ABM3B-24.000MHZ-B2-T - 24MHz 18pF 50Ω SMD Crystal | Abracon
MPN: ABM3B-24.000MHZ-B2-T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.46 | $0.46 |
| 10 | $0.42 | $4.20 |
| 100 | $0.36 | $36.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.27 | $270.00 |
ABM3B-24.000MHZ-B2-T Overview
A quartz crystal is a passive electromechanical resonator that exploits the piezoelectric effect of an AT-cut quartz blank to produce a stable reference frequency. Crystals belong to the broader category of frequency-control devices, which also includes MEMS oscillators, ceramic resonators, and SAW resonators. The role of a crystal in a system hierarchy is to provide a low-jitter, low-phase-noise clock reference for downstream frequency-control and timing ICs, synthesizers, and microcontrollers. The ABM3B-24.000MHZ-B2-T is a fundamental-mode, AT-cut crystal — a topology that minimizes cost and maximizes aging performance for frequencies up to about 50 MHz.
Key features that distinguish this part include its compact 5.0 x 3.2 mm industry-standard footprint, 50 Ω ESR that eases oscillator startup margin, and 18 pF load capacitance compatible with common low-power CMOS oscillator stages. The Pb-in-glass hermetic seal eliminates risk of moisture ingress during reflow and field operation, and the part is RoHS compliant. Frequency tolerance of ±20 ppm at 25 °C and stability of ±50 ppm over temperature make it suitable for consumer USB, industrial PLC, and embedded microcontroller designs.
Technically, the ABM3B uses a strip-fundamental AT-cut quartz blank operating at 24 MHz on its fundamental mode. The combination of low ESR (50 Ω max) and moderate motional capacitance allows wide-margin oscillation with standard Pierce oscillator circuits using standard 18 pF external load capacitors. Compared with 3rd-overtone parts, the fundamental-mode topology eliminates the need for a tank circuit and avoids the higher ESR typically seen at the 3rd OT, simplifying oscillator design.
Typical applications include USB 2.0 full-speed reference clocks, microcontroller clock inputs on STM32 and PIC platforms, industrial CAN/RS-485 node timing, consumer audio ADC/DAC master clocks, and PLC logic-controller clock trees. The 50 Ω ESR and 18 pF load make it a general-purpose drop-in for any 24 MHz reference design.
When designing with this part, ensure PCB pad pattern matches the 5.0 x 3.2 mm four-pad SMD land recommended in the ABM3B datasheet, and verify that the load capacitance of the surrounding Pierce oscillator (PCB stray + external caps) is close to 18 pF to keep ppm error low. Decoupling and ground integrity on the oscillator pins directly impact phase-noise performance.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical layout guidance that the bare manufacturer datasheet does not consolidate in one place.
Drop-in alternatives for ABM3B-24.000MHZ-B2-T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ABM3B-24.000MHZ-B-4-Y-T
✅ Drop-In📋 Reference alternative (not in catalog)
ECS-240-18-5PX-TR
✅ Drop-In📋 Reference alternative (not in catalog)
XRCGB24M000F2P00R0
✅ Drop-In📋 Reference alternative (not in catalog)
ABM3B-24.000MHZ-B2-T
✅ Drop-In✓ In Stock
$0.27 / Unit
View Datasheet →ABM3B-24.000MHZ-B2-T Specifications
| Manufacturer | Abracon |
| Series | ABM3B |
| Frequency | 24.000 MHz |
| Frequency Tolerance | ±20 ppm |
| Frequency Stability | ±50 ppm |
| Load Capacitance | 18 pF |
| Equivalent Series Resistance (ESR) | 50 Ω |
| Operating Mode | Fundamental |
| Cut Type | AT-cut |
| Operating Temperature | -40 °C to +85 °C |
| Package / Case | 4-SMD, No Lead (5.0 x 3.2 x 1.1 mm) |
| Mounting Type | Surface Mount |
| Termination Style | Solder Pad |
| Hermetic Seal | Yes (Pb in glass) |
| Reflow Capability | Yes (IR reflow compatible) |
| RoHS Status | Compliant |
| Part Status | Active |
ABM3B-24.000MHZ-B2-T Pin Configuration
| Pin 1 | Crystal Pin 1 — Crystal terminal connected to MCU/IC OSC_IN or OSC_OUT (per ABM3B datasheet) |
| Pin 2 | Case Ground — Case/ground pad — tie to PCB ground for mechanical stability and noise reduction |
| Pin 3 | Crystal Pin 2 — Crystal terminal paired with pin 1 to form the resonator |
| Pin 4 | Case Ground — Case/ground pad — tie to PCB ground |
Typical Applications
ABM3B-24.000MHZ-B2-T is suitable for 7 applications: USB 2.0 Reference Clock, Microcontroller Clock Reference, Industrial CAN / RS-485 Node Timing, Consumer Audio CODEC Master Clock, PLC Logic Controller Clock Tree, IoT Sensor Node Timekeeping, Embedded Serial Peripherals and Display Controllers.
