BAL99-7 Equivalent & Substitute Parts

Part Overview

The BAL99-7 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 75 V DC reverse voltage and 300 mA average rectified current in a surface mount SOT-23-3 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The BAL99-7 operates across a junction temperature range of -65°C to 150°C and features fast recovery characteristics with a reverse recovery time of 4 nanoseconds. The part is RoHS non-compliant and carries unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io)	300	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 150	V @ mA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	2.5 @ 75	µA @ V
Capacitance @ Vr, F	2 @ 0, 1MHz	pF @ V, MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-65 to 150	°C
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the BAL99-7 is determined by the following critical parameters:

Voltage Rating: The DC reverse voltage (Vr) must equal or exceed 75 V to maintain circuit protection and reliability margins.

Current Rating: The average rectified current (Io) must equal or exceed 300 mA to handle the design load without thermal stress.

Package Compatibility: All substitutes must use the SOT-23-3 (TO-236-3, SC-59) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Speed Classification: Fast recovery diodes with reverse recovery time ≤ 500 ns are preferred for switching applications; however, small signal diodes with longer recovery times may be acceptable depending on circuit frequency requirements.

Temperature Range: Operating junction temperature range must support the application's thermal environment.

Substitutes are grouped into two categories:

Direct Equivalents: Parts matching all critical parameters (voltage, current, package, speed classification).

Parametric Equivalents: Parts with reduced current ratings or voltage ratings that may require circuit re-evaluation but maintain package and basic functional compatibility.

Parameter Comparison

Parameter	BAL99-7	BAL99-7-F	BAL99,215	BAL99LT1G	CMPD914 TR PBFREE
Manufacturer	Diodes Incorporated	Diodes Incorporated	Nexperia USA Inc.	onsemi	Central Semiconductor Corp
Voltage - DC Reverse (Vr) (Max)	75 V	75 V	70 V	70 V	75 V
Current - Average Rectified (Io)	300 mA	300 mA	215 mA	100 mA	250 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 150 mA	1.25 V @ 150 mA	1.25 V @ 150 mA	1 V @ 50 mA	1 V @ 10 mA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Small Signal ≤ 200mA, Any Speed	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	4 ns	4 ns	4 ns	6 ns	4 ns
Current - Reverse Leakage @ Vr	2.5 µA @ 75 V	2.5 µA @ 75 V	1 µA @ 70 V	2.5 µA @ 70 V	25 nA @ 20 V
Capacitance @ Vr, F	2 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	1.5 pF @ 0V, 1MHz	1.5 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Operating Temperature - Junction	-65°C to 150°C	-65°C to 150°C	Max 150°C	-55°C to 150°C	-65°C to 150°C
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Substitute: BAL99-7-F

The BAL99-7-F is the direct equivalent to the BAL99-7, manufactured by Diodes Incorporated. It maintains identical electrical specifications across all critical parameters: 75 V reverse voltage, 300 mA average rectified current, 4 ns reverse recovery time, and SOT-23-3 package compatibility. The BAL99-7-F is currently active in production and ROHS3 compliant, addressing the RoHS non-compliance status of the original part. This substitute requires no circuit re-evaluation and provides a one-to-one replacement path.

Secondary Substitute: CMPD914 TR PBFREE

The CMPD914 TR PBFREE, manufactured by Central Semiconductor Corp, maintains the 75 V reverse voltage rating and fast recovery speed classification. The current rating is reduced to 250 mA, representing a 16.7% reduction from the BAL99-7 specification. This part is suitable for applications where the design current margin permits operation below 300 mA. The CMPD914 is ROHS3 compliant and currently active. Circuit analysis is required to confirm current margin adequacy.

Tertiary Substitute: BAL99,215

The BAL99,215, manufactured by Nexperia USA Inc., reduces both voltage and current specifications. The reverse voltage is 70 V (5 V reduction) and the current rating is 215 mA (85 mA reduction). This part maintains fast recovery characteristics and is ROHS3 compliant. Substitution requires verification that the application circuit operates within these reduced ratings.

Not Recommended: BAL99LT1G

The BAL99LT1G, manufactured by onsemi, is classified as a small signal diode with current rating of 100 mA. This represents a 66.7% reduction in current capacity relative to the BAL99-7. The speed classification differs from the original part (small signal versus fast recovery). This part is suitable only for low-current signal applications and is not recommended as a general substitute for the BAL99-7 in power rectification circuits.

Frequently Asked Questions (FAQ)

Q: Can the BAL99-7-F be used as a direct replacement for the BAL99-7?

A: Yes. The BAL99-7-F is electrically and mechanically identical to the BAL99-7 across all specified parameters. The primary difference is product status (active versus discontinued) and RoHS compliance. No circuit modifications are required.

Q: What is the significance of the current rating difference between BAL99-7 and CMPD914 TR PBFREE?

A: The CMPD914 is rated for 250 mA average rectified current compared to the BAL99-7's 300 mA. In applications operating near the 300 mA limit, this 50 mA reduction may exceed available design margin. Circuit analysis must confirm that peak and average currents remain within the CMPD914 specification.

Q: Why is the BAL99LT1G not recommended as a substitute?

A: The BAL99LT1G is a small signal diode with 100 mA current rating, representing a 66.7% reduction from the BAL99-7. It is designed for signal-level applications, not power rectification. Use of this part in circuits requiring 300 mA operation will result in thermal failure.

Q: Are all substitute parts available in Tape & Reel packaging?

A: The BAL99-7-F, BAL99,215, BAL99LT1G, and CMPD914 TR PBFREE are all supplied in Tape & Reel (TR) packaging, suitable for automated assembly. The original BAL99-7 was supplied in bulk packaging.

Q: What is the impact of the voltage rating reduction in BAL99,215?

A: The BAL99,215 is rated for 70 V reverse voltage compared to the BAL99-7's 75 V. In circuits with reverse voltage transients or margin requirements, this 5 V reduction may be insufficient. Verify that the application's maximum reverse voltage does not exceed 70 V under all operating and fault conditions.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. The BAL99-7-F, BAL99,215, BAL99LT1G, and CMPD914 TR PBFREE are all ROHS3 compliant. The original BAL99-7 is RoHS non-compliant. Substitution addresses regulatory compliance requirements for new designs and procurement.

Q: What is the difference between fast recovery and small signal speed classifications?

A: Fast recovery diodes are optimized for switching applications with reverse recovery times ≤ 500 ns at currents > 200 mA. Small signal diodes are designed for low-current signal applications with any recovery speed. The BAL99LT1G's small signal classification indicates it is not optimized for the switching performance of the BAL99-7.

Q: Can the BAL99,215 be used in high-frequency switching applications?

A: Yes. The BAL99,215 maintains the fast recovery speed classification (≤ 500 ns) and 4 ns reverse recovery time, identical to the BAL99-7. Frequency performance is not degraded. Current capacity is the limiting factor for this substitute.

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