9HT7-32.768KDZC-T Equivalent & Substitute Parts

Part Overview

The 9HT7-32.768KDZC-T is a 32.768 kHz tuning fork crystal manufactured by TXC CORPORATION, designed for real-time clock (RTC) and timing applications requiring fundamental mode operation. This surface mount device operates across the industrial temperature range of -40°C to 85°C with a frequency tolerance of ±20ppm and load capacitance of 9pF. The part is RoHS compliant with MSL 1 rating, indicating unlimited shelf life under controlled conditions. As an active product with 1047 units in stock, equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific requirements.

Key Parameters

Parameter	Value	Significance for Substitution
Frequency	32.768 kHz	Must match exactly for timing accuracy
Frequency Tolerance	±20ppm	Determines initial accuracy; all substitutes must meet or exceed this specification
Load Capacitance	9pF	Critical for circuit matching; affects oscillator tuning and stability
ESR (Equivalent Series Resistance)	65 kOhms	Determines drive level requirements and circuit compatibility
Operating Mode	Fundamental	Must remain fundamental mode; no overtone operation
Operating Temperature Range	-40°C to 85°C	Defines environmental operating limits
Package / Case	4-SMD, Flat Leads	Physical footprint and mounting compatibility
Size / Dimension	0.264" L x 0.055" W (6.70mm x 1.40mm)	PCB layout and placement constraints
Mounting Type	Surface Mount	Assembly process compatibility
RoHS Status	RoHS Compliant	Regulatory and environmental compliance requirement
MSL Rating	1 (Unlimited)	Storage and handling requirements

Substitute Part Grouping Explanation

Substitution logic for the 9HT7-32.768KDZC-T is based on strict electrical and mechanical parameter matching. All substitute parts must satisfy the following criteria:

Primary Matching Criteria:

Frequency: 32.768 kHz (exact match required)
Frequency Tolerance: ±20ppm (minimum requirement)
ESR: 65 kOhms (exact match required)
Operating Mode: Fundamental
Operating Temperature Range: -40°C to 85°C (minimum requirement)
Package / Case: 4-SMD, Flat Leads
Mounting Type: Surface Mount
RoHS Compliance: Required

Secondary Consideration:

Load Capacitance: 9pF (primary specification) or 7pF (parametric equivalent with circuit design adjustment)

Substitutes are grouped into two categories:

Category 1 - Direct Substitutes (9pF Load Capacitance): Parts with identical load capacitance (9pF) require no circuit modification and provide drop-in replacement capability. These include EPSON MC-146 series variants, Raltron RSE-32.768-9-H14-TR, and Seiko Instruments SSPT7F-9PF20-R.

Category 2 - Parametric Equivalents (7pF Load Capacitance): Parts with 7pF load capacitance (TXC 9HT7-32.768KDZY-T and Citizen CM13032768DZYT) require circuit design verification and potential tuning capacitor adjustment to maintain frequency accuracy and stability within the specified tolerance band.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency (kHz)	Load Capacitance (pF)	ESR (kOhms)	Frequency Tolerance (ppm)	Operating Temperature (°C)	Package	Size L x W (mm)	RoHS Status	Inventory (Pcs)
9HT7-32.768KDZC-T	TXC CORPORATION	32.768	9	65	±20	-40 to 85	4-SMD, Flat Leads	6.70 x 1.40	RoHS Compliant	1047
9HT7-32.768KDZY-T	TXC CORPORATION	32.768	7	65	±20	-40 to 85	4-SMD, Flat Leads	6.70 x 1.40	ROHS3 Compliant	4897
CM13032768DZYT	Citizen Finedevice Co Ltd	32.768	7	65	±20	-40 to 85	4-SMD, Flat Leads	6.70 x 1.40	ROHS3 Compliant	3884
MC-146 32.7680KA-AC0: ROHS	EPSON	32.768	9	65	±20	-40 to 85	4-SMD, Flat Leads	6.70 x 1.50	ROHS3 Compliant	2023
MC-146 32.7680KA-AC0:PURE SN	EPSON	32.768	9	65	±20	-40 to 85	4-SMD, Flat Leads	6.70 x 1.50	ROHS3 Compliant	2120
MC-146 32.7680KA-AC3:ROHS	EPSON	32.768	9	65	±20	-40 to 85	4-SMD, Flat Leads	6.70 x 1.50	ROHS3 Compliant	136461
MC-146 32.7680KA-AG0: ROHS	EPSON	32.768	7	65	±20	-40 to 85	4-SMD, Flat Leads	6.70 x 1.50	ROHS3 Compliant	20977
RSE-32.768-9-H14-TR	Raltron Electronics	32.768	9	65	±20	-40 to 85	4-SMD, Flat Leads	6.70 x 1.40	ROHS3 Compliant	3763
SSPT7F-9PF20-R	Seiko Instruments	32.768	9	65	±20	-40 to 85	4-SMD, Flat Leads	6.70 x 1.40	ROHS3 Compliant	13507

Engineering Selection Recommendations

Direct Substitutes (No Circuit Modification Required):

