78SR110VC Equivalent & Substitute Parts

Part Overview

The 78SR110VC is a non-isolated Point-of-Load (PoL) module DC-DC converter manufactured by Texas Instruments, designed to deliver a fixed 10V output at up to 1.5A from a 14.5V to 30V input supply. This component is classified as obsolete, necessitating identification of active alternative products that maintain functional compatibility for existing applications in ITE (Commercial) environments.

The obsolete status of the 78SR110VC requires evaluation of substitute parts that can fulfill the same power conversion requirements while offering continued availability and manufacturer support.

Substiute Parts

78SR110VC

Texas InstrumentsIn Stock: 69278SR110VC Datasheet

Current PartRFQ

PTN78000WAZ

Texas InstrumentsIn Stock: 2307PTN78000WAZ Datasheet

MFR RecommendedRFQ

TPS84250RKGT

Texas InstrumentsIn Stock: 1480TPS84250RKGT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 78SR110VC is determined by the following critical parameters:

Functional Requirements:

• Single output topology (1 output required)
• Output voltage capability: 10V operation
• Output current capacity: minimum 1.5A
• Input voltage range: must accommodate 14.5V to 30V operation
• Non-isolated PoL module architecture

Environmental & Compliance Requirements:

• Operating temperature range: -40°C to 85°C
• RoHS3 compliance
• ITE (Commercial) application suitability

Substitution Logic: The identified substitute parts (PTN78000WAZ and TPS84250RKGT) are active products from Texas Instruments that provide adjustable output voltage ranges encompassing the fixed 10V output requirement of the 78SR110VC. Both substitutes support the required input voltage range, maintain the 1.5A minimum output current specification (with TPS84250RKGT providing 2.5A capability), and operate within the specified temperature range. The substitutes transition from through-hole to surface-mount packaging, requiring PCB redesign considerations.

Parameter Comparison

Engineering Selection Recommendations

PTN78000WAZ Selection Criteria: The PTN78000WAZ is an active product offering adjustable output voltage from 2.5V to 12.6V, which encompasses the 10V fixed output requirement. Input voltage range of 7V to 36V exceeds the 78SR110VC minimum requirement of 14.5V, providing broader input tolerance. Output current capacity matches the 1.5A specification. Operating temperature range and RoHS3 compliance align with the original part. The 5-SMD surface-mount package requires PCB layout modification from the original through-hole design. Enhanced protection features (OCP, OTP, UVLO) exceed the original OTP and SCP capabilities.

TPS84250RKGT Selection Criteria: The TPS84250RKGT is an active product with adjustable output voltage from 2.5V to 15V, accommodating the 10V requirement with extended range capability. Input voltage range of 7V to 50V provides maximum input flexibility. Output current capacity of 2.5A exceeds the 1.5A requirement, offering design margin. Operating temperature range and RoHS3 compliance match specifications. The 41-BQFN surface-mount package represents the most compact form factor, requiring significant PCB redesign. Enhanced protection features (OCP, OTP, UVLO) and control features (Enable, Active High) provide additional functionality. Efficiency rating of 96% exceeds the PTN78000WAZ at 91%.

Compliance Basis: Both substitute parts maintain ROHS3 compliance and ITE (Commercial) application suitability. Product status transition from obsolete to active ensures continued manufacturer support and availability.

Frequently Asked Questions (FAQ)

Q: Can the PTN78000WAZ directly replace the 78SR110VC without circuit modifications?

A: The PTN78000WAZ requires output voltage configuration to achieve 10V operation, as it provides an adjustable output range rather than fixed output. External resistor networks for voltage setting must be designed according to the PTN78000WAZ datasheet specifications. Mounting type transition from through-hole to surface-mount necessitates PCB redesign.

Q: What is the primary advantage of the TPS84250RKGT over the PTN78000WAZ?

A: The TPS84250RKGT provides higher output current capacity (2.5A versus 1.5A), wider input voltage range (7V to 50V versus 7V to 36V), superior efficiency (96% versus 91%), and a more compact package footprint. These characteristics provide enhanced design flexibility and thermal performance for applications requiring higher current delivery or extended input voltage tolerance.

Q: Are both substitute parts suitable for the same PCB layout?

A: No. The PTN78000WAZ uses a 5-SMD Module package, while the TPS84250RKGT uses a 41-BQFN Module package. Both differ from the original 3-SIP through-hole package. PCB layout modifications are required for either substitute, with the TPS84250RKGT requiring the most significant redesign due to its compact 11mm x 9mm footprint.

Q: How is the 10V output voltage achieved with adjustable-output substitutes?

A: Both PTN78000WAZ and TPS84250RKGT employ external resistor divider networks connected to feedback pins to set the output voltage. The 10V setpoint is calculated using the feedback reference voltage and resistor values specified in each device's datasheet. Precise resistor tolerances ensure output voltage accuracy.

Q: Do the substitute parts provide equivalent protection features?

A: The substitute parts provide enhanced protection compared to the 78SR110VC. The original part includes OTP (Over-Temperature Protection) and SCP (Short-Circuit Protection). Both substitutes include OCP (Over-Current Protection), OTP, and UVLO (Under-Voltage Lockout), offering more comprehensive fault protection.

Q: What is the impact of the input voltage range difference?

A: The 78SR110VC operates from 14.5V to 30V. Both substitutes accept 7V minimum input, providing lower input voltage tolerance. The TPS84250RKGT extends to 50V maximum input, compared to 36V for the PTN78000WAZ and 30V for the original part. Applications with input voltages below 14.5V require the substitute parts; applications with inputs above 30V require the TPS84250RKGT.

Q: Is moisture sensitivity a consideration for substitute selection?

A: The 78SR110VC has MSL 1 (Unlimited), indicating no moisture sensitivity. Both substitutes have MSL 3 (168 Hours), requiring controlled storage and handling conditions. This represents a change in component handling requirements during manufacturing and assembly.