BT169D-L,112 Equivalent & Substitute Parts

Part Overview

The BT169D-L,112 is a 400V 800mA sensitive gate SCR (Silicon Controlled Rectifier) manufactured by WeEn Semiconductors in TO-92-3 through-hole packaging. This thyristor is designed for AC switching and control applications requiring low gate trigger current and voltage. The part is currently active in production with 956 units in stock.

Substitute parts are necessary when the original BT169D-L,112 becomes unavailable, when alternative packaging formats are required, or when sourcing from multiple manufacturers is needed for supply chain resilience. The substitute parts listed maintain electrical compatibility within the specified parameter ranges while offering different packaging options and availability levels.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	400	V
Voltage - Gate Trigger (Vgt) Max	800	mV
Current - Gate Trigger (Igt) Max	50	µA
Voltage - On State (Vtm) Max	1.7	V
Current - On State (It RMS) Max	800	mA
Current - Hold (Ih) Max	5	mA
SCR Type	Sensitive Gate	-
Mounting Type	Through Hole	-
Package / Case	TO-226-3, TO-92-3	-
RoHS Status	RoHS Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the BT169D-L,112 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - Off State: 400V (exact match required)
Voltage - Gate Trigger (Vgt) Max: 800mV (exact match required)
Current - On State (It RMS) Max: 800mA (exact match or higher acceptable)
SCR Type: Sensitive Gate (exact match required)
Package / Case: TO-92-3 or TO-226-3 (mechanical compatibility required)

Acceptable Variations:

Current - Gate Trigger (Igt) Max: Values from 5µA to 200µA are acceptable (lower values indicate more sensitive gate triggering)
Voltage - On State (Vtm) Max: Values up to 1.95V are acceptable (affects forward voltage drop)
Current - On State (It AV) Max: Values from 500mA to 510mA are acceptable
Operating Temperature Range: Extended ranges are acceptable
Packaging Format: Tube, Bulk, Cut Tape, and Tape & Reel formats are interchangeable for the same electrical component
RoHS Status: Both RoHS Compliant and ROHS3 Compliant are acceptable

All substitute parts listed meet these criteria and maintain functional equivalence with the BT169D-L,112.

Parameter Comparison

Part Number	Manufacturer	Voff (V)	Vgt Max (mV)	Igt Max (µA)	Vtm Max (V)	It RMS Max (mA)	Ih Max (mA)	Package	Status
BT169D-L,112	WeEn Semiconductors	400	800	50	1.7	800	5	TO-92-3	Active
2N6565	Littelfuse Inc.	400	800	200	1.7	800	5	TO-92-3	Active
EC103D	Littelfuse Inc.	400	800	200	1.7	800	5	TO-92-3	Active
EC103D1	Littelfuse Inc.	400	800	12	1.7	800	5	TO-92-3	Active
EC103D2RP	Littelfuse Inc.	400	800	50	1.7	800	5	TO-92-3	Active
EC103DRP	Littelfuse Inc.	400	800	200	1.7	800	5	TO-92-3	Active
P0102DA 1AA3	STMicroelectronics	400	800	200	1.95	800	5	TO-92-3	Active
P0102DA 2AL3	STMicroelectronics	400	800	200	1.95	800	5	TO-92-3	Active
P0102DA 5AL3	STMicroelectronics	400	800	200	1.95	800	5	TO-92-3	Active
P0118DA 5AL3	STMicroelectronics	400	800	5	1.95	800	5	TO-92-3	Obsolete

Engineering Selection Recommendations

Primary Substitutes (Active Status, Highest Compatibility):

EC103D2RP and 2N6565 provide the closest electrical match to the BT169D-L,112. EC103D2RP matches the gate trigger current specification (50µA) identically and is available in Tape & Reel packaging. The 2N6565 from Littelfuse offers 2300 units in stock with ROHS3 compliance and extended operating temperature range (-40°C to 110°C).

Secondary Substitutes (Active Status, Minor Parameter Variations):

EC103D and EC103DRP from Littelfuse maintain all critical electrical parameters with gate trigger current at 200µA. EC103D offers the highest inventory (25,300 units) and is suitable for applications where slightly higher gate trigger current is acceptable. EC103D1 provides the lowest gate trigger current (12µA) among Littelfuse options, offering enhanced gate sensitivity.

STMicroelectronics Options (Active Status):

P0102DA series parts (1AA3, 2AL3, 5AL3) are available in multiple packaging formats with higher on-state voltage (1.95V maximum) compared to the BT169D-L,112 (1.7V maximum). These parts are suitable for applications where the additional voltage drop is acceptable. P0102DA 5AL3 provides the largest inventory (35,300 units) in Cut Tape format.

Obsolete Part:

P0118DA 5AL3 is marked as obsolete and should not be selected for new designs despite its availability (2400 units in stock).

Packaging Considerations:

All substitute parts maintain TO-92-3 through-hole packaging compatibility. Packaging format variations (Tube, Bulk, Cut Tape, Tape & Reel) do not affect electrical function and are selected based on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can I use EC103D as a direct replacement for BT169D-L,112?

A: Yes. EC103D maintains all critical electrical parameters: 400V off-state voltage, 800mV gate trigger voltage, 800mA RMS current rating, and TO-92-3 packaging. The gate trigger current is 200µA compared to the original 50µA, which is acceptable as it remains within the sensitive gate classification.

Q: What is the difference between EC103D2RP and EC103D?

A: Both parts are electrically identical with 400V, 800mV gate trigger voltage, and 800mA RMS rating. EC103D2RP is packaged in Tape & Reel (TR) format with formed leads, while EC103D is supplied in Bulk format. EC103D2RP's gate trigger current matches the BT169D-L,112 at 50µA, whereas EC103D is rated at 200µA.

Q: Why is the P0102DA series on-state voltage higher (1.95V vs 1.7V)?

A: The P0102DA series from STMicroelectronics has a higher maximum on-state voltage specification. This represents a different manufacturing process or design variant. The part remains functionally equivalent for switching applications, though it will dissipate slightly more power during conduction. Verify thermal design margins in your application.

Q: Can I use 2N6565 in place of BT169D-L,112?

A: Yes. The 2N6565 is electrically equivalent with matching 400V, 800mV, and 800mA specifications. It offers higher inventory availability (2300 units) and extended operating temperature range (-40°C to 110°C). The gate trigger current is 200µA, which is acceptable for sensitive gate SCR applications.

Q: What does "Sensitive Gate" mean for SCR selection?

A: Sensitive Gate SCRs require lower gate trigger current and voltage to turn on compared to standard SCRs. All parts listed in this reference maintain the Sensitive Gate classification, ensuring consistent gate drive requirements across substitutions.

Q: Are there packaging format differences I should consider?

A: Packaging formats (Tube, Bulk, Cut Tape, Tape & Reel) affect procurement and assembly handling but not electrical performance. Select based on your assembly process: Tube for manual insertion, Bulk for small quantities, Cut Tape for semi-automated assembly, and Tape & Reel for fully automated pick-and-place systems.

Q: Why is P0118DA 5AL3 listed as obsolete?

A: P0118DA 5AL3 is marked as obsolete by STMicroelectronics, indicating it is no longer in active production. Although inventory is available (2400 units), it should not be selected for new designs. Use active alternatives such as P0102DA series or Littelfuse EC103D variants instead.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant?

A: Both designations indicate compliance with lead-free and hazardous substance restrictions. ROHS3 represents the current EU RoHS Directive 2011/65/EU with updated substance restrictions. Both are acceptable for modern applications; ROHS3 is the current standard.

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