include microcontroller clock references for 8051, PIC, AVR, and STM8 devices, digital logic clock trees, USB-to-UART bridge circuits, simple UART baud-rate generators, and educational/development boards. The 8 MHz frequency is also useful as a system clock for 8-bit MCUs that derive lower internal frequencies via divider chains.
When designing with the LFXTAL003156BULK, place the crystal as close as possible to the oscillator pins of the IC and route the load capacitors symmetrically to ground. Keep the crystal traces short to minimize parasitic capacitance and stray pickup, and avoid routing noisy signal or power lines beneath the crystal can to prevent frequency pulling.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour LFXTAL003156BULK — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LFXTAL003156B
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LFXTAL003156REEL
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ABLS-8.000MHZ-B4-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ECS-80-S-4X
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
CM309S-8.000MABJTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ABL-8.000MHZ-B2
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LFXTAL003156BULK Spécifications
| Nominal Frequency | 8 MHz |
| Frequency Tolerance | ±30 ppm (at 25°C) |
| Frequency Stability | ±50 ppm |
| Load Capacitance | 30 pF |
| Equivalent Series Resistance (ESR) | 40 Ω |
| Operating Mode | Fundamental |
| Aging | 5 ppm/year |
| Température de fonctionnement | -20°C to +70°C |
| Boîtier | HC-49/4H (2-pin through-hole) |
| Package Dimensions | 11.05 x 4.7 x 4.1 mm |
| Type de montage | Through-Hole |
| Resonance Mode | Parallel |
| Nombre de broches | 2 |
| Statut RoHS | Compliant |
| Part Status | Active |
Configuration des broches de LFXTAL003156BULK
| Broche 1 | Crystal Pin 1 — Connects to XTAL1/OSC_IN of oscillator circuit (electrically symmetrical with pin 2) |
| Broche 2 | Crystal Pin 2 — Connects to XTAL2/OSC_OUT of oscillator circuit (electrically symmetrical with pin 1) |
Applications typiques
LFXTAL003156BULK convient pour 6 applications: 8-bit Microcontroller Clock Reference, UART Baud-Rate Generator Reference, Industrial Control and Hobby Electronics, Educational Development Boards, Legacy Replacement and Field Service, Digital Logic Clock and Pulse Generation.
8-bit Microcontroller Clock Reference
The LFXTAL003156BULK's 8 MHz nominal frequency, ±30 ppm tolerance, and 30 pF load capacitance make it a direct fit for the XTAL pins of 8-bit microcontrollers including 8051, PIC16/PIC18, AVR ATmega/ATtiny, and STM8 families. Modern MCU Pierce oscillator stages can drive the 40 Ω ESR with margin, and the 8 MHz fundamental is internally multiplied or divided to derive system clocks, peripheral timers, and UART baud rates. The HC-49/4H through-hole package is preferred for hand-reworkable prototype and low-volume designs. Engineers should place the crystal within 5 mm of the MCU's OSC pins and provide two 27-33 pF load capacitors to ground to hit the 30 pF effective load capacitance target.
Recommandé
UART Baud-Rate Generator Reference
At 8.000 MHz, the LFXTAL003156BULK serves as an accurate baud-rate reference for UART, SPI, and I2C peripherals that derive asynchronous serial bit timing from the system clock. The ±30 ppm tolerance over 0-70°C ensures standard baud rates from 9600 to 115200 remain within the ±2% receiver error budget even in thermally variable environments. The 40 Ω ESR is comfortably below the 100 Ω oscillator loop budget, leaving margin for additional board parasitic losses. For designs requiring tight RS-485 jitter at 1 Mbaud, the crystal's 5 ppm/year aging guarantees long-term accuracy without field recalibration.
Recommandé
Industrial Control and Hobby Electronics
The through-hole HC-49/4H package of the LFXTAL003156BULK is preferred in industrial control boards, PLC digital I/O modules, and hobby electronics where leaded components survive mechanical vibration, simplify hand-soldering, and ease field repair. The 8 MHz reference is used for low-speed logic, isolated RS-232/RS-485 transceivers, simple stepper-motor control loops, and discrete logic-clock generation. The -20°C to +70°C operating range covers most factory-floor enclosures and outdoor instrumentation cabinets. The 30 pF load capacitance matches legacy MCU reference designs from the 1990s-2000s that are still in production and on long lifecycle support.
Recommandé
Educational Development Boards
Universities, training labs, and makerspaces use the LFXTAL003156BULK as the clock reference on Arduino-clone boards, 8051 trainer kits, and breadboard-based microcontroller projects. The HC-49/4H form factor drops cleanly into 2.54 mm pitch perfboard and stripboard, and the 40 Ω ESR and 30 pF load are forgiving of long flying leads. The 8 MHz frequency is the native system clock of the original Arduino and is internally divided by 8 to drive the ATmega328P at 1 MHz in low-power mode. For learning labs, the visible metal can also serves as a tactile teaching aid for piezoelectric resonator principles.
