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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > Thyristors

onsemi MMT10B230T3G

Name: MMT10B230T3G
Brand: onsemi
SKU: MMT10B230T3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMT10B230T3G

Manufacturer:: onsemi

Category:: Thyristors

Package:: DO-214AA, SMB

Datasheet:: MMT10B230T3G.pdf

Description:: THYRISTOR 170V 100A DO-214AA

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Product details

Overview

MMT10B230T3G from onsemi is a bidirectional thyristor surge protective device (TSPD) designed for secondary overvoltage protection in telecom line interfaces. It features 265 V breakover voltage (V_BO), 100 A 10×1000 µs surge current rating, and fails short-circuit under overstress-ensuring continued circuit protection. Used across customer-premises telecom equipment to meet Bellcore 1089, ITU K.20/K.21, and IEC 950 requirements.

For engineers reviewing the MMT10B230T3G datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping behavior, guaranteed 100 A surge capability at −20°C to +65°C, fail-safe shorting mode, SMB (DO-214AA) surface-mount package, and compliance with GR-1089 Level 2 surge testing.

Technical Context

The MMT10B230T3G operates as a crowbar-type protector triggered by voltage breakover-not avalanche breakdown-enabling precise, repeatable clamping at 265 V (min) / 290 V (max) in both polarities. Its holding current (I_H) ranges from 150 mA to 270 mA, ensuring reliable latching during surges and clean turn-off once current falls below threshold.

It exhibits low dv/dt sensitivity (2000 V/s min), minimal capacitance (65–200 pF), and stable V_BO temperature coefficient (+0.08%/°C), making it suitable for AC line and tip/ring telecom interfaces where transient amplitude independence and low signal distortion are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Breakover Voltage (V_BO)	265–290 V (bidirectional, defines clamping onset for lightning/inductive transients)
Surge Current Rating	100 A peak, 10×1000 µs waveform (validated at −20°C to +65°C for telecom deployment)
Holding Current (I_H)	150–270 mA (ensures sustained conduction during surge; turns off when line current drops below this)
Off-State Leakage (I_D2)	≤5.0 µA at V_DM = 170 V (low power loss in standby, no false triggering)
On-State Voltage (V_T)	≤5.0 V at 1.0 A (limits power dissipation during crowbar conduction)
dv/dt Immunity	≥2000 V/s (prevents spurious triggering from fast-rising noise or ringing)
Capacitance	65–200 pF at 1 MHz (minimal impact on high-frequency telecom signaling integrity)

Pinout & Package

MMT10B230T3G uses an SMB package (JEDEC DO-214AA), surface-mount, polarity-free case (Case 403C). Dimensions: 4.06–4.57 mm × 3.30–3.81 mm × 1.90–2.41 mm (L×W×H).

Pin/Terminal	Circuit Role	Design Meaning
MT1	Anode/Cathode (bidirectional)	Either terminal serves as anode or cathode depending on transient polarity; no DC bias dependency
MT2	Anode/Cathode (bidirectional)	Complementary terminal to MT1; forms symmetrical crowbar path for AC line protection

Key Features

Feature	Design Value
Bidirectional crowbar action	Clamps symmetrically on positive/negative transients without external polarity management
Fail-safe short-circuit mode	Guarantees protection continuity even after end-of-life overstress-no open-circuit failure risk
GR-1089 Level 2 compliance	Validated for 500 A, 2×10 µs surge waveforms-meets stringent telecom infrastructure requirements
Pb-free SMB packaging	RoHS-compliant surface-mount footprint compatible with standard reflow profiles (260°C max lead temp)
Stable V_BO vs. temperature	+0.08%/°C coefficient ensures predictable clamping across −40°C to +125°C operating range

