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

STMicroelectronics STTH1R04

Name: STTH1R04
Brand: STMicroelectronics
SKU: STTH1R04
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH1R04

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: STTH1R04.pdf

Description:: DIODE GEN PURP 400V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:2,552

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Product details

Overview

STTH1R04 from STMicroelectronics is a 1 A, 400 V ultrafast recovery diode using platinum-doped planar technology, optimized for switching-mode base drive and transistor circuits in low-voltage, high-frequency inverters, freewheeling, and polarity protection. It delivers typ. 0.9 V forward voltage at 150 °C, 14 ns reverse recovery time at 100 A/µs, and operates up to 175 °C junction temperature.

For engineers reviewing the STTH1R04 datasheet, STTH1R04 pinout, STTH1R04 application, or STTH1R04 equivalent, key selection criteria include ultrafast trr (14–30 ns), low VF across temperature (0.9–1.25 V), high Tj rating (175 °C), thermal resistance (25–50 °C/W depending on package), and ECOPACK-compliant SMA/SMB/DO-15 packaging options.

Technical Context

The STTH1R04 employs platinum diffusion to achieve controlled carrier lifetime, enabling precise tuning of reverse recovery characteristics without compromising forward conduction loss. Its ultrafast trr (14 ns typ. at dIF/dt = −100 A/µs) and low IRM (≤3.5 A at 125 °C) minimize switching noise and EMI in hard-switched topologies.

Thermal performance is package-dependent: SMB offers lowest Rth(j-l) at 25 °C/W (TL = 140 °C), SMA at 35 °C/W (TL = 125 °C), and DO-15 at 50 °C/W (TL = 105 °C). All variants support surge current up to 30 A (10 ms sine half-cycle) and operate over −65 to +175 °C storage range.

Key Specifications

Parameter	Value and Actual Design Meaning
IF(AV)	1 A average forward current - supports continuous conduction in low-power SMPS output stages and gate-drive clamp circuits.
VRRM	400 V repetitive peak reverse voltage - enables use in 24–48 V DC bus systems with margin against transients and ringing.
trr (typ.)	14 ns at IF = 1 A, dIF/dt = −100 A/µs - reduces turn-off losses and dv/dt-induced crosstalk in synchronous rectifiers and IGBT snubbers.
VF (typ.)	0.9 V at Tj = 150 °C, IF = 1 A - lowers conduction loss and thermal stress in thermally constrained PCB layouts.
Tj(max.)	175 °C maximum junction temperature - allows operation in sealed enclosures or high-ambient industrial environments without derating.
IRM (max.)	3.5 A peak reverse recovery current at Tj = 125 °C - limits inductive kick and EMI generation during fast commutation.

Pinout & Package

STTH1R04 is available in three standard discrete diode packages: SMA (DO-214AC), SMB (DO-214AA), and DO-15. Each variant uses axial or surface-mount leads with cathode band marking. Pin/Terminal mapping is identical across packages: Anode (A) and Cathode (K).

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry point	Connected to lower-potential node (e.g., switch source/emitter or ground return); must handle full IF(AV) and IFSM.
Cathode (K)	Forward current exit / reverse blocking terminal	Marked by band; connects to higher-potential rail (e.g., DC bus or transformer secondary); withstands full VRRM during off-state.

Key Features

Feature	Design Value
Ultrafast recovery	trr = 14 ns typ. at 100 A/µs - enables >500 kHz switching in resonant converters without excessive switching loss.
Low VF across temperature	0.9 V typ. at 150 °C - maintains efficiency in high-temperature operation where silicon diodes typically degrade.
High junction temperature rating	175 °C max. Tj - eliminates need for oversized heatsinks in space-constrained telecom power supplies.
ECOPACK compliance	Lead-free, RoHS-compliant construction - meets EU Directive 2011/65/EU and supports green manufacturing requirements.

Applications

Telecom AC-DC Adapters

Industrial Motor Drive Freewheeling

Use Scenario: Secondary-side rectification in 48 V input telecom PSUs operating at 200–300 kHz.

IC Role / Device Role / Timing Role: Ultrafast output rectifier replacing slower FR-type diodes to reduce switching loss and improve efficiency.

Use Value: 14 ns trr cuts reverse recovery charge QRR by >60% vs. standard fast recovery diodes, lowering MOSFET VDS spikes and EMI filter size.

Use Scenario: Freewheeling path across IGBTs in 3-phase inverter legs driving HVAC compressors.

IC Role / Device Role / Timing Role: Clamp diode providing low-loss current recirculation during IGBT turn-off.

Use Value: 0.9 V VF at 150 °C reduces conduction loss by ~180 mW per diode vs. 1.08 V alternatives, directly improving thermal margin.

