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72PR1MEGLF Equivalent & Substitute Parts
Part Overview
The 72PR1MEGLF is a 1 MOhm 0.5W through-hole trimmer potentiometer manufactured by TT Electronics/BI. This cermet-based component features top adjustment, PC pin termination, and a square 0.375" x 0.375" form factor. The part is active and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and functional performance within the allowed parameter tolerances for this product category.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resistance | 1 MOhms |
| Power Rating | 0.5W (1/2W) |
| Tolerance | ±10% |
| Temperature Coefficient | ±100ppm/°C |
| Number of Turns | 1.0 |
| Adjustment Type | Top Adjustment |
| Resistive Material | Cermet |
| Mounting Type | Through Hole |
| Termination Style | PC Pins |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution is determined by matching the following critical parameters: resistance value (1 MOhms), power rating (0.5W), tolerance (±10%), temperature coefficient (±100ppm/°C), number of turns (1.0), resistive material (cermet), mounting type (through hole), and termination style (PC pins). Adjustment type and form factor are secondary considerations that may vary within functional equivalence. All substitute parts listed maintain these core electrical and mechanical specifications.
The substitute parts are grouped into two categories:
Category 1: Direct Electrical Equivalents with Adjustment Type Variation
- M63M105KB40 (Vishay Spectrol): Matches all electrical parameters but features side adjustment instead of top adjustment, with a slightly larger form factor (0.395" x 0.395").
Category 2: Bourns Trimpot® 3362 Series (Top Adjustment, Sealed)
- 3362F-1-105LF, 3362H-1-105LF, 3362P-1-105LF, 3362R-1-105LF, 3362U-1-105LF: All match electrical specifications with top adjustment and rectangular form factor (0.275" x 0.260").
Category 3: Bourns Trimpot® 3386 Series (Top Adjustment, Sealed, Square Form Factor)
- 3386F-1-105LF, 3386G-1-105LF, 3386M-1-105LF: Match electrical specifications with top adjustment and square form factor (0.375" x 0.375"), providing closest mechanical compatibility to the 72PR1MEGLF.
Parameter Comparison
| Part Number | Manufacturer | Resistance | Power (W) | Tolerance | Temp Coeff | Turns | Adjustment | Material | Mounting | Termination | Form Factor | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 72PR1MEGLF | TT Electronics/BI | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Top | Cermet | Through Hole | PC Pins | Square 0.375" x 0.375" | ROHS3 |
| M63M105KB40 | Vishay Spectrol | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Side | Cermet | Through Hole | PC Pins | Square 0.395" x 0.395" | ROHS3 |
| 3362F-1-105LF | Bourns Inc. | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Top | Cermet | Through Hole | PC Pins | Rectangular 0.275" x 0.260" | ROHS3 |
| 3362H-1-105LF | Bourns Inc. | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Top | Cermet | Through Hole | PC Pins | Rectangular 0.275" x 0.260" | ROHS3 |
| 3362P-1-105LF | Bourns Inc. | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Top | Cermet | Through Hole | PC Pins | Rectangular 0.275" x 0.260" | ROHS3 |
| 3362R-1-105LF | Bourns Inc. | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Top | Cermet | Through Hole | PC Pins | Rectangular 0.275" x 0.260" | ROHS3 |
| 3362U-1-105LF | Bourns Inc. | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Top | Cermet | Through Hole | PC Pins | Rectangular 0.275" x 0.260" | ROHS3 |
| 3386F-1-105LF | Bourns Inc. | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Top | Cermet | Through Hole | PC Pins | Square 0.375" x 0.375" | ROHS3 |
| 3386G-1-105LF | Bourns Inc. | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Top | Cermet | Through Hole | PC Pins | Square 0.375" x 0.375" | ROHS3 |
| 3386M-1-105LF | Bourns Inc. | 1 MOhm | 0.5 | ±10% | ±100ppm/°C | 1.0 | Top | Cermet | Through Hole | PC Pins | Square 0.375" x 0.375" | ROHS3 |
Engineering Selection Recommendations
All listed substitute parts are active products with ROHS3 compliance, matching the regulatory status of the 72PR1MEGLF. Selection should prioritize form factor compatibility with the original PCB layout.
For direct mechanical replacement without PCB modification, the Bourns Trimpot® 3386 series (3386F-1-105LF, 3386G-1-105LF, 3386M-1-105LF) provides the closest match, maintaining the square 0.375" x 0.375" form factor and top adjustment configuration.
The Bourns Trimpot® 3362 series (3362F-1-105LF, 3362H-1-105LF, 3362P-1-105LF, 3362R-1-105LF, 3362U-1-105LF) offers electrical equivalence with a smaller rectangular form factor (0.275" x 0.260"), suitable for space-constrained applications where PCB layout permits.
The Vishay Spectrol M63M105KB40 provides electrical equivalence with side adjustment instead of top adjustment and a slightly larger square form factor (0.395" x 0.395"), requiring evaluation of adjustment accessibility in the target application.
Frequently Asked Questions (FAQ)
Q: Can the Bourns Trimpot® 3362 series be used as a direct replacement for the 72PR1MEGLF?
A: Electrically, yes. The 3362 series matches all core specifications: 1 MOhm resistance, 0.5W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, 1.0 turn, top adjustment, cermet material, through-hole mounting, and PC pin termination. However, the rectangular form factor (0.275" x 0.260") differs from the original square form factor (0.375" x 0.375"), requiring PCB layout verification.
Q: What is the difference between the Bourns 3362 and 3386 series?
A: Both series are sealed Trimpot® products with identical electrical specifications for the 1 MOhm 0.5W configuration. The primary difference is form factor: the 3362 series uses a rectangular body (0.275" x 0.260"), while the 3386 series uses a square body (0.375" x 0.375"). The 3386 series provides closer mechanical compatibility to the 72PR1MEGLF.
Q: Why does the Vishay Spectrol M63M105KB40 have side adjustment instead of top adjustment?
A: The M63M105KB40 is a different design variant within the Vishay Spectrol product line. While it maintains all electrical specifications matching the 72PR1MEGLF, the side adjustment configuration requires different operator access and may not be suitable for applications designed for top adjustment.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the regulatory requirement of the 72PR1MEGLF.
Q: Which substitute part offers the best form factor compatibility?
A: The Bourns Trimpot® 3386 series (3386F-1-105LF, 3386G-1-105LF, 3386M-1-105LF) maintains the square 0.375" x 0.375" form factor and top adjustment of the original part, providing the closest mechanical compatibility without PCB modification.
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