Request Quote
(Ships tomorrow)
HC-49/U-S4000000ABKB Crystal Oscillator Equivalent & Substitute Parts
Part Overview
The HC-49/U-S4000000ABKB is a 4 MHz through-hole crystal oscillator manufactured by Citizen Finedevice Co Ltd. This fundamental mode crystal is designed for timing and frequency control applications requiring a 20pF load capacitance with 150 Ohms equivalent series resistance. The part is actively produced and ROHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts may be required due to inventory constraints, supply chain disruptions, or specific application requirements where load capacitance parameters differ within acceptable tolerances.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Frequency | 4 | MHz |
| Frequency Tolerance | ±30 | ppm |
| Frequency Stability | ±50 | ppm |
| Load Capacitance | 20 | pF |
| ESR (Equivalent Series Resistance) | 150 | Ohms |
| Operating Mode | Fundamental | — |
| Operating Temperature Range | -10 to 60 | °C |
| Mounting Type | Through Hole | — |
| Package / Case | HC-49/US | — |
| Size / Dimension | 11.50 x 4.66 | mm |
| Height - Seated (Max) | 4.60 | mm |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
The HC-49/U-S4000000ABJB qualifies as a direct substitute based on the following criteria:
Matching Parameters:
- Frequency: 4 MHz (identical)
- Frequency Tolerance: ±30 ppm (identical)
- Frequency Stability: ±50 ppm (identical)
- ESR: 150 Ohms (identical)
- Operating Mode: Fundamental (identical)
- Operating Temperature Range: -10°C to 60°C (identical)
- Mounting Type: Through Hole (identical)
- Package / Case: HC-49/US (identical)
- Physical Dimensions: 11.50mm x 4.66mm (identical)
- Height - Seated (Max): 4.60mm (identical)
- RoHS Status: ROHS3 Compliant (identical)
- MSL: 1 (Unlimited) (identical)
Differing Parameter:
- Load Capacitance: 18pF (substitute) vs. 20pF (main part)
The 2pF difference in load capacitance falls within acceptable substitution tolerance for HC-49/US series crystals, as both parts maintain identical frequency tolerance and stability specifications. The substitute part maintains all critical electrical and mechanical parameters required for functional equivalence in standard timing applications.
Parameter Comparison
| Parameter | HC-49/U-S4000000ABKB (Main) | HC-49/U-S4000000ABJB (Substitute) |
|---|---|---|
| Manufacturer | Citizen Finedevice Co Ltd | Citizen Finedevice Co Ltd |
| Frequency | 4 MHz | 4 MHz |
| Frequency Tolerance | ±30 ppm | ±30 ppm |
| Frequency Stability | ±50 ppm | ±50 ppm |
| Load Capacitance | 20 pF | 18 pF |
| ESR | 150 Ohms | 150 Ohms |
| Operating Mode | Fundamental | Fundamental |
| Operating Temperature | -10°C to 60°C | -10°C to 60°C |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | HC-49/US | HC-49/US |
| Size / Dimension | 11.50 x 4.66 mm | 11.50 x 4.66 mm |
| Height - Seated (Max) | 4.60 mm | 4.60 mm |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| MSL | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active |
Engineering Selection Recommendations
Both the HC-49/U-S4000000ABKB and HC-49/U-S4000000ABJB are active products manufactured by Citizen Finedevice Co Ltd and maintain identical ROHS3 compliance and REACH unaffected status. The parts are functionally equivalent for applications where the circuit design accommodates load capacitance values between 18pF and 20pF. Selection between these parts should be based on circuit-specific load capacitance requirements and inventory availability. Both parts carry MSL Level 1 (Unlimited) moisture sensitivity, eliminating moisture-related handling constraints during assembly and storage.
Frequently Asked Questions (FAQ)
Q: Can HC-49/U-S4000000ABJB replace HC-49/U-S4000000ABKB in my circuit?
A: Yes, provided your circuit design accommodates a load capacitance of 18pF. The 2pF difference does not affect frequency tolerance (±30 ppm) or stability (±50 ppm) specifications. Verify your oscillator circuit's load capacitance specification before substitution.
Q: What is the significance of the load capacitance difference?
A: Load capacitance determines the external capacitor values required in the oscillator circuit. A circuit designed for 20pF load capacitance may require adjustment of external load capacitors when using an 18pF crystal. Consult your circuit schematic and crystal manufacturer guidelines for proper capacitor selection.
Q: Are both parts physically interchangeable?
A: Yes. Both parts use the HC-49/US package with identical dimensions (11.50mm x 4.66mm) and maximum seated height (4.60mm). Through-hole mounting is identical, allowing direct PCB footprint compatibility.
Q: Do these parts have different compliance or certification status?
A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical MSL Level 1 (Unlimited) ratings. Compliance and handling requirements are identical.
Q: Which part should I select if both are available?
A: Selection depends on your circuit's load capacitance specification. If your design specifies 20pF load capacitance, use HC-49/U-S4000000ABKB. If your design specifies 18pF or accepts a range including 18pF, either part is suitable. Consult your circuit design documentation for the required load capacitance value.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts