SRV05-4HTG Equivalent & Substitute Parts

Part Overview

The SRV05-4HTG is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for rail-to-rail steering protection in surface mount applications. This part features a 6V reverse standoff voltage, 15V clamping voltage, and 10A peak pulse current capability in a compact SOT-23-6 package. The SRV05-4HTG is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal characteristics while accommodating available packaging and manufacturer options.

Key Parameters

Parameter	SRV05-4HTG	Unit
Voltage - Reverse Standoff (Typ)	6V (Max)	V
Voltage - Clamping (Max) @ Ipp	15V	V
Current - Peak Pulse (10/1000µs)	10A (8/20µs)	A
Power - Peak Pulse	150W	W
Type	Steering (Rail to Rail)	-
Unidirectional Channels	4	-
Operating Temperature	-40°C ~ 125°C (TJ)	°C
Package / Case	SOT-23-6	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the SRV05-4HTG is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 6V (Max) or compatible range
Voltage - Clamping (Max) @ Ipp: 15V or lower
Current - Peak Pulse (8/20µs): 10A or higher
Type: Steering (Rail to Rail)
Unidirectional Channels: 4
Package / Case: SOT-23-6 or SOT-23-6L
Mounting Type: Surface Mount
Operating Temperature Range: -40°C minimum to 125°C minimum

Secondary Compatibility Factors:

RoHS3 Compliance required
MSL Rating: 1 (Unlimited)
Power Line Protection capability

Substitute parts are grouped into two categories: direct functional equivalents (matching all primary criteria) and alternative designs (meeting electrical requirements with different package or performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (8/20µs)	Power - Peak Pulse	Channels	Package	Status
SRV05-4HTG	Littelfuse Inc.	6V (Max)	15V	10A	150W	4	SOT-23-6	Obsolete
AQRV05-4HTG	Littelfuse Inc.	6V (Max)	15V (Typ)	12A	180W	4	SOT-23-6	Active
SRV05-4HTG-D	Littelfuse Inc.	6V (Max)	15V	10A	150W	4	SOT-23-6	Active
SRV05-4.TCT	UMW	5V (Max)	20V	3A	60W	4	SOT-23-6	Active
USBLC6-4SC6	STMicroelectronics	5.25V	17V	5A	-	4	SOT-23-6	Active
DVIULC6-4SC6	STMicroelectronics	5V	17V	5A	80W	4	SOT-23-6	Active
HDMIULC6-4SC6Y	STMicroelectronics	5V	17V	5A	-	4	SOT-23-6L	Active
NUP2201MR6T1G	onsemi	5V (Max)	20V	8A	500W	2	6-TSOP	Active
NUP4106DR2G	onsemi	3.3V	15V	25A	500W	4	8-SOIC	Active
PE1805C4A6_R1_00001	Panjit International Inc.	5V (Max)	20V	5A	-	4	SOT-23-6	Active
RCLAMP0504N.TCT	Semtech Corporation	5V (Max)	17.5V	12A	300W	4	6-UDFN	Active

Engineering Selection Recommendations

Tier 1 - Direct Functional Equivalents (Recommended Primary Substitutes):

AQRV05-4HTG and SRV05-4HTG-D are the preferred substitutes. Both are manufactured by Littelfuse Inc. and maintain identical electrical specifications to the obsolete SRV05-4HTG. AQRV05-4HTG offers enhanced performance with 12A peak pulse current versus 10A, providing additional margin. SRV05-4HTG-D is an exact electrical match with identical 10A rating. Both parts are Active status, ROHS3 compliant, and available in SOT-23-6 packaging. AQRV05-4HTG includes automotive qualification (AEC-Q101) and extended operating temperature to 150°C, suitable for demanding applications. SRV05-4HTG-D maintains the original -40°C to 125°C range with Ethernet application focus.

Tier 2 - Compatible Alternatives (Voltage/Current Trade-offs):

USBLC6-4SC6, DVIULC6-4SC6, and HDMIULC6-4SC6Y (STMicroelectronics) maintain 4-channel steering configuration in SOT-23-6 packaging with lower reverse standoff voltage (5V to 5.25V) and higher clamping voltage (17V). These parts accept lower peak pulse current (5A) but are suitable for lower-current protection circuits. HDMIULC6-4SC6Y includes automotive qualification (AEC-Q101).

