Request Quote
(Ships tomorrow)
LM317BT Linear Voltage Regulator IC Equivalent & Substitute Parts
Part Overview
The LM317BT is a positive adjustable linear voltage regulator IC manufactured by onsemi, rated for 1.5A output current in a TO-220-3 package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The LM317BT series represents a foundational adjustable regulator topology with widespread industry adoption across multiple manufacturers, enabling direct functional substitution through parametrically equivalent alternatives.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM317BT |
| Manufacturer | onsemi |
| Category | Power Management (PMIC) |
| Package / Case | TO-220-3 |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 40V |
| Voltage - Output (Min/Fixed) | 1.2V |
| Voltage - Output (Max) | 37V |
| Current - Output | 1.5A |
| Current - Quiescent (Iq) | 10 mA |
| PSRR | 80dB ~ 65dB (120Hz) |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C |
| Mounting Type | Through Hole |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the LM317BT is determined by strict equivalence across the following critical parameters:
- Output configuration (Positive)
- Output type (Adjustable)
- Number of regulators (1)
- Maximum input voltage (40V)
- Output voltage range (1.2V to 37V minimum/maximum)
- Output current rating (1.5A)
- Quiescent current (10 mA)
- Package type (TO-220-3)
- Protection features (Over Current, Over Temperature, Short Circuit)
- Operating temperature range (-40°C to 125°C)
Substitute parts are categorized as follows:
Direct Manufacturer Equivalents: Parts from onsemi and other manufacturers with identical electrical specifications and TO-220-3 packaging, differing only in product status (Active vs. Obsolete) or packaging format (Tube vs. Bulk).
Parametric Equivalents: Parts meeting all electrical and thermal specifications with active product status, enabling seamless functional replacement in circuit designs.
Similar Parts: Parts with minor parameter variations (such as reduced operating temperature range or different quiescent current specifications) that may require design review before substitution.
Parameter Comparison
| Parameter | LM317BT (onsemi) | LM317BTG (onsemi) | LM317KCS (TI) | LM317KCSE3 (TI) | LM317T (NTE) | LM317T-BP (MCC) | LM317AT/NOPB (TI) | LM317KCT (TI) | LM317BT (STMicroelectronics) |
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | Texas Instruments | Texas Instruments | NTE Electronics | Micro Commercial Co | Texas Instruments | Texas Instruments | STMicroelectronics |
| Product Status | Obsolete | Active | Active | Last Time Buy | Active | Active | Active | Obsolete | Active |
| Output Configuration | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive |
| Output Type | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable |
| Number of Regulators | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Input (Max) | 40V | 40V | 40V | 40V | 37V | 40V | 40V | 40V | 40V |
| Voltage - Output (Min/Fixed) | 1.2V | 1.2V | 1.25V | 1.25V | 1.25V | 1.25V | 1.25V | 1.25V | 1.2V |
| Voltage - Output (Max) | 37V | 37V | 37V | 37V | 37V | 37V | 37V | 37V | 37V |
| Current - Output | 1.5A | 1.5A | 1.5A | 1.5A | 1.5A | 1.5A | 1.5A | 1.5A | 1.5A |
| Current - Quiescent (Iq) | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 100 µA | 10 mA | 10 mA | 10 mA |
| PSRR | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 64dB (120Hz) | - | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) |
| Protection Features | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | - | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C | 0°C ~ 125°C | 0°C ~ 125°C | 0°C ~ 125°C | 0°C ~ 125°C (TJ) | -40°C ~ 125°C | 0°C ~ 125°C | -40°C ~ 125°C |
| Package / Case | TO-220-3 | TO-220-3 | TO-220-3 | TO-220-3 | TO-220-3 | TO-220-3 | TO-220-3 | TO-220-3 | TO-220-3 |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | - | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: LM317BTG (onsemi)
The LM317BTG is the direct active equivalent from the original manufacturer onsemi. It maintains identical electrical specifications to the LM317BT while offering Active product status and ROHS3 compliance. This part provides the lowest risk substitution path for existing designs and is recommended as the first choice for new production.
