Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics STTH30S12W

Name: STTH30S12W
Brand: STMicroelectronics
SKU: STTH30S12W
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: STTH30S12W

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-247-2 (Straight Leads)

Datasheet:: STTH30S12W.pdf

Description:: DIODE GEN PURP 1.2KV 30A DO247

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,093

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

STTH30S12W from STMicroelectronics is an ultrafast high-voltage silicon rectifier diode in DO-247 package, rated for 1200 V repetitive peak reverse voltage (V_RRM), 30 A average forward current (I_F(AV)), and 35 ns typical reverse recovery time (t_rr). It serves as a boost-stage freewheeling/rectifying diode in UPS systems, solar inverters, and industrial SMPS where low conduction and switching losses are critical.

For engineers reviewing the STTH30S12W datasheet, STTH30S12W pinout, STTH30S12W application, or STTH30S12W equivalent, key selection criteria include its 1.9 V typical forward voltage at 150 °C, 0.95 °C/W junction-to-case thermal resistance, soft reverse recovery (S = 2), and suitability for high-frequency hard-switched topologies operating up to 175 °C junction temperature.

Technical Context

The STTH30S12W employs ST's Turbo 2 process to achieve ultrafast recovery with controlled softness-critical for minimizing EMI and voltage overshoot during turn-off in boost and PFC stages. Its low Q_RR (2900 nC) and low I_RM (17–24 A) reduce snubber stress and gate drive losses in IGBT/MOSFET-based converters.

Thermally optimized for conduction-cooled mounting, it delivers stable performance under δ = 0.5 duty cycle at T_c = 70 °C and supports surge currents up to 180 A (10 ms sine half-cycle), enabling robust operation during line transients and startup surges in uninterruptible power supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - Withstands peak reverse voltages in 1000 V DC bus applications without breakdown
I_F(AV)	30 A at T_c = 70 °C - Sustains continuous output current in high-power boost converters
t_rr (typ)	35 ns - Enables efficient operation at switching frequencies up to 100 kHz with minimal tail current loss
V_F (typ)	1.9 V at 30 A, 150 °C - Reduces conduction loss to ~57 W in 30 A steady-state operation
R_th(j-c)	0.95 °C/W - Allows direct heatsink mounting with predictable thermal rise under full load
Q_RR	2900 nC - Low recovered charge minimizes voltage spikes across switching devices during commutation
S factor	2 - Soft recovery limits dV/dt-induced ringing and EMI generation in noisy power environments

Pinout & Package

STTH30S12W uses a DO-247 through-hole package with an isolated metal tab (cathode-connected case) and two axial leads: Anode (A) and Cathode (K). Mounting requires 0.4–0.6 N·m torque on the M5 screw terminal for optimal thermal contact.

Pin/Terminal	Circuit Role	Design Meaning
Anode (lead)	Forward current entry point	Connected to input/switch node in boost topology; must withstand high dI/dt during turn-on
Cathode (tab)	Forward current exit / heat path	Electrically and thermally tied to heatsink; serves as primary return path and thermal interface

Key Features

Feature	Design Value
Ultrafast recovery	35 ns t_rr enables high-frequency PFC and DC-DC conversion without excessive switching loss
Low thermal resistance	0.95 °C/W R_th(j-c) supports >30 W dissipation with <30 °C rise above heatsink temperature
Soft reverse recovery	S = 2 ensures controlled turn-off with minimal voltage overshoot and reduced snubber requirements
High surge capability	180 A I_FSM (10 ms) accommodates inrush and fault currents in UPS and motor drives

Applications

Uninterruptible Power Supply (UPS)

Solar Photovoltaic Inverter

Use Scenario: Boost stage rectification in double-conversion online UPS with 1000 V DC link.

IC Role / Device Role / Timing Role: High-voltage freewheeling diode synchronizing with IGBT switching at 20–50 kHz.

Use Value: 35 ns t_rr and soft recovery suppress voltage spikes across IGBTs, reducing snubber size by 40% vs. standard fast diodes.

Use Scenario: DC-side boost rectifier in string inverters converting 600–1000 V PV array output.

IC Role / Device Role / Timing Role: Unidirectional current path during MPPT-controlled high-frequency PWM cycles.

Use Value: 1.9 V V_F at 150 °C lowers conduction loss by 12% over competing 1200 V diodes, improving full-load efficiency by 0.4%.

Industrial Switch-Mode Power Supply

Motor Drive DC Link

Use Scenario: Output rectification in 5–10 kW telecom rectifiers with active PFC front-end.

IC Role / Device Role / Timing Role: Secondary-side high-voltage diode handling 30 A average current at 100 kHz switching.