Applications

DSL Line Interface Protection	VoIP Gateway Tip/Ring Protection
Use Scenario: Protects ADSL/VDSL line cards from lightning-induced surges entering via telephone line pairs. IC Role / Device Role / Timing Role: Crowbar-type overvoltage protector placed between tip/ring and PPTC fuse in secondary protection stage. Use Value: Clamps transients above 265 V within nanoseconds while surviving 100 A surges-preserving signal integrity and meeting GR-1089 Level 2.	Use Scenario: Secures analog voice ports in residential VoIP gateways against power cross and induced surges. IC Role / Device Role / Timing Role: Bidirectional voltage-triggered switch that shorts tip-to-ring during overvoltage events. Use Value: Eliminates need for dual unidirectional devices; maintains <200 pF capacitance to avoid degrading voice-band frequency response.
ISDN BRI Line Protection	Central Office Customer Premises Equipment
Use Scenario: Shields ISDN Basic Rate Interface (2B+D) lines from inductive switching transients and nearby lightning strikes. IC Role / Device Role / Timing Role: High-dv/dt immune (≥2000 V/s) TSPD placed upstream of line transformer and codec. Use Value: Prevents false triggering from ringing or harmonic content while delivering robust 100 A surge handling per line pair.	Use Scenario: Integrated into DSLAM or multi-line analog telephony adapters deployed at customer premises. IC Role / Device Role / Timing Role: Secondary protector coordinated with upstream gas discharge tube (GDT) and series PPTC. Use Value: Provides precise, repeatable clamping at 265 V-enabling compact, certified designs compliant with Bellcore 1089 and IEC 950.

DSL Line Interface Protection

VoIP Gateway Tip/Ring Protection

Use Scenario: Protects ADSL/VDSL line cards from lightning-induced surges entering via telephone line pairs.

IC Role / Device Role / Timing Role: Crowbar-type overvoltage protector placed between tip/ring and PPTC fuse in secondary protection stage.

Use Value: Clamps transients above 265 V within nanoseconds while surviving 100 A surges-preserving signal integrity and meeting GR-1089 Level 2.

Use Scenario: Secures analog voice ports in residential VoIP gateways against power cross and induced surges.

IC Role / Device Role / Timing Role: Bidirectional voltage-triggered switch that shorts tip-to-ring during overvoltage events.

Use Value: Eliminates need for dual unidirectional devices; maintains <200 pF capacitance to avoid degrading voice-band frequency response.

ISDN BRI Line Protection

Central Office Customer Premises Equipment

Use Scenario: Shields ISDN Basic Rate Interface (2B+D) lines from inductive switching transients and nearby lightning strikes.

IC Role / Device Role / Timing Role: High-dv/dt immune (≥2000 V/s) TSPD placed upstream of line transformer and codec.

Use Value: Prevents false triggering from ringing or harmonic content while delivering robust 100 A surge handling per line pair.

Use Scenario: Integrated into DSLAM or multi-line analog telephony adapters deployed at customer premises.

IC Role / Device Role / Timing Role: Secondary protector coordinated with upstream gas discharge tube (GDT) and series PPTC.

Use Value: Provides precise, repeatable clamping at 265 V-enabling compact, certified designs compliant with Bellcore 1089 and IEC 950.

Equivalent & Alternatives

The following parts are listed as comparable options for similar thyristor surge protection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMT10B260T3G	Higher V_BO: 320–340 V; same SMB package and 100 A surge rating	Better suited for 260 VAC nominal systems or higher-voltage telecom interfaces	Select when system working voltage exceeds 230 V RMS and margin against nuisance tripping is critical
SM10T220A	Unidirectional TVS diode (not thyristor); lower clamping voltage (~350 V), 100 A 10×1000 µs rating	Lacks crowbar latching; requires external current limiting and does not fail short	Choose only if fast clamping without hold-on behavior is acceptable-and secondary overcurrent protection is already present

Compared with MMT10B260T3G and SM10T220A, the MMT10B230T3G offers optimal balance of low clamping threshold (265 V), fail-safe shorting, and telecom regulatory alignment-making it the preferred choice for 230 VAC-based tip/ring protection where precise, self-sustaining crowbar action is required.

