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TSSOP Package — Introduction & Applications
TSSOP (Thin Shrink Small Outline Package) is a surface-mount integrated circuit package with gull-wing leads extending from two opposite sides of a rectangular plastic body. It is a thinner version of the SSOP package, with a typical body thickness of only 1.0 mm to 1.2 mm, making it ideal for space-constrained and portable electronic designs.
TSSOP packages are widely used for medium-pin-count analog, digital, mixed-signal, and interface ICs. They offer a practical balance between compact size, manufacturability, solder-joint inspectability, and cost. Typical lead pitch is 0.65 mm, with pin counts commonly ranging from 8 to 64 pins, and some devices up to80 pins.
Key Features and Advantages
- Ultra-thin profile: ~1.0–1.2 mm body thickness, ideal for portable and height-constrained designs.
- Fine lead pitch: Typically 0.65 mm, enabling higher pin density than SOIC.
- Gull-wing leads: Provide mechanical compliance during thermal cycling and board flexure.
- Optically inspectable solder joints: Unlike BGA or QFN.
- Mature assembly process: Compatible with standard SMT reflow soldering.
- Wide availability: Many analog, interface, logic, memory, and mixed-signal ICs.
- Cost-effective: Lower routing and inspection cost than BGA for medium I/O density.
Typical Specifications
| Parameter | Typical Value |
|---|---|
| Package Type | Thin Shrink Small Outline Package (SMT) |
| Lead Pitch | 0.65 mm (some 0.5 mm and 0.8 mm variants) |
| Pin Count | 8 to 80 pins |
| Body Width | 4.4 mm, 6.1 mm, 7.8 mm |
| Body Thickness | ~1.0 mm to 1.2 mm |
| Lead Style | Gull-wing, two sides |
| Mounting | Surface-mount (SMT), reflow soldering |
| Operating Temperature | −40°C to +85°C or +125°C (device dependent) |
Common TSSOP Variants
| Variant | Pin Count | Body Width | Typical Applications |
|---|---|---|---|
| TSSOP-8 | 8 | 3.0 mm or 4.4 mm | Op-amps, comparators, EEPROM, interface ICs |
| TSSOP-14/16 | 14–16 | 4.4 mm | Logic, multiplexers, ADC/DAC, drivers |
| TSSOP-20/24 | 20–24 | 4.4 mm | Interface ICs, memory, controllers |
| TSSOP-28/32 | 28–32 | 6.1 mm | Microcontrollers, data converters, communication ICs |
| TSSOP-38/48 | 38–48 | 6.1 mm or 7.8 mm | Bus interfaces, logic, memory, display drivers |
| TSSOP-56/64 | 56–64 | 7.8 mm | Advanced MCUs, communication processors |
| TSSOP-80 | 80 | 7.8 mm or larger | High-pin-count controllers, complex SoCs |
Major Application Areas
Portable and Consumer Electronics
Smartphones, tablets, wearables, portable media players, digital cameras, and gaming devices. Used for power management, audio processing, display control, sensor interfacing, and interface conversion.
Analog and Mixed-Signal ICs
Operational amplifiers, comparators, data converters (ADC/DAC), multiplexers, analog switches, and sensor signal-conditioning ICs.
Interface and Communication ICs
RS-232, RS-485, CAN, USB, UART, I²C, SPI, and other interface transceivers for industrial communication, networking, embedded systems, and peripherals.
Logic and Memory Devices
Logic gates, shift registers, bus transceivers, decoders, EEPROM, Flash memory, and SRAM for control systems, data storage, and embedded designs.
Microcontrollers and Embedded Systems
8-bit, 16-bit, and 32-bit microcontrollers for consumer electronics, industrial control, automotive modules, and IoT devices.
Automotive Electronics
AEC-Q100 qualified TSSOP ICs for body control modules, infotainment systems, sensor interfaces, power management, and legacy ECU designs.
Industrial Control and Automation
PLCs, motor drives, sensor interfaces, data acquisition, instrumentation, and process control equipment.
Medical Devices
Patient monitoring, diagnostic instruments, portable medical devices, and medical imaging equipment.
Computing, Networking, and Data Storage
Motherboards, network routers, switches, optical modules, SSDs, and embedded computing boards.
Advantages and Disadvantages
Advantages:
- Ultra-thin profile (~1.0 mm) enables slim product designs.
- Smaller than SOIC and SSOP for the same pin count.
- Solder joints are optically inspectable.
- Mature, low-cost SMT assembly.
- Wide availability across analog, digital, and mixed-signal devices.
- Good mechanical compliance from gull-wing leads.
Disadvantages:
- Larger footprint than QFN or BGA for equivalent pin count.
- Fine 0.65 mm pitch requires careful PCB routing and stencil design.
- Higher parasitic inductance than leadless packages.
- Moderate thermal performance compared with QFN with exposed pad.
- Not ideal for very high pin counts or extreme miniaturization.
TSSOP vs. Related Packages
| Package | Lead Pitch | Body Thickness | Mounting | Typical Pin Count | Notes |
|---|---|---|---|---|---|
| SOIC | 1.27 mm | ~1.75 mm | SMT | 8–28 | Larger, easier soldering |
| SSOP | 0.65 mm | ~1.75–2.0 mm | SMT | 8–56+ | Smaller than SOIC |
| TSSOP | 0.65 mm | ~1.0–1.2 mm | SMT | 8–80 | Thinner, portable electronics |
| QSOP | 0.635 mm | ~1.75 mm | SMT | 16–40 | Quarter-size, compact |
| QFN | 0.4–0.5 mm | 0.8–1.0 mm | SMT | 16–100+ | Leadless, thermally enhanced |
Selection Considerations
- Pin Count: 8–80 pins based on I/O requirements.
- Lead Pitch: 0.65 mm standard; verify PCB manufacturing capability.
- Body Width: 4.4 mm, 6.1 mm, or 7.8 mm depending on pin count.
- Thermal Requirements: Consider QFN or exposed-pad packages for high-power devices.
- Temperature Grade: Commercial, industrial, or automotive (AEC-Q100).
- PCB Design: Proper pad geometry, solder mask, and stencil design for fine-pitch leads.
- Assembly: Reflow soldering is standard; optical inspection is possible.
- Availability: Confirm long-term supply and second-source options.
