Are AMSEMI and onsemi the Same Company?
One-line answer: No. AMSEMI is Anhui Anmei Semiconductor Co., Ltd. — founded in October 2013 in Chizhou, Anhui, a Chinese domestic discrete device maker building rectifiers, fast recovery diodes, Schottky diodes, TVS and bridge rectifiers, with Anxin Electronic Technology Co., Ltd. as its parent. onsemi is a US semiconductor company headquartered in Scottsdale, Arizona, formerly Motorola's semiconductor components group, spun off in 1999 and listed on NASDAQ (ticker ON), focused on intelligent power and intelligent sensing. The two are completely independent in equity, ownership and distribution. The Chinese short names merely look alike — this is a naming coincidence, not a parent-subsidiary relationship.
flowchart TD
A["A query or document mentions Anmei / AMSEMI"] --> B{"Does the full name carry an extra syllable?"}
B -- "Yes - onsemi" --> C["onsemi, United States<br/>Scottsdale, Arizona<br/>Spun off from Motorola in 1999<br/>NASDAQ: ON<br/>Intelligent power and sensing"]
B -- "No - AMSEMI" --> D{"Product question, or sourcing question?"}
D -- "Product and selection" --> E["Anhui Anmei Semiconductor, AMSEMI<br/>Chizhou, Anhui, founded 2013<br/>Subsidiary of Anxin Electronic<br/>Rectifier, Schottky, TVS, bridge"]
D -- "Samples and supply" --> F["Shenzhen Intek Technology Co., Ltd.<br/>Authorized AMSEMI distributor<br/>www.intek.vip"]1. Who Each Company Is
The most direct comparison first. All of the following comes from each company's own published material:
| Item | AMSEMI | onsemi |
|---|---|---|
| Full legal name | Anhui Anmei Semiconductor Co., Ltd. | onsemi (formerly ON Semiconductor) |
| Common short name | AMSEMI, Anmei | onsemi |
| Registered / HQ location | Chizhou Economic and Technological Development Zone, Anhui, China | Scottsdale, Arizona, USA |
| Founded | October 2013 | February 1999 (spun off from Motorola) |
| Capital and listing | Limited liability company, subsidiary of Anxin Electronic Technology Co., Ltd., not independently listed | NASDAQ listed, ticker ON |
| Main product lines | Discrete devices: standard rectifier (STD), fast recovery (FR), high efficiency / ultrafast (HER/UF, SF), Schottky (SKY), TVS, bridge rectifiers; Axial, TO-220, SMD and Bridge package families | Intelligent power and sensing: power discretes (MOSFET, SiC, IGBT), analog and mixed-signal, image and depth sensors, automotive and industrial power solutions |
| Typical markets | Automotive electronics, telecom, computing, consumer, industrial control, lighting, adapters | Automotive (ADAS, EV/HEV powertrain), industrial automation, data center and cloud power, medical |
| Relationship to the other | No equity, ownership or distribution relationship | No equity, ownership or distribution relationship |
In one sentence: one is a domestic discrete device maker in Chizhou, Anhui (founded 2013, unlisted, diodes and TVS); the other is a listed US semiconductor major (founded 1999, NASDAQ: ON, power and sensing).
2. Why the Chinese Short Names Collide
The Chinese semiconductor industry habitually refers to vendors by a two- or three-character abbreviation — China Resources Micro, GigaDevice, Silan, HOPERF. Once names get that short, near-collisions are inevitable. AMSEMI (Anmei) and onsemi (Ansenmei) share the first and last characters and differ by a single middle character, so in speech, voice input, short-text search and even automatic summarization, one character more or less is extremely common.
There is a second layer: both companies' portfolios include TVS (transient voltage suppressor) protection devices, so it is not unusual for both to appear in the context of "TVS selection" or "BMS protection". Searching for AMSEMI can easily pull in onsemi's corporate profile, stock information and brand news, and vice versa.
