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

STMicroelectronics STTH1R04U

Name: STTH1R04U
Brand: STMicroelectronics
SKU: STTH1R04U
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH1R04U

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: STTH1R04U.pdf

Description:: DIODE GEN PURP 400V 1A SMB

Quantity:: RFQ Add To RFQ list

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Inventory:10,398

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Product details

Overview

STTH1R04U from STMicroelectronics is a 1 A, 400 V ultrafast recovery rectifier diode in SMB package, featuring 14 ns typical reverse recovery time (trr), 0.9 V typical forward voltage (VF) at 150 °C, and 175 °C maximum junction temperature - optimized for high-frequency switching in telecom power supplies and base-drive circuits.

For engineers reviewing the STTH1R04U datasheet, STTH1R04U pinout, STTH1R04U application, or STTH1R04U equivalent, key selection criteria include trr ≤ 30 ns at 100 A/µs dIF/dt, thermal resistance Rth(j-l) = 25 °C/W (SMB), and ECOPACK-compliant lead-free construction for industrial-grade reliability.

Technical Context

This ultrafast diode employs ST's planar platinum-doped silicon technology to achieve low conduction loss (VF = 0.9–1.25 V across 25–150 °C) and tightly controlled reverse recovery behavior (trr = 14 ns typ., 30 ns max. at 50 A/µs). Its dynamic performance supports hard-switched topologies up to several hundred kHz.

The device operates with negligible switching losses due to minimal stored charge (QRR < 20 nC at 100 A/µs, Tj = 125 °C) and low IRM (≤3.5 A peak reverse recovery current), enabling efficient freewheeling and polarity protection in compact DC-DC converters and SMPS front-ends.

Key Specifications

Parameter	Value and Actual Design Meaning
IF(AV)	1 A average forward current - supports continuous conduction in low-power SMPS outputs
VRRM	400 V repetitive peak reverse voltage - suitable for 28 V–48 V telecom input stages with margin
trr (typ.)	14 ns at IF = 1 A, dIF/dt = −100 A/µs, VR = 30 V - enables stable operation in >300 kHz switching circuits
VF (typ.)	0.9 V at IF = 1 A, Tj = 150 °C - reduces conduction loss and thermal stress in high-temp environments
Tj(max.)	175 °C maximum junction temperature - allows derating flexibility in sealed enclosures or high ambient conditions
Rth(j-l)	25 °C/W (SMB package) - defines thermal path efficiency from die to PCB copper land
IRM (max.)	3.5 A peak reverse recovery current at Tj = 125 °C - constrains snubber sizing and EMI filter design

Pinout & Package

SMB (Surface Mount Diode) package: 2-terminal, cathode-banded, gull-wing leads; dimensions per ST DS5848 Rev 4: D = 3.30–3.95 mm, E = 5.10–5.60 mm, E1 = 4.05–4.60 mm, L = 0.75–1.50 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck freewheel path)
Cathode	Forward current exit / reverse blocking terminal	Marked with band; ties to output rail or ground return in polarity protection

Key Features

Feature	Design Value
Negligible switching losses	QRR < 20 nC and trr ≤ 30 ns minimize energy dissipation during turn-off transitions
Low forward voltage drop	VF = 0.9 V (typ.) at 150 °C reduces steady-state I²R heating in high-duty-cycle operation
High junction temperature rating	175 °C Tj(max.) enables use in thermally constrained telecom modules without forced air
ECOPACK compliance	Lead-free, RoHS-compliant SMB package meets EU environmental directives for industrial deployment

Applications

Telecom Power Supply

Motor Drive Freewheeling

Use Scenario: Secondary-side rectification in 48 V input telecom DC-DC converters operating at 200–500 kHz.

IC Role / Device Role / Timing Role: Ultrafast recovery diode providing low-loss freewheel path during MOSFET off-time.

Use Value: 14 ns trr and 0.9 V VF reduce switching loss by >35% vs. standard fast recovery diodes, improving efficiency at full load.

Use Scenario: Clamp diode across brushed DC motor windings in industrial actuator control boards.

IC Role / Device Role / Timing Role: Polarity protection and inductive kickback suppression during PWM commutation.

Use Value: 175 °C Tj rating ensures reliability under intermittent stall conditions where winding temps exceed 150 °C.

Base-Drive Protection

LED Driver Polarity Guard

Use Scenario: Reverse-voltage clamp on NPN/PNP transistor base drive lines in isolated gate driver circuits.

IC Role / Device Role / Timing Role: Fast-turn-off diode preventing base-emitter reverse breakdown during transient coupling.