The following parts provide direct substitution with identical electrical specifications and 9pF load capacitance:

MC-146 32.7680KA-AC3:ROHS (EPSON): Highest inventory availability (136,461 units) with ROHS3 compliance and REACH affected status. Suitable for high-volume production requirements.
SSPT7F-9PF20-R (Seiko Instruments): 13,507 units in stock with ROHS3 compliance and REACH unaffected status. Recommended for applications with REACH compliance priority.
RSE-32.768-9-H14-TR (Raltron Electronics): 3,763 units available with ROHS3 compliance and REACH unaffected status. Suitable for applications requiring alternative sourcing.
MC-146 32.7680KA-AC0: ROHS (EPSON): 2,023 units in stock with ROHS3 compliance. Provides secondary EPSON sourcing option.
MC-146 32.7680KA-AC0:PURE SN (EPSON): 2,120 units available with ROHS3 compliance. Tin-lead variant for specific assembly process requirements.

Parametric Equivalents (Circuit Design Verification Required):

The following parts require circuit design review and potential tuning capacitor adjustment due to 7pF load capacitance specification:

9HT7-32.768KDZY-T (TXC CORPORATION): 4,897 units in stock with ROHS3 compliance. Same manufacturer as primary part; same physical footprint (6.70mm x 1.40mm).
MC-146 32.7680KA-AG0: ROHS (EPSON): 20,977 units available with ROHS3 compliance and highest inventory among 7pF variants. Requires circuit tuning verification.
CM13032768DZYT (Citizen Finedevice Co Ltd): 3,884 units in stock with ROHS3 compliance and REACH affected status.

Selection Criteria by Application Priority:

Supply Chain Continuity: MC-146 32.7680KA-AC3:ROHS (highest inventory)
Regulatory Compliance (REACH Unaffected): SSPT7F-9PF20-R or RSE-32.768-9-H14-TR
Single Manufacturer Sourcing: 9HT7-32.768KDZY-T (TXC CORPORATION)
Cost Optimization: Evaluate 7pF parametric equivalents with circuit design adjustment

Frequently Asked Questions (FAQ)

Q1: Can I use a 7pF load capacitance crystal as a direct replacement for the 9pF specification?

A: No. The 7pF load capacitance (9HT7-32.768KDZY-T, CM13032768DZYT, MC-146 32.7680KA-AG0: ROHS) requires circuit design verification and potential tuning capacitor adjustment. The oscillator circuit must be re-tuned to maintain frequency accuracy within the ±20ppm tolerance band. Direct substitution without circuit modification may result in frequency drift outside specification limits.

Q2: What is the difference between the EPSON MC-146 variants (AC0, AC3, AG0)?

A: The MC-146 variants differ in load capacitance and manufacturing specifications. AC0 and AC3 variants feature 9pF load capacitance (direct substitutes), while AG0 features 7pF load capacitance (parametric equivalent). The AC0:PURE SN variant indicates pure tin solder finish for specific assembly processes. All variants share identical frequency, ESR, temperature range, and RoHS3 compliance.

Q3: Are there physical footprint differences between substitute parts?

A: Yes. The primary part (9HT7-32.768KDZC-T) and most substitutes measure 6.70mm x 1.40mm. However, EPSON MC-146 series parts measure 6.70mm x 1.50mm (0.10mm wider). Verify PCB layout constraints before substitution. The height specification (1.40mm seated maximum) is consistent across all parts.

Q4: Which substitute part has the best inventory availability?

A: MC-146 32.7680KA-AC3:ROHS (EPSON) has the highest inventory with 136,461 units in stock. This part provides direct substitution with 9pF load capacitance and ROHS3 compliance, suitable for high-volume production or long-term supply security.

Q5: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All listed substitute parts are RoHS3 compliant. The primary part is RoHS compliant. For applications requiring REACH compliance verification, SSPT7F-9PF20-R (Seiko Instruments) and RSE-32.768-9-H14-TR (Raltron Electronics) are listed as REACH unaffected. EPSON and Citizen parts are listed as REACH affected.

Q6: What is the MSL (Moisture Sensitivity Level) rating for all parts?

A: All parts carry MSL 1 rating, indicating unlimited shelf life under controlled storage conditions (≤30°C, ≤85% relative humidity). No baking or special moisture handling procedures are required prior to assembly.

Q7: Can I mix different manufacturers' crystals in the same production batch?

A: Yes, provided all parts meet identical electrical specifications (32.768 kHz, ±20ppm tolerance, 9pF load capacitance, 65 kOhms ESR, fundamental mode, -40°C to 85°C operating range). However, for consistency and traceability, maintain single-manufacturer sourcing within individual production lots when possible.

Q8: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel (TR) packaging is supplied on continuous carrier tape wound on reels, suitable for automated pick-and-place assembly. Cut Tape (CT) is supplied in shorter tape segments for manual or lower-volume assembly. RSE-32.768-9-H14-TR is available in both formats. Verify packaging compatibility with assembly equipment before ordering.

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