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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics STTH112RL

Name: STTH112RL
Brand: STMicroelectronics
SKU: STTH112RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH112RL

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: STTH112RL.pdf

Description:: DIODE GEN PURP 1.2KV 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:18,059

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Product details

Overview

STTH112RL from STMicroelectronics is a high-voltage ultrafast recovery rectifier diode in DO-41 plastic package, rated for 1200 V repetitive peak reverse voltage (V_RRM), 1 A average forward current (I_F(AV)), and 75 ns reverse recovery time (t_rr) at 25 °C - optimized for snubber circuits, freewheeling, and clamping in offline switch-mode power supplies.

For engineers reviewing the STTH112RL datasheet, STTH112RL pinout, STTH112RL application, or STTH112RL equivalent, key selection criteria include verified soft-switching EMI performance, junction temperature capability up to 175 °C, thermal resistance (R_th(j-l) = 45 °C/W), low forward voltage drop (1.65 V max at 1 A/125 °C), and DO-41 lead-form compatibility with through-hole PCB assembly.

Technical Context

This planar silicon diode uses ST's ultrafast high-voltage technology to achieve soft reverse recovery with low stored charge (Q_rr implied by t_rr = 75 ns and I_rr = 0.25 A), minimizing switching losses and voltage overshoot during turn-off. Its 1.65 V maximum forward voltage at 1 A and 125 °C ensures efficient conduction under elevated thermal stress.

The device supports surge currents up to 20 A (8.3 ms sine half-wave) and operates across –50 °C to +175 °C storage and junction temperature ranges. Thermal design relies on junction-to-lead resistance of 45 °C/W (DO-41, L = 10 mm), validated via standardized JEDEC test conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - withstands peak reverse voltages in 800 V AC mains-derived SMPS designs without breakdown
I_F(AV)	1 A at T_L = 85 °C, δ = 0.5 - supports continuous conduction mode operation in low-power auxiliary rails
t_rr	75 ns at I_F = 0.5 A, I_Rr = 0.25 A, T_j = 25 °C - enables high-frequency switching (>100 kHz) with minimal recovery loss
V_F (max)	1.65 V at I_F = 1 A, T_j = 125 °C - limits conduction loss to ≤1.65 W per diode under worst-case thermal load
R_th(j-l)	45 °C/W (DO-41, L = 10 mm) - defines thermal path efficiency from junction to PCB copper land or heatsink tab
I_FSM	20 A (8.3 ms) - handles inrush and transient overloads in PFC and flyback clamp paths

Pinout & Package

STTH112RL is housed in a DO-41 plastic axial-leaded package with cathode indicated by a band. Leads are tinned and suitable for wave or hand soldering per IPC-J-STD-001. No internal terminals - two-terminal device: anode and cathode.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to positive side of inductive load or switching node; must sustain full reverse voltage when cathode is biased higher
Cathode	Forward current exit / reverse blocking terminal	Marked with band; ties to ground or lower-potential rail; carries full reverse voltage rating during off-state

Key Features

Feature	Design Value
Soft switching recovery	Low stored charge and controlled tail current reduce EMI generation and voltage ringing in hard-switched topologies
High surge current capability	20 A single-cycle surge rating protects against line transients and startup inrush in offline converters
175 °C maximum junction temperature	Enables reliable operation in enclosed, thermally constrained environments without derating below 1 A
Planar silicon process	Ensures consistent parameter distribution and long-term stability under thermal cycling and high-voltage stress

Applications

AC-DC Adapter Clamping

Flyback Snubber Network

Use Scenario: Clamp voltage spikes across primary-side MOSFET in 10–30 W universal-input flyback adapters.

IC Role / Device Role / Timing Role: Ultrafast rectifier providing low-loss, low-ringing clamp path during MOSFET turn-off.

Use Value: 75 ns t_rr and soft recovery limit V_DS overshoot to <10% above reflected output voltage, reducing MOSFET stress.

Use Scenario: Dissipate leakage energy in RCD snubber across transformer primary in industrial SMPS.

IC Role / Device Role / Timing Role: Fast-recovery diode conducting snubber capacitor discharge pulse with minimal delay and overshoot.

Use Value: 1.65 V V_F max at 125 °C ensures <1.7 W conduction loss during repeated 100 kHz snubber cycles.

Freewheeling Diode in DC-DC Converters

Input Rectification in Low-Power UPS

Use Scenario: Provide return path for inductor current during high-side switch off-time in 12 V input buck converters.