Recommandé
Legacy Replacement and Field Service
The LFXTAL003156BULK is a direct modern replacement for end-of-life 8 MHz crystals from older product lines, including HC-49/4H parts from Fox Electronics, CTS, and ECS that have been discontinued or moved to long lead times. Field service technicians and contract manufacturers keep this part in stock to repair industrial controllers, test instruments, and embedded systems without redesigning the PCB. The 11.05 x 4.7 x 4.1 mm mechanical outline matches the original 1990s-2000s HC-49/4H footprint, so existing board artwork remains valid. The 30 pF load and ±30 ppm tolerance are the de-facto industry standards for this package.
Recommandé
Digital Logic Clock and Pulse Generation
The LFXTAL003156BULK can be paired with a 74HC4060 or CD4060 binary counter/divider to generate precise 1 Hz, 60 Hz, or 1 kHz clock outputs from the 8 MHz fundamental. This makes it useful for digital wall clocks, sequencer circuits, timer modules, and event counters in test equipment. The 30 pF load and 40 Ω ESR are compatible with CMOS Pierce oscillator gates including the CD4060's internal inverter stage. The ±30 ppm tolerance translates to ±7.2 seconds per day at 1 Hz, acceptable for non-networked digital timekeeping. Industrial equipment with battery backup RTCs can use this crystal as the main CPU reference while an external 32.768 kHz crystal handles real-time clocking.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LFXTAL003156BULK — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LFXTAL003156B | LFXTAL003156REEL | ABLS-8.000MHZ-B4-T | ECS-80-S-4X | CM309S-8.000MABJTR | ABL-8.000MHZ-B2 |
|---|---|---|---|---|---|---|---|
| Brand | IQD Frequency Products | IQD Frequency Products | IQD Frequency Products | Abracon | ECS Inc. | Citizen Finedevice | Abracon |
| Package | HC-49/4H (2-pin through-hole) | HC-49/4H (2-pin through-hole) - same | HC-49/4H (2-pin through-hole) - same | HC-49/US (2-pin through-hole) - same | HC-49/4H (2-pin through-hole) - same | HC-49/4H (2-pin through-hole) - same | HC-49/US (2-pin through-hole) - same |
| Nominal Frequency | 8.000 MHz | 8.000 MHz | 8.000 MHz | 8.000 MHz | 8.000 MHz | 8.000 MHz | 8.000 MHz |
| Frequency Tolerance | ±30 ppm | ±30 ppm | ±30 ppm | ±30 ppm | ±30 ppm | ±30 ppm | ±50 ppm |
| Load Capacitance | 30 pF | 30 pF | 30 pF | 18 pF | 30 pF | 18 pF | 18 pF |
| ESR | 40 Ω | 40 Ω | 40 Ω | 50 Ω | 60 Ω | 50 Ω | 50 Ω |
| Operating Mode | Fundamental | Fundamental | Fundamental | Fundamental | Fundamental | Fundamental | Fundamental |
Principaux différenciateurs
- Tighter 30 pF load capacitance than typical 18 pF industry default (vs ABLS-8.000MHZ-B4-T)
- Lower ESR than competing HC-49/4H 8 MHz crystals (vs ECS-80-S-4X)
- ±30 ppm tolerance vs typical ±50 ppm in same package (vs ABL-8.000MHZ-B2)
Notes de conception
Place the LFXTAL003156BULK within 5 mm of the microcontroller's XTAL1/XTAL2 pins. Use two load capacitors (typically 27-33 pF each for a 30 pF rated crystal) to ground on each terminal, with values calculated to give the effective load CL = (C1 × C2) / (C1 + C2) + Cstray. Keep crystal traces short and symmetric, and avoid routing any noisy signal or power lines beneath the metal can to prevent frequency pulling. Add a ground guard ring on the layer beneath the crystal if possible.
Do not use ceramic capacitors with poor temperature coefficients (NPO/C0G required). Do not exceed the maximum drive level (typically 100 µW for HC-49/4H); an oversized series resistor may be needed if the oscillator stage overdrives the crystal, which can cause aging and frequency drift. Do not assume pin 1 and pin 2 are interchangeable in marking-sensitive applications - while the device is electrically symmetric, some designs use pin 1 for case ground.
The HC-49/4H metal can is typically tied to one of the crystal pins internally; if the can is at ground potential, route pin 1 to ground and pin 2 to the oscillator output. The through-hole leads should be bent with a 1-2 mm standoff from the PCB to allow conformal coating and to reduce mechanical stress on the solder joints. For vibration-prone environments, add a small bead of RTV silicone between the crystal can and the PCB.
Informations de conformité
RoHS and REACH compliant per IQD product page and distributor listings. Not AEC-Q100 qualified - this is a general-purpose crystal, not an automotive-grade part. For AEC-Q100 qualified 8 MHz crystals, look at the IQD IQXC-180 series or the Abracon ABLS8-AUT family.
