LLSD103A-7 Equivalent & Substitute Parts

Part Overview

The LLSD103A-7 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage with 350 mA average rectified current. The device is packaged in a Mini MELF (DO-213AC, SOD-80) surface mount configuration and operates across a junction temperature range of -55°C to 125°C. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	350	mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	mV @ mA
Reverse Recovery Time (trr)	10	ns
Current - Reverse Leakage @ Vr	5	µA @ 30 V
Technology	Schottky	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LLSD103A-7 is determined by strict equivalence across the following electrical parameters: voltage rating (40 V DC reverse), current rating (350 mA average rectified), forward voltage characteristics (600 mV @ 200 mA), and switching speed (fast recovery ≤ 500 ns for currents > 200 mA). Mechanical compatibility is established through surface mount technology and package form factor.

Substitute parts are grouped into two categories:

Category A: Direct Electrical and Package Equivalents Parts maintaining identical electrical specifications and Mini MELF packaging: TMMBAT48FILM (STMicroelectronics).

Category B: Electrical Equivalents with Alternative Packaging Parts maintaining identical electrical specifications but utilizing SOD-123 surface mount packaging: SD103AW-13-F and SD103AW-7-F (both Diodes Incorporated).

Category C: Partial Electrical Equivalents Parts with matching voltage and package form but reduced current rating: LL101C-GS18 (Vishay General Semiconductor - Diodes Division), rated for 30 mA instead of 350 mA.

Parameter Comparison

Parameter	LLSD103A-7	SD103AW-13-F	SD103AW-7-F	TMMBAT48FILM	LL101C-GS18
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	STMicroelectronics	Vishay General Semiconductor
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	350 mA	350 mA	350 mA	350 mA	30 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	600 mV @ 200 mA	600 mV @ 200 mA	750 mV @ 200 mA	900 mV @ 15 mA
Reverse Recovery Time (trr)	10 ns	10 ns	10 ns	10 ns	1 ns
Current - Reverse Leakage @ Vr	5 µA @ 30 V	5 µA @ 30 V	5 µA @ 30 V	25 µA @ 40 V	200 nA @ 30 V
Capacitance @ Vr, F	50 pF @ 0V, 1MHz	28 pF @ 0V, 1MHz	28 pF @ 0V, 1MHz	20 pF @ 0V, 1MHz	2.2 pF @ 0V, 1MHz
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	SOD-123	DO-213AA (Glass), Mini MELF	DO-213AC, MINI-MELF, SOD-80
Operating Temperature - Junction	-55 to 125°C	-65 to 125°C	-65 to 125°C	-65 to 125°C	Max 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Package Specifications)

The TMMBAT48FILM (STMicroelectronics) provides full electrical equivalence with the LLSD103A-7, maintaining 40 V reverse voltage, 350 mA current rating, 10 ns reverse recovery time, and Mini MELF packaging. This part is active in production status with ROHS3 compliance and REACH unaffected status. The forward voltage specification of 750 mV @ 200 mA represents a 150 mV increase over the original part; this differential must be evaluated within the specific circuit application. Inventory availability is substantial at 75,300 pieces.

For Electrical Equivalence with Package Transition

The SD103AW-13-F and SD103AW-7-F (Diodes Incorporated) maintain complete electrical equivalence to the LLSD103A-7 across all critical parameters: 40 V reverse voltage, 350 mA current, 600 mV forward voltage @ 200 mA, and 10 ns reverse recovery time. Both parts transition from Mini MELF to SOD-123 surface mount packaging. SD103AW-7-F offers significantly higher inventory (20,400 pieces) compared to SD103AW-13-F (4,099 pieces). Both parts are active in production with ROHS3 compliance and REACH unaffected status. Package transition requires PCB layout modification.

For Current-Limited Applications

The LL101C-GS18 (Vishay General Semiconductor - Diodes Division) maintains 40 V reverse voltage and Mini MELF packaging but is rated for 30 mA average rectified current, representing a 91.4% reduction from the original 350 mA specification. This part is suitable only for applications where the circuit current requirement does not exceed 30 mA. The part carries AEC-Q101 automotive qualification and is active in production status with ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can the SD103AW-13-F or SD103AW-7-F be used as direct drop-in replacements for the LLSD103A-7?

A: Electrical substitution is complete; however, mechanical substitution requires PCB layout modification. The SD103AW series uses SOD-123 packaging while the LLSD103A-7 uses Mini MELF (SOD-80). Footprint, pad spacing, and component height differ between these packages. Schematic-level substitution is valid; board-level implementation requires layout revision.

Q: What is the significance of the forward voltage difference between TMMBAT48FILM (750 mV) and LLSD103A-7 (600 mV)?

A: The 150 mV increase in forward voltage drop at 200 mA represents approximately 25% higher voltage dissipation at this current level. In low-voltage applications or high-current scenarios, this differential may impact circuit efficiency and thermal performance. Circuit simulation or bench testing is necessary to confirm acceptability within the specific application context.

Q: Is the LL101C-GS18 suitable for all applications using the LLSD103A-7?

A: No. The LL101C-GS18 is rated for 30 mA average rectified current compared to the LLSD103A-7 rating of 350 mA. This part is suitable only for applications where the maximum circuit current does not exceed 30 mA. Exceeding this current rating will result in device failure or degraded performance.

Q: What is the impact of REACH status differences between substitute parts?

A: The LLSD103A-7 is listed as REACH Affected, while all substitute parts (SD103AW-13-F, SD103AW-7-F, TMMBAT48FILM, and LL101C-GS18) are REACH Unaffected. REACH Unaffected status indicates the part does not contain substances of very high concern (SVHC) on the candidate list. For applications subject to REACH compliance requirements, the substitute parts provide regulatory advantage.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The LLSD103A-7 and all four substitute parts (SD103AW-13-F, SD103AW-7-F, TMMBAT48FILM, and LL101C-GS18) are ROHS3 compliant. All parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Q: Which substitute part offers the best inventory availability?

A: The TMMBAT48FILM (STMicroelectronics) offers the highest inventory level at 75,300 pieces. The SD103AW-7-F (Diodes Incorporated) provides the second-highest availability at 20,400 pieces. Both parts are suitable for high-volume production requirements.

Q: Does the LL101C-GS18 offer any advantages despite its lower current rating?

A: The LL101C-GS18 provides AEC-Q101 automotive qualification, making it suitable for automotive applications requiring formal qualification status. The part also exhibits superior reverse recovery time (1 ns versus 10 ns) and significantly lower reverse leakage current (200 nA versus 5 µA), characteristics beneficial in precision switching applications operating below 30 mA.

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