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Home > Products > Discrete Semiconductor Products > Thyristors > SCRs

STMicroelectronics TS110-7A1

Name: TS110-7A1
Brand: STMicroelectronics
SKU: TS110-7A1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS110-7A1

Manufacturer:: STMicroelectronics

Category:: SCRs

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: TS110-7A1.pdf

Description:: SCR 700V 1.25A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:18

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Product details

Overview

TS110-7A1 from STMicroelectronics is a highly sensitive, 700 V repetitive peak off-state voltage silicon-controlled rectifier (SCR) in TO-92 package with GAK pinout, rated for 1.25 A RMS on-state current and 100 µA maximum gate trigger current. It serves as a crowbar protection switch in ground fault and arc fault circuit interrupters, delivering low leakage (<100 µA at 125 °C), robust surge handling (1250 V non-repetitive direct surge), and fast dV/dt immunity (≥15 V/µs at 125 °C).

For engineers reviewing the TS110-7A1 datasheet, TS110-7A1 pinout, TS110-7A1 application, or TS110-7A1 equivalent, this part is selected for high-reliability AC line transient protection where limited gate drive capability, low power loss, and self-triggering overvoltage ruggedness are critical - especially in RCD/RCBO designs requiring stable latching behavior and thermal resilience up to 125 °C junction temperature.

Technical Context

The TS110-7A1 is a unidirectional SCR optimized for automatic crowbar activation during AC line surges per IEC 61000-4-5, switching into conduction within microseconds when V_D exceeds ~67 % of V_DRM (≥15 V/µs dV/dt immunity). Its ultra-low I_GT (max 100 µA at 25 °C) enables direct triggering from high-impedance sensing circuits without external amplification.

It features a low on-state voltage drop (V_TM ≤ 1.4 V at 2.5 A, 25 °C), dynamic resistance ≤ 200 mΩ, and thermal resistance R_th(j-l) = 14 °C/W (TO-92), supporting reliable operation under repeated 8.3 ms surges up to 27 A while maintaining <2 mA holding current (I_H) and <2 mA latching current (I_L) across -40 to +125 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	1.25 A - Sustains continuous load current in GFCI/AFCI trip circuits without thermal derating at TL = 58 °C
VDRM / VRRM	700 V - Blocks full AC mains cycle peaks (e.g., 230 V_RMS × √2 ≈ 325 V) with 2× safety margin
IGT (Q1)	100 µA max - Enables direct gate drive from microcontroller GPIO or op-amp comparator outputs
V_TM	≤1.4 V at 2.5 A - Minimizes conduction loss and self-heating during crowbar event
dV/dt immunity	≥15 V/µs at 125 °C - Prevents false triggering from fast transients in noisy industrial environments
IDRM / IRRM	≤100 µA at 125 °C - Ensures low standby power consumption over 10+ year circuit breaker lifetime
R_th(j-l)	14 °C/W - Supports 1.25 A RMS operation with minimal heatsinking in TO-92 through-hole layout

Pinout & Package

TS110-7A1 is supplied in TO-92 package (lead-free, halogen-free, UL94 V0 epoxy) with axial leads and standard GAK (Gate-Anode-Cathode) terminal arrangement. The package supports manual or wave soldering and provides mechanical stability for high-vibration circuit breaker housings.

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control input	Accepts low-current trigger signal (≤100 µA) to initiate latching conduction; high impedance (>7.5 V reverse blocking)
A (Anode)	Main current entry	Connects to AC line phase; withstands 700 V repetitive blocking and 1250 V surge before crowbar activation
K (Cathode)	Main current exit	Routes current to load or trip coil; defines reference for gate bias and holds latched state until current zero-crossing

Key Features

Feature	Design Value
Self-protecting crowbar action	Automatically triggers on-line surge exceeding 67 % VDRM, clamping energy safely through load without external components
Ultra-low gate trigger current	Max 100 µA enables direct interface with low-power comparators or MCU pins - no driver stage required
High dV/dt immunity	≥15 V/µs at 125 °C prevents spurious turn-on from EMI or switching noise in shared PCB layouts
Low thermal resistance	R_th(j-l) = 14 °C/W allows 1.25 A RMS operation in TO-92 without heatsink or airflow
Extended temperature range	-40 to +125 °C operating junction range ensures reliability in enclosed, thermally constrained breaker enclosures

Applications

Ground Fault Circuit Interrupter (GFCI)

Arc Fault Circuit Interrupter (AFCI)

Use Scenario: Detects differential current >5 mA between line and neutral to prevent electrocution.

IC Role / Device Role / Timing Role: SCR acts as crowbar switch that shorts line-to-load upon trip signal, forcing upstream breaker to open.

Use Value: Low I_GT allows direct drive from isolation amplifier output; fast dV/dt immunity avoids nuisance tripping during motor startup.

Use Scenario: Monitors high-frequency current signatures to detect series/parallel arcing faults in branch circuits.

IC Role / Device Role / Timing Role: Latched crowbar device activated by analog front-end comparator; sustains conduction until AC zero-crossing.

Use Value: V_TM ≤1.4 V minimizes power dissipation during 10-ms crowbar window; low I_H (<2 mA) ensures clean turn-off at current zero.