Use Value: 3.5 A IRM peak and 14 ns trr allow clean clamping without oscillation or latch-up in sub-100 ns edge-driven systems.

Use Scenario: Input polarity protection for constant-current LED drivers in outdoor signage applications.

IC Role / Device Role / Timing Role: Series-connected ultrafast diode blocking reverse input during field wiring errors.

Use Value: 400 V VRRM provides 2× margin over 24 V nominal supply, while SMB footprint minimizes board area in space-constrained modules.

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 MUR140	400 V VRRM, 1 A IF(AV), trr = 50 ns (typ.), VF = 1.25 V (typ. @ 25 °C)	Higher trr increases switching loss in >200 kHz designs; less suitable for telecom SMPS	Select when cost sensitivity outweighs efficiency targets and thermal margin is ample
Vishay VS-1EJH04-M3	400 V VRRM, 1 A IF(AV), trr = 25 ns (typ.), VF = 0.95 V (typ. @ 125 °C), DO-214AA (SMA) package	SMA package has higher Rth(j-l) = 35 °C/W vs. SMB's 25 °C/W - impacts thermal headroom	Prefer for legacy SMA footprints; verify thermal derating in enclosed telecom modules

Compared with MUR140 and VS-1EJH04-M3, STTH1R04U delivers the lowest trr (14 ns) and best thermal resistance (25 °C/W) in SMB, making it optimal for high-frequency, thermally dense telecom and industrial power stages where both speed and thermal efficiency are critical.

Availability

STTH1R04U is available at Aetrix Electronics and suitable for telecom power supplies, motor drive freewheeling, and LED driver polarity protection requiring stable component supply and ECOPACK-compliant sourcing.

Supply support for STTH1R04U 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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

STTH1R04U belongs to ST's ultrafast recovery diode product line, engineered specifically for high-efficiency, high-frequency switching power conversion in telecom infrastructure and industrial automation equipment.

FAQ

What is the maximum allowable surge current for STTH1R04U?

The STTH1R04U supports a non-repetitive surge forward current (IFSM) of 30 A for 10 ms sinusoidal pulses, as specified in absolute ratings. This rating applies at Tj = 25 °C and assumes proper PCB copper area and thermal relief; derating is required above 25 °C ambient per the thermal resistance curve in DS5848 Figure 13.

Does STTH1R04U require a heatsink in typical SMB mounting?

No external heatsink is required for STTH1R04U in standard SMB mounting on FR4 with ≥1 cm² copper per lead, given its 25 °C/W junction-to-lead thermal resistance and 1 A average current rating. Thermal simulation using the Zth(j-l) curves (DS5848 Figures 4 and 13) confirms safe operation up to 175 °C junction temperature with adequate PCB copper area.

How does STTH1R04U's reverse leakage compare at high temperature?

At Tj = 125 °C and VR = VRRM, STTH1R04U exhibits reverse leakage current (IR) of 5–50 µA (max), per Table 3. This is significantly lower than standard fast recovery diodes and ensures minimal standby loss in high-temperature telecom chassis where ambient may reach 85 °C.

Can STTH1R04U replace older DO-15 diodes like STTH1R04Q in existing designs?

STTH1R04U (SMB) is not a direct mechanical replacement for STTH1R04Q (DO-15) due to different footprint, lead pitch, and thermal characteristics. While electrical specs match, the SMB package offers lower Rth(j-l) but requires rework of solder pads and stencil; redesign verification is needed for thermal and mechanical reliability.

STTH1R04U Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-214AA, SMB

Packaging:: Tape & Reel (TR)

Product Status:: Active

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:: Surface Mount

Supplier Device Package:: SMB

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

STTH1R04U FAQ

1.How can I place an order for STTH1R04U through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH1R04U 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 STTH1R04U reliable?

The price and inventory of STTH1R04U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH1R04U is usually 5 days.

3.What payment methods are accepted for STTH1R04U?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH1R04U transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH1R04U?

STTH1R04U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH1R04U 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 STTH1R04U?

For technical support, including STTH1R04U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH1R04U requirements.

6.How does Aetrix verify that STTH1R04U is sourced from the original manufacturer or authorized distributors?

All STTH1R04U 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 STTH1R04U meets industry standards.

7.What is the process for return or replacement of STTH1R04U?

All STTH1R04U units undergo pre-shipment inspection (PSI). If there is an issue with STTH1R04U, 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 STTH1R04U part is unused and in its original packaging.

Return procedure for STTH1R04U:

1.Submit a request within 90 days.

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

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