Secondary Recommendation: LM317AT/NOPB (Texas Instruments)
The LM317AT/NOPB from Texas Instruments meets all electrical and thermal specifications of the LM317BT, including the full -40°C to 125°C operating temperature range. This part carries Active product status and ROHS3 compliance, with substantial inventory availability (634,378 pcs). It is suitable for applications requiring extended temperature operation.
Tertiary Recommendation: LM317BT (STMicroelectronics)
The LM317BT from STMicroelectronics is a parametric equivalent offering identical specifications to the onsemi original, including the 1.2V minimum output voltage and -40°C to 125°C operating range. This part carries Active product status and ROHS3 compliance.
Alternative Consideration: LM317KCS (Texas Instruments)
The LM317KCS from Texas Instruments provides full electrical equivalence with the exception of a reduced operating temperature range (0°C to 125°C versus -40°C to 125°C). This part is suitable for applications not requiring extended low-temperature operation and carries Active product status with ROHS3 compliance.
Not Recommended: LM317T-BP (Micro Commercial Co)
The LM317T-BP exhibits significant deviations from the LM317BT specification, including substantially reduced quiescent current (100 µA versus 10 mA) and undocumented protection features. This part requires design verification before substitution.
Not Recommended: LM317KCT (Texas Instruments)
The LM317KCT carries Obsolete product status, making it unsuitable as a replacement for the discontinued LM317BT.
Frequently Asked Questions (FAQ)
Q: Can I directly replace LM317BT with LM317BTG in my existing circuit?
A: Yes. The LM317BTG is the direct active equivalent from onsemi with identical electrical specifications, package type, and pin configuration. No circuit modifications are required.
Q: What is the difference between LM317BT and LM317AT/NOPB?
A: Both parts are functionally equivalent with identical output voltage range (1.2V to 37V), output current (1.5A), and protection features. The primary difference is manufacturer: onsemi versus Texas Instruments. The LM317AT/NOPB offers superior inventory availability and Active product status.
Q: Does the minimum output voltage difference (1.2V vs. 1.25V) affect substitution?
A: The 1.2V minimum output voltage of the LM317BT and LM317BTG is a subset of the 1.25V minimum specified by Texas Instruments parts. Circuits designed for 1.2V operation can use Texas Instruments equivalents without modification. Circuits requiring output voltages below 1.25V must use onsemi or STMicroelectronics parts.
Q: Can I use LM317T-BP as a substitute?
A: The LM317T-BP exhibits reduced quiescent current (100 µA versus 10 mA) and lacks documented protection features. This part requires design review and testing before substitution in production applications.
Q: What is the significance of the operating temperature range difference?
A: The LM317BT and LM317AT/NOPB support -40°C to 125°C operation, while LM317KCS and LM317KCSE3 support 0°C to 125°C. Applications requiring operation below 0°C must use parts with the extended temperature range.
Q: Are all substitute parts RoHS compliant?
A: The original LM317BT is RoHS non-compliant. All active substitute parts (LM317BTG, LM317KCS, LM317KCSE3, LM317T, LM317AT/NOPB, and STMicroelectronics LM317BT) carry ROHS3 compliance certification.
Q: What is the inventory status of recommended substitutes?
A: LM317BTG (onsemi) has 100,099 pcs available. LM317AT/NOPB (Texas Instruments) has 634,378 pcs available. LM317BT (STMicroelectronics) has 3,100 pcs available. All recommended parts maintain active production status with adequate supply.
Q: Can I mix different manufacturers in the same production batch?
A: Yes. All recommended substitute parts maintain identical electrical specifications, package type, and pin configuration. Cross-manufacturer substitution does not require circuit modification or design re-qualification.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts