RSS-1209 DC DC Converter 9V 1W Equivalent & Substitute Parts

Part Overview

The RSS-1209 is an isolated module DC DC converter manufactured by Recom Power, designed to convert input voltages in the 10.8V to 13.2V range to a regulated 9V output at 111mA maximum current. This 1W converter is classified as an Obsolete product, which necessitates identification of active equivalent alternatives for continued system support and procurement.

The RSS-1209 operates across a wide temperature range of -40°C to 85°C and is suitable for ITE (Commercial) applications. Its compact 8-SMD module form factor with 5 leads and surface mount capability make it suitable for space-constrained designs. The part incorporates short-circuit protection (SCP) and maintains 1 kV isolation voltage.

Key Parameters

Parameter	Value
Input Voltage Range	10.8V to 13.2V
Output Voltage	9V
Maximum Output Current	111mA
Power Rating	1W
Isolation Voltage	1 kV
Mounting Type	Surface Mount
Package Type	8-SMD Module, 5 Leads
Operating Temperature Range	-40°C to 85°C
Efficiency	78%
Protection Features	Short-Circuit Protection (SCP)
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the RSS-1209 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Input voltage range: 10.8V to 13.2V minimum
Output voltage: 9V
Output current capability: 111mA minimum
Power rating: 1W
Isolation voltage: 1 kV
Protection features: Short-circuit protection

Mechanical Equivalence Criteria:

Mounting type: Surface mount
Package configuration: 8-SMD Module, 5 Leads
Physical dimensions compatible with original footprint

Compliance Criteria:

RoHS3 compliance
REACH unaffected status
EAR99 classification

The R1S-1209 meets all electrical and mechanical substitution requirements while offering an active product status, making it a direct functional equivalent to the obsolete RSS-1209.

Parameter Comparison

Parameter	RSS-1209 (Main Part)	R1S-1209 (Substitute)	Compatibility
Manufacturer	Recom Power	Recom Power	Same
Input Voltage (Min)	10.8V	10.8V	Equivalent
Input Voltage (Max)	13.2V	13.2V	Equivalent
Output Voltage	9V	9V	Equivalent
Maximum Output Current	111mA	111mA	Equivalent
Power Rating	1W	1W	Equivalent
Isolation Voltage	1 kV	1 kV	Equivalent
Operating Temperature (Min)	-40°C	-40°C	Equivalent
Operating Temperature (Max)	85°C	100°C	R1S-1209 Extended Range
Efficiency	78%	78%	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Type	8-SMD Module, 5 Leads	8-SMD Module, 5 Leads	Equivalent
Protection Features	SCP	SCP	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The R1S-1209 is the direct substitute for the obsolete RSS-1209 based on the following engineering criteria:

Electrical Compatibility: The R1S-1209 maintains identical input voltage range (10.8V to 13.2V), output voltage (9V), output current (111mA), power rating (1W), and isolation voltage (1 kV). Both parts incorporate short-circuit protection and operate at 78% efficiency.

Mechanical Compatibility: Both parts utilize the same 8-SMD Module package with 5 leads and surface mount configuration. Physical dimensions are comparable, with the R1S-1209 measuring 12.8mm × 10.7mm × 7.0mm versus the RSS-1209 at 12.8mm × 8.2mm × 7.3mm. The dimensional variance is within acceptable tolerance for standard PCB footprints.

Regulatory Compliance: Both parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 classification, ensuring regulatory equivalence for ITE (Commercial) applications.

Product Status Advantage: The R1S-1209 holds active product status with current manufacturing and availability, whereas the RSS-1209 is obsolete. The R1S-1209 offers an extended maximum operating temperature of 100°C compared to the RSS-1209's 85°C, providing enhanced thermal margin for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the R1S-1209 be used as a direct replacement for the RSS-1209 in existing designs?

A: Yes. The R1S-1209 is electrically and mechanically equivalent to the RSS-1209 across all critical parameters: input voltage range, output voltage, output current, power rating, isolation voltage, and protection features. Both parts share identical package configuration and mounting type.

Q: What are the key differences between the RSS-1209 and R1S-1209?

A: The primary differences are product status and operating temperature range. The RSS-1209 is obsolete with a maximum operating temperature of 85°C, while the R1S-1209 is active with an extended maximum operating temperature of 100°C. Physical dimensions vary slightly (width: 8.2mm versus 10.7mm), but both maintain the same footprint compatibility for standard PCB designs.

Q: Are there any packaging differences between these parts?

A: The RSS-1209 is supplied in standard packaging, while the R1S-1209 is supplied in tube packaging. Both parts use the same 8-SMD Module, 5 Leads package type and are suitable for automated assembly processes.

Q: Does the R1S-1209 meet the same compliance requirements as the RSS-1209?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99. They are suitable for identical ITE (Commercial) applications.

Q: What is the moisture sensitivity level for these parts?

A: Both the RSS-1209 and R1S-1209 have a Moisture Sensitivity Level (MSL) of 1, indicating unlimited shelf life without moisture control requirements.

Q: Can the R1S-1209 handle higher temperatures than the RSS-1209?

A: Yes. The R1S-1209 operates across -40°C to 100°C, while the RSS-1209 operates across -40°C to 85°C. The R1S-1209 provides 15°C additional maximum temperature capability, suitable for applications requiring extended thermal performance.

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