Use Value: 0.95 °C/W R_th(j-c) allows direct bolt-down heatsinking, eliminating thermal interface pads and reducing thermal stack-up by 2.1 K/W.

Use Scenario: Freewheeling path in 3-phase inverter DC link for HVAC compressors and pumps.

IC Role / Device Role / Timing Role: Clamp diode absorbing inductive kickback during IGBT turn-off.

Use Value: 2900 nC Q_RR limits reverse recovery energy to <1.5 mJ per cycle, preventing localized heating in high-dI/dt motor control.

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
IXYS MUR30120CT	TO-247 package, dual common-cathode configuration; 30 A avg, 1200 V, t_rr = 45 ns (typ)	Requires dual-diode layout; higher t_rr increases switching loss in >60 kHz designs	Prefer when dual-diode topology or PCB space constraints favor TO-247 footprint
Vishay VS-30EWH12	DO-247 package, same pinout; 30 A avg, 1200 V, t_rr = 40 ns (typ), V_F = 2.05 V (typ)	Nearly identical mechanical fit but higher forward drop increases conduction loss by ~4.5 W at 30 A	Acceptable for cost-sensitive designs where 0.15 V V_F penalty is tolerable

Compared with MUR30120CT and VS-30EWH12, STTH30S12W offers the lowest combined t_rr/V_F trade-off and superior softness (S = 2), making it optimal for EMI-sensitive, high-frequency UPS and solar inverter boost stages where thermal and electrical stress margins are tight.

Availability

STTH30S12W is available at Aetrix Electronics and suitable for uninterruptible power supplies, solar photovoltaic inverters, and industrial switch-mode power supplies requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for STTH30S12W 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 microcontrollers, power discrete devices, analog ICs, and MEMS sensors for industrial, automotive, and consumer markets.

The STTH series belongs to ST's Turbo 2 ultrafast diode product line, engineered specifically for high-efficiency, high-reliability rectification in high-voltage, high-frequency power conversion systems such as UPS, solar inverters, and industrial SMPS.

FAQ

What is the maximum junction temperature rating for STTH30S12W?

The STTH30S12W has a maximum operating junction temperature (T_j(max)) of 175 °C, validated per absolute ratings in Table 2 of the official datasheet. This rating enables reliable operation in high-ambient environments such as enclosed UPS cabinets or industrial enclosures without derating below full 30 A current at T_c = 70 °C.

Is STTH30S12W suitable for use in synchronous rectification topologies?

No-STTH30S12W is a unidirectional, non-controllable PN junction diode and lacks gate control required for synchronous rectification. It is designed for hard-switched freewheeling and boost rectification only. For synchronous designs, discrete MOSFETs or integrated SR controllers must be used instead.

Does STTH30S12W have a built-in thermal protection feature?

No, STTH30S12W does not include integrated thermal shutdown or sensing circuitry. As a passive discrete diode, thermal management relies entirely on external heatsinking and system-level monitoring. Its 175 °C T_j(max) rating and 0.95 °C/W R_th(j-c) require proper mechanical mounting and ambient airflow to prevent sustained overheating.

Can STTH30S12W replace older STTH30L12W in existing designs?

Yes-STTH30S12W supersedes STTH30L12W with improved t_rr (35 ns vs. 50 ns typ), lower V_F (1.9 V vs. 2.1 V at 30 A/150 °C), and enhanced softness (S = 2 vs. S ≈ 1.5). Pinout, package, and mounting are identical; no layout changes are needed, and performance improves in high-frequency or EMI-critical applications.

STTH30S12W Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-247-2 (Straight Leads)

Packaging:: Tube

Product Status:: Active

Technology:: Standard

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

Current - Average Rectified (Io):: 30A

Voltage - Forward (Vf) (Max) @ If:: 2.9 V @ 30 A

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 15 µA @ 1200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-247

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

STTH30S12W FAQ

1.How can I place an order for STTH30S12W through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH30S12W 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 STTH30S12W reliable?

The price and inventory of STTH30S12W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH30S12W is usually 5 days.

3.What payment methods are accepted for STTH30S12W?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH30S12W transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH30S12W?

STTH30S12W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH30S12W 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 STTH30S12W?

For technical support, including STTH30S12W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH30S12W requirements.

6.How does Aetrix verify that STTH30S12W is sourced from the original manufacturer or authorized distributors?

All STTH30S12W 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 STTH30S12W meets industry standards.

7.What is the process for return or replacement of STTH30S12W?

All STTH30S12W units undergo pre-shipment inspection (PSI). If there is an issue with STTH30S12W, 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 STTH30S12W part is unused and in its original packaging.

Return procedure for STTH30S12W:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…