SESSCO Technologies

What SESSCO Technologies does

SESSCO Technologies is a privately held semiconductor test equipment specialist founded in 1995 and headquartered in Fremont, California, with manufacturing operations in Clark Freeport, Philippines. The company designs and manufactures gravity test handlers used in integrated circuit (IC) production testing, organized around its proprietary UTHA (Unified Test Handler Architecture) platform. UTHA is an all-integrated controller running at 11ns per step that unifies control systems across both legacy and advanced test handlers, reducing failure points and enabling consistent performance in high-volume production environments.

The product portfolio spans three lines: the Janus X series (anchored by the Janus X816 Tri-temp flagship delivering up to 28,000 units per hour with tri-temperature testing from -55°C to +175°C and configurations from 1 to 16 sites); the SIA Series of streamlined straight-through handlers for small packages (SOT-23, MSOP, TSSOP) and power modules (APM, IPM); and a Legacy Upgrade program that retrofits installed ASECO S-130, Symtek 300/429, and Exatron handlers with UTHA-based controllers. All products share a common hardware platform with modular software and comply with SECS/GEM factory automation standards.

The business model is direct enterprise field sales of capital hardware and professional services to semiconductor manufacturers and IC testing facilities. Pricing is quote-based and not publicly disclosed, with revenue streams from hardware sales (Janus X, SIA units), professional services (UTHA retrofits and modernization), and custom application engineering for NPI and specialty packages. The company was previously known as ASECO and operates as an independent entity with no disclosed external funding, parent company, or acquisition activity.

Name

SESSCO Technologies

Legal name

SESSCO Technologies

Website

https://sessco.com

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

11–50 employees

Short description

SESSCO Technologies, founded 1995 and based in Fremont, California, designs and manufactures gravity test handlers and the UTHA control platform for semiconductor IC production testing. It sells hardware, retrofits, and engineering services directly to semiconductor manufacturers and test facilities worldwide.

Ownership category

akta.pro rank

Product category

Semiconductor Test Equipment

NAICS

Semiconductor Machinery Manufacturing (333242)

SIC

Special Industry Machinery, Nec (3559)

akta.pro primary industry

Test, Probe & Burn-In Equipment (Wafer Sort/Final Test) (HDAHAEAJ)

Keywords

• Semiconductor test handlers
• IC test equipment
• Gravity test handlers
• Tri-temperature testing
• Semiconductor test automation

Headquarters

HQ city

San Jose

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Technology or R&D, Operations, Infrastructure

Revenue model

1. Gravity Test Handler Sales: Sale of semiconductor test handlers including Janus X816 Tri-temp Handler and SIA Series. One-time hardware purchase model with options for custom configurations (MEMS, HVPD, custom dual kits)
2. Legacy Handler Upgrade Services: UTHA retrofit and modernization services for legacy test handlers (ASECO S-130, Symtek 300, Symtek 429, Exatron), improving performance while reducing maintenance costs
3. Custom Application Engineering: Engineering services for custom handler configurations and NPI (New Product Introduction) applications with low NRE costs

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

SESSCO Technologies designs, manufactures, and sells semiconductor gravity test handlers under the Janus X and SIA Series product lines, all powered by its proprietary UTHA (Unified Test Handler Architecture) controller platform. The company also provides UTHA-based retrofit and modernization services for legacy ASECO, Symtek, and Exatron tri-temperature handlers. Products are sold directly to semiconductor IC manufacturers for high-volume production testing, tri-temperature testing, and custom IC package testing applications.

Product overview

SESSCO Technologies offers UTHA (Unified Test Handler Architecture), a modular semiconductor testing platform that unifies control systems across legacy and advanced test handlers. The portfolio includes the Janus X series flagship gravity test handlers (X816, X48, X24, X12, and custom variants) delivering up to 28,000 UPH throughput with tri-temperature capability (-55°C to +175°C), the SIA series streamlined handlers for small packages and power modules, and legacy handler upgrade services for ASECO, Symtek, and Exatron systems. All products share a common hardware platform with modular software for seamless scalability.

Differentiator

Problem solved

Functional benefit

Brands

• UTHA: Unified Test Handler Architecture - Transformative solution in semiconductor testing designed to unify and modernize control systems across legacy and advanced test handlers.
• Janus X
• SIA Series
• Legacy Upgrade

Products and services

• Janus X Series Gravity Test Handlers

Quantifiable outcome

• Up to 28,000 units per hour throughput - doubles output of handlers with 1x4 or 2x4 test site configuration
• +3 more outcomes

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Scale indicators5 records

Recent moves5 records

Expansion highlights5 records

Emerging players

• BE Semiconductor Industries (Besi): Besi is a Dutch semiconductor assembly equipment specialist focused on die bonding and packaging, with selective overlap to back-end test handling markets relevant to SESSCO's customer set of IC manufacturers and OSATs.

Direct peers

• Liconic: Liconic is a Switzerland-based manufacturer of semiconductor test handlers and environmental stress screening systems, directly competing with SESSCO in tri-temperature handler markets serving global semiconductor manufacturers.
• Chroma ATE: Chroma ATE is a Taiwan-based manufacturer of ATE systems and semiconductor test handlers, directly overlapping with SESSCO's product portfolio in IC handlers targeting analog/mixed-signal and power-device manufacturers.
• Rasco: Rasco is a Japan-based gravity test handler manufacturer targeting similar gravity-handler IC test applications as SESSCO's Janus X and SIA series, serving Japanese and broader Asian semiconductor manufacturers.
• Cohu: Cohu is a leading global supplier of semiconductor test handlers (acquired Multitest, Xcerra), directly competing with SESSCO in gravity and pick-and-place handler categories across the same customer base of fabs and OSATs.
• Techwing: Techwing is a South Korean semiconductor test handler manufacturer specializing in gravity and pick-and-place handlers, directly competing with SESSCO's Janus X and SIA product families in the memory and logic IC test markets.

Broad incumbents

• ASM Pacific Technology: ASMPT is a broad semiconductor back-end equipment supplier offering assembly, packaging, and test-handling solutions, competing with SESSCO in handler markets while operating at much larger scale across the full back-end equipment stack.
• Teradyne: Teradyne is a dominant ATE supplier with integrated handler offerings and robotics subsidiaries, operating broadly across semiconductor test while SESSCO specializes narrowly in the handler equipment that pairs with Teradyne testers.
• Advantest: Advantest is the global leader in semiconductor ATE with handler partnerships and some integrated offerings, competing with SESSCO at the equipment level while serving the same fab and OSAT customers.

Others

• Kulicke & Soffa: Kulicke & Soffa is a semiconductor and LED assembly equipment supplier operating adjacent to SESSCO's market — overlapping in customer base (OSATs, IDMs) but focused on wire bonding and advanced packaging rather than test handlers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/sessco-technologies-inc.

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SESSCO Technologies