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

STMicroelectronics STTH1R04RL

Name: STTH1R04RL
Brand: STMicroelectronics
SKU: STTH1R04RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH1R04RL

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: STTH1R04RL.pdf

Description:: DIODE GEN PURP 400V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:7,059

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Product details

Overview

STTH1R04RL from STMicroelectronics is a 1 A, 400 V ultrafast recovery diode in DO-15 package, engineered for low-loss switching in base-drive and transistor circuits. 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 - ideal for telecom power supplies and high-frequency inverters.

For engineers reviewing the STTH1R04RL datasheet, STTH1R04RL pinout, STTH1R04RL application, or STTH1R04RL equivalent, key selection criteria include ultrafast trr performance, thermal robustness to 175 °C, DO-15 mechanical compatibility, and conduction loss modeling using P = 0.9 × IF(AV) + 0.250 × IF²(RMS).

Technical Context

This diode employs ST's planar platinum-doped silicon technology to achieve ultrafast recovery with minimal stored charge (QRR < 20 nC at 125 °C), enabling efficient operation in hard-switched SMPS topologies. Its low VF and high dIF/dt tolerance (up to 200 A/µs) support fast turn-on and reduced forward recovery overshoot.

The DO-15 variant (STTH1R04RL) features a 50 °C/W junction-to-lead thermal resistance and 6000-piece tape-and-reel packaging. It is rated for 30 A non-repetitive surge current and maintains stable IR ≤ 50 µA at 125 °C under full 400 V reverse bias.

Key Specifications

Parameter	Value and Actual Design Meaning
IF(AV)	1 A average forward current - supports continuous conduction in low-power DC-DC stages and auxiliary rails
VRRM	400 V repetitive peak reverse voltage - suitable for 28 V–48 V telecom input rectification with margin
trr(typ.)	14 ns at IF = 1 A, dIF/dt = −100 A/µs - enables >1 MHz switching without excessive switching loss
VF(typ.)	0.9 V at IF = 1 A, Tj = 150 °C - reduces conduction loss by ~25% vs. standard FR diodes at elevated temperature
Tj(max.)	175 °C maximum junction temperature - allows compact heatsinking in sealed telecom enclosures
Rth(j-l)	50 °C/W junction-to-lead - defines thermal path for lead-mounted PCB designs without external heatsink
IRM(max.)	3.5 A peak reverse recovery current - constrains snubber sizing in flyback and forward converters

Pinout & Package

STTH1R04RL is housed in a DO-15 axial-leaded package with cathode band marking. The device has two terminals: anode and cathode - no internal connections or control pins.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of circuit; must withstand surge current up to 30 A (tp = 10 ms)
Cathode	Forward current exit / reverse blocking terminal	Marked with band; carries full reverse voltage (400 V) and hosts peak reverse recovery current (≤3.5 A)

Key Features

Feature	Design Value
Negligible switching losses	QRR < 20 nC at 125 °C and 320 V - minimizes energy dissipated during turn-off in high-frequency converters
Low forward voltage drop	VF = 0.9 V @ 1 A, 150 °C - lowers steady-state power loss and thermal stress in space-constrained telecom modules
High junction temperature rating	Tj(max.) = 175 °C - permits operation in sealed, fanless telecom power supplies without derating
ECOPACK compliant	Lead-free, RoHS-compliant construction - meets EU environmental directives for industrial and telecom equipment
DO-15 mechanical standardization	Standard axial footprint (A = 6.05–6.75 mm, B = 2.95–3.53 mm) - ensures compatibility with legacy through-hole assembly lines

Applications

Telecom AC-DC Adapters

Industrial DC-DC Auxiliary Supplies

Use Scenario: Rectifying 48 V input in isolated offline adapters for base station power modules.

IC Role / Device Role / Timing Role: Ultrafast freewheeling diode in active clamp forward converter secondary-side synchronous rectification.

Use Value: 14 ns trr prevents cross-conduction loss with MOSFET gate drivers; 175 °C rating avoids thermal shutdown during burst-mode operation.

Use Scenario: Output rectification in 12 V/1 A isolated DC-DC converters powering PLC I/O modules.

IC Role / Device Role / Timing Role: Low-VF output diode replacing Schottky in cost-sensitive industrial designs where 400 V VR margin is required.

Use Value: 0.9 V VF at 150 °C reduces conduction loss by 0.15 W vs. 1.05 V alternatives - extends MTBF in unventilated enclosures.

Automotive Body Control Modules

LED Driver Flyback Circuits

Use Scenario: Reverse polarity protection and load dump clamping in 24 V BCM power inputs.

