STTH1R04RL Equivalent & Substitute Parts

Part Overview

The STTH1R04RL is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 400 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The diode features fast recovery characteristics with a 30 ns reverse recovery time, suitable for standard rectification applications requiring 400 V operation.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	30 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature - Junction (Max)	175°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the STTH1R04RL are grouped based on the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The main part operates at 400 V DC reverse voltage. Substitute parts are categorized into two groups: those maintaining 400 V operation (direct voltage equivalents) and those rated at lower voltages (200 V), which are suitable only for applications with reduced voltage requirements.

Current Rating: All substitute parts maintain the 1 A average rectified current specification, ensuring compatibility with existing circuit designs.

Package and Mounting: All substitute parts use through-hole mounting in DO-41 or DO-204AL (equivalent) packages, maintaining mechanical and electrical interface compatibility.

Speed Classification: All substitute parts meet the fast recovery specification (≤ 500ns for currents > 200mA), ensuring switching performance consistency.

Reverse Recovery Time (trr): While the main part specifies 30 ns, substitute parts range from 45 ns to 200 ns. Parts with trr ≤ 75 ns maintain performance characteristics suitable for fast recovery applications.

Compliance and Status: Active product status and ROHS3 compliance are prioritized for long-term availability and regulatory adherence.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr (ns)	Ir @ Vr	Package	Status
STTH1R04RL	STMicroelectronics	400 V	1 A	1.5 V @ 1 A	30	5 µA @ 400 V	DO-41	Obsolete
UF4004G	SMC Diode Solutions	400 V	1 A	—	50	5 µA @ 400 V	DO-41	Active
MUR140RLG	onsemi	400 V	1 A	1.25 V @ 1 A	75	5 µA @ 400 V	Axial	Active
MUR140GP-TP-HF	Micro Commercial Co	400 V	1 A	1.35 V @ 1 A	45	5 µA @ 400 V	DO-41	Active
1N4935-T	Diodes Incorporated	200 V	1 A	1.2 V @ 1 A	200	5 µA @ 200 V	DO-41	Active
1N4935G	Taiwan Semiconductor Corporation	200 V	1 A	1.2 V @ 1 A	200	5 µA @ 200 V	DO-204AL	Active
1N4935G-T	Diodes Incorporated	200 V	1 A	1.2 V @ 1 A	200	5 µA @ 200 V	DO-41	Active

Engineering Selection Recommendations

Primary Substitutes (400 V Voltage Rating):

The following parts provide direct voltage equivalence to the STTH1R04RL and are suitable for applications requiring 400 V operation:

UF4004G (SMC Diode Solutions) is an active product with 400 V rating, 1 A current, and 50 ns reverse recovery time. This part maintains fast recovery performance and is ROHS3 compliant. High inventory availability (29,401 pcs) supports procurement continuity.

MUR140GP-TP-HF (Micro Commercial Co) operates at 400 V with 1 A current and 45 ns reverse recovery time. Forward voltage is 1.35 V @ 1 A. This part is active and suitable for applications requiring fast switching characteristics.

MUR140RLG (onsemi) provides 400 V operation with 1 A current in an axial package configuration. Reverse recovery time is 75 ns, and forward voltage is 1.25 V @ 1 A. This part is active, ROHS3 compliant, and rated to 175°C junction temperature, matching the original specification.

Secondary Substitutes (200 V Voltage Rating):

The following parts operate at reduced voltage (200 V) and are suitable only for applications where the circuit voltage requirement does not exceed 200 V:

1N4935-T (Diodes Incorporated) is supplied in cut tape packaging with 200 V rating and 1 A current. Reverse recovery time is 200 ns. This part is active and ROHS3 compliant.

1N4935G (Taiwan Semiconductor Corporation) provides 200 V operation with 1 A current in DO-204AL package. Reverse recovery time is 200 ns. This part is active with unlimited moisture sensitivity level.

1N4935G-T (Diodes Incorporated) is supplied in tape and reel packaging with 200 V rating and 1 A current. Reverse recovery time is 200 ns. This part is active and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can I use a 200 V rated diode in place of the STTH1R04RL in a 400 V application?

A: No. The 200 V rated substitutes (1N4935 series) are not suitable for applications requiring 400 V operation. Using an undersized voltage rating diode will result in device failure and potential circuit damage. Use only 400 V rated alternatives: UF4004G, MUR140GP-TP-HF, or MUR140RLG.

Q: What is the difference between DO-41 and DO-204AL packages?

A: DO-41 and DO-204AL are equivalent package designations for the same through-hole axial lead diode form factor. Both packages are mechanically and electrically interchangeable. Some manufacturers use DO-41 nomenclature while others use DO-204AL; the physical dimensions and lead spacing are identical.

Q: Does the reverse recovery time difference between STTH1R04RL (30 ns) and substitute parts affect circuit performance?

A: Reverse recovery time differences within the fast recovery classification (≤ 500ns) typically do not significantly impact standard rectification circuits. However, in high-frequency switching applications or precision timing circuits, the longer recovery times of 1N4935 series (200 ns) may introduce measurable delays. For applications sensitive to switching speed, select UF4004G (50 ns), MUR140GP-TP-HF (45 ns), or MUR140RLG (75 ns).

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts listed are ROHS3 compliant. UF4004G carries REACH Affected status, while all others are REACH Unaffected. Verify compliance requirements for your specific application and regulatory jurisdiction before final selection.

Q: What is the significance of the forward voltage (Vf) specification?

A: Forward voltage determines the voltage drop across the diode during conduction. The STTH1R04RL specifies 1.5 V @ 1 A. Substitute parts range from 1.2 V to 1.35 V @ 1 A. Lower forward voltage reduces power dissipation and heat generation. For applications with tight thermal budgets, select parts with lower Vf ratings such as 1N4935 series (1.2 V) or MUR140RLG (1.25 V).

Q: Can I substitute an axial package diode (MUR140RLG) for a radial DO-41 package diode?

A: Axial and radial packages have different lead configurations. MUR140RLG uses axial leads (both leads on the same axis), while DO-41 uses radial leads. These are not mechanically interchangeable on standard PCB layouts. Verify your PCB footprint design before selecting an axial package alternative.

Q: What inventory considerations should I account for when selecting a substitute?

A: Inventory availability varies significantly among substitutes. UF4004G has the highest inventory (29,401 pcs), while 1N4935G has the lowest (789 pcs). For long-term production requirements, prioritize parts with higher inventory levels to ensure supply chain continuity.

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