USB 2.0 Reference Clock
The ABM3B-24.000MHZ-B2-T serves as the 24 MHz reference resonator for USB 2.0 full-speed transceivers in MCU peripherals and dedicated USB controllers. Per USB 2.0 spec, the device clock must be accurate to within ±2500 ppm; the ABM3B's ±20 ppm tolerance at 25 °C and ±50 ppm stability over -40 °C to +85 °C provide more than 50× margin against this spec. The 50 Ω ESR is comfortably within the startup-margin budget of typical USB-PHY Pierce oscillator stages. Placed between the MCU's OSC_IN/OSC_OUT pins with two 33 pF external caps to ground, the ABM3B yields a stable reference for downstream PLL multiplication to 480 MHz USB high-speed. Compared to a MEMS oscillator, the quartz crystal adds zero active current and has lower phase noise near the carrier — both useful for EMI compliance.
Recommended
Microcontroller Clock Reference
Generic MCU applications use the ABM3B-24.000MHZ-B2-T as the system clock reference for STM32, PIC, AVR, and MSP430 microcontrollers whose datasheet specifies a 24 MHz external crystal. The ±20 ppm tolerance combined with 18 pF load makes it a near-ideal match for the MCU's internal Pierce oscillator gain stage, eliminating any need for an external clock driver. With 50 Ω ESR, the negative-resistance margin is preserved even with long PCB traces or high stray capacitance. The 5.0 x 3.2 mm footprint is widely supported across MCU reference designs, and the -40 °C to +85 °C industrial operating range suits outdoor enclosures. Engineers should verify the total effective load (two external caps plus PCB stray) is within ±2 pF of the 18 pF rating to maintain frequency accuracy across production.
Recommended
Industrial CAN / RS-485 Node Timing
In industrial CAN and RS-485 communication nodes, the ABM3B-24.000MHZ-B2-T provides the 24 MHz timing base that the MCU's internal PLL multiplies to higher baud-rate clocks. CAN-FD bit-rate accuracy requires ±0.5% oscillator tolerance, which the ABM3B's ±50 ppm easily satisfies with 10× margin. The 5.0 x 3.2 mm package suits factory-automation enclosures with vibration exposure, and the Pb-in-glass hermetic seal protects against humidity ingress in outdoor cabinets. The 50 Ω ESR combined with typical 18 pF load allows design reuse across CAN, RS-485, and Modbus node variants without redesign. Compared to a MEMS oscillator at the same frequency, the quartz crystal provides tighter jitter performance and improved electromagnetic-compatibility behavior on long bus cables.
Recommended
Consumer Audio CODEC Master Clock
Audio CODEC master-clock inputs running at 24 MHz benefit from the ABM3B-24.000MHZ-B2-T's low jitter and tight tolerance. Audio master-clock jitter directly modulates onto the DAC output spectrum, raising the noise floor and degrading dynamic range — the ABM3B's AT-cut fundamental-mode topology yields lower close-to-carrier phase noise than 3rd-overtone or fundamental-mode parts with weaker ESR. The 18 pF load is compatible with common CODEC oscillator stages from Cirrus Logic, AKM, and TI. Over the -10 °C to +70 °C consumer operating window, the ±50 ppm stability holds frequency without audible pitch drift in sampling-rate-conversion paths. The 5.0 x 3.2 mm footprint fits standard consumer audio board layouts next to headphone-amp ICs.
Recommended
PLC Logic Controller Clock Tree
PLC logic controllers use the ABM3B-24.000MHZ-B2-T as the master reference clock feeding the MCU's PLL block, which then distributes phase-aligned clocks to digital I/O scan engines and analog ADC sample-and-hold logic. The ±20 ppm initial tolerance plus ±50 ppm drift over -40 °C to +85 °C ensures deterministic scan-cycle timing for ladder-logic execution. The 50 Ω ESR supports reliable startup even with the longer PCB traces typical of PLC backplane designs. The ceramic SMD package with Pb-in-glass seal withstands the wave-solder rework occasionally required in industrial-channel board repairs. The part's RoHS compliance supports modern PLC designs targeting IEC 61131-3 compliance and EU industrial-environment directives.
Recommended
IoT Sensor Node Timekeeping
Low-power IoT sensor nodes use the ABM3B-24.000MHZ-B2-T as the high-frequency reference that the MCU uses briefly to time-stamp sensor readings, then returns to a 32 kHz low-power crystal for sleep-mode timekeeping. The ABM3B's 50 Ω ESR and 18 pF load are compatible with most sub-GHz radio and BLE SoCs that expect a 24 MHz reference for radio PLL calibration. The 5.0 x 3.2 mm footprint suits compact sensor housings, and the industrial -40 °C to +85 °C range supports outdoor environmental-sensor deployments. Compared to an integrated MEMS oscillator, the discrete quartz crystal provides lower phase noise and tighter frequency tolerance — both important when calibrating narrow-band radio channels in dense IoT networks.
