Equivalent & Substitute Parts for C1608JB1C684M080AA

Part Overview

The C1608JB1C684M080AA is a 0.68 µF ±20% 16V ceramic capacitor manufactured by TDK Corporation in 0603 (1608 Metric) package with JB temperature coefficient. This part is designated as Last Time Buy, indicating end-of-life status. Equivalent and substitute parts are necessary to ensure design continuity and procurement flexibility for applications requiring 0.68 µF capacitance at 16V or higher voltage ratings with compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
Capacitance	0.68 µF
Tolerance	±20%
Voltage Rating	16V
Temperature Coefficient	JB
Operating Temperature Range	-25°C ~ 85°C
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount, MLCC
Size	0.063" L x 0.031" W (1.60mm x 0.80mm)
Thickness (Max)	0.035" (0.90mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for C1608JB1C684M080AA is determined by the following criteria:

Primary Substitution Parameters:

Capacitance: 0.68 µF (exact match required)
Package / Case: 0603 (1608 Metric) (exact match required)
Mounting Type: Surface Mount, MLCC (exact match required)
Voltage Rating: 16V minimum (equal or higher voltage ratings are acceptable)
Temperature Coefficient: JB or X5R (both acceptable for general purpose applications)
Tolerance: ±10% or ±20% (both acceptable; ±10% provides tighter tolerance)
Operating Temperature: -25°C ~ 85°C or wider range acceptable
RoHS Status: ROHS3 Compliant (required)
Moisture Sensitivity Level: 1 (Unlimited) (required)

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (JB Temperature Coefficient, 16V-35V) Parts with JB temperature coefficient and voltage ratings from 16V to 35V maintain identical thermal characteristics while offering improved voltage margin or tolerance specifications.

Category 2: Manufacturer Recommended Alternatives (X5R Temperature Coefficient, 16V-25V) Parts with X5R temperature coefficient provide wider operating temperature range (-55°C ~ 85°C) and are designated as manufacturer-recommended alternatives, though marked as Not For New Designs.

Parameter Comparison

Part Number	Capacitance	Tolerance	Voltage	Temp Coeff	Temp Range	Package	Status	Inventory
C1608JB1C684M080AA	0.68 µF	±20%	16V	JB	-25°C ~ 85°C	0603	Last Time Buy	8914 Pcs
C1608JB1C684K080AA	0.68 µF	±10%	16V	JB	-25°C ~ 85°C	0603	Last Time Buy	9250 Pcs
C1608JB1E684K080AC	0.68 µF	±10%	25V	JB	-25°C ~ 85°C	0603	Last Time Buy	1969 Pcs
C1608JB1E684M080AC	0.68 µF	±20%	25V	JB	-25°C ~ 85°C	0603	Last Time Buy	4451 Pcs
C1608JB1H684K080AB	0.68 µF	±10%	50V	JB	-25°C ~ 85°C	0603	Last Time Buy	4250 Pcs
C1608JB1H684M080AB	0.68 µF	±20%	50V	JB	-25°C ~ 85°C	0603	Last Time Buy	1237 Pcs
C1608JB1V684K080AB	0.68 µF	±10%	35V	JB	-25°C ~ 85°C	0603	Last Time Buy	4255 Pcs
C1608JB1V684M080AB	0.68 µF	±20%	35V	JB	-25°C ~ 85°C	0603	Last Time Buy	4821 Pcs
C1608X5R1C684K080AA	0.68 µF	±10%	16V	X5R	-55°C ~ 85°C	0603	Not For New Designs	4602 Pcs
C1608X5R1C684M080AA	0.68 µF	±20%	16V	X5R	-55°C ~ 85°C	0603	Not For New Designs	993 Pcs
C1608X5R1E684K080AC	0.68 µF	±10%	25V	X5R	-55°C ~ 85°C	0603	Not For New Designs	6029 Pcs

Engineering Selection Recommendations

For Direct Replacement (Same Thermal Characteristics): Select C1608JB1C684K080AA when tolerance improvement to ±10% is acceptable and 16V rating is sufficient. This part maintains identical JB temperature coefficient and operating temperature range while providing tighter capacitance tolerance.

For Voltage Margin Enhancement: Select C1608JB1E684M080AC (25V) or C1608JB1V684M080AB (35V) when circuit design permits higher voltage ratings. These parts provide additional voltage safety margin while maintaining ±20% tolerance and JB temperature coefficient. The 25V option offers better inventory availability (4451 Pcs).

For Tolerance and Voltage Optimization: Select C1608JB1E684K080AC (25V, ±10%) or C1608JB1V684K080AB (35V, ±10%) when both improved tolerance and voltage margin are required. These combinations provide the most robust electrical specifications within the JB temperature coefficient family.

For Extended Temperature Range (Legacy Designs Only): C1608X5R1C684K080AA or C1608X5R1C684M080AA provide -55°C ~ 85°C operating range with X5R temperature coefficient. These parts are designated Not For New Designs and should be used only when legacy design compatibility is mandatory.

All substitute parts maintain ROHS3 compliance, MSL 1 (Unlimited) rating, and 0603 package compatibility with the original C1608JB1C684M080AA.

Frequently Asked Questions (FAQ)

Q: Can I use a 25V or 35V rated capacitor in place of the 16V C1608JB1C684M080AA? A: Yes. Higher voltage-rated capacitors are electrically compatible substitutes. A 25V or 35V rated capacitor will function correctly in a 16V circuit application. The higher voltage rating provides additional safety margin and does not affect circuit performance when capacitance and tolerance specifications match.

Q: What is the difference between ±10% and ±20% tolerance? A: Tolerance specifies the allowable deviation from the nominal 0.68 µF capacitance value. ±20% allows deviation from 0.544 µF to 0.816 µF, while ±10% allows deviation from 0.612 µF to 0.748 µF. Applications requiring tighter capacitance control should specify ±10% tolerance parts.

Q: Are JB and X5R temperature coefficients interchangeable? A: Both JB and X5R temperature coefficients are acceptable for general purpose applications. JB provides -25°C ~ 85°C operating range, while X5R provides -55°C ~ 85°C. Select based on application temperature requirements. X5R parts are marked Not For New Designs and should be used only for legacy design compatibility.

Q: Does packaging format (Cut Tape vs. Tape & Reel) affect electrical performance? A: No. Packaging format affects only procurement and handling logistics. Cut Tape (CT) and Tape & Reel (TR) formats contain identical components with identical electrical specifications. Selection depends on assembly process requirements and order quantities.

Q: Are all listed parts ROHS3 compliant? A: Yes. All parts listed in this reference are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting regulatory requirements for commercial and industrial applications.

Q: What inventory considerations apply to part selection? A: C1608JB1C684K080AA offers the highest inventory (9250 Pcs) among direct JB equivalents. C1608JB1E684M080AC (4451 Pcs) provides good availability for 25V applications. X5R alternatives show lower inventory levels, with C1608X5R1E684K080AC at 6029 Pcs being the most available in that category.

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