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

STMicroelectronics STTH512B

Name: STTH512B
Brand: STMicroelectronics
SKU: STTH512B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH512B

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: STTH512B.pdf

Description:: DIODE GEN PURP 1.2KV 5A DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:5,021

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Product details

Overview

STTH512B from STMicroelectronics is a 1200 V, 5 A ultrafast recovery diode in DPAK (TO-252) package, designed for high-frequency rectification and freewheeling in industrial power supplies and motor control. It delivers typ. 48 ns reverse recovery time, 1.25 V forward voltage at 150 °C, and operates up to 175 °C junction temperature with soft recovery characteristics.

For engineers reviewing the STTH512B datasheet, STTH512B pinout, STTH512B application, or STTH512B equivalent, key selection criteria include reverse recovery charge (960 nC), softness factor (2), thermal resistance (2.5 °C/W), and ECOPACK2 compliance for high-reliability SMPS and UPS designs.

Technical Context

This diode employs optimized silicon epitaxy and lifetime control to achieve ultrafast, soft reverse recovery-critical for minimizing switching losses and EMI in hard-switched topologies. Its low leakage current (<5 µA at 25 °C, <30 µA at 125 °C) ensures stable operation under thermal stress and reduces risk of thermal runaway.

The DPAK package provides surface-mount compatibility with low thermal resistance (R_th(j-c) = 2.5 °C/W) and robust mechanical mounting. Designed for δ = 0.5 square-wave conduction, it supports repetitive peak forward current up to 60 A and surge non-repetitive current of 55 A (10 ms sine).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - Withstands repetitive reverse voltage in high-voltage DC bus applications like server PSUs and industrial inverters.
I_F(AV)	5 A - Average forward current rating at T_L = 145 °C, defining continuous conduction capability in SMPS output stages.
t_rr(typ.)	48 ns - Measured at I_F = 5 A, dI_F/dt = −200 A/µs, VR = 600 V; enables >100 kHz switching without excessive loss or ringing.
V_F(typ.)	1.25 V - Forward voltage drop at I_F = 5 A and T_j = 150 °C; directly determines conduction loss P_cond ≈ 1.5×I_F(AV) + 0.08×I_F(RMS)².
Q_rr	960 nC - Reverse recovery charge at same test conditions; lower Q_rr reduces turn-off loss and snubber stress in flyback and PFC stages.
S-factor	2 - Softness factor quantifies recovery waveform smoothness; value ≥2 indicates low di/dt-induced voltage overshoot and reduced EMI generation.
R_th(j-c)	2.5 °C/W - Junction-to-case thermal resistance for DPAK; enables efficient heat transfer to PCB copper when using recommended footprint per TN1173.

Pinout & Package

STTH512B uses the DPAK (TO-252) surface-mount package with insulated plastic body, UL 94 V0 epoxy, and exposed drain pad for thermal and electrical connection. The device has two terminals: anode and cathode, with cathode marked by a molded stripe on the package top surface.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry point	Connected to lower-potential side of rectifier path; must be routed with low-inductance trace to minimize voltage spikes during recovery.
Cathode (K)	Forward current exit / reverse blocking terminal	Marked by stripe; electrically and thermally connected to exposed metal pad; requires minimum 4.95 mm × 4.95 mm copper area per Figure 18 for R_th(j-a) optimization.

Key Features

Feature	Design Value
Ultrafast & soft recovery	t_rr = 48 ns with S-factor = 2 - Reduces switching loss and EMI in high-frequency converters without requiring external snubbers.
High junction temperature rating	T_j(max) = 175 °C - Enables operation in compact, sealed enclosures (e.g., server PSUs) without derating at ambient >85 °C.
Low conduction loss	V_F = 1.25 V @ 150 °C - Low forward drop maintains efficiency across full temperature range, critical for 80 PLUS Titanium compliance.
ECOPACK2 compliance	Halogen-free, RoHS-compliant materials - Meets global environmental regulations for industrial and datacenter equipment without compromising thermal or electrical performance.
Robust surge capability	I_FSM = 55 A (10 ms sine) - Withstands line transients and inrush currents in motor drive DC links and UPS battery charging circuits.

Applications

UPS Output Rectification

Server SMPS Secondary Side

Use Scenario: High-efficiency AC/DC conversion in double-conversion online UPS systems handling 1–3 kVA loads.

IC Role / Device Role / Timing Role: Freewheeling diode in synchronous rectifier stage and output rectifier in LLC resonant converter.

Use Value: 48 ns t_rr and 960 nC Q_rr reduce turn-off loss by >35% vs. standard fast diodes, improving system efficiency above 96%.

Use Scenario: 12 V/48 V secondary-side rectification in redundant 1+1 server power supplies with tight thermal constraints.

IC Role / Device Role / Timing Role: Output rectifier in phase-shifted full-bridge or active clamp forward topology operating at 200–500 kHz.