Recommended
Embedded Serial Peripherals and Display Controllers
Display controllers and serial peripherals such as SPI-bus expanders use the ABM3B-24.000MHZ-B2-T as the local timing reference for TFT-LCD timing generation and SPI clock-rate derivation. The 24 MHz fundamental mode allows integer division to common pixel-clock and SPI rates without residual ppm error beyond the crystal's own ±20 ppm tolerance. The 5.0 x 3.2 mm SMD footprint fits next to connector pins and FPC pads. The Pb-in-glass seal and IR-reflow capability support standard SMT production. With 50 Ω ESR and 18 pF load, this crystal provides stable startup across temperature for TFT bias-supply timing and backlight-PWM frequency generation. It is a cost-effective choice when sub-ppm stability is unnecessary.
Recommended
Recommended Products Summary
Engineering reference data for ABM3B-24.000MHZ-B2-T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ABM3B-24.000MHZ-B-4-Y-T | ABM3-24.000MHZ-B2-T | ECS-240-18-5PX-TR | XRCGB24M000F2P00R0 |
|---|---|---|---|---|---|
| Brand | Abracon | Abracon | Abracon | ECS Inc. | Murata |
| Package | 4-SMD 5.0 x 3.2 mm | 4-SMD 5.0 x 3.2 mm — same | 4-SMD 3.2 x 2.5 mm — smaller | 4-SMD 5.0 x 3.2 mm — same | 4-SMD 5.0 x 3.2 mm — same |
| Frequency | 24.000 MHz | 24.000 MHz | 24.000 MHz | 24.000 MHz | 24.000 MHz |
| Frequency Tolerance | ±20 ppm | ±30 ppm | ±20 ppm | ±30 ppm | ±20 ppm |
| Frequency Stability | ±50 ppm | ±50 ppm | ±50 ppm | ±50 ppm | ±25 ppm |
| Load Capacitance | 18 pF | 18 pF | 18 pF | 18 pF | 8 pF |
| ESR | 50 Ω | 50 Ω | 60 Ω (higher) | 50 Ω | 60 Ω |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Operating Mode | Fundamental | Fundamental | Fundamental | Fundamental | Fundamental |
Key Differentiators
- Wider operating-temperature envelope than typical consumer crystals (vs ECS-240-18-5PX-TR)
- Lower ESR on the 5.0x3.2 mm footprint than the smaller ABM3 (vs ABM3-24.000MHZ-B2-T)
- Industry-standard 18 pF load matches MCU reference designs (vs XRCGB24M000F2P00R0)
Design Notes
Place the ABM3B-24.000MHZ-B2-T as close as physically possible to the MCU's OSC_IN and OSC_OUT pins to minimize trace stray capacitance and reduce EMI pickup. The four-pad SMD footprint uses pads 1 and 3 as the crystal terminals and pads 2 and 4 as case ground — tie pads 2 and 4 to a low-impedance ground plane beneath the part. Keep digital signal traces away from the crystal pins to avoid injecting noise into the oscillator loop. A guard ring around the crystal connected to ground further isolates the resonator from adjacent switching signals.
Do not select external load capacitors arbitrarily. The ABM3B-24.000MHZ-B2-T is specified at 18 pF load; the two external caps plus PCB stray (typically 2–5 pF) must combine to 18 pF. A common error is using 22 pF caps which yields CL ~ 12–13 pF and pulls the oscillator off-frequency by tens of ppm. Use NPO/C0G ceramic capacitors (not X7R) to maintain low-loss and stable loading across temperature. Verify actual oscillator frequency with a frequency counter on first prototypes — calculate ppm error as (f_measured - 24,000,000) / 24 ppm.
Although ABM3B-24.000MHZ-B2-T is a passive resonator and not an EMI source, the oscillator loop including the MCU's internal inverter is sensitive to nearby fast edges. Route USB differential pairs, RF traces, and high-current switching traces at least 5 mm away from the crystal. Place a small ferrite bead or 10 Ω resistor in series with the MCU's power pin near the oscillator section if the oscillator shows supply-noise modulation on the output spectrum. The 50 Ω ESR combined with typical Pierce oscillator gain provides adequate startup margin under clean supply conditions.
Compliance Information
RoHS compliant per Abracon product page. Quartz crystals are not subject to AEC-Q100 qualification (passive component). Pb-in-glass seal is hermetic and exempt from RoHS lead-phasing under current IEC directives.