Residual Current Device (RCD)

Residual Current Circuit Breaker with Overload (RCBO)

Use Scenario: Protects against earth leakage in domestic and commercial installations per IEC 61000-4-5.

IC Role / Device Role / Timing Role: Primary overvoltage protection element triggered by transient-induced gate voltage rise.

Use Value: 1250 V non-repetitive direct surge rating absorbs 10/700 µs telecom surges without degradation; R_th(j-l) = 14 °C/W maintains thermal stability during repeated tests.

Use Scenario: Combines residual current detection and thermal-magnetic overload protection in single-pole units.

IC Role / Device Role / Timing Role: Crowbar SCR integrated into trip-coil drive path, activated only during overvoltage events - independent of thermal trip mechanism.

Use Value: IDRM ≤100 µA at 125 °C reduces standby power draw below 100 µW, extending battery backup life in smart RCBOs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar SCR-based crowbar protection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STPS110-7A1	Same die, identical electrical specs; differs only in ECOPACK2 compliance marking and packaging format (ammopack vs bulk)	No functional difference; suitable for same GFCI/RCD designs requiring RoHS-compliant logistics	Select when full ECOPACK2 documentation and traceable ammopack delivery are required
Littelfuse S4006L	Higher I_GT (500 µA max), lower V_DRM (600 V), higher V_TM (1.7 V), TO-220 package	Requires gate driver; unsuitable for space-constrained TO-92 layouts; less efficient in low-power crowbar duty	Only consider if higher surge current (40 A) is prioritized over gate sensitivity and thermal footprint

Compared with STPS110-7A1, TS110-7A1 offers identical performance with standard bulk packaging; versus S4006L, it delivers 5× lower gate drive requirement and 20 % lower conduction loss in compact TO-92 - critical for miniaturized, battery-backed RCD modules.

Availability

TS110-7A1 is available at Aetrix Electronics and suitable for ground fault circuit interrupters, arc fault circuit interrupters, and residual current devices requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TS110-7A1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.

The TS110-7 series belongs to ST's high-reliability protection SCR product line, engineered specifically for circuit breaker and residual current protection systems demanding ultra-low gate sensitivity, self-triggering surge ruggedness, and extended thermal endurance.

FAQ

What is the maximum allowable gate-cathode resistance for reliable triggering?

The TS110-7A1 requires RGK ≤ 220 Ω to guarantee triggering at IGT ≤ 100 µA across -40 to +125 °C. At higher resistances, IGT increases significantly - e.g., RGK = 1 kΩ raises typical IGT to ~500 µA, risking failure to latch in low-drive applications like battery-powered GFCIs.

Can TS110-7A1 be used in bidirectional AC protection circuits?

No - TS110-7A1 is a unidirectional SCR and blocks only in the reverse direction (VRRM = 700 V) but conducts only when anode is positive relative to cathode. For bidirectional protection, two TS110-7A1 devices must be connected in inverse-parallel, or a dedicated TRIAC such as ST's BT139-600E should be selected.

How does the TS110-7A1 recover after a crowbar event?

After conducting during a surge, TS110-7A1 automatically regains full blocking capability at the next natural current zero-crossing of the AC waveform (within ≤10 ms on 50 Hz mains). No reset signal or external circuitry is needed - recovery is inherent to SCR physics and confirmed for ≥10 IEC 61000-4-5 surge cycles.

Is the TO-92 package of TS110-7A1 compatible with automated through-hole assembly?

Yes - the TO-92 package meets IPC-7351B standards with defined lead pitch (2.54 mm), coplanarity, and lead form (straight, tinned). It supports wave soldering and selective soldering processes; however, thermal profiling must respect peak temperature ≤260 °C for ≤10 s to preserve UL94 V0 epoxy integrity and junction reliability.

TS110-7A1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

Product Status:: Active

Voltage - Off State:: 700 V

Voltage - Gate Trigger (Vgt) (Max):: 800 mV

Current - Gate Trigger (Igt) (Max):: 100 µA

Voltage - On State (Vtm) (Max):: 1.4 V

Current - On State (It (AV)) (Max):: 800 mA

Current - On State (It (RMS)) (Max):: 1.25 A

Current - Hold (Ih) (Max):: 2 mA

Current - Off State (Max):: 1 µA

Current - Non Rep. Surge 50, 60Hz (Itsm):: 25A, 27A

SCR Type:: Sensitive Gate

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

TS110-7A1 FAQ

1.How can I place an order for TS110-7A1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TS110-7A1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TS110-7A1 reliable?

The price and inventory of TS110-7A1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS110-7A1 is usually 5 days.

3.What payment methods are accepted for TS110-7A1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS110-7A1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS110-7A1?

TS110-7A1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS110-7A1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TS110-7A1?

For technical support, including TS110-7A1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS110-7A1 requirements.

6.How does Aetrix verify that TS110-7A1 is sourced from the original manufacturer or authorized distributors?

All TS110-7A1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TS110-7A1 meets industry standards.

7.What is the process for return or replacement of TS110-7A1?

All TS110-7A1 units undergo pre-shipment inspection (PSI). If there is an issue with TS110-7A1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TS110-7A1 part is unused and in its original packaging.

Return procedure for TS110-7A1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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