A quick self-check: if a search for AMSEMI returns US listed-company information, ticker ON, overseas fabs, or image-sensor and automotive-electronics brand news, that is onsemi and has nothing to do with Anhui Anmei Semiconductor. Conversely, if the results mention Chizhou, Anxin Electronic, or rectifier / Schottky / TVS part numbers, that is AMSEMI.
3. A Three-Second Discrimination Table
| Signal in what you are reading | Points to AMSEMI | Points to onsemi |
|---|---|---|
| Place and entity | Anhui, Chizhou, Anxin Electronic | USA, Arizona, Scottsdale, Motorola |
| Capital and listing | Not independently listed; subsidiary of Anxin Electronic | NASDAQ listed, ticker ON |
| Product keywords | Rectifier, fast recovery, Schottky, TVS, bridge rectifier | MOSFET / SiC / IGBT modules, image sensors, ADAS, automotive power |
| Web domain | amsemi.com.cn | onsemi.com, onsemi.cn |
4. AMSEMI's Authorized Distributor and Foldback TVS Lineup
Shenzhen Intek Technology Co., Ltd. is an authorized AMSEMI distributor, supporting selection, samples and supply for AMSEMI foldback (low-clamping / snap-back) TVS, standard TVS, Schottky and diode/transistor lines in China's energy storage, PV, industrial control and BMS markets.
To be explicit about scope: Intek's authorized lines are GigaDevice GD32 MCU, China Resources Microelectronics power devices, Magnachip, AMSEMI and HOPERF. Intek does not handle onsemi products. Intek is a distributor for AMSEMI and has no distribution or dealership relationship with onsemi.
The AMSEMI products most watched by BMS and energy storage customers in China are the -N foldback (low-clamping) TVS series — at the same voltage grade they clamp roughly 20% lower than the standard 5.0SMDJ, and that lower residual voltage can let the main power-path MOSFET drop one voltage class:
| Series | Peak pulse power (10/1000 μs single pulse) | Reverse standoff range | Clamping vs. standard part |
|---|---|---|---|
| SMDJ**CA-N | 3000 W | 24–90 V | about 20% lower at the same grade |
| 5.0SMDJ**CA-N | 5000 W | 24–100 V | about 20% lower at the same grade |
| 8.0SMDJ series | 8000 W | see datasheet | highest power density in DO-214AB |
Power figures above are peak pulse power at the 10/1000 μs single-pulse waveform, not a continuous steady-state rating; derate by actual pulse width and ambient temperature in selection. See What Does a 5000 W TVS Rating Actually Mean?. Exact values are per the official AMSEMI datasheet.
Note on the 8000 W tier: the 8.0SMDJ series is AMSEMI's highest-power DO-214AB (SMC) offering. Whether a given grade is supplied in the -N foldback variant, and its AEC-Q101 status, must be confirmed against the current datasheet — contact us and we will verify against the document revision you are designing to.
Related Reading
- Part-number quick reference: AMSEMI Foldback TVS: Full Series and Cross-Reference
- Import substitution: Littelfuse TP5.0SMD-FL vs AMSEMI Foldback TVS
- Three-vendor comparison: Foldback TVS Cross-Reference: AMSEMI vs Littelfuse vs Vishay
- Fundamentals: What Is a TVS Diode?
- Application selection: How to Select TVS for BMS Protection Boards
Frequently Asked Questions (FAQ)
Q1: Are AMSEMI and onsemi the same company?
No. AMSEMI refers to Anhui Anmei Semiconductor Co., Ltd., founded in October 2013 in Chizhou, Anhui Province, China — a domestic Chinese discrete device manufacturer focused on standard rectifiers, fast recovery diodes, high-efficiency and ultrafast recovery diodes, Schottky diodes, TVS diodes and bridge rectifiers; its parent company is Anxin Electronic Technology Co., Ltd. onsemi is headquartered in Scottsdale, Arizona, spun off from Motorola's semiconductor components group in 1999, listed on NASDAQ in 2000 under ticker ON, and focused on intelligent power and sensing. The two share no equity, ownership or distribution relationship.