IC Role / Device Role / Timing Role: Unidirectional current path enabling continuous inductor current flow with minimal forward drop.

Use Value: 1 A I_F(AV) rating supports steady-state loads up to 12 W with <1.7 V total drop including PCB trace resistance.

Use Scenario: Rectify 230 V AC input prior to battery charging circuitry in standby-mode UPS systems.

IC Role / Device Role / Timing Role: High-voltage input stage rectifier handling 1200 V peak reverse stress during AC zero-crossing and surge events.

Use Value: V_RRM = 1200 V exceeds EN 61000-4-5 line surge requirements (±2 kV), ensuring no avalanche conduction under test.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast high-voltage rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R06	V_RRM = 600 V, t_rr = 50 ns, DO-41	Lower voltage rating limits use to ≤400 V AC input designs	Select when 600 V rating suffices and faster recovery (50 ns) is prioritized over 1200 V margin
UF4007	V_RRM = 1000 V, t_rr = 75 ns, same DO-41 package	Slightly lower V_RRM and higher V_F (1.7 V typ.) reduces efficiency margin	Acceptable for cost-sensitive 1000 V-class designs where 200 V headroom is acceptable

Compared with STTH112RL, STTH1R06 trades voltage headroom for marginally faster recovery, while UF4007 offers functional equivalence at lower cost but with reduced reverse voltage margin and higher conduction loss - making STTH112RL optimal for 1200 V-rated, thermally demanding freewheeling roles.

Availability

STTH112RL is available at Aetrix Electronics and suitable for AC-DC adapters, industrial SMPS snubbers, low-power UPS input stages, and flyback freewheeling circuits requiring stable component supply, DO-41 through-hole compatibility, and guaranteed 1200 V reverse blocking.

Supply support for STTH112RL 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STTH112RL belongs to ST's high-voltage ultrafast rectifier product line, engineered specifically for EMI-sensitive switching power applications requiring soft recovery, high surge tolerance, and extended thermal operating range.

FAQ

Is STTH112RL RoHS-compliant and halogen-free?

Yes. STTH112RL is manufactured in ST's ECOPACK®-compliant DO-41 package, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. The epoxy molding compound is UL 94 V-0 rated, and full compliance documentation is available via ST's quality portal.

What is the maximum allowable lead temperature during soldering?

The maximum lead temperature for STTH112RL is 260 °C for 10 seconds, per JEDEC J-STD-020. Wave soldering profiles must maintain peak temperature ≤260 °C at the lead-to-body interface; hand soldering requires ≤350 °C tip temperature for <3 seconds per lead to avoid internal delamination.

Does STTH112RL support automated optical inspection (AOI) after placement?

Yes. The DO-41 package's axial symmetry, consistent band marking, and defined cathode polarity enable reliable AOI detection. ST specifies band width and position tolerances per Table 7 (Doc ID 9343 Rev 5), supporting machine vision algorithms for polarity and placement verification in SMT lines using tape-and-reel delivery (5000 pcs/reel).

How does STTH112RL's thermal resistance compare between DO-41 and SMB variants?

STTH112RL (DO-41) has R_th(j-l) = 45 °C/W (L = 10 mm), while the SMB-packaged STTH112U has R_th(j-l) = 25 °C/W. The SMB variant achieves lower thermal resistance due to shorter internal lead paths and larger copper pad contact area - but STTH112RL's DO-41 form remains preferred for through-hole reliability and mechanical robustness in high-vibration environments.

STTH112RL Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1200 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.9 V @ 1 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 75 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 1200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

Operating Temperature - Junction:: 175°C (Max)

STTH112RL FAQ

1.How can I place an order for STTH112RL through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH112RL 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 STTH112RL reliable?

The price and inventory of STTH112RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH112RL is usually 5 days.

3.What payment methods are accepted for STTH112RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH112RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH112RL?

STTH112RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH112RL 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 STTH112RL?

For technical support, including STTH112RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH112RL requirements.

6.How does Aetrix verify that STTH112RL is sourced from the original manufacturer or authorized distributors?

All STTH112RL 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 STTH112RL meets industry standards.

7.What is the process for return or replacement of STTH112RL?

All STTH112RL units undergo pre-shipment inspection (PSI). If there is an issue with STTH112RL, 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 STTH112RL part is unused and in its original packaging.

Return procedure for STTH112RL:

1.Submit a request within 90 days.

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

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