IC Role / Device Role / Timing Role: High-surge (30 A) axial diode absorbing ISO 7637-2 pulse 5a transients.

Use Value: DO-15 mechanical ruggedness and 175 °C rating ensure reliability across −40 °C to +105 °C ambient with no derating.

Use Scenario: Secondary-side rectification in 36 V constant-current LED drivers for street lighting.

IC Role / Device Role / Timing Role: Fast-recovery output diode minimizing ringing and EMI in discontinuous conduction mode flyback.

Use Value: 30 ns max trr at 50 A/µs suppresses voltage spikes >400 V, eliminating need for TVS clamping on secondary winding.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1L04RL	1 A, 400 V, DO-15, but uses low-leakage process: IR ≤ 1 µA @ 125 °C (vs. 50 µA for STTH1R04RL)	Better suited for high-impedance bias networks and precision hold-up circuits where leakage matters	Select when reverse leakage dominates system standby loss; trade-off is slightly higher VF (1.05 V typ. @ 150 °C)
BYV26E-TAP	1 A, 400 V, DO-41, trr = 25 ns (typ.), VF = 1.15 V @ 150 °C, Rth(j-l) = 60 °C/W	Higher thermal resistance and slower recovery limit use in >500 kHz designs	Acceptable for cost-driven 100–300 kHz telecom adapters where layout allows larger heatsinking

Compared with STTH1R04RL, STTH1L04RL trades 150 mV higher VF for 50× lower leakage, while BYV26E-TAP offers broader distributor availability but requires 20% more board area and sacrifices 43% in recovery speed - making STTH1R04RL optimal for thermally constrained, high-frequency telecom rectification.

Availability

STTH1R04RL is available at Aetrix Electronics and suitable for telecom power supplies, industrial DC-DC converters, and automotive body control modules requiring stable component supply and long-term manufacturing continuity.

Supply support for STTH1R04RL 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The STTH1R04 series belongs to ST's high-voltage ultrafast diode product line, developed specifically for high-efficiency, high-frequency power conversion in telecom infrastructure and industrial SMPS where low QRR and thermal resilience are critical.

FAQ

What is the maximum allowable lead temperature during soldering for STTH1R04RL?

The DO-15 package supports wave soldering per JEDEC J-STD-020. Peak lead temperature must not exceed 260 °C for ≤10 seconds. Preheating to 100–150 °C for 60–120 seconds is recommended to avoid thermal shock. ST specifies no reflow profile since it is not a surface-mount device.

Can STTH1R04RL replace a Schottky diode in a 48 V input converter?

Yes - but only where reverse voltage exceeds 30 V. STTH1R04RL's 400 V VRRM provides ample margin over 48 V systems, and its 0.9 V VF at 150 °C approaches Schottky performance while offering superior temperature stability and no reverse recovery tail current. It is preferred when operating above 125 °C.

How does STTH1R04RL's thermal resistance compare across package variants?

In DO-15 (STTH1R04RL), Rth(j-l) = 50 °C/W; SMB (STTH1R04U) is 25 °C/W; SMA (STTH1R04A) is 35 °C/W. The DO-15's higher value reflects its axial-leaded construction and longer thermal path - acceptable for <1 W dissipation with adequate PCB copper area, but less suitable than SMB for high-density SMT layouts.

Is STTH1R04RL suitable for use in automotive ADAS power supplies?

Yes - it meets AEC-Q101 stress test requirements for discrete semiconductors when qualified per ST's automotive-grade variants (e.g., STTH1R04AG). While STTH1R04RL is industrial-grade, its 175 °C Tj(max.), 30 A IFSM, and ECOPACK compliance make it viable for non-safety-critical ADAS subsystems like camera module power, provided full qualification documentation is obtained from ST.

STTH1R04RL Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

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)

STTH1R04RL FAQ

1.How can I place an order for STTH1R04RL through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH1R04RL 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 STTH1R04RL reliable?

The price and inventory of STTH1R04RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH1R04RL is usually 5 days.

3.What payment methods are accepted for STTH1R04RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH1R04RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH1R04RL?

STTH1R04RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH1R04RL 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 STTH1R04RL?

For technical support, including STTH1R04RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH1R04RL requirements.

6.How does Aetrix verify that STTH1R04RL is sourced from the original manufacturer or authorized distributors?

All STTH1R04RL 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 STTH1R04RL meets industry standards.

7.What is the process for return or replacement of STTH1R04RL?

All STTH1R04RL units undergo pre-shipment inspection (PSI). If there is an issue with STTH1R04RL, 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 STTH1R04RL part is unused and in its original packaging.

Return procedure for STTH1R04RL:

1.Submit a request within 90 days.

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

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