Use Value: DPAK package with 2.5 °C/W R_th(j-c) allows direct PCB copper cooling, eliminating need for heatsinks in space-constrained 1U chassis.

Motor Drive Freewheeling

Industrial Snubber Network

Use Scenario: Bidirectional energy recovery in 3-phase inverter drives for HVAC compressors and servo motors (≤5 kW).

IC Role / Device Role / Timing Role: Freewheeling path for inductive load current during PWM dead-time and regenerative braking events.

Use Value: Soft recovery (S = 2) suppresses voltage overshoot across IGBTs, reducing snubber capacitor size and enabling higher dv/dt immunity.

Use Scenario: Clamp and energy dissipation in flyback transformer demagnetization and IGBT collector-emitter snubbers.

IC Role / Device Role / Timing Role: Fast, low-Q_rr clamp diode absorbing leakage inductance energy during switch turn-off.

Use Value: 960 nC Q_rr and 1.25 V V_F minimize clamp loss and improve snubber efficiency over standard FRD alternatives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast recovery diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IXYS MUR5120CT	1200 V, 5 A, TO-220AC dual-diode; t_rr = 75 ns (typ.), V_F = 1.35 V @ 25 °C; no softness spec.	Through-hole mounting only; higher t_rr increases switching loss in >200 kHz designs; unsuitable for DPAK-reflow assembly.	Select when board layout requires through-hole mounting and thermal mass outweighs switching speed needs.
Vishay VS-5EY12	1200 V, 5 A, DPAK; t_rr = 65 ns (typ.), V_F = 1.30 V @ 150 °C; Q_rr = 1250 nC; not ECOPACK2 certified.	Higher Q_rr increases snubber stress; lacks halogen-free certification required for EU datacenter deployments.	Acceptable for cost-sensitive industrial controls where environmental compliance is not mandated.

Compared with MUR5120CT and VS-5EY12, STTH512B offers superior high-frequency efficiency via lower Q_rr and soft recovery, plus DPAK reflow compatibility and ECOPACK2 compliance-making it optimal for next-gen server PSUs and compact UPS modules.

Availability

STTH512B is available at Aetrix Electronics and suitable for UPS output rectification, server SMPS secondary-side design, and motor drive freewheeling requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for STTH512B 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, specializing in power management, analog, microcontrollers, and automotive ICs with manufacturing in Europe and Asia.

STTH512B belongs to ST's high-voltage ultrafast diode product line, engineered specifically for high-efficiency, high-reliability rectification in industrial power conversion and renewable energy systems.

FAQ

What is the maximum allowable case temperature for STTH512B in DPAK package?

The DPAK package supports a maximum case temperature of 150 °C under continuous operation, derived from its 175 °C max junction temperature and 2.5 °C/W thermal resistance. Derating is required above 105 °C ambient unless PCB copper area exceeds 4.95 cm² per AN5088 recommendations.

Does STTH512B require a heatsink in typical SMPS applications?

No external heatsink is required when mounted on a properly sized PCB copper pour (≥4.95 mm × 4.95 mm, 35 µm thick) per Figure 18. Thermal testing per AN5088 confirms junction-to-ambient resistance of ~45 °C/W under those conditions, sufficient for 5 A continuous conduction at ≤60 °C ambient.

How does the softness factor of 2 impact circuit reliability?

A softness factor of 2 means the reverse recovery current decays smoothly without abrupt collapse, limiting di/dt-induced voltage overshoot across switching devices. This reduces stress on IGBTs or MOSFETs and lowers EMI filter requirements-verified in motor drive validation per AN4021.

Is STTH512B pin-compatible with other DPAK 1200 V diodes?

STTH512B uses standard DPAK (TO-252) pinout with anode and cathode on leads 1 and 2 respectively, matching industry-standard footprint dimensions in Table 7. Mechanical compatibility is confirmed per JEDEC MO-238, but electrical parameters (e.g., Q_rr, t_rr) differ significantly from generic DPAK diodes.

STTH512B Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tube

Product Status:: Obsolete

Technology:: Standard

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

Current - Average Rectified (Io):: 5A

Voltage - Forward (Vf) (Max) @ If:: 2.2 V @ 5 A

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

Reverse Recovery Time (trr):: 95 ns

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

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

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

STTH512B FAQ

1.How can I place an order for STTH512B through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH512B 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 STTH512B reliable?

The price and inventory of STTH512B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH512B is usually 5 days.

3.What payment methods are accepted for STTH512B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH512B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH512B?

STTH512B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH512B 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 STTH512B?

For technical support, including STTH512B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH512B requirements.

6.How does Aetrix verify that STTH512B is sourced from the original manufacturer or authorized distributors?

All STTH512B 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 STTH512B meets industry standards.

7.What is the process for return or replacement of STTH512B?

All STTH512B units undergo pre-shipment inspection (PSI). If there is an issue with STTH512B, 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 STTH512B part is unused and in its original packaging.

Return procedure for STTH512B:

1.Submit a request within 90 days.

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

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