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

STMicroelectronics STTH1210FP

Name: STTH1210FP
Brand: STMicroelectronics
SKU: STTH1210FP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH1210FP

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-220-2 Full Pack

Datasheet:: STTH1210FP.pdf

Description:: DIODE GEN PURP 1KV 12A TO220FPAC

Quantity:: RFQ Add To RFQ list

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Inventory:5,975

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Product details

Overview

STTH1210FP from STMicroelectronics is an ultrafast recovery, high-voltage silicon rectifier diode in TO-220FPAC insulated package, rated for 1000 V repetitive peak reverse voltage, 12 A average forward current (at Tc = 40 °C), and 48 ns typical reverse recovery time at 125 °C. It delivers low conduction loss (VF = 1.30 V typ. at 12 A, 150 °C) and soft recovery behavior (S factor = 2), making it suitable for high-frequency snubber circuits and freewheeling paths in industrial switch-mode power supplies.

For engineers reviewing the STTH1210FP datasheet, STTH1210FP pinout, STTH1210FP application, or STTH1210FP equivalent, key selection criteria include its 2500 VRMS electrical insulation rating, 12 pF junction capacitance, 5.4 °C/W junction-to-case thermal resistance, and validated performance under high dIF/dt (–200 A/µs) and high VR (600 V) conditions in motor control and auxiliary demagnetization functions.

Technical Context

This diode employs a platinum-doped lifetime-controlled silicon structure to achieve ultrafast, soft reverse recovery-critical for minimizing EMI and voltage overshoot in hard-switched topologies. Its softness factor of 2 ensures controlled minority-carrier recombination, reducing ringing during turn-off.

Designed for operation up to 175 °C junction temperature, it maintains stable leakage current (<30 µA at 125 °C, VR = 1000 V) and forward voltage (1.30–1.70 V across 25–150 °C), enabling reliable use in thermally constrained industrial environments without derating penalties typical of standard fast recovery diodes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1000 V - Withstands repetitive reverse voltage up to 1 kV without breakdown, enabling use in 800 V DC bus systems with safety margin.
I_F(AV)	12 A at T_c = 40 °C - Sustains continuous forward current in forced-air-cooled or heatsink-mounted configurations with moderate thermal interface resistance.
t_rr (typ)	48 ns at I_F = 12 A, dI_F/dt = –200 A/µs, V_R = 600 V, T_j = 125 °C - Enables switching frequencies >100 kHz in PFC and LLC resonant converters without excessive switching loss.
V_F (typ)	1.30 V at I_F = 12 A, T_j = 150 °C - Low conduction loss reduces power dissipation by ~15% vs. standard FRDs with VF >1.5 V at same condition.
R_th(j-c)	5.4 °C/W - Thermal path from junction to case allows direct mounting to heatsink; requires ≤2.7 W dissipation to stay within 175 °C T_j limit at 25 °C ambient.
Insulation	2500 V_RMS - Isolates high-side switching node from heatsink/chassis ground, eliminating need for insulating pads in TO-220FPAC footprint.
C_j	12 pF - Low junction capacitance minimizes displacement current during high dv/dt transitions, reducing gate drive loading in synchronous rectification circuits.

Pinout & Package

STTH1210FP uses the TO-220FPAC package: insulated plastic housing with metal tab electrically isolated from cathode terminal, 2500 V_RMS isolation rating, 12 pF junction capacitance, and recommended mounting torque of 0.55 N·m.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Forward current entry point	Connected to AC input or switching node; must withstand full reverse voltage when off; requires adequate creepage clearance on PCB.
Cathode (Lead 2)	Forward current exit / high-side reference	Common connection to output rail or controller ground; serves as return path for freewheeling current in buck/boost topologies.
Tab (Isolated Metal Surface)	Thermal interface only	Electrically floating; may be bolted directly to grounded heatsink without isolation hardware; enables simplified mechanical assembly and lower thermal resistance.

Key Features

Feature	Design Value
Ultrafast soft recovery	t_rr = 48 ns with S factor = 2 ensures minimal voltage overshoot and EMI generation during turn-off in hard-switched converters.
High-temperature operation	Rated for continuous operation at T_j = 175 °C, supporting compact designs in enclosed industrial enclosures without active cooling.
Low leakage current	I_R ≤ 30 µA at 125 °C, VR = 1000 V - reduces thermal runaway risk in parallel-connected configurations and improves system reliability over time.
Insulated TO-220FPAC package	2500 V_RMS isolation eliminates need for mica washers or silicone pads, lowering BOM cost and assembly complexity in high-voltage power stages.
High surge robustness	I_FSM = 80 A (10 ms sine) and I_FRM = 120 A (5 µs square) support repeated line transients and inrush current events in motor drives and UPS systems.

Applications

Industrial SMPS Rectification

Motor Drive Freewheeling

Use Scenario: Output rectification in 3 kW telecom rectifier with 400 V DC bus and 100 kHz switching frequency.

IC Role / Device Role / Timing Role: High-voltage output rectifier handling 12 A average current and absorbing reverse recovery energy during MOSFET turn-on.

Use Value: 48 ns t_rr and soft recovery reduce switching losses by 22% versus standard FRD, lowering heatsink requirements by one size grade.

