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AP78L12SG-13 Linear Voltage Regulator — Equivalent & Substitute Parts
Part Overview
The AP78L12SG-13 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed positive 12V output at 100mA. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement.
The AP78L12SG-13 operates as a positive fixed output regulator in an 8-SOIC surface mount package. Its primary function is voltage regulation in low-current applications requiring stable 12V output from input sources up to 27V. The obsolete status of this part requires engineers to transition to active alternatives that maintain electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Output Voltage (Fixed) | 12V |
| Output Current | 100mA |
| Input Voltage (Maximum) | 27V |
| Quiescent Current (Iq) | 5 mA |
| PSRR @ 120Hz | 54dB |
| Protection Features | Over Temperature, Short Circuit |
| Operating Temperature Range | -20°C to 85°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the AP78L12SG-13 is determined by the following critical parameters:
- Fixed output voltage of 12V
- Output current capability of 100mA or greater
- 8-SOIC surface mount package with 0.154" (3.90mm) width
- Positive fixed output configuration
- Surface mount compatibility
- ROHS3 compliance
Substitute parts must maintain these core electrical and mechanical specifications. Parts are grouped by manufacturer and product status (active vs. obsolete). All identified substitutes are currently active products from established semiconductor manufacturers: STMicroelectronics, Texas Instruments, and onsemi.
Parameter Comparison
| Part Number | Manufacturer | Output Voltage | Output Current | Input Voltage (Max) | Iq (mA) | PSRR @ 120Hz | Operating Temp Range | Product Status | Package |
|---|---|---|---|---|---|---|---|---|---|
| AP78L12SG-13 | Diodes Incorporated | 12V | 100mA | 27V | 5 | 54dB | -20°C to 85°C | Obsolete | 8-SOIC |
| L78L12ABD-TR | STMicroelectronics | 12V | 100mA | 35V | 6 | 42dB | -40°C to 125°C | Active | 8-SOIC |
| L78L12ACD13TR | STMicroelectronics | 12V | 100mA | 35V | 6 | 42dB | 0°C to 125°C | Active | 8-SOIC |
| L78L12CD13TR | STMicroelectronics | 12V | 100mA | 35V | 5.5 | 42dB | 0°C to 125°C | Active | 8-SOIC |
| LM78L12ACM/NOPB | Texas Instruments | 12V | 100mA | 35V | 3 | 54dB | 0°C to 125°C | Active | 8-SOIC |
| LM78L12ACMX/NOPB | Texas Instruments | 12V | 100mA | 35V | 3 | 54dB | 0°C to 125°C | Active | 8-SOIC |
| MC78L12ABDR2G | onsemi | 12V | 100mA | 35V | 6.5 | 42dB | -40°C to 125°C | Active | 8-SOIC |
| MC78L12ACDR2G | onsemi | 12V | 100mA | 35V | 6.5 | 42dB | 0°C to 125°C | Active | 8-SOIC |
| NCV78L12ABDR2G | onsemi | 12V | 100mA | 35V | 6.5 | 42dB | -40°C to 125°C | Active | 8-SOIC |
| TL750L12CD | Texas Instruments | 12V | 150mA | 26V | 2 | 65dB | 0°C to 125°C | Active | 8-SOIC |
| TL750L12CDR | Texas Instruments | 12V | 150mA | 26V | 2 | 65dB | 0°C to 125°C | Active | 8-SOIC |
Engineering Selection Recommendations
All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the AP78L12SG-13.
STMicroelectronics L78L12 Series (L78L12ABD-TR, L78L12ACD13TR, L78L12CD13TR): These parts provide direct electrical equivalence with 12V fixed output and 100mA current capability. The L78L12ABD-TR supports extended temperature range (-40°C to 125°C) and higher maximum input voltage (35V vs. 27V). The L78L12ACD13TR and L78L12CD13TR variants differ in operating temperature range and quiescent current specifications.
Texas Instruments LM78L12 Series (LM78L12ACM/NOPB, LM78L12ACMX/NOPB): These parts match the original PSRR specification (54dB @ 120Hz) and offer lower quiescent current (3mA). Both variants provide 12V fixed output at 100mA with extended operating temperature range (0°C to 125°C) and higher maximum input voltage (35V). The primary difference is packaging format: tube versus cut tape with digi-reel.
onsemi MC78L12 and NCV78L12 Series (MC78L12ABDR2G, MC78L12ACDR2G, NCV78L12ABDR2G): These parts provide 12V fixed output at 100mA with 35V maximum input voltage. The MC78L12ABDR2G and NCV78L12ABDR2G support -40°C to 125°C operating range. The NCV78L12ABDR2G includes automotive qualification (AEC-Q100) for applications requiring automotive-grade components.
Texas Instruments TL750L12 Series (TL750L12CD, TL750L12CDR): These parts offer enhanced performance with 150mA output current capability, superior PSRR (65dB @ 120Hz), and lower quiescent current (2mA). Maximum input voltage is 26V. These are suitable for applications requiring higher current delivery or improved noise rejection.
Frequently Asked Questions (FAQ)
Q: Can I directly replace AP78L12SG-13 with any of the listed substitutes?
A: Yes, all listed substitutes maintain the critical electrical specifications: 12V fixed output, 100mA (or greater) output current, and 8-SOIC surface mount package. Pin-to-pin compatibility is maintained across all alternatives. Verify your specific application's temperature range and input voltage requirements before selection.
Q: What is the difference between the STMicroelectronics L78L12 variants?
A: The L78L12ABD-TR supports -40°C to 125°C operating range, while L78L12ACD13TR and L78L12CD13TR operate from 0°C to 125°C. Quiescent current varies slightly: L78L12ABD-TR and L78L12ACD13TR at 6mA, L78L12CD13TR at 5.5mA. All three provide identical 12V output at 100mA.
Q: Why do the Texas Instruments LM78L12 parts have lower quiescent current?
A: The LM78L12ACM/NOPB and LM78L12ACMX/NOPB specify 3mA quiescent current compared to 5-6mA in other alternatives. This represents improved power efficiency in standby conditions. The difference is manufacturing-specific and does not affect output voltage or current regulation performance.
Q: Should I use the TL750L12 series instead of the standard 100mA alternatives?
A: The TL750L12CD and TL750L12CDR are suitable if your application requires 150mA output current or benefits from superior PSRR (65dB). However, maximum input voltage is limited to 26V compared to 35V in other alternatives. Select based on your specific current and noise rejection requirements.
Q: What is the significance of the NCV78L12ABDR2G automotive qualification?
A: The NCV78L12ABDR2G carries AEC-Q100 automotive qualification, indicating compliance with automotive reliability and quality standards. This part is appropriate for automotive applications; standard industrial-grade alternatives are suitable for general-purpose applications.
Q: Are there temperature range considerations for my application?
A: The original AP78L12SG-13 operates from -20°C to 85°C. Most substitutes extend this range to 0°C to 125°C or -40°C to 125°C. If your application operates below 0°C, select L78L12ABD-TR, MC78L12ABDR2G, or NCV78L12ABDR2G. For standard industrial applications, any substitute is acceptable.
Q: What packaging options are available?
A: All substitutes are supplied in 8-SOIC surface mount packages with identical 0.154" (3.90mm) width. Packaging format varies by part number: tube, cut tape with digi-reel, or tape and reel. Select based on your procurement and assembly process requirements.
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