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L3121B

The ST L3121B is a programmable transient voltage suppressor designed for SLIC protection. It offers bidirectional protection with programmable breakdown voltage up to 100V.

✓ Total Stock: 442 pcs

$ Price Range: $1.93

L3121B Available from 2 distributors

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Chanetech ✓ Non-Authorised Inventory information	400 pcs On Request	400 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request
Partservice ✓ Non-Authorised Inventory information	42 pcs On Request	42 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request

L3121B Specifications Quick View

Most important parameters for selection – full specs in datasheet.

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Category	New Products
Manufacturer Name	STMicroelectronics
Capacitance	500 pF
Operating Temperature Range	-40 to +85 °C
Package / Case	SIP4
SVHC Present	Not Present

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L3121B Description

Short technical summary and product information.

The L3121B from ST is a programmable transient voltage suppressor specifically designed for protecting Subscriber Line Interface Circuits (SLICs) with integrated ring generators. This bidirectional device offers voltage programmability in both positive and negative polarities, with a programmable breakdown voltage capability up to 100V.

Key features include a high surge current capability, with a peak pulse current (IPP) of 100A at a 10/1000 μs waveform and 250A at a 2/10 μs waveform. The device also boasts a non-repetitive surge peak on-state current of 50A for a 10 ms pulse.

Electrical characteristics include a typical stand-off voltage of 5V, a maximum breakdown voltage range of 60V to 90V, and a holding current of 150 mA minimum. The maximum voltage across LINE/GND is 100V, and across GATE/LINE is 80V. The L3121B is housed in a SIP4 package.

This transient voltage suppressor complies with various standards including ITU-T K20, VDE0433, VDE0878, IEC1000-4-5, FCC Part 68, and BELLCORE TR-NWT-001089, making it suitable for robust protection applications where high surge capability is required.

L3121B Quick Information

Product Type: Programmable Transient Voltage Suppressor

Canonical Name: L3121B Programmable Transient Voltage Suppressor

Subcategory: Programmable

L3121B Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

L3121B Estimated Pricing

Qty	Low	High
1+	$1.93	$1.93

Estimated market price range - modelled values for guidance only, not live distributor offers.

L3121B Features

Programmable transient voltage suppressor for SLIC protection.
Bidirectional function with programmable voltage.
High surge current capability up to 100A.
Operates over a wide temperature range.
SIP4 package for through-hole mounting.

L3121B Applications

Protects subscriber line interface circuits.
Suitable for integrated ring generator circuits.
Used in telecommunication equipment.
Handles positive and negative surges.

L3121B FAQs

4 frequently asked questions generated from this part’s specifications.

What is the peak pulse current of the L3121B?

The peak pulse current is 100A for a 10/1000 μs waveform and 250A for a 2/10 μs waveform.

What is the maximum voltage for the L3121B?

The maximum voltage across LINE/GND is 100V, and across GATE/LINE is 80V.

What is the operating temperature range for the L3121B?

The operating temperature range is -40°C to +85°C.

What package type is the L3121B available in?

The L3121B is available in a SIP4 package.