Use Scenario: Freewheeling path across IGBT collector-emitter in 7.5 kW HVAC inverter driving PMSM motor.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during IGBT off-time; handles high di/dt (–200 A/µs) during commutation.

Use Value: 2500 V_RMS insulation allows direct mounting to shared heatsink, eliminating isolation hardware and reducing thermal interface resistance by 0.8 °C/W.

Snubber Network Diode

Bootstrap Supply Demagnetization

Use Scenario: RCD snubber across primary-side MOSFET in flyback converter operating at 65 kHz with 600 V clamp voltage.

IC Role / Device Role / Timing Role: Rapidly clamps voltage spike by conducting reverse recovery charge; must recover before next switching cycle.

Use Value: 12 pF C_j and 48 ns t_rr minimize snubber capacitor stress and enable tighter timing margins in high-frequency designs.

Use Scenario: Demagnetization path for bootstrap inductor in high-side gate driver IC powering 600 V half-bridge in BLDC controller.

IC Role / Device Role / Timing Role: Discharges inductor energy into V_CC rail during low-side conduction; must withstand 600 V reverse bias and recover within <100 ns.

Use Value: Soft recovery (S = 2) prevents voltage ringing on bootstrap rail, maintaining stable gate drive voltage and preventing shoot-through risk.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1210DI	Same die, TO-220Ins package: 2500 V_RMS isolation, 7 pF C_j, R_th(j-c) = 3.1 °C/W	Better thermal performance but larger footprint; requires longer mounting screw due to taller profile	Select when thermal resistance is prioritized over board space and mechanical height constraints.
STTH12R06	600 V V_RRM, 12 A I_F(AV), t_rr = 35 ns, non-insulated TO-220AC	Lower voltage rating; no electrical isolation; superior speed but unsuitable for 800–1000 V bus systems	Select only for 400–600 V DC bus applications where isolation is handled elsewhere and faster recovery is critical.

Compared with STTH1210DI, STTH1210FP trades 2.3 °C/W higher thermal resistance for smaller footprint and lower profile; compared with STTH12R06, it adds 400 V reverse voltage headroom and full isolation at the cost of 13 ns slower t_rr, making it optimal for 800 V industrial systems requiring both ruggedness and layout simplicity.

Availability

STTH1210FP is available at Aetrix Electronics and suitable for industrial power supplies, motor control inverters, and high-reliability snubber networks requiring stable component supply across multi-year production cycles.

Supply support for STTH1210FP 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STTH1210FP belongs to ST's Ultrafast Recovery Diode product line, engineered specifically for high-efficiency, high-reliability rectification and freewheeling in industrial power conversion systems operating at elevated temperatures and voltages.

FAQ

What is the maximum allowable junction temperature for STTH1210FP?

The absolute maximum operating junction temperature is 175 °C, verified per Table 1 in the official datasheet. This rating is sustained under continuous conduction with proper heatsinking; derating is not required below this limit when R_th(j-c) and ambient conditions are maintained within specification.

Does STTH1210FP require thermal interface material when mounted to a heatsink?

No thermal interface material is required for electrical isolation, as the TO-220FPAC tab is inherently insulated. However, thermally conductive paste or pad is strongly recommended between tab and heatsink to minimize R_th(c-hs) and ensure junction temperature remains within 175 °C under full load.

Can STTH1210FP replace STTH1210D in existing designs?

Yes, but only if electrical isolation is not required and thermal design accommodates the higher R_th(j-c) (5.4 vs. 1.9 °C/W). STTH1210FP's insulated tab eliminates need for insulating hardware, while its larger package height may affect mechanical fit in tight enclosures originally designed for TO-220AC.

What is the softness factor value and why does it matter?

The softness factor is 2, measured at I_F = 12 A, dI_F/dt = –200 A/µs, V_R = 600 V, T_j = 125 °C. A value >1 indicates gradual current decay during turn-off, suppressing voltage spikes and EMI-critical for meeting CISPR-22 Class B emissions limits in industrial equipment.

STTH1210FP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-2 Full Pack

Packaging:: Tube

Product Status:: Obsolete

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1000 V

Current - Average Rectified (Io):: 12A

Voltage - Forward (Vf) (Max) @ If:: 2 V @ 12 A

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

Reverse Recovery Time (trr):: 90 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 1000 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FPAC

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

STTH1210FP FAQ

1.How can I place an order for STTH1210FP through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH1210FP 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 STTH1210FP reliable?

The price and inventory of STTH1210FP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH1210FP is usually 5 days.

3.What payment methods are accepted for STTH1210FP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH1210FP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH1210FP?

STTH1210FP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH1210FP 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 STTH1210FP?

For technical support, including STTH1210FP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH1210FP requirements.

6.How does Aetrix verify that STTH1210FP is sourced from the original manufacturer or authorized distributors?

All STTH1210FP 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 STTH1210FP meets industry standards.

7.What is the process for return or replacement of STTH1210FP?

All STTH1210FP units undergo pre-shipment inspection (PSI). If there is an issue with STTH1210FP, 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 STTH1210FP part is unused and in its original packaging.

Return procedure for STTH1210FP:

1.Submit a request within 90 days.

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

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