Availability

MMT10B230T3G is available at Aetrix Electronics and suitable for DSL line interface protection, VoIP gateway design, and ISDN BRI equipment requiring stable component supply and long-term obsolescence management.

Supply support for MMT10B230T3G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, serving automotive, industrial, cloud, and communications markets with discrete, analog, and logic solutions.

The MMT10B230T3G belongs to onsemi's Thyristor Surge Protector (TSPD) product line-engineered specifically for secondary-level overvoltage protection in telecom infrastructure and customer-premises equipment meeting international safety and surge immunity standards.

FAQ

What is the primary function of the MMT10B230T3G in a telecom circuit?

The MMT10B230T3G functions as a bidirectional crowbar-type surge protector that triggers at 265 V (min) to short-circuit transient overvoltages on telecom tip/ring lines. Unlike TVS diodes, it latches on until current falls below its holding threshold (150–270 mA), providing sustained clamping during multi-cycle surges-critical for lightning and power-cross events in DSL and VoIP equipment.

Does the MMT10B230T3G require external current limiting to operate safely?

Yes-the MMT10B230T3G must be used with upstream current-limiting elements such as PPTC fuses or resistors to ensure surge current remains within its 100 A 10×1000 µs rating and to allow safe turn-off after clamping. Without current limiting, sustained conduction could exceed thermal limits or prevent recovery, risking permanent short-circuit failure.

How does the MMT10B230T3G differ from a standard TVS diode like SMAJ24A?

The MMT10B230T3G is a thyristor-based crowbar device with latching behavior and fail-safe shorting, whereas SMAJ24A is a unidirectional avalanche TVS diode with non-latching clamping and open-circuit failure mode. The MMT10B230T3G provides higher surge current handling (100 A vs. ~40 A), bidirectional symmetry, and guaranteed short-circuit failure-essential for telecom secondary protection per Bellcore 1089.

Is the MMT10B230T3G RoHS-compliant and lead-free?

Yes-the "G" suffix in MMT10B230T3G explicitly denotes a Pb-free (lead-free) version compliant with RoHS Directive 2011/65/EU. It uses matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for SMB packages, supporting standard lead-free reflow soldering profiles up to 260°C peak temperature.

Can the MMT10B230T3G be used in AC mains applications?

No-the MMT10B230T3G is rated for telecom line protection (e.g., tip/ring, DSL, ISDN) with maximum off-state voltage of 170 V and operating junction temperature up to +125°C. It is not rated for direct connection to 120/230 VAC mains, lacks UL recognition for mains isolation, and lacks creepage/clearance certification required for primary-side AC safety standards.

MMT10B230T3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Package/Case:: DO-214AA, SMB

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Breakover:: 265V

Voltage - Off State:: 170V

Voltage - On State:: 5 V

Current - Peak Pulse (8/20µs):: -

Current - Peak Pulse (10/1000µs):: 100 A

Current - Hold (Ih):: 150 mA

Number of Elements:: 1

Capacitance:: 200pF

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMB

MMT10B230T3G FAQ

1.How can I place an order for MMT10B230T3G through Aetrix?

Please submit a Request for Quotation (RFQ) for MMT10B230T3G 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 MMT10B230T3G reliable?

The price and inventory of MMT10B230T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMT10B230T3G is usually 5 days.

3.What payment methods are accepted for MMT10B230T3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMT10B230T3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMT10B230T3G?

MMT10B230T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMT10B230T3G 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 MMT10B230T3G?

For technical support, including MMT10B230T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMT10B230T3G requirements.

6.How does Aetrix verify that MMT10B230T3G is sourced from the original manufacturer or authorized distributors?

All MMT10B230T3G 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 MMT10B230T3G meets industry standards.

7.What is the process for return or replacement of MMT10B230T3G?

All MMT10B230T3G units undergo pre-shipment inspection (PSI). If there is an issue with MMT10B230T3G, 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 MMT10B230T3G part is unused and in its original packaging.

Return procedure for MMT10B230T3G:

1.Submit a request within 90 days.

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

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