PE1805C4A6_R1_00001 (Panjit International Inc.) provides 4-channel protection with 5V standoff and 20V clamping in SOT-23-6 packaging. Operating temperature extends to 150°C.

Tier 3 - Package Alternatives (Different Form Factors):

RCLAMP0504N.TCT (Semtech Corporation) offers 12A peak pulse current in 6-UDFN package with 5V standoff and 17.5V clamping. Suitable for space-constrained designs requiring higher current handling.

NUP2201MR6T1G (onsemi) provides 8A current in 6-TSOP package but features only 2 channels, limiting application scope.

NUP4106DR2G (onsemi) in 8-SOIC package offers 25A peak pulse current with 4 channels but operates at 3.3V standoff voltage, requiring circuit redesign.

Compliance Status:

All substitute parts are ROHS3 compliant and carry MSL Rating 1 (Unlimited). Parts with AEC-Q101 qualification (AQRV05-4HTG, HDMIULC6-4SC6Y) are suitable for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can AQRV05-4HTG directly replace SRV05-4HTG without circuit modification?

A: Yes. AQRV05-4HTG maintains identical reverse standoff voltage (6V Max) and clamping voltage (15V) specifications. The 12A peak pulse current rating exceeds the original 10A requirement, providing additional protection margin. Both parts are Littelfuse Inc. products in SOT-23-6 packaging with identical pinout.

Q: What is the difference between SRV05-4HTG-D and AQRV05-4HTG?

A: SRV05-4HTG-D is an exact electrical match to the obsolete SRV05-4HTG with 10A peak pulse current. AQRV05-4HTG provides enhanced performance with 12A peak pulse current and extended operating temperature to 150°C. AQRV05-4HTG includes automotive qualification (AEC-Q101), while SRV05-4HTG-D does not. Both are suitable direct replacements; AQRV05-4HTG is preferred for demanding or automotive applications.

Q: Can STMicroelectronics USBLC6-4SC6 replace SRV05-4HTG?

A: USBLC6-4SC6 is electrically compatible but with trade-offs. It maintains 4-channel steering configuration and SOT-23-6 packaging. However, reverse standoff voltage is lower (5.25V vs. 6V), clamping voltage is higher (17V vs. 15V), and peak pulse current is lower (5A vs. 10A). Substitution is acceptable only in applications where lower current protection is sufficient and the higher clamping voltage does not exceed circuit tolerances.

Q: What packaging options are available for SRV05-4HTG substitutes?

A: Primary substitutes maintain SOT-23-6 packaging (AQRV05-4HTG, SRV05-4HTG-D, USBLC6-4SC6, DVIULC6-4SC6, PE1805C4A6_R1_00001). HDMIULC6-4SC6Y uses SOT-23-6L variant. Alternative packages include 6-UDFN (RCLAMP0504N.TCT), 6-TSOP (NUP2201MR6T1G), and 8-SOIC (NUP4106DR2G). Package selection depends on PCB layout constraints and thermal requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. MSL Rating is 1 (Unlimited) for all parts, indicating no moisture sensitivity restrictions during storage or handling.

Q: Which substitute offers the best performance upgrade?

A: AQRV05-4HTG provides the optimal performance upgrade, maintaining identical electrical specifications while offering 20% higher peak pulse current (12A vs. 10A), extended operating temperature range (-40°C to 150°C vs. -40°C to 125°C), and automotive qualification (AEC-Q101). It is the direct successor to the obsolete SRV05-4HTG.

Q: Can NUP4106DR2G replace SRV05-4HTG despite different package?

A: NUP4106DR2G is not recommended as a direct replacement. While it provides 4-channel protection and higher peak pulse current (25A), the 3.3V reverse standoff voltage is significantly lower than the required 6V, requiring circuit redesign. The 8-SOIC package is also substantially larger than SOT-23-6, affecting PCB layout compatibility.

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