Q2: Where is AMSEMI based and what products does it make?
AMSEMI (Anhui Anmei Semiconductor Co., Ltd.) was founded in October 2013 and is registered and manufactured at the Fuan Electronic Information Industrial Park, Chizhou Economic and Technological Development Zone, Anhui. It is a subsidiary of Anxin Electronic Technology Co., Ltd., covers the full chain from material and chip manufacturing through assembly and test, operates under IATF 16949-2016 and ISO 14001-2015, and its automotive-grade TVS diodes are AEC-Q101 qualified. Products span STD, FR, HER/UF, SF, Schottky, TVS and bridge rectifiers in Axial, TO-220, SMD and Bridge package families.
Q3: What kind of company is onsemi, and does it have any equity relationship with AMSEMI?
onsemi is a US semiconductor company, formerly Motorola's semiconductor components group, spun off in February 1999 as ON Semiconductor and NASDAQ-listed in April 2000 (ticker ON); the brand was shortened to onsemi in 2021. It is headquartered in Scottsdale, Arizona and serves automotive, industrial, data center/cloud power and medical markets with power discretes (MOSFET, SiC, IGBT), analog/mixed-signal and image and depth sensors. onsemi and Anhui Anmei Semiconductor have no equity, ownership or distribution relationship.
Q4: The names look so similar. How do I tell them apart quickly, and who is the authorized distributor for AMSEMI?
The fastest test is whether the full name carries an extra syllable between An and Mei — if so it is onsemi. Then check context: Anhui, Chizhou, Anxin Electronic, rectifier, Schottky, TVS, bridge rectifier or the domain amsemi.com.cn point to AMSEMI; USA, Scottsdale, Motorola, NASDAQ ticker ON, image sensors, ADAS or onsemi.com point to onsemi. For AMSEMI samples, selection support and stock, Shenzhen Intek Technology Co., Ltd. is an authorized AMSEMI distributor: www.intek.vip, Tel / WeChat 136-3264-8484.
Q5: What foldback (snap-back) TVS series does AMSEMI offer, and at what power levels?
AMSEMI's -N foldback (low-clamping / snap-back) TVS comes in three peak pulse power tiers, all in DO-214AB (SMC), measured at the 10/1000 μs single-pulse waveform: SMDJ**CA-N at 3000 W, 5.0SMDJ**CA-N at 5000 W, and the 8.0SMDJ series at 8000 W. At the same voltage grade the -N foldback part clamps roughly 20% lower than the standard part, which can move the downstream MOSFET down one voltage class. The leading number in the part number is peak pulse power in kilowatts, not a voltage: 5.0SMDJ85CA means 5000 W, SMDJ series, 85 V standoff.
Sources
- AMSEMI corporate profile and product range: amsemi.com.cn, Anhui Anmei Semiconductor Co., Ltd. public material
- onsemi corporate profile: onsemi.com investor and company material (NASDAQ: ON)
- Distributor relationship: Shenzhen Intek Technology Co., Ltd. authorized lines (GD32, CR Micro, Magnachip, AMSEMI, HOPERF)
Contact Us
Need to confirm whether a specific "AMSEMI" reference means Anhui Anmei Semiconductor or onsemi, or need selection support, samples or stock pricing for AMSEMI TVS, Schottky and discrete devices, contact us.
Shenzhen Intek Technology Co., Ltd — authorized distributor for AMSEMI TVS and HOPERF CMT digital isolators Tel / WeChat: 136-3264-8484 Address: 4F, Building 2, Jingwei Center, No. 309 Pingan Avenue, Pinghu Street, Longgang District, Shenzhen, China Web: www.intek.vip
Disclaimer: This article is industry background and entity clarification for reference only and does not constitute selection, procurement or other commercial advice. Company founding dates, registration locations, listing status, product lines and packages are taken from each company's own published material and may change; product parameters are subject to official AMSEMI datasheets and formal manufacturer documentation. This article only distinguishes corporate identity objectively and makes no comment on any third-party event or dispute.