Automotive LED Driver Polarity Protection

UPS Inverter Output Stage

Use Scenario: Reverse polarity protection in 12 V automotive LED headlamp drivers exposed to load dump transients.

IC Role / Device Role / Timing Role: Series-connected anode-to-input diode blocking reverse battery connection.

Use Value: 400 V VRRM provides 3× margin over 14 V nominal + 35 V load dump, while 175 °C rating ensures reliability under hood temperatures.

Use Scenario: Synchronous rectification in 24 V DC input UPS inverters delivering clean 230 V AC output.

IC Role / Device Role / Timing Role: Low-loss freewheeling diode in half-bridge output stage during dead-time intervals.

Use Value: 30 A IFSM handles short-circuit current surges during grid fault conditions without catastrophic failure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MUR105	Same 1 A / 400 V rating but trr = 50 ns (typ.), VF = 1.25 V at 25 °C, Tj(max.) = 175 °C.	Higher trr increases switching loss in >200 kHz designs; suitable only where EMI constraints are relaxed.	Select when cost sensitivity outweighs efficiency targets and layout allows larger snubber networks.
Vishay VS-1EJ04-M3	1 A / 400 V, trr = 25 ns (typ.), VF = 1.05 V at 150 °C, DO-41 package only (no SMA/SMB).	Limited to through-hole assembly; lacks surface-mount variants needed for high-density telecom boards.	Choose only for legacy through-hole production or where DO-41 footprint compatibility is mandatory.

Compared with MUR105 and VS-1EJ04-M3, STTH1R04 uniquely combines sub-15 ns trr, <1.0 V VF at elevated temperature, and triple-package availability-enabling optimal trade-offs between efficiency, thermal management, and board assembly flexibility.

Availability

STTH1R04 is available at Aetrix Electronics and suitable for telecom AC-DC adapters, industrial motor drive freewheeling, and automotive LED driver polarity protection requiring stable component supply and long-term lifecycle support.

Supply support for STTH1R04 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.

The STTH ultrafast diode product line targets high-efficiency power conversion in telecom, industrial, and automotive systems, emphasizing low-loss switching, thermal robustness, and environmental compliance.

FAQ

What is the maximum allowable lead temperature during soldering for STTH1R04 in SMB package?

The SMB package supports lead-free reflow soldering per JEDEC J-STD-020. Peak temperature must not exceed 260 °C for ≤10 seconds. Hand-soldering requires iron tip temperature ≤350 °C with contact time <3 seconds per lead to avoid epoxy degradation or die attach delamination.

Can STTH1R04 replace a standard PN junction diode like 1N4007 in a 50 Hz rectifier?

No - STTH1R04 is optimized for high-frequency switching (≥100 kHz), not line-frequency rectification. Its low trr and VF come at higher cost and unnecessary complexity for 50/60 Hz applications. The 1N4007 remains appropriate for low-speed, high-voltage, low-cost AC-DC front ends.

How does thermal resistance differ between SMA and SMB packages for STTH1R04?

SMB has Rth(j-l) = 25 °C/W (TL = 140 °C), while SMA is 35 °C/W (TL = 125 °C). This 40% lower thermal resistance makes SMB preferable for higher ambient or higher duty-cycle operation, provided PCB layout accommodates its larger footprint (5.6 × 4.6 mm vs. 5.35 × 4.8 mm).

Is STTH1R04 suitable for use in synchronous rectification circuits?

Yes - its 14 ns trr and low VF enable effective replacement of MOSFETs in low-current (<1 A) synchronous rectifier paths where gate drive complexity is undesirable. However, it cannot actively control conduction like a MOSFET; timing relies on natural current zero-crossing and circuit topology.

STTH1R04 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 1 A

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

Reverse Recovery Time (trr):: 30 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 400 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

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

STTH1R04 FAQ

1.How can I place an order for STTH1R04 through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH1R04 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 STTH1R04 reliable?

The price and inventory of STTH1R04 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH1R04 is usually 5 days.

3.What payment methods are accepted for STTH1R04?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH1R04 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH1R04?

STTH1R04 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH1R04 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 STTH1R04?

For technical support, including STTH1R04 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH1R04 requirements.

6.How does Aetrix verify that STTH1R04 is sourced from the original manufacturer or authorized distributors?

All STTH1R04 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 STTH1R04 meets industry standards.

7.What is the process for return or replacement of STTH1R04?

All STTH1R04 units undergo pre-shipment inspection (PSI). If there is an issue with STTH1R04, 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 STTH1R04 part is unused and in its original packaging.

Return procedure for STTH1R04:

1.Submit a request within 90 days.

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

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